[Heath] Weak S-Meter on HR-20 Rcvr

[G3OOU at aol.com]

Hi Sandy
 
I would check all of the resistors with a test meter and the unit cold.  
Replace all that are out of tolerance. Also make sure that the contacts on the 
 rotary switches, relays and connectors are free of any  oxidation.
 
Do you have access to a calibrated signal generator? That would help to  
determine the overall sensitivity and the individual gain of each stage in the 
 receive path.
 
73

Bob

Bob F Burns G3OOU,  G-QRP 6907, @BobFBurns
Crystal Palace Radio & Electronics Club: _www.g3oou.co.uk_ 
(http://www.g3oou.co.uk/) 
Technical web site: _www.qsl.net/g3oou  

 
In a message dated 08/08/2016 18:17:41 GMT Standard Time, ac1wye at gmail.com  
writes:

Hello,  Folks! My little HR-20 Rcvr works really well after a good 
realignment, BUT  the S-Meter is very stingy. Sigs that are +20dB on a properly 
set-up rig are  maybe S7 on the HR-20. Sigs less than S9 on my other rigs, 
barely flicker the  S-Meter. I thought that the S-Meter amp tube was soft, but 
it's OK after  subsritution, so I'm not sure where to start looking. I suspect 
that some  of these older components have changed out-of-tolerance, but 
where's a good  place to start measuring? The HR-20's S-Meter zero pot was 
dirty but now  zeroes perfectly after cleaning, and the Antenna tuning cap is 
peaked before  reading.  


Thanks and 73,  Sandy AC1Y


-- 
Sent from  Sandy'sGmail  Mobile


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