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PuTTY riot posted:is this the way to go re: learning cw? http://c2.com/morse/ is multi-platform, but i haven't used it enough/long enough to actually retain morse
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Jan 16, 2015 19:20
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I fiddled with it for 10 minutes and it's a little frustrating. I'm sure I just need to keep at it but this is actually a worthwhile endeavor, right? I guess theoretically i could use a encoder or something, but seems like most hams wouldnt like that. idk.
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Jan 16, 2015 20:20
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there are specifically dudes out there that do slow speed CW (for one, it makes reception easier) and you will have tons of them to talk to once you're fluent. you'll get it. be patient, don't set deadline goals, you'll get it when you get it
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Jan 16, 2015 20:21
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after a few hours of loving around with the service manual i fixed the giant swedish made Oltronix 32V/10A power supply it's actually a switching regulator, there's a set of big thyristors that chop up the secondary AC like in a dimmer, followed by a HUGE inductor (it's the size of a can of WD-40) to smooth the DC that goes into some enormous capacitors and some 2N3055 transistors for fine regulation there's also three sets of isolated control power supplies, one for the thyristor control, one for the CV/CC regulation and a third one for lighting the various neon bulbs that indicate power on and the meter ranging, debugging involved a lot of thinking and careful selection of reference points the problem? not the transistors, not the thyristors, not the control circuitry, finally i noticed that probing the feedback node on the control board made the supply go crazy, then i started tracing the feedback path from the output through the pot and onto the PCB at which point it stopped, some rear end in a top hat wired this thing to only run with external feedback on a rear panel connector, no trace of the jumpers to actually connect it to the error amplifier, once i added that jumper it worked immediately. here's a picture from after the repair:  note that it supports 4-wire sensing, not a cheap feature the mechanical dial is broken, a guy at work has one of these and told me a swedish guy ran off with the oltronix spare parts stock and sells NOS units, so might look in to that it's a dual range meter, the neon lamps say which range is selected, 0-8 and 0-40V + 3/12A ranges  rear part of the chassis, big transformer, top left is the active rectifier under a cover, large shielded block is a single inductor, capacitors are fairly clear, top right is 3 pass transistors + driver looks to be a late 60s design based on the PCB and component selection
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Jan 16, 2015 20:51
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that is a tank 4-wire is badass. Good work!
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Jan 16, 2015 20:53
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it's a pretty brutal design, notice the over voltage protection switch, that's another thyristor that kills a 10A fuse if it ever goes over voltage, sure hope it's not used as a battery charger when it trips i should measure the inductor too, it's ridiculously large, of course it has to be to store that kind of energy at 100 Hz gonna need to buy a set of test leads, using 4 meters + scope was pretty useful today but i barely have enough leads and probes so had to improvize things test setup was one dmm on the input caps, one on the output, the hand held with clamps over the final regulator and a set of leads to measure random stuff by sacrificing a little accuracy and noise immunity the HP dmms can apparently do over 300 measurements a second, and over 20 per second in 6 digit mode by reducing the mains hum filter time and turning off the low pass filters, auto ranging is very quick too
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Jan 16, 2015 21:43
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Got my call on Tuesday and spent the morning working PSK31. Kind of amazing 7W was getting me all the way to Europe. Fun stuff.
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Jan 17, 2015 17:57
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 what the hell am I supposed to do with 17 900mhz radio modules, seven GSM/GPRS modems, and 18 8051-based microcontroller boards with 256k sram and 64k eeprom??
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Jan 17, 2015 21:36
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sell them and buy a scope
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Jan 17, 2015 21:47
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atomicthumbs posted:
flex pager decoder that updates a twitter with the contents? (note: this is illegal, do not do)
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Jan 17, 2015 21:56
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send me one or two of each, op
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Jan 17, 2015 22:06
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just transmitted and talked to some dads in homestead 
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Jan 17, 2015 22:09
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lol on utwente you can hear a huge cw pileup on the lower end of 80m
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Jan 17, 2015 22:16
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turned out i only did half the job last night fixing the oltronix supply, testing with the radio as a load it would drop from 14 to 11.5V at full load, pretty awful, 4-wire was even worse after replacing couple of transistors i thought were bad i noticed there was a different way to hook up the positive sense line on the PCB, so i swapped it over now in 4-wire mode it stays within 0.01% from 0 to 10A at 14V, that's a bit better e: just noticed, the current limiter goes to 11 longview fucked around with this message at 12:06 on Jan 18, 2015 |
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Jan 18, 2015 00:09
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Crossbar posted:Got my call on Tuesday and spent the morning working PSK31. Kind of amazing 7W was getting me all the way to Europe. Fun stuff. I'm buying an FT-817 just because "psk means 5 watts is enough". its amazing. ill still have the 735 for yelling on ssb
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Jan 19, 2015 17:52
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Jonny 290 posted:I'm buying an FT-817 just because "psk means 5 watts is enough". its amazing. 5w into crappy antenna got me all the way to South Africa on Sunday. Crazy poo poo.
