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Yeah, it's an enormous hobby that you can have fun at (or frustration) at any budget up to literal million dollar stations that old retired boomer engineers have spent their sixties building on a huge kansas farm definite money pit hobby, spend carefully
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Jun 15, 2014 04:37
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Jonny 290 posted:against my better judgement i looked into "no ground plane" antennas cause fiberglass body RV i feel like youll get 70 pF of parasitics from various bullshit between that antenna and your radio 
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Jun 15, 2014 14:28
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haha, 100% possible. the skin on this thing is indeed fiberglass, but it does have an aluminum box frame. very possible that it could interact with that some ChamS: yeah ive decided, i think i'm going to dust off the IC-475a and put it up for sale/trade on qrz.com today. 706's are going for ~600 in good shape there and I bet I could squeeze $400-450 out of this thing
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Jun 15, 2014 18:54
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2m Slimjim antenna ripped off from here. total cost $23.32 Still need to get some coax for it, and waiting on a SWR meter so I can tune it.
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Jun 15, 2014 23:33
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that's a really weird design with that folded top conductor. i'm curious to hear how well it works
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Jun 15, 2014 23:43
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 hamradio.jpg
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Jun 16, 2014 00:15
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Bloody posted:
i mean SK
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Jun 16, 2014 07:19
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Jonny 290 posted:that's a really weird design with that folded top conductor. i'm curious to hear how well it works The twinlead version works well, the open air version should be decent...
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Jun 16, 2014 07:24
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Low-Pass Filter posted:2m Slimjim antenna ripped off from here. i wish i had time to do smth like this. maybe when summer is over
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Jul 1, 2014 01:22
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Bloody posted:
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Jul 1, 2014 01:51
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PuTTY riot posted:i wish i had time to do smth like this. maybe when summer is over is it really almost all 70cm there or would you find use for a 2m antenna
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Jul 1, 2014 02:02
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turns out the 2m rig was broke. it got fixed then a power supply died. my charger was hidden in a box for a couple weeks so I've been out of the loop on what's going on. missed field day too 
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Jul 1, 2014 02:05
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how do i find a place to get tested for ham-aids
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Jul 1, 2014 04:35
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http://www.arrl.org/find-an-amateur-radio-license-exam-session
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Jul 1, 2014 04:43
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cjs: hausbus is becoming antenna-festooned up front on the driver's side we have a 102" cb whip on a ball/spring, and on the passenger side i got my HF vertical mounted. I can set it to ~8 feet for 10 meter operation on the go, or extend it to 18' for down to 20 meter action when we're parked. I mounted up front because that's where the radios will be, and at first I will not have a tuner at the antenna, so I wanted to keep coax losses to a minimum. I'll install a ground radial system around the perimeter, and ground them both to the frame rails - there are crossmembers just a few inches from each. On the back corner I have the wifi AP mounted; ubiquiti nanostation on a 4-8 foot extending paint pole. Found some nifty clamps and bolted it right to the ladder - looks neat and works great. Really gets above the trees/rooftops when it's extended. Got the Icom 208 and the CB power wired up too. To do: install two dual-band antennas (need to order the mount for one), run coax, bolt up radios.
