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Bloody posted:that site has a surprising number of fuckin terrible cabins considering cabin porn should be really easy (eg take a picture of any cabin) seriously look @ this poo poo i hope hipsters don't get into ham radio
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Mar 11, 2014 04:44
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| # ? May 13, 2024 09:13 |
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PuTTY riot posted:i hope hipsters don't get into ham radio i'm surprised they haven't the most analog form of communication found this vintage HF set at a thrift store bespoke hand crafted antennas from found objects
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Mar 11, 2014 04:55
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also noaa recently upgraded their noaaport to dvb-s2 so you can throw up that C-Band antenna and get a solid 3+ mbits of nonstop weather data all day erry day
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Mar 11, 2014 05:02
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PuTTY riot posted:i hope hipsters don't get into ham radio they have they're called QRPers
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Mar 11, 2014 13:28
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whats a qrper
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Mar 11, 2014 15:21
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Bloody posted:whats a qrper qrp is a morse code abbreviation that means reduce power, qrp guys use low power transmitters. <10W for voice <5W for morse
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Mar 11, 2014 16:06
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Jimmy Carter posted:also noaa recently upgraded their noaaport to dvb-s2 so you can throw up that C-Band antenna and get a solid 3+ mbits of nonstop weather data all day erry day holy poo poo this is rad, thanks i had no idea they were on that level
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Mar 11, 2014 17:29
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Dijkstra posted:they have they're called QRPers lol pops had a C band in the yard when i was a lil kid before he had a Bunch Of Kids. it was pretty dope we'd throw balls in the dish and catch them when the fell.
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Mar 11, 2014 18:55
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Crankit posted:qrp is a morse code abbreviation that means reduce power, qrp guys use low power transmitters. <10W for voice <5W for morse that sounds cool, guess im a hipster
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Mar 11, 2014 19:12
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just built my mini-whip antenna today (took like four hours) first impressions: I need to re-bias the thing since I used different parts, but over all it does work, it seems to pick up less noise than the radios built in whip and also less than the loop antenna I built mine differently than the reference, putting actual RF transformers (wideband 50/50 ohm) at both the antenna and inside the power supply, then I run the power on a stereo audio cable using the L/R as power and the shield grounded to power return and coax shield at the power supply also added several common-mode inductors to suppress power supply noise
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Mar 11, 2014 20:36
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that being said, looks like I still need to add a series resistor to the antenna element, those JFET gates are ridiculously easy to break
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Mar 11, 2014 20:57
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yeah watch that fet input for sure. Maybe the old 1n914's set as a clipper on the input? idk if they'd gently caress the signal any. very cool on the build! did you just wind some toroids? i need to get a bunch of cores for transformers and baluns but i always get lost down the Mouser catalog hole and get bored
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Mar 11, 2014 20:59
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I think any kind of diode on the gate will destroy the signal due to the capacitive effect of the diode, the element is about 1-10 pF and adding a several pF diode to ground or VCC is probably a bad idea I'll probably just add a 100k-1M resistor, the input is high impedance so shouldn't matter except for the increase in thermal noise nah, I have a reel full of mini-circuits RF transformers (15kHz-~1000MHz) in my office, for the chokes I had wurth 744220s lying around I'll post pictures tomorrow when I've fixed it
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Mar 11, 2014 21:06
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actually, the source of the gate is at the same potential as the gate (source follower configuration), adding a low capacitance diode from the gate to the source should result in a net zero added capacitance
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Mar 11, 2014 21:11
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my roommate in college once did an eme bounce on something stupid like 3 watts. shits crazy
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Mar 12, 2014 02:25
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fukken ULS 
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Mar 12, 2014 04:12
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pumped that there's no covenants or HOAs where i wanna buy.
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Mar 12, 2014 04:14
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here you go, my idiot tiny antenna: i made this PCB wayyy to big for the parts, whip (chassis) connects at the left, output to the balun on the right of note: pro as gently caress 1210 package capacitors soldered to the ground plane acting as solder turrets for the power distribution ground for the antenna is connected to the mounting bracket  i cut a piece of ~RG-316~ to the same length as the stereo audio cable I use for power, the PSU box also has a 3,5mm jack RF output to interface with scrub tier receivers like the Tecsun PL-660 (actually pretty good)  the power box is just some line filters and another balun, nothing special
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Mar 12, 2014 15:30
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that is really great, well done! im inspired now. on a similar note i've never done an MMIC amplifier and i've had ideas about building a uhf+ discone (bottom end about 400 mhz maybe?) and preamping it. mmic's appear to be stupid easy to use
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Mar 12, 2014 15:55
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just did a comparison with the sony an-lp1 loop, it gives out a stronger signal but has worse SNR than this mounted in a non-ideal spot but with good grounding if you want to go all out, power the preamp through the coax and use a relay to disconnect the amp, that way you could transmit on the same antenna i might do that for my discone actually... but I'd need a much more broad band amplifier (25-1700 MHz) in fact, i'll check what parts might be suitable tomorrow, a nice broad-band IC with a few dB gain would be very nice to have
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Mar 12, 2014 16:05
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Anyonw have good recs for a 1GHz antenna? I want to receive airplane transponders better.