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Jan 19, 2015 20:37
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is this a thing I can play at w/ my 5 watt uv-5r w/ my vehicle antenna? Hello to all our friends in the VHF world from the K5QE contest team.... K5QE will be operating in the ARRL January VHF Contest and would really appreciate any contacts that we can make during the contest. We will begin normal operation at the beginning of the contest--1PM CST on Saturday the 24th. We will be operating as a Limited Multi-op station this year, using 6M, 2M, 222, and 432. The contest ends at 10PM CST Sunday night. We want / need to make contacts with as many stations as possible that are "fairly close" to us using SSB / CW or FM(see below). We should be able to work you, especially on the lower bands, and need to hear from you. Please call in on 2M on 144.200MHz, 222.100MHz, or on 432.100MHz and we will work you there and on all the other bands that we can. We really appreciate your helping us out with contacts where ever possible. Thanks in advance. This year, in order to help the new FM class, we will look for 2M FM contacts on 146.46MHz simplex at 9PM Central on both Saturday night and Sunday night. FM stations within 100 miles of us should be FB, especially if you have a vertically polarized beam and can point our way. We don't run high power on FM, but we do have a 9el beam way up high, so we can work a long way out there. LATE NIGHT OPERATIONS: On 6M, we will be operating WSJT FSK441 digital meteor scatter on 50.265MHz. We will begin 6M meteor scatter operations at 0100ZSunday = 7:00PM CST Sat Night and will cease FSK operations at 7AM Local time on Sundaymorning. After that time, we will resume normal tropo operations. We have several schedules this time, but as soon as we complete a schedule, we will call CQ K5QE 265 on 50.260MHz, but we will RX on 50.265MHz and we will complete our contacts there. If we are calling CQ towards the NE, we will be on First Sequence. If we are calling towards the West or NW, we will be on Second Sequence. Since we are a Multi-Multi station, we will be looking at the Ping-Jockey reflector whenever we are doing meteor scatter type operations. Due to the ARRL rules, we can not post there. If you are not in the ARRL contest, you can post to the reflector freely. Hence, you can talk to us, but we cannot answer back. Please spot us AND our frequency on the appropriate reflector if you see us--that way, others can find us. On 2M, we will be operating WSJT FSK441 digital meteor scatter on 144.142MHz from 7PM CST CST Sat Night and will cease FSK operations at 7AM Local time on Sundaymorning. After that time, we will resume normal tropo operations. When we operate 2M digital meteor scatter, we will RX on 144.142MHz. We will call CQ K5QE 142 on 144.140MHz, but we will complete our contacts on 144.142MHz. Please call us there. We will be on normal sequence(see above). During Late Night Operations, tropo stations can call in on 432.100MHz or 222.100MHz. We should be able to pick you up there. We will still work you on the other bands, by stopping digital operations for just a short time. We very much want to get you in the log, even if it is late at night. EARLY MORNING OPERATIONS: Especially on 2M and 432, if you are an intermediate range station, please look for us carefully in the early AM hours of Sundaymorning, say from 7AM to 10AM, when we have the best chance of a tropo opening. It is amazing how far you can work during those "magic hours" if you just get a bit of enhancement. Thank you in advance for spending some time to work us in the contest. 73's Marshall K5QE EM31cj
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Jan 24, 2015 21:52
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yes! you can definitely get a few contacts on FM, looks like they are setting up on simplex for just that purpose if you want to get plucky, get that SDR running and check out 144.2 to 144.3 see if you can listen to some SSB guys. there's a weekly SSB net here and I checked in with 3 watts on my vertical (SSB is traditionally horizontally polarized) and guys heard me from Greeley to Colorado Springs, bout an hour either way
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Jan 24, 2015 21:57
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sweet. OFC childe just woke up from her nap but it sounds like they'll be around for a while.
