[R-390] Dial Calibration

[Barry]

>Hello All, I was recently given an R390-A made by Motorola I believe. The radio seems to work quite well and is even tolerable to listen to SSB with once tuned properly. The dial readout on my unit seems to be out of sync though. If I want to listen to 
>say 3.930 Mhz I need to set the Megacycle dial at 4 and the kilocycle at -930. In fact the kilocycle dial seems to only tune from about -900 or so to 900 and I can never get as far to bring up the + flag or indicator. I have removed the mechanical readout and can turn it by hand throught out the entire range and bring up the - and + indicators at both ends so I know it isn't binding. 
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>Thank You 
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>Tom Elmore KA1NVZ
>Anchorage, Alaska 

Tom,

A common failure mode is a broken gear clamp.  You might check to see if the cams are moving the entire time you turn the KC knob.  If so, then it could be a broken clamp on the PTO drive mechanisms.  As you rotate the KC knob, look underneath the radio and see of the PTO shaft is turning.  It could be loose clamps on the Oldham Coupler.

Good luck,

Barry - N4BUQ