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  • M3EVF's Avatar
    Today, 10:01
    M3EVF started a thread UK CodePlugs in Bands & Modes
    Does anyone have or know the location of, a comprehensive UK DMR Codeplug for the Retevis RT3? There's a TYT radio that is identical I believe. I had a really good one a few years ago but I realise it's well out of date. Thanks
    0 replies | 45 view(s)
  • OK1RP's Avatar
    Yesterday, 09:38
    Hi folks, I am looking for some upgrading parts for my O2. - high-end RX366 sureceiver for 566/565 + filters - LDG internal ATU model OT-11P for 565/566 (TT internal ATU model AT566K is also possible) - optional 250Hz Inrad roofing filter model 353 (300Hz TT model 2002 filter is also possible) for 566 - optional Model 310 external fan unit
    0 replies | 68 view(s)
  • 5B4AJB's Avatar
    Sun 18th Aug 2019, 12:47
    Well, it won't have quite the same value but you may be able to tweak it with spacing the windings or adjusting the capacitance. Go get some more 28 guage, it will eliminate issues when final tuning...
    1 replies | 61 view(s)
  • Flint's Avatar
    Sat 17th Aug 2019, 21:49
    Hi. Building my first QRP radio and almost finished- hope to test tonight. However Iím winding the final coil that calls for 14 wraps of 28 ga wire, but I just ran out and only have 30 ga. Will using the 30 ga wire have an adverse affect on my radio? Thanks...
    1 replies | 61 view(s)
  • Rich A's Avatar
    Sat 17th Aug 2019, 13:58
    Rich A replied to a thread Ten-Tec Delta in Ten-Tec
    Hi, I've got a Ten Tec Argonaut II which is the QRP version of the Delta. Here is a link to the Ten Tec manual archives for that rig. Ten Tec combined the Argo and Delta manuals originally. Don't know if you found the info yet, if not try this: 73, Rich WA1TRY
    1 replies | 764 view(s)
  • OH8GAD's Avatar
    Sat 17th Aug 2019, 13:04
    OH8GAD replied to a thread Round 2. in Introduce yourself
    Welcome back. Hope you're too disappointed... ;)
    1 replies | 91 view(s)
  • sdrmatlab's Avatar
    Fri 16th Aug 2019, 18:41
    Here folks i have made a complex iq files and streamed the iq data to a vector signal generator. sdr# processed the data. we have images in the RF spectrum and some funny NBFM radio transmissions as well. enjoy and thanks for watching.
    0 replies | 52 view(s)
  • esa's Avatar
    Fri 16th Aug 2019, 13:53
    esa started a thread Round 2. in Introduce yourself
    Hi, Trying out the waves again. Stopped back in '96. It will be interesting to see how things have changed. KE6MHP
    1 replies | 91 view(s)
  • Obed's Avatar
    Thu 15th Aug 2019, 11:18
    Obed replied to a thread New Ham and Member in Introduce yourself
    welcome to the hobby and the forum. The FT was a fine radio in it's day.
    1 replies | 173 view(s)
  • rwilabee's Avatar
    Wed 14th Aug 2019, 22:20
    I'm just getting in to DMR. I have set up in the radio software Digital Contacts, RX groups, Channels and Zones. If I go to one of my contacts on the radio should I hear any chatter if someone is talking or is there something else I need to do. I'm going to be working through a Hot Spot that I set up. I set my hot spot to a simplex freq on my radio. The hot spots says listening after I press transmit but I don't hear any chatter if I go to various contacts. I have contacts like Texas 3148, North America 3, Tri-State 8, and some others. I uploaded the codeplug to the radio and then I go to contacts I see the names and can choose one but I just don't hear anything. Is there anything else I should be doing or can't you listen in like with a repeater. My radio is a small GD-73 chinese radio and my Hot Spot is a MMDVM Hotspot Spot Radio Station Wifi Digital Voice Modem P25 DMR Hotspot Support YSF Raspberry Pie OLED Antenna. I can connect to my hotspot with no problem using my web browser so I'm...
