[Heath] SB-100 TX audio gain question

[G3OOU at aol.com]

Hi Sandy
 
Before you go looking for a problem that may not exist:
 
1. can you measure the output from your microphone that achieves full power 
 from your transmitter?
 
2. Do you have access to another microphone or SB-10x rig to do a  
comparison?
 
I published a mod some years ago on my technical web site that increases  
the Tx audio gain in my SB-101 but I do not suggest using that until you have 
 established that there is no fault in your microphone or Tx.
 

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 28/12/2015 00:54:15 GMT Standard Time, ac1wye at gmail.com  
writes:

 
Hi,  Folks!


My  SB-100 is working fine, with one little exception: to have any TX audio 
out, I  need to have the MIC/CW Level set virtually max. Checked the output 
waveform  on my SB-610 scope, and it appears clean. The tubes in the mic 
audio chain are  good, so I'm not certain what may be up. Seems as if the 
level should be  optimal around 50% or a little greater, but not maxed out.


Anyone  have a suggestion where I might start looking?



 
 
 
 
 
 
 
 
​73,​



​Sandy  AC1Y​


Alexander N. Gerli, Sr.

548 Allred Mill  Road

Mount Airy, NC  27030-2202


Scotsmen walk about 900 miles each  year.

A Scotsman drinks around 45 gallons of Whisky a  year.

Scotsmen get about 20 Miles Per  Gallon.






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