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Hello everybody. I have a version 3 of the uBitx. Is the negative feedback in the finals necessary or at least useful for the stability of the push-pull amplifier? I have seen the 26db 10w amplifier

thanks for all reply, i will try to put some ferrite to try to stop this RF, 73 de IW0HK Andrea

That's great news. I can't wait. 73 Owen Vk5fkov

Hi Jerry, I just realized the manual wasn't linked in the readme.md in the code, so I've added that link now (thanks for the nudge, Jim S). For your reference:

Andrea, I too have had that problem and RF was getting into my UBITX from the key paddle. I used some small diameter coax and a snap on ferrite to solve my issue. Good luck Barry K3bo

Indeed. That's why I always stuck with grounded grid for my tube amps. Much more stable. When I first ordered the uBITX ( impatiently waiting... ) I thought of doing a single-sweep-tube amp for it, or

do aim for stability and cleanness over raw power - and keep in mind this simple math: each time you increase power 4X this is 6 dB, and roughly it is one S-unit.? if we start with 10 watts, 40 watts

Jerry, KF6VB, Ooooh, an excellent opportunity for the QRP operator. Stuff a slingshot, a motorcycle battery, some magnet wire, and that new uBitx into a daypack, head on up that hill. That sort of

Hi Jerry, There's no compile-time requirements to use the favorites. To set a favorite, tune to the frequency you want to save, then short press the star icon, and finally long press the desired

Short and long press works as for me.? Works with a press of the favorite on the screen button, or the encoder wheel function button. There are only 4 favorites. Rgds, Gary

They should be easy having a gain of 20db on HF I get that much on 2m from a pair of them.Careful though, with the gain they have you can easy get into feedback situations if you are not careful with

I *** I apologize for that. Basically, I was excited to be doing ham radio for the first time in many years, and this was the group I was connected to. I'll try to keep the power down :). - Jerry

I assembled a v.6 last night, and installed Reed's firmware. Playing around with it, I cannot make sense out of the favorite frequency function. Do the favorites need to be defined in a sketch prior

There is the Hardrock line of amp kits: https://www.hobbypcb.com/index.php/home and a forum on Google groups: https://groups.google.com/g/hardrock-50-technical-forum -Dj -- Dj Merrill - N1JOV

MRF300AN and MRF300BN. They are said to have an in-circuit gain of 20dB. If that's true, then 6W in - gets you 600W out. - Jerry KF6VB

Hi Jerry, Which transistors are in the finals of this kit you bought? I'm using a BLF9120 based kit I bought on aliexpress, it works pretty well, but up to 100W at most. Rafael PU2UIT

I was never overly confident of the two small heat sinks supplied for the IRF 510's. I had made a modification to get rid of the heat on the 5 volt regulator and also steady the vertical board which

High power amplifiers seems to be the antithesis of where we are going on a mostly QRP based discussion group. Some may disagree, and they are entitled to do so, but please respect the fact that this

After looking around the web some at anything "amateur linear amplifier", seems to be mostly CB'ers speaking a mostly different language. They seem obsessed with how many "pills" (output transistors)

https://www.worldwidedx.com/threads/hi-power-cb.76239/ ?? _._