What's the Point of This Shit Hobby Exactly? EditionOld thread hospitalized with RF burns: >>2564229Eternal thread theme: https://www.youtube.com/watch?v=7gd43b_ZcuU>New to /ham/? Read this shit!http://www.arrl.org/what-is-ham-radiohttps://www.fcc.gov/wireless/bureau-divisions/mobility-division/amateur-radio-service>Your search engine of choice works well too!The FAQ is now back:https://wiki.cybsec.io/index.php/HamFAQ>NEW FAQ is updated to preview 13https://files.catbox.moe/3xr6gh.htm>I can only find Preview 13 prepackaged with some other documents:https://files.catbox.moe/4ghken.zip>The wiki is down but is archived: https://archive.is/PjR5s>Idiot's Guide to Coax Cablehttps://www.pcs-electronics.com/guide_coax.php>Looking for frequencies to monitor near you?http://www.radioreference.com>Basic Rx loop fundamentalshttps://www.w8ji.com/magnetic_receiving_loops.htm>DIY SWL Mag. Loophttp://www.kr1st.com/swlloop.htm>Small Tx Loophttp://webclass.org/k5ijb/antennas/Small-magnetic-loops.htm>In Depth Loop articleshttp://www.kk5jy.net/magloop/>Homebrew RF Circuitshttps://www.qsl.net/va3iul/Homebrew_RF_Circuit_Design_Ideas/Homebrew_RF_Circuit_Design_Ideas.htm>NEW Libraryhttps://mega.nz/file/UCgEGAjb#rwNcnMAQCUUbSp8supsFvn9QEHCWUW86eLcZa16ZG4Y>Online Practice Tests:http://aa9pw.com/https://hamstudy.org/https://hamexam.org/> Real-Time Propagation Datahttp://prop.kc2g.com/>Space Weatherhttps://www.swpc.noaa.gov/communities/radio-communications>WSJT-X 2.1 User Guidehttps://physics.princeton.edu/pulsar/k1jt/wsjtx-doc/wsjtx-main-2.1.2.html>Homosexual (ft8) guidehttps://www.g4ifb.com/FT8_Hinson_tips_for_HF_DXers.pdf>APRShttp://www.aprs.org/>how do I into Morse code in a good way?https://pastebin.com/HByjfN4F
>>2576037let me tell you about my diaper...
How to make radar?
>>2576054>get speed ticket>pay cop in gold bars>say you'll accept his radar pistol as changeIt's probably in the FAQ somewhere.
I'm trying to listen to an air traffic control tower and other airport freqs on kiwisdr, the receiver is located about ten miles away. I can't hear anything, noise if I turn squelch off but other than that no talking at any time of day, even when flights are departing. I can listen to AM radio like the radio in my car picks up just fine. Is there a difference between that and the frequencies airports use?
>>2576135Yes, car AM is MW and airband is VHF. VHF depends on line-of-sight and may be blocked entirely by buildings and hills on the ten miles.Also, what antenna are you using?
why would you people want to listen to this shit
What's a good ssb sw receiver I can listen to cuban music on while camping?
>>2576148Thank you, I've been trying to figure out the difference. I have no idea what antenna the guy operating the kiwiSDR is using, I'm accessing it through the website. The receiver only goes up to 30mhz, so I think the issue is that it can't pick up VHF.
>>2576203Some tecsun. Theres some russian and belarus ones but uhh, good luck buying one. Mahalit and i forget the other.
Belrig radio https://belrig.by/belka%20dx
Why do radios have intercept? I understand why they have slope but shouldnt y intercept always be 0?
>>2576211>The receiver only goes up to 30mhz, so I think the issue is that it can't pick up VHF.
>>2576211AM, FM, USB, LSB, are modes of transmission, the way the information (voice) is modulated.HF, VHF, UHF are band ranges, 300KHz-3MHz is LF, 3-30MHz is HF, 30-300 MHz is VHF, 300MHz-2GHz is UHV etc.on a usual radio SW is for shortwave, it's the broadcast name for HF :https://en.wikipedia.org/wiki/Shortwave_bandsand the modulation is usually AMFM is for 87-108MHz, so it's VHFfor aviation, the AM band is 108-144MHz (or something like that) and modulation is AM so it's AM on VHF
>>2576235I don't understand what this tells me, I'm not interested in transmitting on anything, only playing with this web based SDR and eventually setting up my own with a more capable receiver to listen to other frequencies, though I'm not inquiring about that.>>2576240I see, thank you for the explanation
>>2576244you welcome, anonOn antennas : they depend on what frequency they work on, the directivity (you want to receive everything around or just in a particular direction) and the bandwidth, the difference between higher and lower frequency it can work on, also power they can transmitAntennas aren't influenced by the modeSo for a HF SDR a large bandwidth omnidirectional antenna is desirableusually they are active antennas with a rectangle of metal directly connected to a small large bandwidth amplifier that receive the electrical field of the electromagnetic wave because they act as capacitors.https://a43.veron.nl/projecten/active-antenna/
>>2576054Any guides?
>>2576250For my setup, I want to listen to local fire/ems on narrowband FM. The RPS1A is what I plan on using (1khz-2ghz) so that should work, I was planning on first trying it with my vhf/uhf TV antenna since it's already up on my roof, will this be sufficient?
>>2576289>will this be sufficient?absolutely, for receiving it's ok to have an antenna vaguely compatible with the band you want to receive and more importantly, with a large bandwidth.I receive airband with a HAM antenna made for HAM VHF : 144-148 MHzit even receives ADSB (1090MHz from memory) well too kek
>What's the Point of This Shit Hobby Exactly?Absolutely none for me, I only do audio electronics. I hate everything wireless with a burning passion.
