Thank you all for your answers, I will try to answer all your questions in the order received:
Peter G3SPL, well I noted that the minimum power consumption occurred at 9.2V.
If everything was OK it would get lower at higher voltage, but not.
This is an indication that something is not right
John Z and Alan, you came to the same conclusion as I did
All measurements are taken with a supply voltage of 9.0V
John Z:
both sides of R505 show 0.749V DC, no AC signal superimposed
PWM signal on the gate of Q501 is only present during transmit, amplitude 3.3V, goes to 0V between pulses
The strange thing is that in receive it does not rest at 0, it rests at 1V. Looks like the PWM output is changed to an input at receive
Q502: resistance gate to source 700kOhm, gate to drain 740 kOhm
Q501: resistance gate to source 10/7.3? kOhm, gate to drain 12/28 kOhm The first value with the plus tip ov the DVM connected to the gate, the second with the minus tip
My own conclusion: the signal on the gate of Q501 should be at 0V in receive... maybe i should try with a 10kOhm pulldown resistor in parallell with R502??
br SM5EIE / Gunnar
