Increased 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

QR Code
QR Code 564micgain (generated for current page)