>>2576288Yes. Look in the archives, a Youtube video was posted.
Another LW antenna downhttps://twitter.com/IberiaDX/status/1633140790091194369
>>2576298>>>/diy/ohm/
>>2576037whys nobody feld hell?It's my favorite mode but it doesnt seem anyone uses it and nobody ever replies to my calls
>>2576321I answer calls if I hear them, but they're also rare in Yuropoor.Check Feld Hell Club activities or the Contest Calendar.
>>2576329I'm in rural Croatia. All I hear is PSK31 and cw.
>>2576332Can you get on 80m?
Nobody actually answered, even though it's not a trivial and the answer can't be googled. I'm noob and can figure that by myself.Lets say there are two engineering teams with equal RF capabilities and knowledge, and you come to them with your 2.4 GHz device and tell them to design a directional patch antennas for maximum range L. Will they come up with the same antenna size and shape because there is an optimum solution?
>>2576358>I'm noob and can figure that by myselfSo why do you ask ?
>>2576361"I cannot answer", typo obviously.
The Chad repeater
>>2576313they have two lw transmitters the more powerful one is still on
Brb, not paying thousands in antenna costs to make DX contacts.
Are there VHF UHF talkies that have multiple sets of memories such that I could set up sets of memories for different locations I got to?I'm done being a baofeng poorfag.
>>2576358>>2574930
>>2576667I don't think so, maybe you can prepare multiple sets of memories in CHIRP and load it before you go ?
>>2576667Yaesu FT5D.
>>2576727Not that anon, it is quite expensive but that kind of memory bank can be useful, thank you
hello,I'm giving interest to watch the 0-2000Hz band at home with an antenna.the situation:My building is 12 meter long, There is a 3phase cable running hooked to all buildings of the street and feeding them.I face dirty noise at nights, like wobbling at low freq. and aggressive vibration feelings.I know I shouldn't install antenna inside a building to catch good waves.I think this 3 phase cable, unshielded, may act as an RX for radio pollutionRecording with an antenna seems a good solution to catch view of potential asslesAm I wrong on my theory ?what would be the best antenna to craft or buy for this unorthodox purpose ?A simple copper of 48mm2 parallel to that grid cable ?
>>2576815Hello anon, you really want to do VLF ?That cable will fuck that up anyway, all the appliances connected to it will inject some crap, the linky too
>>2576667opengd77 does this, dunno if the stock radios do this as well
>>2576831>Hello anon, you really want to do VLF ?Hello, It's some kind of VLF tracing yeah>That cable will fuck that up anyway, all the appliances connected to it will inject some crap, the linky too>the linky tooInteresting fact you pointed the L10N source of potential problems. Le dirty french electricity.How to be sure about my own line quality ? I need a tool to plug in outlets and watch its quality.I'd be please to see some craft mixing high pass filter and picrel to have a view on the grid's signal.concerning the power quality hitting the SDR and the antenna: both are connected to a Trendnet POE Switch, connected to a Legrand UPS, connected behind some HPI differential switcher, then 2 Low Pass Filters + a surge protector. And then the linky shit.I let my antenna indoor especially to focus on observing, learning and understanding EMI.A submarine radio officer told me some on the havoc this PLC was for him.
>>2576815Ethernet, LED power supplies, inverters for solar panels and powerline modems are all major sources of noise. You might want to experiment on VLF away from urban areas and using battery power.
>>2577042true, I have accumulated a good amount of university labs' studies on the subject. It's somehow a nightmare, and above all are electric cars sockets.
>>2576936Never heard of it. Do you have to put this on the gd 77 radio?its impossible to find new without scalping prices.
>>2576332Can you get on 80m, Croatian Hell anon?
Anyone manage to flash SI5351's? 'They' will flash them for you at purchase (probably in the thousands+ of units) but they don't offer a DIY solution, so it's soft-program in RAM by microcontrol after every reset. At $3 a pop once hard-programmed, plus a $1 solar light, they make the perfect combo for evening-time peace when dealing with carrier throwers, but adding a microcontroller to reprogram it after every reset drives the cost up 5x.>>2576321There's always JS8. It toggles between 20m/40m. There's some weird groups that use 80m and 11m. I like JS8 because it keeps track of 'known' stations and you can add notes to callsigns which helps me remember people.>>2576815Miniwhip or ferrite wound coil? Would really be good to join a group. Even receiving the ~150khz stuff is tricky. Good chunk of what I hear below 500khz is bleedover from someone on another channel (i receive the same digimode message from them at the same time on multiple bands, with the highest SNR in some other band well above 500khz).
>>2577042>You might want to experiment on VLF away from urban areas and using battery power.That feel when you've unplugged enough shit to swap to battery, shut off main breaker and the noise level doesn't change.
Lost interest once I realized it can't radar track squirrels by default. What do?
>When your elmer quits his meds cold turkeyhttps://youtube.com/watch?v=OnInQnddyhI
>FCC giving 15m, 40m, 80m data and phone privileges to techsWE DID IT BOYS.
>>2577464>ssb only for phone>in a narrow as fuck part of the band Enjoy fighting with faggots and boomers, it's going to be more crowded than walmart on black friday.
