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I tested transmitting from my new zBit into a tinySA with 50 dB of attenuators in between. First the good news, the 2nd and 3rd harmonics seem ok (43 dBc down or more). But I also see spurs at

Boy, I was thinking bs170, and you said irf510, sorry

Why don't you like the bs170s

Unless they redesign the PA section to not use IRF510s, I have no interest. If the biggest difference is the display, which is the same size, only better resolution, I hardly see any reason drop more

Such is the nature of using MOSFETS not designed for RF amplifiers. I got so sick of the PA failures with my v3, I built one of K9HZ 20w PA boards and just bypassed the entire PA section of the v3.

And, less frequently, dahs.

When I replaced the FETs, I replaced the mica with an AlN (aluminum nitride) ceramic plate 22x28x0.6mm. On the back heatsink I put a quiet fan (92x92x25mm), not fixed, just clamped between two

thanks Ron..i have plenty of RPi zero's but wanted to use my M1 mac because its a lot faster..;-) ?i'll just use the RPi.. Mark

Hi Gyula, I have a V2 and run it on lower watts output. I am curious as to what your "small modifications" were. Thanks George VY1GP

Yes, it’s still missing dits. The full experience of detecting key closure and going all the way to transmit is not happening often enough per second. That would drive me nuts. It seems that Eric

Here is a video with the latest fw installed in the zBitx. CW keying is improved but still poor. Note also the delay in returning to rx after

Same on CW: https://www.youtube.com/watch?v=nlaQcaPtJx8 73, John AE5X https://ae5x.blogspot.com/

Depends on what Mac you have and whether the zBitx is running a 32-bit or 64-bit Linux. For 64-bit Pi OS, you can run an arm64 Linux VM on an M1 Mac, and use that as a build server. For 32-bit armv7

Looks like the original builder started but didn't finish the CW mods. I went through and finished all the necessary mods to get the radio to work in CW. I installed a key jack and decided to just

Yeah, what I know about git can be painlessly engraved on my left thumb nail in 36 point type. In italic! -=-=-=-=-=-=-=-=- 73, Gwen, NG3P [email protected]> wrote:

I am currently running 3.021.

Courtesy of archive.org, these might

OK, I made a little bit of headway. I learned that holding the menu button down makes it go into a settings routine where I was able to change some of the parameters. I didn't know how to get into

Changelogs should be "trivially" available through the git web interface. That doesn't mean that I personally know where the git repository is or how to display the changelogs. I even bet that certain

OK, that may explain what this mess of components soldered together with a couple of unconnected wires is (photo attached). I've circled the bundle, which looks like a couple of caps and resistors,