Des and Alan
I have just subscribed to the group and I wonder?if?either of you can help an old timer who has?only returned to amateur radio in the last couple of years after 30 years of no activity.
In fact, the last transceiver I built was a Heathkit HW8 which still works?- ?Hi Hi.
I have just completed building the QCX 80 and it worked first time thanks to the excellent Assembly Guide Manual.
In my opinion, I also have a slightly lower power output?than expected.
Using the online power meter, I ?have 5.2 watts on the drains of Q1, Q2 and Q3 (with both 9.5 and 11.3 V power source) and the following measurement across L1:
L1/L2 Junction = 3.3 watts (11.3V)? and?2.3 watts (9.5V)
L1/power output BNC socket = 2.0 watts (11.3V) and 1.5 watts (9.5V)
I understand these power measurements are not necessarily accurate values but serve for the purpose of comparison.
I note the possible removal of turns from the inductances L1, L2, L3 and L4 but before embarking on this I would be interested to know which inductance did you find was the most critical and turns removed.
I am fully aware that inductance values?can vary according to core material, tightness of turns, closeness of turns etc but would greatly appreciate your input as a quick fix until I can set myself up with the inductance measuring circuit.
Kind regards and 73s
Robin
G4DNP
