Hay Elecrafters,

Got a question for you.

Why does only certain microphones operate the VOX properly? I have the most 
recent firmware (downloaded yesterday) installed.

I have 2 different microphones. One is an EF Johnson (manufactured by Shure) 
which is dynamic and an ICOM desk mike which requires bias to operate.

 Both mikes operate normally in SSB mode with the mic gain around 40 for the 
dynamic and 30 for the ICOM. 


Using the ICOM the VOX works wonderfully. one of the best VOX I have ever 
used.(VOX Gain set about 40).

Using the dynamic mic with the bias off, despite the fact that I get good audio 
reports and driving the rig quite well I have to set VOX gain to 100 and have 
to really shout into the mic to get the VOX to trip.

Any ideas?

Thanks and 73
Dave KD1NA
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