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Mar 12, 2014 16:06
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http://www.sprut.de/electronic/pic/projekte/adsb/adsb_en.html try this one, it's really easy to build if you have some stiff wire around and I've had good experience with collinear antenna designs assuming the lengths are correct i forgot to mention i also put a poly-fuse in the power box, in case of shorts (had several due to the horrible design of the 3,5mm jack chassis connectors)
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Mar 12, 2014 16:13
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weekend 290projects: -<boring house cleanup poo poo that's not radio related> -take pics of the radio case. I built a shelf in it that sits right above the radios, it will be a good place to put SWR meters and a laptop and misc small crap. can still pull the radios out, too. Then I stripped a few feet of RG-8 coax and used the braid for a ground bus for everything, soldered a little ground pigtail in place for each radio. added a terminal strip for power distribution and got all that wired up. It's got a 120v strip in it but I want to add a little 200-300w inverter to the 12v side, so that I have laptop and other misc power when running off 12v. other than cutting a couple pieces of foam to put on top of the radios when it's packed up, that's done. -Modify that lindenblad antenna, i'm going to route the coax outside the bottom element as per the PDF file and try it that way -plan out next solder-y project. longview's got me inspired. if i had a hundo to throw at it, i'd buy a raspberry pi, another sdr stick and an hf upconverter, and put all those and a miniwhip in a chunk of PVC and power it via PoE. hang that sumbitch 50 feet up in that oak tree. i wonder if i can toggle the hf upconverter via a GPIO pin on the pi. it'd be dope to do a miniwhip for HF and a separate MMIC active antenna for vhf/uhf
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Mar 12, 2014 17:18
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just get two dongles, less work than fiddling with pin diodes or coax relays
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Mar 12, 2014 17:33
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also you want the pi in a box on the ground, unless you feel like shielding the power supplies (12V->5V module for example), pi board and the sdr dongles it's very sensitive to electric fields so probably want to shield things regardless of distance if you're using it outside where there's nothing attenuating the noise sources
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Mar 12, 2014 17:38
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i am suddenly feeling wholly inadequate with my currently in shipping SDR dongle
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Mar 12, 2014 17:45
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longview posted:just get two dongles, less work than fiddling with pin diodes or coax relays yeah you're right and good points on the shielding. i'd want this to be an all in one kind of thing, plug in the ethernet and go, so I definitely would want to lean towards getting the brains part shielded up.
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Mar 12, 2014 17:51
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i think my sdr dongle on the slowboat took less time than getting my drat ticket jesus
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Mar 12, 2014 17:51
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here's a 5 minute project for the lazy ham: tripod HT antenna mount  only issue i had is first go i got solder all over the threads
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Mar 12, 2014 17:55
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that is loving adorable i love it
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Mar 12, 2014 18:00
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longview posted:here's a 5 minute project for the lazy ham: tripod HT antenna mount lol
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Mar 12, 2014 18:10
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http://www.ti.com/product/ths9001 im gonna try using this thing for my active discone, should be able to fit inside a tiny box possibly inside the discone mounting tube if i build it right challenging part will be building a 1 GHz bias-tee from discretes, but oh well, needs must
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Mar 12, 2014 19:44
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awww gently caress yes i got my ticket
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Mar 12, 2014 20:46
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woooooo congratuations! your callsign is way way more morse-friendly than mien. proud of u sir
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Mar 12, 2014 21:01
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i wanna know what your callsigns are but i understand the whole 'lol real name and address' aspect but still if it contains anything awesome u must post it like if its khailsatan or someth
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Mar 12, 2014 21:05
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Jonny's is in the "other" ham thread 
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Mar 12, 2014 21:09
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there's only one zip code for my city, and im the newest license. if ur good u should be able to figure it out
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Mar 12, 2014 21:16
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you should be talking on the repeater 'bout your diabetes or upcoming operation instead of posting here
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Mar 12, 2014 21:22
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im about to go take a smoke break and do just that but there prob won't be anyone listening.
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Mar 12, 2014 21:23
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| # ? May 13, 2024 09:13 |
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oooh you're buying a house you will have NO END of poo poo to gripe about actually, bringing that in, please keep me posted as to your house status and if/when you move. I may have a little something to send as housewarming
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Mar 12, 2014 21:24
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