开云体育

John Terrell's recording of the sbitx DE sending CW (message #106651) nicely shows the relay noise from the DE while sending CW (even though he is illustrating a different problem). Gordon Gibby showed me the fix for the relay noise back in his message #103870 and I applied that successfully in the V2 software. Evan Hand also talked about the source of the problem. With the V3 software it needs to be fixed again.

What I have done on the V3 software is make this change in sbitx.c
line 1319 change tr_switch_v2(1) to tr_switch(1)
line 1321 change tr_switch_v2(0) to tr_switch(0)

I suspect that the code that figures out what hardware you have and calls the correct tr_switch is OK, but this call to tr_switch_v2 was overlooked and not updated.

This change really improves my CW experience on the DE (won't change anything for anyonoe else though!) Please let me know if you think I am putting my hardware at risk.

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Mike - kb2ml

Hi Mike,

The code for determining DE vs V2 is buggy IF you have installed a device as node 08 on the I2C bus.? If someone added the SWR/Pwr sensor to the DE, that would be the case.

Regardless, your change does work (as you stated), and as long as you update the change every time the software is updated, it will work.? I would rather have a setting in the hw_settings.ini that is not updated or a command line switch on the build process.

73
Evan
AC9TU

Just to be clear, my audio files of the CW sputtering were not showing chatter from t/r relays. It’s the same on the V2 (I have both) and the V2 has no relays whatsoever. The sputtering seems to be related to the high demand on cpu resources with the chromium browser. I tried the Midori browser which is less cpu-intensive and the problem disappears.
Jack, N6LN

John, It's not related to the sputtering problem you are working, but, I do hear what I think is unnecessary relay chatter on your recording of the DE (not on the received signal, but actual relay noise in your shack). I think you can do away with switching the LPF relays on the DE everytime you key the radio.
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Mike - kb2ml