Vic, 1. The pi on the zBitx does not come with a heatsink. We found that the Pi runs normally without one and we haven't faced any problems so far. As Farhan said earlier, n one of our software is

Hi Charles, The tip goes to microphone element, ring to the PTT switch, and the sleeve to ground. When you ground the ring (PTT) to sleeve (ground), the radio goes into transmit. This is mentioned

I looked briefly at some of his VOLUMINOUS work.   Amazing.    Each of us only have so many hours, and some of these folks have really blazed a trail for us.   I'm AMAZED at how much dynamic

Hi Steve, OM Farhan VU2ESE presented a prototype at the Annual LARC at Hyderabad, india on the 14th December, 2024. About a year ago he discussed the concept with block diagrams etc. Kind regards and

Great!!!

I kept thinking that the software could also have a problem. So I flashed the 4.2 software and sure enough it works now. At 50% drive on 20 meters I am getting 10 watts out with the mic set at 50. CW

I have some other radios. xiegu x6100 good enough. I have some 50v ceramic caps. I have a 100 pf.

OK, so you’ve got some DC connectivity Do you have another receiver anywhere? Do you have a capacitor somewhere, anywhere between 100 pF and 0.1 Uf that is rated for 50 V or more? If you do, we

I set the bias with my amp meter. That seemed to work. There is no output on the external swr meter. It doesn't show anything it the 2 watt mode. I have a good volt meter. The cans do get warm. They

Great going Gordon , hope these lessons continue to it's logical conclusion. It'll surely help someone and me offcourse. de VU2UPX <docvacuumtubes@...> wrote:

OK 1. I’m assuming you were able to adjust the idle current with the bias potentiometer and get expected results. If not, then there could be a DC disconnection somewhere in the power amplifier

Thanks Ashhar

It receives fine. I can hear everything that it should with an antenna. When I transmit in any mode I see that it looks like it is transmitting on the screen but it shows 0 watts and 1.0 SWR. Doesn't

We all understand!! 1. Does it RECEIVE? If you put an antenna on it, do you HEAR recognizable signals? 2. What exactly does it do when you try to transmit (specify mode, and what you see on the

That's a bit over my head. I would rather buy a new board than go that deep. I'll dig around a bit but if it requires equipment I don't have it's over.

time to break out the oscilloscope or build an "rf probe" if you don't have one, so you can begin to diagnose with a simple $6 digital voltmeter. Lots of learning opportunities! There are some

One of the legs broke on one diode. So I ordered more. Only problem is I put everything back together and set the bias. Still no power out. Starting to think I blew another fet or maybe there is a

For what it's worth, they are right that standard diodes have some continuity measured in one direction and nothing in the other direction. TVS diodes like the ones used in the sBitx V3s don't show

I’ve been trying different microphone combos with the microphone input and the thing is — I can’t figure out how to get the PTT on the mike line to work (running Dexx’s 4.2 btw). The ring on

Yes you are right, changing settings by