[Milsurplus] Navy RCH Dial Tracking

[Al Klase]

Hi Joe,

My guess is you have the LO tuned to the wrong side of the signal at the 
high end.  There will most likely be TWO positions of the trimmer that 
will allow you to hear an 11 MHz signal.  The issue is that the LO is 
supposed to be on the high side of the received signal. You most likely 
have the RF amps peaked to the image at the high end of the band.  
Things the go to pot in the middle.  Read the alignment procedure 
carefully.  The RCH manual is on BAMA.  See paragraph 4.33.  If set up 
correctly, you'll find the image of the test signal 1170 KHz (IF x 2) 
LOWER on the dial.

This is a dyslexic's nightmare, and an easy mistake to make.  So be patient.

Al

Carole White-Connor wrote:
>     I recently picked up a pretty beatu-up Navy RCH receiver. I got it playing
> but am having trouble with dial tracking. I need your collective wisdom. Here's
> what's up:
>
>     1. When I bought the set, the tracking on Band 4 (4.5-12 mhz) was way off.
> WWV was pretty close at 5 mhz. However, WWV at 10 mhz came in at about 9.5 mhz.
> Sensitivity was decent below 7 mhz but lousy to non-existent above 7 mhz.
>
>     2.  I made the alignment adjustments at the top of end of Band 4 (C-142,
> C-149 and C-153). I made these adjustments on WWV at 10.0 mhz.
>
>     3. Now, WWV comes in right on the money on 5 and 10 mhz. However, between
> those points, the dial is off. For example, 7.2 mhz comes in at about 7.7 mhz.
> Sensitivity is good.
>
>     4. Any ideas?
>
>     As always, thanks!
>
>                             Joe Connor
>
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>   

-- 
Al Klase - N3FRQ
Flemington, NJ
http://www.skywaves.ar88.net/


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