[R-390] Need 390 help

[Flowertime01 at wmconnect.com]

Bob,

Some of these mid stage setups do not work well.

Just inject the signal generator into the antenna input,
Have a volt meter off the diode load.
Set the receiver to MGC, RF to max. BFO off.

With the generator on CW and some where between 31 and 32.
Run the KC around to peak the diode load signal to the exact signal generator 
frequency.

Back the generator output down to the micro volt range.

You should be able to get the trim cap in the osc deck to peak.

The you can work the equation in two variables of T401 slug and the 31MHz 
trim cap to the highest (most negative) value on the diode load.

If you get no peak on the cap this way, move down to 30 and see if other caps 
will peak for you. 

If every thing but the 31 will peak then you likely have a problem with that 
cap and its wire.

Remember that the osc deck also has a big rotary switch. That last contact 
may not be being made, do to a bit of wear and miss adjustment. This would 
likely be no 31 MHz output at all. 

T401 should not peak very sharp.

You likely will see no difference from the slug the first few times through 
the receiver. Losses in other stages are masking the performance of the mixers 
output through T401.

Roger AI4NI   </HTML>