    0 replies | 93 view(s)
  • BFX's Avatar
    Wed 14th Aug 2019, 16:33
    Just posting for the first time to say hello. I look forward to learning from all of you. Right now I have a Baofeng UV-82 that I was gifted by my Elmer upon passing my Tech. I have just added a Negoya 771 that improves the performance noticeably. I have my father's FT-101Z in storage that I will get out in the next several months. It may need someone to look it over before I fire it up. It has not been powered on for several years. Cheers!
    1 replies | 173 view(s)
  • brandon lind's Avatar
    Wed 14th Aug 2019, 14:16
    As soon as you add a second antenna (assuming it looks nothing like a CB antenna), people automatically assume ham. There is the possibility of using the same antenna, but there are serious complications to consider. Obviously, you cannot key up with 25 watts directly connected to the FM stereo antenna input without ruining both radios, but the frequencies might be far enough away from each other that a diplexer could be built to separate the signals - but be ready to do some serious work to get it right without lots of loss or smoke. Either a sleeved coupled resonator antenna or trap antenna could easily do all 3 bands, but the traps in the latter would still be a dead giveaway. If you were parked rather than driving, a slot antenna designed into a headache rack might work, but the directivity is that of a dipole.
    2 replies | 136 view(s)
  • 2E0FVL's Avatar
    Wed 14th Aug 2019, 07:36
    Only had time for a quick look but maybe this will help:
    2 replies | 136 view(s)
  • Steven's Avatar
    Tue 13th Aug 2019, 23:31
    Wondering if someone can direct me to source of an incognito mobile antenna that looks like an ordinary pickup truck antenna. I plan to add a mobile to my pickup but just don't want a mag mount or other obviously HAM antenna. I'd really like to add a similar to the FM radio antenna that is on the passenger side to the drivers side of my truck and I think that would be reasonably in conspicuous. Surly someone else has wanted to do the same thing. I have scoured the internet and have yet to find anything close. A base loaded whip that ins't too long would be fine. Any ideas? Thanks Steven
    2 replies | 136 view(s)
  • bluejaws's Avatar
    Mon 12th Aug 2019, 12:32
    I'm looking into running a longwire with an antenna tuner for my 100W HF station and I'm a bit confused whether I need to also use a balun with the tuner. I'd like to keep the rf out of the shack. Shack is in the basement. Coax feedline running up to the longwire that begins near the top of my chimney. Plan to use a counterpoise as well. Any help/suggestions greatly appreciated. Dave
    0 replies | 107 view(s)
  • brandon lind's Avatar
    Mon 12th Aug 2019, 00:27
    Update: The multiple avalanche transistor idea failed. Adding the extra circuits added length to the traces and slowed the rise time too much. Slower rise time, fewer harmonics. I have not got around to making a high enough voltage source to do as KB4AJB suggested with the spring, but I can't wait to try it! I will hopefully get to it within the week. Anyhow, although not perfectly flat across the screen, here is how a single 2N3904 avalanching transistor (rebuilt with shorter leads) did as a noise source. Analyzer in averaging mode... The board is a boost converter to make 120v out of 12v, the avalanche transistor is in the PL259 barrel on the BNC tee
    5 replies | 269 view(s)
  • K7KBN's Avatar
    Sat 10th Aug 2019, 23:58
    You might want to replace aluminum wire with equal size copper or tinned copper. If you have to solder any connections, you'll be really unhappy with aluminum. And as Bandon said, make it a bit longer than you think it should be.
    2 replies | 146 view(s)
  • neltek's Avatar
    Sat 10th Aug 2019, 23:52
    Have a look at this page: He lists the BF programming stuff for Kenwood
    9 replies | 15240 view(s)
  • Redbicycle's Avatar
    Sat 10th Aug 2019, 22:49
    This is what I have been using. I use it mounted on a painter pole and a homemade wooden mount that I either stake down with guys or drive my truck onto. I just picked this up at a radio day to try but have not used yet.
