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Jonny 290 posted:i dont even know on HF any more. i have barely heard a thing in days and though slow cw is fun, i have no more interest in yelling into a mic over and over to "really light copy OM cant quite make you out" 
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Jul 27, 2015 23:32
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| # ? Jun 8, 2024 11:00 |
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its because i cant get my antennas high enough. or in the case of the vert, lay down 900 radials. or both. fewer things are sadder than a 40m dipole at 20 feet off the ground esp when peopel are all "lol we unrolled a g5rv on the lawn and worked a guy in europe"
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Jul 27, 2015 23:38
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im hoping ill have better luck on digital than i did on ssb phone. if i can get this wiring figured out and get all the parts i need. babbys first schematic and all that. plus rdp from the living room would mean way more airtime
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Jul 27, 2015 23:46
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oh to answer your earlier, if you dont have optocouplers in stock (i do lol), just use vox note that the rear panel wont trigger vox gotta use the front panel mic in
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Jul 27, 2015 23:56
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agggggg i dont have a spare connector for the front, lol. i guess i should just follow that schematic and do it the right way
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Jul 28, 2015 00:04
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you can skip the transformers and the opto, really. but you need to use a transistor instead of the optoisolator because you need to invert the signal (+5 on the left side needs to pull the right side to ground)
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Jul 28, 2015 00:07
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Sup radio thread, I've been monitoring the local repeaters on my UV5R for about a year on and off, loving around receiving SSTV, doin thangs with an RTLSDR dongle, etc. I notice when I'm driving with a longer antenna on the UV5R in the cupholder I get what I guess is frequency wobble because the speaker keeps cutting on and off like someones tapping their transmit button. Is this because of the antenna wobblin'?
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Jul 28, 2015 00:57
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sounds more like QRM to me. have you done this yet? made a big diff for me http://www.miklor.com/COM/UV_Squelch.php
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Jul 28, 2015 01:02
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loving with cw settings and txing awful morse code to see if anyone else is even on this band. The 718 has an option to use the channel up/down keys on the mic to run the internal keyer.  Edit: my SWR on 12 meters is right around 2:1 so I can kinda tx on there too. brand engager fucked around with this message at 02:24 on Jul 28, 2015 |
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Jul 28, 2015 02:07
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add about a foot to the antenna and it'll probably resonate right on 12
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Jul 28, 2015 02:25
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 i just need to figure out how to make these things quiet. i wonder if i coudl replace the fan w/ just a regular quiet pc case fan or if it would know. these are the ones there's a detailed write up for a 12-14.2(ish) voltage adjustment pot. this is what im using w/ my 735 currently
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Jul 28, 2015 02:39
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Jonny 290 posted:i dont even know on HF any more. i have barely heard a thing in days and though slow cw is fun, i have no more interest in yelling into a mic over and over to "really light copy OM cant quite make you out" lol if you're not running 1500w AM through your beverage array for your nightly ragchew sessions on the top band atomicthumbs fucked around with this message at 02:49 on Jul 28, 2015 |
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Jul 28, 2015 02:45
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longview posted:the issue with tuning coax fed antennas is that the loss in the coax gets multiplied due to the standing waves (or put another way, the signal travelling back and forth through the coax until it comes out at the antenna with the right phase/amplitude). suddenly i understand impedance mismatches
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Jul 28, 2015 02:46
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atomicthumbs posted:lol if you're not running 1500w AM through your beverage array for your nightly ragchew sessions on the top band foursquares. beverages are for rx. top band assholes have foursquare arrays for TX, four 1/4 wave verticals (yes four 133 foot towers) spaced 1/4 wave apart, phase em up. but yeah
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Jul 28, 2015 02:53
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Jonny 290 posted:foursquares. beverages are for rx. top band assholes have foursquare arrays for TX, four 1/4 wave verticals (yes four 133 foot towers) spaced 1/4 wave apart, phase em up. wikipedia says you can use a beverage array for transmitting and that it's a traveling wave antenna instead of a resonant antenna, so instead of being a long monopole the signal flies off the end of the wire and gives it good directionality?? weird  it's basically just a completely lossy transmission line
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Jul 28, 2015 02:56
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PuTTY riot posted:
I need a pair of those hp ones for a charge station
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Jul 28, 2015 02:57
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right but people in practice use finite length beverages with terminating resistors at the far end and L M A O if you think the dudes that take up 70 acres just for 120 ground radials are gonna waste power in a /resistor/
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Jul 28, 2015 02:57
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why have 120 ground radials when u can have 120 beverages? *rotates deafening 120-position antenna switch rapidly*
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Jul 28, 2015 03:00
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atomicthumbs posted:?? weird Welcome to rf where everything is loving magic
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Jul 28, 2015 03:14
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http://www.ebay.com/itm/221706973853 should i buy this thing so i can use acc1 instead of the front mic connector? ive got the el cheapo usb serial i can do ptt with.
