I have been following the thread, however not sure I have any good suggestions.? The first thing that threw me off was the measurements given in the first post:? The resistance measurements do not make sense.? A true dummy load would always measure 50 ohms, as it is all resistance that is supposed to be independent of frequency.? The second thing that does not make sense is the voltage readings.? For 10 watts in 50 ohms, you should have about 22 volts RMS.? Assuming the meter is reading RMS (NOT a good assumption at 28 MHz) then 1.4 volts would be 0.04 watts.? That means the PA is not working, or more likely the measurements are not valid.
The fact that you can bearly hear the other radio suggests that the BFO is off from the SSB filter.? I would start work on the receiver with the adjustments in the Ashhar Farhan video on calibration.??
? using the BFO Tuning Page:?
The BFO does affect SSB transmission.? It is turned off during CW transmission.? Still, get the receiver working before you start on the transmitter.
When the receiver is working, then I would do the initial test in the v5 instructions:?? Here you are interested in the PA bias adjustment.? Does your VOM measure DC current up to 2 amps?
I would also be interested in the current draw when transmitting.? Might explain the low output if the finals are not really working.
There is a possibility that something was damaged when you were trying the transmitter out, especially if the load is not very fay off in impedance (More than 2:1 SWR).? That is why I am suggesting the PA bias run.
Dale had some other suggestions for the difference in signal strength that could explain what is happening with the SDR measurements.? Another possibility is that you are detecting the signal of the driver and that the finals are not working.? If that is the case, then any data would be suspect.?
Hope this helps.
73
Evan
AC9TU