>>2577302kek it's hell on radio, and all quiet in the neighborhood.>Would really be good to join a groupyou mean a local radio amateur group? maybe. working in communities is always better. different brains, different ideas, knowledges and shares.. But it would need car in my situation.Sometimes it's all clean, then it fills. I see particular patterns passing by. I did test with microwave oven, oven, induction tables and it doesn't raise noises on the display.Some (next post) are really fractal looking, which I understand as normal to experience when dealing with quadratics and orthogonal signals. I'm also thinking, it's more the dB heights of each harmonics that could be of interest in my situation.
>>2576667try harris or thales
>>2577224>Anyone manage to flash SI5351's?I never heard that was possible, source?
>>2577629>>Anyone manage to flash SI5351's?>I never heard that was possible, source?It's in the datasheet. Maybe the field programmer supports it but I'm not spending $500 for their I2C <-> USB adapter.
>>2577701There used to be a development kit for that:https://forums.parallax.com/discussion/170695/p2d2-with-p2-revb-taking-orders/p2If you can find it, you might be able to do it.Ther Si5351 familiy is getting rather old, I am surprised nobody has made a better version with a mcu and a SA612 like part integrated. The bandwidth into the Si5351 is limited and is just enough to get SSB working on HF. A wider BW could enable wider modes.
>>2577502>>Would really be good to join a group>you mean a local radio amateur groupNo, a VLF or whatever group online. I found an eastern australian one but I'm sure there's others. Those guys share reception reports and whatnot I guess based on agreed upon times to transmit. Some of those digimodes are like WSPR but with like a 30 minute transmit time.Personally I would work my way down in frequency gradually and adjust things so I could go lower. 630m 474.200 khz for wspr, 2190m 136khz for wspr, etc..If you look on PSK Reporter you can see the weird frequencies people are using.
Delicious colors.
>>2576329KEK
>>2576667This is exactly what baofengs are made for. Own one for each area you go to.
>>2578196Source?
>CQ CONTEST
>>2578501https://www.youtube.com/watch?v=UBDqPFzDH5g
fucktards make me seethe on qrz
Now that https://qrznow.com/ is gone, what other good news sites remain?
>Ham amateur radio license holderIt's for you Anon.https://boards.greenhouse.io/spacex/jobs/6369168002?gh_jid=6369168002
>>2579606Battle hardened Morse code operators with QRQ on speed dial should start on 200k.
Hello,I've been an SDRfag for the last half decade. I love it, just listening and pulling in signals with home made antennas mostly. I have a large yard out in the middle of nowhere to do this from. Big enough I can build beverage class antennas.But for some reason I want a base station transceiver. I think if I got one, it would motivate me to get my license and get into things like WSPR.Am I completely autistic or does this seem like a decent plan? The newer transceivers can decode on the unit and I wouldn't need a laptop with a dozen outdated programs.
>>2579647is that SDR good Anon ?Don't ask yourself questions if it's useful or not. Do it and you will not regret what you learnt through the coming years.I'm mostly in the same position. I have Kiwi & HackRF1 and I'm going to learn & improve things and have already have a particular goal to fulfill.
The antenna just got 10 feet higher.
>>2579647>The newer transceivers can decode on the unitThey are too expensive, just get anything that does SSB and put the audio and PTT into a raspberry
>>2579921>gotta save for those dragon dildos
>>2579965I am saving for the antennas. I need to go from the 80-40-20-15-10m end fed to a dipole for 80-40 and the Cobweb for 20-17-15-10m I already have but needs a overhaul, changing wires and maybe a new Guanella 1:6 Balun that can handle 200WAlso a Big choke that can handle 500W for a friend with a FD4, when he transmits all the computers in the shack restart kek
>>2579647>But for some reason I want a base station transceiver.Do you want to go B-I-G?
>>2579980Get a real radio if you're going to invest in an antenna farm, 'tardo.
>>2579997I have several, FT-450D, FT-920, FT-900, FT-981...But to do digital modes you don't need much.
>>2579998>tunes up on frequency>CQ CQ
>>2579980>dipole for 80-40 and the Cobweb for 20-17-15-10mI'd get a hexbeam at that point, for up to 40. Then just hang up an 80m end fed or dipole. My buddies sirio 2016 tunes up to 10, cb, 12, 20, and 40 though. Also works better than his dipoles on this frequencies and is pretty broadbanded with the internal tuner.
>>2580083>hexbeamI live in mountains, so a directional antenna isn't worth it, unfortunatelyVertical antennas are very interesting, it seems that they work well, but again, if my angle is too low it will just go into the mountains. I can try a sloper, things like that, there are a lot of things to tinker with
>>2580116Dipoles and cobwebs are directional.
>>2580083The Sirio would receive HF better without the shield connected.>>2580126>Dipoles and cobwebs are directional.Thankfully everything interesting is east/west
10m is stupid busy, like 100 people on each FT8 decode. Here's a few minutes of decode. If I'm off by 5hz on 30m (10mhz), wouldn't I adjust by giving my radio 0.5 PPM adjustment or 5ppm?
>>2580163>off by 5hzWhy isn't GPS diciplined oscillators more common?
>>2580163>100 people on each FT8 decodeIs that what you're actually decoding or just what you see on the graph? My program seems to limit it to 20-30.
>>2580142>The Sirio would receive HF better without the shield connected.It txs on those frequencies as well. Maybe try rotatable dipoles? Mosley has great ones.
