[R-390] Some R-390 questions...please help if you can.

[Roy Morgan]

On Apr 24, 2008, at 3:47 PM, Phil M. wrote:

> ..  The meters
> have what looks like to be an ink stamp on the lower right
> corner of the glass that consists of three concentric circles

Phil,

Just a guess on the meter stamps: they may be inspection stamps.

> ...the crystal oscillator frequencies do not match with what
> the manual shows the bandswitch should be....

With this situation, the receiver will act dead.

> is there any kind of measurement
> that I can make without removing the rf deck to confirm that
> the rf deck bandswitch position correctly matches the
> front panel indicator?

Yes.  Get another general coverage receiver, or your frequency  
counter IF it is sensitive enough (not likely), and see what  
frequency the crystal oscillator is on by sticking a probe wire next  
to the crystal oscillator tube.  That goes to the antenna input of  
the other receiver.  (The R-388 is ideal for this use.)

OR: put the probe wire down next to the mixer tube.  It's plate will  
have enough LO signal in it to give you a signal.

Normally, you can adjust the linkages between the MC set gears and  
the LO switch to get it right.  You will need a bristol wrench to  
loosen the clamps, and possibly a long nose pliers to move and then  
hold the shaft in position while the clamp is tightened again.

There's another possibility in the "duhhh!" category: are the  
crystals in the right sockets?  Maybe someone had them out and got  
them back wrongly.

Roy

Roy Morgan
k1lky at earthlink.net
Lovettsville, VA 20180