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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/ ?? _._

Indeed. *** It's a 6BTV vertical perched on the side of a hill. I'm pretty sure the hill is the problem. I used to get excellent reports from the south Pacific. There's a 300-foot coax run from the

There is one on facebook. I am no longer on facebook so I can't retrieve the page's link. - f

700 and 1900 hertz were injected into the mic jack.? I had adjusted the level for the maximum power without causing an increase in the IMD3 measurement. I measured the expected 2xfa +/- fb.? 4

Jerry, KF6VB, There might well be better forums to complain that 100W is not enough.? ;-) I'd take another look at that antenna. Should be a bunch more sunspots coming along soon. Let me know when

Why not use phase modulation instead pure FM? The receiver doesn't know the difference and a simple phase modulator stage could be fitted after the clock output, I recall using a germanium transistor

All, I know this isn't the right forum for this - anybody know of a forum for people building linear amps? Last night, I had my first contact in some years. A pleasant gentleman in Calgary.

Evan, That all looks good, thanks for doing such a thorough analysis! IMD could vary wildly depending on mike gain, and RV1 setting. Also, various builds may have significantly different gains due to

Jerry, I did do the testing of my modified v4 against my unmodified v5.? I have posted the power levels of the v4 on this thread.? The IMD measurements that I got are as follows: Modified v4:

I am looking forward to this talk.? I have at least one ?BITX that I plan to convert. 73 Evan AC9TU

I am really looking forward to this talk. It is the summary of almost a year's experiments in SDR starting from zero. I also describe how to convert a standard issue ubitx into an sdr using a

farhan@...> wrote: *** In a former life, I was responsible for repair & maintenance of something called the "Omni 2000". It was an elaborate rack wiring tester. Given a prewired equipment rack,

http://qrparci.org/?utm_source=sendinblue&utm_campaign=News_04012021&utm_medium=email note this talk " *Ashhar Farhan VU2ESE - sBITX - An Open Source SDR that YOU can hack!"* -- 73 Bob? KD8CGH

The smart, handsome, modest author of that BOM would like to point out that it is for V1.02, not V1.01, so not ideal for Justin. There is a V1.01 BOM here /g/ucx/files/uSDX.xlsx And,

Well that explains things. I didn’t realise that they had it that bad. Over there. Just goes to show you how different the world is these days. I guess I’ll wait awhile. Poor guy. 73, Robert,

Justin, I found the website where I saw the uSDX BOM for Digikey. Here’s the URL: /g/ucx/files/WB2CBA%20uSDX%20PCB%20V1.02%20Digi-Key%20BOM (