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Jul 28, 2015 03:44
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that's....actually a good deal yes do that the transfomers are a couple bucks each and hard to find
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Jul 28, 2015 04:28
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done and done. just happened to pull up sat tracking website, iss overhead, ran out opened squelch up and heard their lil APRS guy. i dont have a digipeater or anything set up but its still cool to walk outside and pick a freq and sit there and wait and then hear it come out of nothingness just to disappear back into it a few minutes later. u got me thinking about sat stuff now. coworker who is a ham but isn't really active said hes gonna bring me abuncha old 'coax and connectors'. idk. maybe there will be something i can use to make a 2m or dual band yagi out of.
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Jul 28, 2015 04:33
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I've finally caught up with this thread. It's a great resource and it's given me a lot of ideas on projects and what not. My current "equipment" is a hackrf and a god dang marine VHF antenna(not grounded, i dont have to, right?) bolted to the top of a basketball hoop. the tip of this antenna is maybe.... 16-18ft off the ground. I would like to expand my listening capabilities beyond listening to emergency services and decoding pocsag. My setup cannot seem to receive ham stuff ~146 mhz nor the ~400's stuff either it's disappointing because thats what the drat antenna is made for. I presume my antennas just not high up enough in the air. So, I want to buy this bad boy and put it on like 10-20ft of black steel pipe, with a flange or something to bolt it to where my current antenna is. Is this a hilariously terrible idea? Would I need to ground it? I also am really interested in listening to the stuff around 120m to 49m like those huge high power shortwave stations. I'm able to pick up /some/ of them if i shove the center pin of my uhf connector into the ground of my houses electrical wiring (i know this is a terrible idea and I only did it long enough to see that it worked) These fall outside of the range of that discone and there doesn't seem to be an easy option for receiving these bands. Am I looking for something like this? one of these long wire dipoles however, that exact one doesn't go up high enough. Would I need multiple antennas for the shortwave stuff im interested in? (i have an up converter for my receiver, but by default it goes down to <1mhz anyway if you play w/ the firmware) I did infact spend some time researching these questions, but it gets wordy and technical very quick and I'm really rather new to this stuff and don't want to make a bad purchase. Thanks!
