As built, my 20m QCX put out just over 1 Watt, increasing to 1.6 Watts after a few seconds of key-down.? This is with +13.6 VDC from my Astron power supply.? After reading this thread, I replaced the two caps in the LPF with 390 pF, 500 V, 5 % mica caps,
Dean,
It was speculated in that thread that because the inductors were too high in value the mismatch caused the capacitors to heat up causing power to rise. The capacitors are high quality and should not be faulty.
and removed a single turn from L2 and L3 Output power increased to a solid 2.5 Watts regardless of
key-down time. That's plenty of power to make contacts with, but it's
still considerably lower than the 4 Watts that other builders are
getting.
Not L1 also? Maybe more than one turn needs to be removed from each, I think others have found it necessary to remove two turns.
73 Alan G4ZFQ