>>2580126The cobweb isn't or at least it's negligible ? That's one of the good point of Cobwebb/Cobweb antennas Dipoles yes but I don't have one, the end fed blind spot is against the main hill so no big loss
>>2580165>Why isn't GPS diciplined oscillators more common?I mean.. i have USB GPS so I can bootstrap the clock on my raspberry Pi if I'm in the field without internet. I have a ton of those i2c battery backup clocks tho, so I guess I could do without GPS, but I'm not sure how to GPS discipline it unless I do some weird swapping out of the TXCO>>2580167I mean, I'm getting several pages of decodes, and one page is 34 callsigns. I'd get about +10-20db gain using my narrowband antenna instead of this one, so I'm estimating ~100 decodes on swapover. This is actually a mild day for this month/week. >>2580170>>The Sirio would receive HF better without the shield connected.>It txs on those frequencies as well. Maybe try rotatable dipoles? Mosley has great ones.I'm indoors, but I can somewhat rotate. 11m vert for local, magloop for listening , active magloop for wide listening and wideband 'dipole' for general purpose.On HF I can hit the opposite magnetic pole of the earth as hard as I can hit my nearby neighbors. Strong 11m neighbors miles away with a vert can hit you hard enough to hear on a dummy load.
Few mins later
>>2580179>I'm not sure how to GPS discipline itPPS
>>2580179Why not put your antennas in open air?
I'm building a rocket model and I want to receive a telemetry when it ascends let's say 2000 m up in the skies. In my case telemetry is just a bunch of numbers from different sensors let's say ten times a second, no video stream.How can I do that? Obviously I need a diy solution, a chip or chips which I can solder on my custom flight controller. I need an antenna as well, because obviously I can't put a stick or a rectangle on a rocket hull. Help.
>>2580258LORA or APRS?
>>2580259How did you answer that fast lolI can google those names but it doesn't give me answers I asked...
>>2580260You need something like an APRS module that sends packets on VHF, and you feed it the telemetry data with sensors on the developer board.On the ground, you need an SDR and software to read the VHF packets.
>>2580262No, I need a diy solution. I've searched for APRS modules, they are huge and heavy boxes, while I have a relatively small rocket model. Plus need an antenna on the rocket and as said earlier it can't stick out. On the ground I will make another PCB with a receiver and connect it to my python ground station GUI.Please no black boxes and no SDRs etc, I need only RF MCUs and amplifiers with schematics, which will work in this case.
>>2580274>meine gesicht when he doesn't design ze rocket around ze payload
Do I catch a ft-817nd at half priceor should I pass and get better?
>>2580660>half priceWhat's the catch ?
>>2580661people no longer insterested in these I think.
>>2580661>>2580662I thought the 817 and 818 went out of production after some components went EOL. I don't know which ones that would be, but if it is true, repairs could become a problem.Hopefully a more modern 819 will turn up.
>>2580662>jewish poster
>>2580660It's good, take it.The 817 seems unintuitive, but once you're through the manual everything starts to click.
All the best 73's regards and well wishes to you and your loved ones. God bless, goodnight and farewellz over and out.
>>2580781That poor ruskie last night on 40m who answered the CQ from an american and ,oh dear, the yankee was a net manager and he asked the ruskie to give a report to the whole net and after each contact Yvan repeated desperately all the good he thought of everyone and addressed his best 73s and good luck and good night and best wishes to you and your family friend, but no, there was another texan to give a report too. Laughed my ass off too much to get into the circus.
6th TV antenna attempt for my friend. Patio umbrella stand + masting + beam antenna FTW. 30-40 miles through the mountains and getting everything now. >>2580258k, what's wrong with wifi? ESP32 or whatever. HF digimodes are like 1-8 seconds per bytes.
>>2580258You have a normal scenario that already has a market of products. Assuming your time is free, anything you 'DIY' will cost at least 4x more than existing solutions.
My city's right on the corner of three counties. Is there a way to find relevant frequencies within a radius or something or do I just have to check each county on radio reference and figure out which frequencies are relevant?
>>2580860Hook an SDR up and see what's active. It would be cool to have a program that watched for you and noted frequencies with activity and signal strength over a day period. Some kind of machine learning waterfall interpretor?
WTF, there where HAMs killed during HAM activity at some pointhttp://www.arrl.org/news/the-spratly-islands-dxpedition-gets-wingshttps://en.wikipedia.org/wiki/Amboyna_CayIn 1982, a Singapore yacht operated by the owner and his wife were carrying four German hams on a DXpedition to Amboyna Cay in the Spratlys. The boat was fired upon by Vietnamese forces. Diethelm Mueller, DJ4EI, was hit by an artillery round and fell overboard as the yacht caught fire. The rest of the party drifted for 11 days on debris, but Gero Band, DJ3NG, passed away from thirst the day before the group was rescued by a passing Japanese freighter and taken to Hong Kong. --Thanks to DX0DX DXpedition Public Affairs Leader Jim Linton VK3PC for some of the information
Grounding rod is in about 6ft.
>>2577464source?
>>2581280Just gotta cut the tip.
>>2581280Nice job anon, if the terrain isn't wet all the year, you can add more rods in series with that one, also, as this is HF ground, a solid conductor is far less efficient than a multi wire conductor, the more strands there is the best it is, HF is only travelling on the outer of the conductor (skin effect) so by multiplying wires you add surface
>>2581366One at a time. It was quite the workout pounding through rock.
>>2581387Oh you have more to go, nice
>>2581388Yeah I'm running a separate rod for the antenna mast.
>>2581295>>2581387you should look into how to properly install a ground rod
>>2581556It's properly in, it's 6ft instead of ft but that's up to local code.
>>25815956ft instead of 8ft*
Never thought of cutting them. Doing multiple rods within feet of each other apparently reduces the effectiveness. FWIW. They sell cheap bus bars near the groundrods and you can tie everything together with one.
