Some transverters suffer from false overload detection due to noise on
the DC circuit to the microprocessor.
The cure I have found effective is to remove the front panel metalwork
and solder a 0.1 uF capacitor between the collector and emitter of Q7.
> Just starting Part VI-Filter Alignment, other tests prior worked no problem.
> Using a KX3 on 5 watts with XV-144 set to 5 watts input.
> With key line and coax from ant socket (kx3) to XV-144.
> Dummy load via power meter connected to output of XV-144.
> The XV-144 goes into overdrive protection whatever power I apply to the
> input all I get is the power led's flashing on the front panel.
> Any ideas where to look, am I missing something?
Thanks for the reply.
I have the capacitors on the reg and the electrolytic cap on pin 1 and 2.
I am using a separate supply on the XV-144 compared to the KX3, will try using the 1 supply.
Then I will fit a 0.1 uf on Q7.
I have seen this before when the 2.5mm key line jack just needed pushed firmly home. A 2.5mm jack doesn't have the mechanical resistance to stay in by itself. There is also a pesky metal ridge round the socket on the kx3 which causes some jack designs to disconnect when rotated. TX without the key line causes the front LEDs to flash.