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Jul 6, 2014 00:39
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Jonny 290 posted:the rockies are a hotbed of microwave ham activity because mountaintops so i'm going to get in with those dudes 
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Jul 6, 2014 04:25
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i bought a bladeRF to have some fun this summer, turns out it's not all that great on Windows yet, USB 3 barely works and unplugging it while it's running has a 50% chance of bluescreening the system, so i had to install a linux the linux aside, it's pretty good hardware, using gnuradio-companion makes prototyping RF fairly easy, like this 70cm -> 23cm FM repeater  osmocom Source is a receiver block on the blade, I can sample receive up to around 30 MHz without issues, the band-pass filter selects the coarse RX frequency, and it's mixed down to baseband. with a direct conversion receiver it's best to tune slightly off to avoid any DC bump at 0 Hz. Signal Source + Multiplier implements a mixer, the low pass filter also does downsampling to 48 kHz, and the FM demodulator makes an audio signal. In this case I use a wide-band FM transmitter for fidelity, and the baseband FM signal is upsampled, mixed to the tx-offset frequency and passed to the TX module. TX signals can be up to 28 MHz wide, so it's possible to transmit ATSC or DVB-T signals with this software stack. most likely the WFM modulator isn't working all that great since the deviation is larger than the nyquist frequency of the 48 kHz signals it's set to generate, there's also a levels issue I haven't worked out because the documentation tends to be pretty vague Another thing you can do is sample and demodulate the entire european 70cm band, process and retransmit all of them on 70cm at the same time, one of the examples I found transmits NFM, WFM, AM, LSB, USB, CW and PSK31 at the same time
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Jul 6, 2014 09:04
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breaker one nine we got the cb wired up it was behind teh dash and nonfunctional when we got the bus, i fixed it up. its one of these:  pretty cool. no s-meter but who cares its a gd cb
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Jul 6, 2014 23:58
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Jonny 290 posted:breaker one nine we got the cb wired up holy poo poo that cable that's like some milspec poo poo
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Jul 7, 2014 00:10
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yah big like 16-pin screw lock connector check the service manual for --vintage fontz --pcb's obviously laid out by hand --list of every chip in the thing http://cbtricks.com/radios/cobra/67ltd/graphics/cobra_67ltd_sm_pg01_15.pdf
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Jul 7, 2014 00:13
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i got a directional coupler in the mail, and built an antenna analyzer with the bladeRF: that's the return loss of my semi-rigid 23cm GP antenna after tuning, VSWR at 1270 is 1:1.1, better than 1:1.5 across most of the usable part of the band
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Jul 9, 2014 17:29
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Crs: there's a radio nerd exam in like a week and a half near work so I'm gonna go and fail my technician and/or wind up with an extra 
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Jul 12, 2014 04:13
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Bloody posted:Crs: there's a radio nerd exam in like a week and a half near work so I'm gonna go and fail my technician and/or wind up with an extra hope you at least read through the question pools first since A) they are available and B) they have a lot of "answer isn't what you'd think, purely arbitrary" questions that you just gotta cram to pass
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Jul 12, 2014 06:46
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ya i hamstudied them all
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Jul 12, 2014 14:45
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Bloody posted:ya i hamstudied them all u got dis
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Jul 12, 2014 17:51
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is it ever ok to tx music? say, someone singing happy birthday?
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Jul 12, 2014 17:52
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only if its to the ISS for some reason
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Jul 12, 2014 17:58
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Jul 12, 2014 18:08
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Bloody posted:only if its to the ISS for some reason i wonder what event took place that prompted them to change the rules
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Jul 12, 2014 18:10
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spankmeister posted:i wonder what event took place that prompted them to change the rules i know its a big thing to play wake-up songs on the shuttle and ISS so maybe they didnt want to piss off the FCC if they were operating and the iss PA started blaring smells like teen spirit or whatever
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Jul 12, 2014 19:20
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bump
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Jul 20, 2014 01:52
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thanks  radio stuff is on standby as we are obviously having the busiest month/week of our lives right now getting to CO
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Jul 20, 2014 02:17
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Jonny 290 posted:radio stuff is on standby as we are obviously having the busiest month/week of our lives right now getting to CO whens full departure?
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Jul 20, 2014 02:47
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thursday if we're on the ball, friday if we're not work starts the 28th i'd like to have a day of recovery
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Jul 20, 2014 03:02
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Jonny 290 posted:thursday if we're on the ball, friday if we're not https://www.youtube.com/watch?v=ZFo8-JqzSCM Go jonny go.
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Jul 20, 2014 07:19
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how do i do antenna testing? i have the tiny SRH805S antenna for my baofeng now and i wnat to test the power of it it receives and transmits to the local 70cm repeater fine, the 2m repeater in the next town over doesn't seem to be working because i can't get a response from it even with my RH771 e: also i finally got a programming cable after the ebay one i ordered months ago never showed up, i just got one from dx spankmeister fucked around with this message at 08:29 on Jul 20, 2014 |
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Jul 20, 2014 08:26
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ham_radio.jpg:
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Jul 20, 2014 08:34
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Jonny 290 posted:thursday if we're on the ball, friday if we're not nice definitely a day of recovery
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Jul 20, 2014 09:21
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Jonny 290 posted:thursday if we're on the ball, friday if we're not Go jonny go
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Jul 20, 2014 13:14
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| # ? May 12, 2024 13:41 |
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spankmeister posted:how do i do antenna testing? use an antenna range  
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Jul 20, 2014 16:32
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