Just cleaned up my ham area. Got the 706 from a buddy recently, and have a 6pin power cable coming. Should be fun.
>>2582670Nice, next step you'll make a shelf when you'll reach 3 layers of stuffthat VHF-UHF Swr meter is impressive, I need one in UHF but man, 500W, that's something rare.
Just bought pic related on offer on AliExpress and I have no experience of amateur radio. What is the total range of frequency on this? It’s dual band so does that mean it stretches from 30 to 30,000MHz?
>>2583084Nice troll post but dual band just means 2m/70cm.
Newbie here. I just ordered a President Electronics McKinley radio and a PE Montana Up antenna for my vehicle. I can’t really find any information on the antenna however it is the longest magnetic mount antenna PE sells, does anyone know if this antenna will be satisfactory? I’m open to buying another antenna but it has to be magnetic mount.
What's the absolute best kind of ham radio antenna for multi-band work in the HF bands? Bonus points for antennas that are under $1,000 and require minimal space and/or can be roof mounted.
Suppose I want to have a common source RF amplifier but instead of a resistor on the drain I have an inductor.What's the best way to bias the gate? Usually I'd use self biasing but with the inductor I can't do that.
>>2583231>Montana UpIt's a bit short, you can try a President MLA-145, it's a 5/8 lambdahttps://president-electronics.com/Antennas/Magnetic/MLA-145
>>2583242>absolute best kindI like your way of thinking.
>>2583231I use a McKinley export with a Maryland antenna and have perfect SWR under all weather conditions, so probably.My antenna isn't magnetic, however. I bolted on a Wilson 610 stud after my magnet mount got BTFO by a tree branch.
>>2581280Thou need https://www.amazon.de/Bosch-Pro-Erdnageleintreiber-SDS-max-16/dp/B001419BNG/ to push it like in butter.I sealed 6m of copper rod into the ground with this.
>>2583538That's what I used.
>>2583251Isn't BIAS just the DC portion? Couldn't you just use caps/inductors to block DC or AC?You can size a cap to act like a AC resistor also.
>trying to listen to shortwave>there's an eletrical substation about 100 yards from my house>There's a 1000w am tower 1200 feet in the other directionEvery shortwave band has hip hop in the background, on any band. It's all pervasive biggie over everything.
>>2584130fuck... Well, you might be able to get something with a very very steep filter that cuts the AM broadcast station frequency
>>2576235
>>2579647just got my first sdr(or any form of radio at all) it's a trl-sdr v3. i set it up today and istalled sdr sharp. i managed to listen to normal radio stations and it felt pretty amasing. what should i do next? what else can i recive and what steps should i take in reciving those more interesting signals?
OH MY LORD LADS I JUST HEARD A PLANE. I HEARD A PLANE FROM MY DORM WITH A LITTLE CHEAP SDR I JUST GOT. I AM EXTAZIC! I LOVE THIS NOW
>>2584279Welcome in the rabbit hole anon. Now with another SDR you get ADSB and not only do you listen to aircrafts and ATC but you also see where and who they are like you are the ATC
>>2584283i have a question anon. why can i hear music from fm radio stations on way higher radio requencies?
>>2584254How about weather satellite images? Check https://www.rtl-sdr.com/ for ideas.https://www.rtl-sdr.com/tag/satellite-2/
>>2584289image frequencies (mirror frequencies ? Sorry I don't know how it's named in english), the level of FM stations si so high they cause "duplicates" in the receiver, if yo udon't plan on listening to these, you can buy a FM filter that will lower the level of things between 87-108MHz so it doesn't pollute other bands
what would i need to do to be able to hear local police radio with my sdr?
>>2584302Go over to radioreference and look up your area. If FM then you need nothing else. If it is a trunked system then 2 or more sdr dongles are needed. Checkout sdrtrunk.You're probably dealing with a trunked system and will be able to listen to dispatch and non-tactical channels. Basically, whatever you hear on a scanner app.
>>2584302Which SDR do you have? The rtl-sdr is not sufficient to pick up nbfm signals, you need something capable of VHF reception to pick them up. I asked about this earlier in the thread. t. tried using kiwiSDR for this purpose, 0-30mhz sdr like rtl-sdr and it didn't work I'm not sure how people pick up airplane traffic on them like >>2584279
>>2584418>I'm not sure how people pick up airplane traffic on themit is in the range of RTL-SDR receiver, 108-140 MHz and it is AM.
>>2584421So it is, not sure why I thought they were 0-30MHz, excuse me speaking on things I know nothing about
>>2584425no problem anon, we are here to learn and share
>>2584418KiwiSDR and RTL-SDR are different and receive different frequency bands.https://www.rtl-sdr.com/about-rtl-sdr/
>>2584138I'm very new at this. I just have a shitty tecsun pl-310 and about 35 feet of cross connect wire from work strung out the window across my yard. I have one of picrel but I don't think I can use it because I don't have a ground.
>>2584602>I don't have a groundyou don't need one to use a filter
>>2584603The end of the wire I just have an alligator clip on, so I can't plug it in normally to the end. Do I just clip it to the outer threads?
>>2584605I see, well you can try to insert it into the female part of the SMA connector or get a SMA male connector (not RP : reverse polarity, it is for wifi) and solder your antenna wire to the center pin and connect it to the filter then run a small coax to the receiver
>>2584606Thanks, I'll try that. I'm thinking of re-running the wire anyway so I may try to make it better- Maybe make it a dipole.
