[R-390] Zero adjust on R-390 receiver

[Anthony Casorso]

It is a mechanical clutch that connects the PTO drive to the veeder-root display. You tune in your reference signal (like WWV or whatever) and then turn on the BFO. With te BFO control centered, you tune in the signal and set the dial at the "correct" frequency. For example you tune in WWV at 5Mhz and adjust the tuning for 5.000. Then you crank the zero adjust knob clockwise enough turns to release the clutch. Then you adjust the Kilocycle tuning knob for a zero beat. The display should not move because the clutch is released. Then you unscrew (CCW) the zero adjust knob to re-engage the clutch. Now you have zero beat at a dial setting of 5.000.
Tony

> From: w3hm at frontiernet.net
> To: r-390 at mailman.qth.net
> Date: Sat, 16 Mar 2013 12:32:21 -0400
> Subject: [R-390] Zero adjust on R-390 receiver
> 
> Can anyone explain how the Zero Adjust works on an R-390 receiver.  I have
> two of them and the Zero Adjust doesn't work on either one.  The manual is
> of no help.
> 
>  
> 
> Howard
> 
> W3HM
> 
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