    2 replies | 212 view(s)
  • brandon lind's Avatar
    Sat 10th Aug 2019, 19:32
    I found this picture on google. It looks like 10 turns. Length, diameter and number of turns all play a role in determining a coils inductance. A coil is used to introduce inductive reactance to an antenna that exhibits capacitive reactance (usually from the antenna being electrically shorter than any given odd multiple of quarter wavelengths) such that they cancel out leaving just a resistive component - while at the same time both are made such that the remaining purely resistive portion of the impedance matches the feed line. I would go with a bit more coil as you think is needed so you have room to remove some in the tuning process.
    2 replies | 146 view(s)
  • M0WAO's Avatar
    Sat 10th Aug 2019, 18:23
    what about a fish pole with some wire and a balun as a the prowhip was when not in use you can take it down not to upset the community
    2 replies | 212 view(s)
  • M0WAO's Avatar
    Sat 10th Aug 2019, 18:05
    nice one, enjoyed it :friendly_wink:
    3 replies | 192 view(s)
  • skynext's Avatar
    Sat 10th Aug 2019, 14:26
    Hello, I am currently finishing the build of a portable UHF two elements cubical quad. I modeled the antenna and the simulation shows that it should have a 90 ohm feed point impedance. I used Jerry Sevick dual-stage design of a 50 to 90 ohm balun. (a trifilar unun followed by a 4:1 guanella balun) Now, The balun enclosure and the radiating elements are not close one to another (mainly to improve mechanical / center of gravity specs of the antenna), so there will be some balanced transmission line from the balun up to the radiating element. The easy choice would have been to use some 100 ohm differential pair or better yet, some 100 ohm twinax. The problem is that twinax sockets and coax are quite expensive. whereas 100 ohm differential pair nowadays seems to be mostly used for data and low power signals, and i don't think using a RJ45 socket for more than a few watts PEP would be good engineering. And its UHF, so balanced terminals should be made carefully because in terms of wavelength even small...
    0 replies | 83 view(s)
  • gilow's Avatar
    Sat 10th Aug 2019, 01:56
    gilow replied to a thread DIY Marine HF Whip in Antennas
    Sorry for the delayed response, I thought I had answered but I cannot see it yet. I am new so my posts need to be moderated first. I am not sure if that is the sort of thing because the diagram is a bit confusing. There appears to be a wire from the top of the antenna to ground?
    3 replies | 172 view(s)
  • 5B4AJB's Avatar
    Fri 9th Aug 2019, 09:53
    He's not a patch on Irving Finkel :D
    3 replies | 192 view(s)
  • camerart's Avatar
    Fri 9th Aug 2019, 09:52
    Hi, When programming Handy with CHIRP, is it transmitting when red LED flashes Camerart
    0 replies | 160 view(s)
  • 2E0FVL's Avatar
    Fri 9th Aug 2019, 08:13
    2E0FVL replied to a thread DMR Radios in Amateur Radios
    I would have a good look at the way DMR works if you can prior to buying the kit. Hardly any simplex use (if any) all works via repeaters and or through a computer/hotspot. So if your within range hand held could be all you need.
    1 replies | 143 view(s)
  • OH8GAD's Avatar
    Fri 9th Aug 2019, 07:28
    Oh wow, I had forgotten about those. As a kid, I used to watch the Royal Institute Christmas Lectures. If I remember correctly, they were shown on TV during the school summer holidays on BBC2. As for re-tuning crystals: remove the metal casing and a little bit of pencil lead (OK, graphite) would knock it down a few kHz.
    3 replies | 192 view(s)
  • brandon lind's Avatar
    Fri 9th Aug 2019, 06:27
    I never cease to be amazed when I watch videos from the old days before technology made things easy for the every day person. I've seen videos for changing a crystals frequency by sanding them or putting them in acid, I've seen wavelength and tuning measurements with a lecher line and a neon bulb, I've seen single conductor transmission lines that have less loss than coax or twin lead, and now I believe I've seen it all... An optical lens made of glass focusing RF energy! This particular video starts out very boring to the average wire nut, but the second half is an excellent demonstration of reflection, refraction, diffraction, and standing waves. Just thought I would share the link for those interested. EDIT: "The way things used to be done" is almost worthy of its own section on the forum!
    3 replies | 192 view(s)
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