>>2584617a dipole isn't suited for wideband reception, it is centered around a specific frequency and really bad for everything else. You are better with a random length for receiving
>>2584618Oh, well maybe I'll just leave it as is then. I have 24awg cross connect wire strung between a metal awning and my garage about 35', with wood blocks and jute rope to keep it away from the metal. The wire then runs through my window- the whole wire is insulated, but it does technically "touch" my metal siding/window screen/etc My yard is very small, only really 45' by 25' in the back. I have it running from the window northeast to the corner of the shed. At most I could probably run it 70' from the front yard along the entire length of my property. Not sure what other styles of antenna could work though that maybe utilize more area than length.
>>2576657is DX vertical polarity? I tried setting up a long wire horizontally but wasn't picking up shit
>>2584649As soon as it bounces on something there isn't any polarity anymore, especially when it bounces on atmosphere layers
>>2584130you definitely need a filter for AM/FM car radio, that shit is loudeven at -40dB, commercial radio will dwarf some of your signals (but at least it won't overload your receiver)
>>2584650wait what? I thought reflections were inherently polarized
Guys, what is this ?
>>2584418>t. tried using kiwiSDRI sadly read that Kiwi is out of stock. I feel lucky that some Anon here advised me to buy one, and despite the 600€ it costed, I had not hesitated and ordered one without any lag time process. It has since disappeared from the Swiss shop's inventory. I'll never thank Anon enough for his good advice.I went for that antennahttps://hamradioshop.net/antennas/e-field-active-antennas/225/megactiv-ma305ft-active-antennahttp://kiwisdr.com/ks/compare.1.1.pdf
>>2584781>Kiwi is out of stockApparently it won't be made again, for reasons the creator prefer not to go into.The design is a few years old, presumably a new version could be made, with improved dynamic range and supporting more GPS bands. A Chinese clone (they always will exist) upped the design to 16 bits but bad design choices nullified the improved capacity of the ADC.
>>2584875>reasons the creator prefer not to go intohe gave teasers to understand speaking about the semiconductor market since Plandemic, and the problem of counterfeited chips. And his position, a minor actor in terms of volume.Suppose you buy a 1000 batch chips, which reveals being all fake and your business account is all strangled.>The design is a few years oldThe beagleboard itself is very old. It does the job but it seems limited compared to OrangePi & ODroid, rPI.It's a one core 1Mhz ARM cpu. I wonder if it could be easily replacedThe kiwi hat itself is a great tool. And the software intelligence around makes it a great project.
>>2585132>The beagleboard itself is very old. It does the job but it seems limited compared to OrangePi & ODroid, rPI.There are great hopes for RPi-V.>It's a one core 1Mhz ARM cpu. I wonder if it could be easily replacedPeople have already used Beaglebone AI-64, which is fast and works great, though there is a danger if plugged in incorrectly. It has a beefy chip with the new C7xxx DSP but documentation is beyond sparse.>The kiwi hat itself is a great tool. And the software intelligence around makes it a great project.Agreed. And since it works it is sad that it is gone. TangerineSDR has a lot of talk and hot air with little to show for, but it indicates at least what more that could be done with a modernized platform.
Imagine being a ham, hauling all your shit to a top 50 desires dx location, and not knowing how to work said equipment.
explain this shit
>>2585209It's a spark gap. Voltage to ground gets too high and it sparks.
>>2585209in thunderstorm season I place neon lights across the terminals of all my antennas which are disconnected from any radios.when lighting is really active the neon bulbs will flash periodically. this dissipates the charge on the wires.
>>2585209It doesn't eliminate static electricity until it reaches hundreds of volts : it's not useful for taht.But it is a surge protector.To eliminate static electricity that builds up in the antenna, you need to put a coil between antenna and ground.The coil conducts DC : static electricity but blocks AC : RF signal
>>2583360Would the Wilson 1000 be a good enough substitute? It’s the same length and I can order it from Amazon now
>>2585321If you are okay with the price, go for it !
I'm a bored Extra and saw an add to get an FCC Commercial license.Are there any avenues to explore for financial gain with all my ham knowledge going to waste playing an FT8 video game?
>>2585749>I'm a bored ExtraIf you can study hard enough for extra you should know how to do basic research. Also, there's way more to ham radio than fucking data modes, but try something new like slow scan.
>>2585757Ehh, I've been burned too many times to blindly jump into another certificate or training or _______ when it comes to commercial or 'education' without talking to someone who has gone through the process.I do digital and ssb and am making progress on cw, armature radio boils down to (duh) communicating with armatures. Yes, I know about Winlink. In before do contest/dx. I have a DXCC Challenge.Has anyone paired their ham brain with one of these licenses to make a respectable paycheck?
>>2585762What the fuck do you want? Get into telecom or electrical. Or go become an air traffic controller. If you can drill holes, run wire and build antennas (maybe you can't) you should be able to set your mind to anything. Amateur extra is a fairly technical exam, so assuming you actually know what the fuck it involves and didn't just study for the test itself online (or worse, are full of shit) I think you can rub a few brain cells together to figure out what fields ham radio knowledge might bleed into.
>>2585762>I do digital and ssb and am making progress on cwHow the fuck does an amateur extra have such limited experience with amateur radio by the way? I know techs with a month under their belt working all modes + 10m. It sounds like you don't know what you're talking about.
>>2585794>How the fuck does an amateur extra have such limited experience with amateur radioWhat are you talking about? I've done my share of DX and contesting and local stuff, plus Winlink and satellites and APRS.It boils down to armatures talking to armatures regardless of mode.I was thinking of getting into 2m EME, but it's time to re-evaluate. Instead of talking with hams, perhaps there's an avenue to turn the knowledge of the hobby into a paycheck.
