[R-390] frequency counter connection point

[2002tii]

Tom wrote:

>The other problem, as we all well know, are the minor variations in 
>the crystals in the first and second mixer.  So in the end, the 
>accuracy would depend on the other mixers.

You should be able to program one of the programmable readouts to 
account for these variations, if you have the patience and either 
know the actual crystal frequencies or can determine the band error 
accurately by receiving a reference signal.

Alternatively, as long as one is adding stuff to the radio, one could 
use a good, stable oscillator -- HP 10811 OXO, rubidium standard, 
GPS-disciplined OXO, cesium clock, hydrogen maser, whatever -- and 
build a synthesizer to generate all of the oscillators for the 
crystal-controlled mixers.    ;-)

Best regards,

Don