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Jul 28, 2015 05:32
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are you in the US? country helps with shopping suggestions. The discone is a fine idea but to be honest Diamonds are...expensive. it's a good antenna but really, i would suggest just lookign at a dual band ham antenna. For RX they have fine coverage 144-174 and 420-500 or so, they'll cover the public service bands just fine. high SWR doesn't matter on receive really. Long wires are good idea for HF, really it's a good start to just throw a literal long rear end single wire up and feed it through a window to the center pin. For more advanced listening you may want to put a little tuner or preselector in front of it, especially if you find AM broadcast trashing everything. a wire with length somewhere in the 60-80 foot range would probably work well for what you're wanting to grab
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Jul 28, 2015 06:47
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Jonny 290 posted:that's....actually a good deal yes do that those transformers are common as gently caress, but yeah, ~$6 each if you buy new. i've got a pile of them in my junk box, safely contained in their modem shaped packaging http://www.digikey.com/product-detail/en/TTC-105/MT4134-ND/285701 , mouser has a better selection
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Jul 28, 2015 07:35
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Jonny 290 posted:are you in the US? country helps with shopping suggestions. Yeah, I'm in the US. I figured that the diamond was a bit overkill because, about 60%+ of its resonant frequency(?) isn't particularly interesting to me. I figured it would be cool incase I decided I wanted to do something else, but after some reading it's apparently very inefficient effort/money wise to get "the perfect antenna for everything". I actually have 50 ft of uhf cable that I bought by accident. I'll try throwing it up in a tree and see what i get. I figure if it's not enough I can rip it open and take out one of the conductors and combine them, then cut it down to size. Could you possibly recommend a tuner/preselector/filter for the shortwave stuff? My sdr makes a lot of distortion on it's own and I have trouble enough dealing with it's gross oscillator noise(? aliasing? idk what this is. maybe i blew up the front end amplifier, which is frightingly common w/ this particular sdr) example of the noise/distortion i see a lot the peak of that thing in the center is like -45db i dont get it its not like im amplifying things up to -5db or something. Once again, thanks for all your help! edit: to clarify, nothing in that picture is a real signal, that "shape" just shows up randomly throughout what im sampling. I'm not sure if i blew up the opamp or not because i still get lots of things like that when i turn it off, albeit noticeably less of them Incomplete Fish fucked around with this message at 08:19 on Jul 28, 2015 |
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Jul 28, 2015 08:14
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Incomplete Fish posted:I actually have 50 ft of uhf cable that I bought by accident. I'll try throwing it up in a tree and see what i get. I figure if it's not enough I can rip it open and take out one of the conductors and combine them, then cut it down to size. Rather than ruin your UHF cable, I'd recommend buying a 100ft spool of wire like http://www.amazon.com/gp/aw/d/B00FG...qI4L&ref=plSrch
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Jul 28, 2015 13:35
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Pham Nuwen posted:movers brought my poo poo today, time to see how lovely the 2m scene is and whether or not I can hang a dipole in my back yard without breaking my neck. bought a bag of 10 of these for $7:  i'll probably try to hillbilly something up using these and paracord because I have paracord on hand.
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Jul 28, 2015 19:48
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the only wires of mine that aren't hung with 550 are the ones that i threw up using scraps of clothesline cause i didnt care lol it does tend to snag a bit on bark though
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Jul 28, 2015 21:52
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i used the finest hexuple knitted 6mm polyester silk rope for my antenna 800 kg maximum load with 450 kg strength conductors, it's massively overkill so i kind of had to put in the spring to provide some relief that thing's gonna stay there until i retire, mark my words
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Jul 28, 2015 22:22
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paracord from walmart is working alright so far for me. sometimes i wonder if we get a big windstorm what's gonna break first, the pvc cap, the eye bolt bolted into that, the 14 gauge thhn, pvc conduit insulators, or the paracord. or my eave mount/eave itself. lol. probably not the paracord...
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Jul 28, 2015 22:31
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i wonder if there's rope with a braided copper core you could use for antenna
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Jul 28, 2015 23:09
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atomicthumbs posted:i wonder if there's rope with a braided copper core you could use for antenna copper is too soft for antenna wire it would stretch and paracord wouldnt help
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Jul 28, 2015 23:27
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 agg ill never need 4 of these but if i do im gonna ragret not getting 4
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Jul 29, 2015 00:12
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im really weird and hem and haw about $2
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Jul 29, 2015 00:13
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what happens if you say "breaker breaker one niner whats your 20, over"
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Jul 29, 2015 00:23
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Beast of Bourbon posted:what happens if you say "breaker breaker one niner whats your 20, over" the FCC dfs u and then they hang you
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Jul 29, 2015 00:24
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from a crank up antenna mast
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Jul 29, 2015 00:25
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Beast of Bourbon posted:what happens if you say "breaker breaker one niner whats your 20, over" nothing if i'm on the CB most likely you would get no response if you called that on a ham band again, remember, ham radio is not the internet and trolling on it is exceeeeeeedingly stupid because a: nobody will bite and b: if they track you down it is a five digit fine and they pull your license if you have one
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Jul 29, 2015 00:36
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can i broadcast pics of my dick over sstv?
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Jul 29, 2015 00:38
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