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Rafael, If the device is in use by the sbitx software, could if be used on another application?? For example, to use wsjtx I have to shutdown fldigi for it to work. Let me know if I'm wrong. Juan

Hi Evan, I did what you suggested, and now I have 10W on 20m and 5W on all other bands.? Originally, however, I had different powers for each band thanks to the calibration of HF Signal for the

Hi all, In order to test if I can play / capture audio tru the alsa loopback, I just opened audacity and tried to capture... nothing. Audio comes out nicely over the gtk ui, and also over the web ui.

Farhan, ITs not the device loading its the posible reverse path due to that parts failure. Fr example if that mosfet develops a gat to dran short then the GPIO pin sees 12V and that's bad. the uln2003

Thanks, Lou. That thread is very illuminating, especially Allison’s comments. I believe I put in a 78L05 ahead of a1117 because of that suggestion. There’s a lot more information there that’s

Gary, Refer to https://github.com/afarhan/sbitx/blob/main/sbitx_main.pdf The pa bias is derived from 12v tx line that is switched by a mosfet. It is not driven by gpio. The uln2003 have a very light

If sBitx V1 schematic on github is correct, Main board's C66 (0.1uF) is being driven directly by the pi.? Cap load without an added current limiting series resistor. Surprised that so many TX

Paul The v2 does not use LM338, it uses a switching regulator. We also use a 7805 step down that feeds the 1117s. There are 3.3v zeners on all external facing gpio pins - f [email protected]>

While I wait for my sbitx v2, I have noticed there are no 'backward facing' clamp diodes on the fixed regulators that prevent the regulated output voltage (VOUT) exceeding the input voltage (VIN) on

Thank you Ashhar.? If I understand what you are saying, with version 2.5.4 of WSJT-X it did not reset the USB port, but they changed something in the code for WSJT-X 2.6.1 so that it does reset the

John, /g/BITX20/message/96629

Lou, I remembered that post from Allison but I can’t find it. What was the number of that post? Jack N6LN

Alvin, that is fine, I’m just would be really interested to know what I blew apart. That might help avoid a repeat! Gordon

Allison I found that post. Do you have any drawings you can share? 73 Lou KI5FTY

I found the Rpi output (and inputs) are fragile based on data sheets. So one of the mods I made and wrote about maybe 5-6 months ago were to buffer all lines out to the main board and and diodes and

Gordon, I have the time and have done some forensics on other devices.? I am NOT a Raspberry Pi expert.? I DO have the SMD tools that I need. With the above understanding, I would like to look into

Ashhar: No worries my friend.? Glad you are doing some final checks on the software of the radios.? It gets here when it gets here.? Will have some time this summer to tinker with the software.?

I don't have the time//ability to " It would be interesting to do the forensics on one of the dead RPis to see if that diode is shorted or open." If someone is really an expert on failed rPi's and

John, Trying the 3.3 volt (maybe 3.6 volt?)? with or without the resistor could not hurt.? The diode would add capacitance that might make the I2C decode an issue, so I would do the Zener first,

Mark, If you monitor the current draw of sbitx, it is well under 1A on receive. There is no way the rpi can draw more. There is some other reason, not low voltage. The low voltage warning happens