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I haven't gotten around to it but I was thinking of changing the hang time by adjusting the 100k and 47uf cap on the 2n7000 gate. The hang is about right with a 100mf instead of 47mf but that is just

For anyone using this scheme: I recall someone encountering distortion due to something in the Rx before this point. I had the thought (that still remains): why not 'feed-forward' like AM AGC? My

Ok, so it also has a resistor and a couple of caps. Anyway, here it is: http://www.w1hkj.com/FldigiHelp-3.21/html/w5zit_rt_channel_page.html While wsjtx doesn't put a steady tone on the opposite

I have an old Telex ProCom I amplified microphone that has never been used and I was thinking that it might be a good match for my BITX40.? It uses an Electret element and has a fixed level output

Brent, I am using that circuit and it works pretty well. See my posting #32796. I changed a couple of caps and tapped it at the diode and fed that to an s-meter (or vu meter) circuit which displays on

Hello I'm thinking of trying to build an age circuit. I have ample room on the board I used to build the anti thump circuit. Does anyone have an opinion as to what is the best circuit to use? I was

Hello All, Let me introduce me a little. (sorry if I'm writing faults in English, no so easy using a French corrector !) I'm 49 years old . Electronic engineer in radiocommunication and power

Is it still possible to purchase the TFT/VFO boards for this project?? 73, -Rob N4MN

Randell, Running up on the increased inverse complexity of convenience, time to start monitoring power rails? Not being off the shelf plug ins, can’t just add up published specs. You are having way

Searching for the word "error" in your listing shows that it's having trouble with the si570 library. Could be a difference between Farhan's version of the library (he coded that several years ago)

afterall it is easy to compute the inductance of coil with 39pF cap in parallel to give a centre frequency of 14.1 (for 20m band range assuming 40 to 14.2. I use * mini ring core calculator where in

Rather than the duinovox I found a simpler circuit for interfacing data. It consists of 3 small audio transformers (got 10 for a little over $1, a couple of 1N4148 diodes and a 2n7000. I won a cheap

Doug Hendrick's recently published a dropin pcb replacement for the 42if123. He was learning how to make boards, and this was his project. He documented it in the qrp-tech files area, under KI6DS.

There was quite a bit of interest in this over in the FB group, so thought I would consolidate and add here. The project is call the "duinovox" by KB9RLW. I built this very simple, low cost circuit

Hi all, I'm puzzling with the Sweeperino. After many hours of trying I cannot make it working. I took the Sweeperino software from the Razzies website

Dex, I find if I reply on Eudora without trimming the trailing text, the groups.io strips the whole thing. If I trim below the signature and remove the dah-di-dah etc.. terminator, then the whole

I am with you Jerry! Without the relevant lines quoted, it becomes impossible to know to whom or what that reply is about unless I read on the web. Mostly I ignore these mails. Raj

I am using the schematic from: http://www.phonestack.com/farhan/ubitx/ubitx.html ( http://www.phonestack.com/farhan/ubitx/ubitx.html )

Here's the post about replacing the LC BFP wih a crystal filter: ?/g/BITX20/message/30538 ( /g/BITX20/message/30538 ) I remember that one. Don't remember any mention

Added another accessory board to the rig. Built up the duinovox by KB9RLW. It works great for FT8 even with the bodged wiring for testing. The VOX is cheap and easy to build.? and the board plugged