>>2585797>I've done my share of DX and contesting and local stuff>plus WinlinkData>satellitesFun when bored>APRSLmfao you're kidding right? It's all data. If you can work wsjt-x and fldigi you can do everything you just mentioned. It's just data, means nothing. It's no different than bragging about working d-star on a ht. Ft8 gets out far and is neat to work, but if all you're doing is working data modes then no shit you're fucking bored. Go to trade school and learn telecom shit. I don't want you being an air traffic controller, might involve something other than data modes.
Are you allowed to talk to pilots if you have a license?
>>2585810>are you allowed to tx within bands allocated to your license privileges Yes>do aircraft radios often have the capability to tx on basically any frequency Yes>can you talk to a pilot legallyIf he's in your band privileges>can you tx on air bands not allocated to hams without special licensingNo
>>2585806Kek. I saw an ad for pic related in a ham magazine and asked if anyone turned their ham hobby to a commercial success, but I've been reduced to a FT-8 retard not worthy of asking that question.
>>2585749 >>2585762There is always military signal service.
>>2585835I really appreciate the idea, but military is off the table at 36.It seems most of the FCC licenses revolve around maritime work. I think I see the flaw in my thinking; the kid behind the counter at the gun store doesn't have an FFL license. The business employing him has the FFL license.As such, few if any at a (radio station | business | first responder communication king | etc.) need FCC related license. They work under the license of the business
>>2585810Some parts of HAM bands are common with what an aircraft can and has the right to transmit on, I got a guy in a KC-135 over Poland once and heard a french pilot who has his own cargo aircraft, it's rare, but can happen
Can't you just put the radio in a car, ride somewhere and call every single pilot over your county a faggot? You don't need a license for that right?
>>2585955FAA isn't like the FCC. They actively monitor and track their bands. Causing a disturbance will release the full force of the FAA and FBI looking at every single traffic cam, government, and business cam available with time logs with FAA real deal triangulation to determine who it was. Then they'll run the plate.>so take the plate off, got itNot so fast. They'll simply check local traffic cams to get an idea of where you live and where you launched from and check dmv records of where your car is registered to. It is somewhat of a slim chance you'll make it out clean. Remember that a guy fucking with uscg from him home got >10 years without any identifying information (outside of what he pulled out of his ass) and was still caught.
>>2585965Bro that's not me in the car.And what if I'm not from the US?
>>2585972>what if I'm not from the US?Then who cares?
>>2581280>>2581295I still use PicSay Editor too. It hasn't been updated in a decade and works better than anything else on the market for what I need. *Tips fedora*
New project antenna, got all the parts just need to do it my next days off.
>>2586149They seem to work well, there's a variant where you use single wire and a Guanella 4:1 balun.I have to change the wire and make a balun that can handle 200W
>>2576037This might be a silly question but is there any way I can listen to ham radio on my phone or at least in general conveniently without a license? I don’t want to talk or anything only listen
>>2586200websdr.org/
>>2586200You can put a RTL-SDR USB receiver on your phone with a OTG USB cable and run some SDR software on it.so you have your phone ---OTG cable--- RTL-SDR USB device ---cable--- antenna
>>2586200And yes listening is permitted in almost all countries on earth.
>>2586174The balun I'm planning on will handle 1k watts without much issue, and the most I'd ever be able to put through it is 600w ssb. More likely 300w honestly. Data I run even less.
Interesting website with HF broadcast antennashttps://www.antenna.be/
>>2586298Bay Area KFS or KPH SDR runs an antenna that looks like that. Works very well. The gain on paper wasn't very high but I think the 'gain' from avoiding ground losses makes up for it.Heh. Looking at their webpage they reference another maritime station called KEK
>>2586149Let us know how it goes, I think a beam will be my next antenna.I've worked a lot of stations with beams and great signals
I bet that cobweb would actually tune 30m inside with the same dimensions.
>>2586256>>2586278>>2586282Is there an iPhone app also?
>>2586365>This app requires an external rtl_tcp server. iOS devices do not currently support the direct connection of USB peripherals such as an RTL-SDR. Nah, you are fucked
>>2584617Update, I did >>2584606 and it works well. I just shoved the xconnect wire into the end of the connector and crimped it. No more hip-hop over everything.
>>2585854>I really appreciate the idea, but military is off the table at 36.I think they prefer them young, yes.https://youtu.be/01ebrNIqfbkThere is still intelligence agencies and SIGINT.
Anything fun I can do with this RTL-SDR? Im running the shitty antenna kit because poorfag atm. I can pick up aircraft, except theres no traffic this time in the morning, so there's fuck all to listen to. For some reason the local EMS is being, I guess rebroadcast on marine channel 2, but other than that, and the random boomer repeater whining about local politics, and NOAA, Im not finding a whole lot to listen to.If I wanted to upgrade to a more effective antenna on the cheap side, what am I lookin for?
>>2586767Make a long wire antenna.
>>2586767>Anything fun I can do with this RTL-SDR? There are absolutely tons and tons of ideas in the blog:https://www.rtl-sdr.com/>If I wanted to upgrade to a more effective antenna on the cheap side, what am I lookin for?A plain copper wire cut to the appropriate length. remember, this is a hobby that can cost as much and as little as you want.
Why has nobody tracked down and beat the fuck out of that "in the desert" nigger on ch19 yet?
