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For any of us who might want to probe the circuit boards for noise sources, and/or possibly add bypass caps or clock buffers, are there any silkscreen images or PCB photos available so one might know

When i have the display attached it would be cool to have sound out of the monitor speakers.

Additionally loading the SI5351A output heavily pulls it out of its self-limiting range, degrading composite noise. This can be seen in the work that Hans (QRP-Labs) has done on his Phase noise

Thanks, Gordon! I'll try to learn and have your optimism! El dt., 15 d’abr. 2025, 23:10, Gordon Gibby KX4Z via groups.io <docvacuumtubes@...> va escriure:

No, I’m sorry, I can’t be more specific. The issues are difficult and lots of people are working on them. Eventually, they will come up with better and better solutions just as we did with the

As a followup, I put some scope probes on my keys, a ubiquitous Bencher and a Code Warrior.? The 2nd has magnetic return which seems very slow.?? It was very difficult to get a contact that was

Could you please be more specific to convince me?? Mikel L. Forcada / Alacant / l'Alacantí / País Valencià mikel.forcada@... El dt., 15 d’abr. 2025, 22:43, Gordon Gibby KX4Z via

Thanks, Juan, that's great advice! Today I finally solved a mystery -- the "buttons" that I put on the board for manual control of Elevation were not working correctly.? ?Everything else worked!?

Don't worry -- it will get better!! Gordon KX4Z

The fact that reducing the drive current to 2mA made an improvement argues in your favor zl1uig. Perhaps some enteprising soul can put a transistor buffer or other buffer in between and tell us if

Yes sir, That is the fix for my problem. I put the 30 amp supply in line and now get 20 watts on 20 meters. I was planning for the worst case and total relief. I put the Drive at 25 and keep under

I'm on a V3, but when I TX using the test tone on 40M it's pulling ~7.5A at 13.6V. Normal use case (like FT8) will be closer to the 6.5A number you are seeing. Best to get a supply with some head

The Si5351a is primarily made to drive logic (relatively high Z). Driving low Z loads will pull the output levels out of their saturated 3.3v output which causes further non linearites. At high loads

Dean, I should have mentioned that you can operate the sBitx with your power supply. I suggest setting the transmit drive so the voltage starts declining and backing down a little on the drive. That

Jeff, Is your radio a V2 that is still capable of 40 watts? My V3 uses less than 6.5 amps for 25 watts, the max for a V3. 73 Evan AC9TU

Hello Dean, The sBitx requires 6.5 or more amps at 13.8 volts.? Your power supply is not capable of powering the sBitx to 25 watts.? A quick check with a voltmeter or current meter in line should

You'll need a larger power supply. My radio at full power draws nearly 8A. Jeff ________________________________ Sent: Tuesday, April 15, 2025 11:59 AM To: [email protected]

GM all, I have been reading and enjoying the sBitx V3. I have seen some references to output power of the rig to be above 5 watts. I just read the technical data and "Maximum power output of 40 watts

Any special conversion to the log file on the zbitx to get an adif file for import to a logging program?

I've examined the schematic and I do have one concern about the 3.3V regulator feeding the SI5351; I noticed that there is not a cap on the input side of the chip, and only a 0.1 uF on the output