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CW Keydown I hear side tone no RF

Allison, Here's my summary of issues around that 45mhz IF, correct me where I am wrong. Swapping out Q20,21,22 to BFR106's helps fix gain variations with supply? voltage, and also reduces unwanted

Looking at the internal networks of several popular audio IC devices can reveal a number of techniques to make stacked output devices more linear. The datasheet for an LM368 is a good

Also, Arv: This will work but only if a small 'trickle' of + at input base produces a transition towards - at the output emitters. 73 de ZL2DEX

Oh how little Audio experience here! Any real Hi-fi amps using comp-sym pair will have a low resistance (1 down to even below 0.1 ohms) in each emitter, and a bit of extra resistance between bases

Good Morning, I am too novice - thus afraid to try and load a different firmware - but I read the code of the Ver. 4 Firmware and it?is different, the V3 program seems much easier to work with -

Thanks for the reply's guys. That is what I was afraid of. Personally, I had no problems with the FCI TDA2282M chip that was on my board, it worked flawlessly and didn't heat up excessively even at

I didn't address anything but the audio as I don't use the original Raduinos on any of my uBITX builds but I believe Farhan said it would work. The V4 board has the Raduino built with the NANO on the

Simple solution was to use a mic that has enough contacts on PTT to allow interrupting the? mic audio on receive.?? The pop and click mods usually help with audio on the speaker during

I know Farhan said it had enough audio to drive a small speaker, but I have not found this to be the case. Mine will drive the pants off of a pair of 32 ohm headphones (only set I have with a 1/8"

First are you testing in SSB or CW? IF CW you should see power with keydown. IF SSB you will see nearly nothing (microwatts) without audio input.? Are you putting audio in? First places to look,

Could be RF getting into it. Does it happen on a dummy load? The others are ground loop, poor grounding and cross talk between the leads. Allison

very bad sound. distortion when the volume is reduced.

Jerry, While current gain is needed the devices 3904s have a finite set of limits and at 45mhz we are on the line.? Mine seriously needed it.? The stage gain difference was 6db using BFR106 (or smt

How do the new V4 users like the audio? Is it clear, quiet? Is there enough audio if running a small speaker? I know what Farhan said in his audio description, but I'm looking for some real world

Thanks Marco, I hadn't thought to try a clip on core. Not having any on-hand, I guess this means I'll need to force myself run to Skycraft Parts & Surplus here in Orlando.

I'm all for it!

Thank you! :-)) Roy WA0YMH

Hi Tominaz: My build uses pins off the controller because I had a few of the digital pots in SPI format "in stock."? My controller is Teensy-based so I've got plenty of pins.? But a few people have

Try adding a clip on ferrite core. I had to add one to prevent similar issues while I continue to mod the transmitter section. Good luck Marco - KG5PRT