I'm just getting into SWL, I live in central Seattle so reception at home has been bad, strung up a long wire in the yard, disappointing results so I've scaled it up steadily adding length height and insulators but am still only getting a few stations and rarely get any strong signals. next step seems to be a magloop, but before I move on, any thoughts on the long wire?
>>2587125hard to see the wire but it's there. strung from window up thru 3 trees then with the slack just thrown over one span to keep everything off the ground. I could trim it off but not sure if that would help?
>>2587128the wire is kept from contacting the trees with Paracord insulators
>>2587050What is the story here? Local drama?>>2587125What kind of receiver do you have? It might be you need a filter.
>>2587132just a portable, tecsun pl880. i was reading about "overloading" the other day. if i was experiencing that, wouldnt i be hearing multiple signals all at once? what i'm hearing is the opposite... mostly noise and probably interference as its fairly densely populated
>>2587125>>2587128don't forget time of day is important.What's the length of your dipole?
>>2587170>dipolesorry, thought the antenna was ghetto ladder line.+/- 35 feet?
>>2587125>>2587128Add a counterpoise.
>>2587174its ~135ft in total i think.
Good sunday. I'm doing tutorials with hackFR one. The FM Radio Signal I recieve is mostly poor. I put the standard telescopic antenna in the hackrf one. Is it useful to connect a bias-tee in between that SDR and the antenna ?I see the main use case it's useful for long length coaxials.Reciever <-- bias tee <-- long coax ---> LNA -- >AntennaJust for knowledge and safety: suppose I reverse the BIAS-Tee, Is there some risk for the HackRF to receive RF+DC in its SMA ?
>>2587536I wrote bullshit and need a LNA.
>>2576153I'm not a shortwavefag but I think 99 percent of the appeal is reliving the old days when shortwave communities were the equivalent of the internet. The only way you'd ever interact and get to know with people across the country, across borders, or across the world. In the year 1990 when the second most advanced piece of technology in your house was a CRT TV, talking to people thousands of miles away with your short wave radio was amazing.
>>2587656>not a shortwavefagWhat does this even mean? You use repeaters and a walkie talkie instead?
>>2587238Should be solid - here's what I see at 10pm in Indiana/KentuckyAt 5 am, Asia blares in.
>>2587835Was a mobile fag and forgot>Each of those lines is another AM station.
>>2587801It means I'm not involved in any part of this hobby at all, and am commenting as an outside observer only. I can't speak from any experience and am just guessing.
Change of plans from the cobweb, I'm going to build a monoband hex.
>>2587656>when shortwave communities were the equivalent of the internetYou will now remember 16-bit PCs and Fidonet via CB.
>>2587536>>2587646The bias-tee is here to provide power supply to the active antenna, as you guessed it, you have a passive antenna so it will do nothing.I don't use my HarckRF anymore, reception is poor, it needs a pre-amplifier.SDRPlay is better on that aspect.A long wire hanging outside should provide you good reception on most of the things you want and awesome reception on everything you don't want
not sure if right thread but can someone explain how pic works? I get the principle behind fmcw but where is the transmitter/receiver antenna here? Is it switching between transmitting and receiving and am I right to assume you can scan a room with that? Wanted to upgrade my dumb robot vacuum with that.
>>2588034forgot link https://www.seeedstudio.com/24GHz-mmWave-Sensor-Human-Static-Presence-Module-Lite-p-5524.html
>>2588034> not sure if right thread but can someone explain how pic works?It's a doppler radar, one side sends signal, the other receives and the frequency difference is measured.> but where is the transmitter/receiver antenna here?Copper rectangular patches.> Is it switching between transmitting and receivingCW in FMCW means continuous wave, so both sides work simultaneously.> am I right to assume you can scan a room with that?Doppler radar measures speed, not distance, so no. You could theoretically integrate, if you are doing a scientific project.
I have a few PRC-77 radios from the military, but I don't know much about radio. They operate from 30-76 mHz with 1-4 watts of power. I understand that there is a Ham band around 50mHz, and I could get a license and use them on there.However I don't want to go through the trouble of getting a license if they don't work. My friend has a Baofeng that can operate around 65+mHz, and I see that that range (65-75) is largely allocated fixed/mobile. If I were to transmit there to test if the radios can receive/transmit at all, what is the likelihood I would be in trouble? Would testing from my basement or something like that prevent me from fucking with other people?
>>2588071Nobody gives a fuck, do what you want.
>>2585749>I'm a bored Extra and saw an add to get an FCC Commercial license.Are there any avenues to explore for financial gain with all my ham knowledge going to waste playing an FT8 video game?Helium or whatever shitcoin LORAWAN is using nowadays. You get paid for digital spotting/relay of a few bytes instead of doing it for free like us monitor schmucks on pskreporter.I make enough and providing good signal reports gives me a boner so I'm a bitch to pskreporter tho. Latest gen PC crunching all this shit and I can't even watch porn anymore without the vid stuttering. FML.
>>2587656>I'm not a shortwavefag but I think 99 percent of the appeal is reliving the old days when shortwave communities were the equivalent of the internet.For HF the 'machine' is big enough to reasonably be worked on by a human. Find community where you can.
>>2576037Finally got all parts together, the OP picture will be rebuilt on an experimental board to fit in a tin can.
>>2588071>>2588072 thisIt's hard to triangulate a signal without knowing the general location of it's origin. If you just transmit a couple times to test nobody is going to care and probably won't even hear you, it isn't like there's as many people on HAM bands as the internet.
>>2583084Okay I've now received it. How do I know what to tune to? Shall I just scan around and see what I pick up?