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Jan 24, 2015 22:22
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FT-817 is pro. I've got one in a box somewhere since I haven't done ham stuff in years but I remember making voice contacts 800-900mi away on 20m with 5 W into a crappy whip antenna. what's the yospos-approved baofeng model for ragchewing with racist grandpas on local repeaters?
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Jan 24, 2015 22:22
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UV-5R/R+/RA/RE etc..
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Jan 24, 2015 23:00
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spankmeister posted:UV-5R/R+/RA/RE etc.. they're all pretty much the same, right?
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Jan 24, 2015 23:01
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Dominus Vobiscum posted:they're all pretty much the same, right? yeah get whatever
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Jan 24, 2015 23:21
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http://www.eham.net/reviews/detail/10945 I'd get this one tbh. I think it's the one that doesn't get overloaded as easily
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Jan 24, 2015 23:31
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i test on wed. whats a good way to study these days? im gonna see if i can get all 3 in one try (probably not i'm coming down with a cold)
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Jan 25, 2015 09:45
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quote:I bought this HT for one reason, the UV-B5 Yahoo Users Group discovered that the 1.25M band can be accessed by this model, making it a tri-band HT. The latest version of CHIRP supports opening the range of this radio so that you can program 220 mHz repeater frequencies into the CHIRP table and upload them. i'd love to see some stats as to just how terrible the tx signal across the band is when doing this, since the uv-3r was barely compliant in the bands it was actually loving designed for that said i have a uv-82 and it definitely suits my needs just fine, despite its hilariously clunky programming (use a cable) and the fact that you have to power cycle the loving thing to get it to go memory<->frequency entry it doesn't have the thing my uv-3r had where some random intermod in the 450+ range from taxi cab MDTs would completely obliterate the entire 70cm band so there's that
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Jan 25, 2015 09:52
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Korean Boomhauer posted:i test on wed. whats a good way to study these days? im gonna see if i can get all 3 in one try (probably not i'm coming down with a cold) hamstudy.org
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Jan 25, 2015 13:58
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somebody needs to just get us set up with a method to reflash those baofengs with an entirely new firmware/OS/whatever you know some beard would write one e: ok the firmware is locked but you can *very easily* send the cpu commands externally wow http://www.amateurradio.com/hacking-the-baofeng-uv-3r/ Jonny 290 fucked around with this message at 19:30 on Jan 25, 2015 |
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Jan 25, 2015 19:26
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cool article hit rss on how to cut down on your usb connector acting as an antenna http://www.rtl-sdr.com/reducing-usb-shield-interference-rtl-sdr-dongles/
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Jan 25, 2015 20:14
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is making it look like rear end required or was that just his choice
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Jan 25, 2015 21:50
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i wanna do vhf contesting FM mode simplex i got all the poo poo for that lol, set my 7900r to 5w and use my big antenna, battery powered
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Jan 25, 2015 21:58
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Sniep posted:i wanna do vhf contesting FM mode simplex same 
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Jan 25, 2015 22:03
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drat. i guess i cant, i need to go bald and get fat first, also buy a truck and i have none of these thigns
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Jan 25, 2015 22:06
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dude the VHF/UHF hilltopper guys are crazy i love it  
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Jan 25, 2015 22:34
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these all start spinning and then the van takes off, right?
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Jan 25, 2015 22:41
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dude hits the push to talk switch and eighteen-wheelers ahead of him just veer off the road into a ditch as their drivers' eyes boil from RF obv these are not used in motion
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Jan 25, 2015 22:43
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some of the hilltopper guys don't run antenna rotators and just fix their beams facing forward, to rotate they just find a big field on top of a hill and drive in circles slowly till the guy in the back gets a signal
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Jan 25, 2015 22:44
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hey honey, I was thinking about putting another antenna on the suburban...
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Jan 26, 2015 01:30
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Jonny 290 posted:some of the hilltopper guys don't run antenna rotators and just fix their beams facing forward, to rotate they just find a big field on top of a hill and drive in circles slowly till the guy in the back gets a signal 'what got me into the hobby? well, i like driving slowly in circles and being told what to do, and i loving adore getting weird looks from every human being who sees my car, so' just wait until they see my 2m mobile EME rig
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Jan 26, 2015 05:23
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http://www.ebay.co.uk/itm/100KHz-1-...=item27e5f82a3c someone tell me why i shouldn't buy this quote:this item is 100KHz-1GHz full band RTL.SDR Receiver Kit.
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Jan 26, 2015 22:30
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