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564micgain [2007/03/29 15:58]
n5na created
564micgain [2007/05/21 00:43]
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-====== Increase the VOX Response When Using a Heil Mic with an Omni VI+ ====== 
-**From the Ten-Tec Reflector October 14, 1997** 
  
-I talked with Ten-Tec Service, and they advised me to change R55 from a 330K to a 470K resistor, and R54 from a 47K to a 22K resistor. ​ I won't be able to do this myself until after CQWW, so if someone gets a chance before the end of the month, please let me know how well it worked out. 
- 
-Rick Andren (N9THC) 
- 
-**From the Ten-Tec Reflector October 15, 1997** 
- 
-I installed the mod reported by Rick, N9THC, in the mike preamp on my Omni VI. It was very similar to one I had already devised but I decided to install a more "​official"​ change. The mod (change R55  from a 330k to a 470k and R54 from a 47k to a 22k) does increase the gain needed by the Heil cartridges. The approach I used was to just shunt R54 with a 39k and insert a 139k in series with R55. An 
-additional mod I added was to shunt C50 (.1 ufd) with a 10ufd capacitor. My voice is quite low and, by doing this, the preamp accommodates my voice characteristics. 
- 
-73, Troy, W6HV 

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