Chasing down SSB transmit oscillations on 40m and 20m, I got suspicious that the band-pass filters were not being properly triggered by their relays on transmit. I measured them and got the results you see below and in a more readable image attached.
Is there a table that give me the voltage v frequency so I can see if mine are correct? I cannot quite match up the circuit description (attached) with TXA, TXB, TXC and which relay should be energized at which frequency.
Frequency MHz??? TXA??? TXB??? TXC??? Notes
Resistor volts right side???
??? ??? R151??? R152??? R153???
3.550??? ??? 5??? 5??? 5???
5.357??? ??? 5??? 5??? 5???
7.200??? ??? 5??? 5??? 0???
10.125??? ??? 5??? 5??? 5??? Audio heard on speaker
14.300??? ??? 5??? 0??? 0??? Distorted audio heard on speaker
18.140??? ??? 5??? 0??? 0???
21.300??? ??? 0??? 0??? 0???
24.940??? ??? 0??? 0??? 0???
28.600??? ??? 0??? 0??? 0???
When right side measures 5v, left side is 0.7v, otherwise 0v??? ??? ??? ???
In case anyone wants to measure the voltages on their working uBitX the photo shows the three resistors.
This is a follow-on to my original call for help on this site:
uBitX SSB transmit oscillations on 40m only
uBitX SSB transmit oscillations on 20m only
Bruce W4BRU