Activity Stream

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 I had a really good one a few years ago but I realise it's well out of date.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

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

Hi. Building my first QRP radio and almost finished- hope to test tonight. However I’m 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...

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. https://www.youtube.com/watch?v=z10ISekkOQs

Hi, Trying out the waves again. Stopped back in '96. It will be interesting to see how things have changed. KE6MHP

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...

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!

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

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

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...

Hi, When programming Handy with CHIRP, is it transmitting when red LED flashes Camerart

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. https://www.youtube.com/watch?v=Vwjcn4Vl2iw&t=636s EDIT: "The way things used to be done" is almost worthy of its own section on the forum!