[R-390] R-390A Modified For Synthesizer Input?

[ToddRoberts2001@aol.com]

<PRE>I have some pictures of an R-390A receiver modified with a special jack panel 
on the rear panel with 3 BNC input jacks that appear to be inputs for 
external synthesizer control of the receiver. I was wondering if anyone in 
the list has seen an R-390A modified in this manner? I'm not sure if there 
are any extra switches on the front panel to enable/disable the special 
inputs on the back. Looks very unusual. To see the pictures type in (or copy 
and paste) these addresses :    members.aol.com/toddroberts2001/Item7.jpg     
     or             members.aol.com/toddroberts2001/Item8.jpg          Thanks 
for any info on this. 73 Todd Roberts WD4NGG.