[CQ-Contest] Reducing Pain in Ears and Bum while Contesting

[Jim Brown]

On Tue,11/24/2015 7:02 AM, Chuck Dietz wrote:
> The CM500 needs batteries?

No, but it's an electret mic, and like all electret mics, does need DC 
bias.  A "battery box" comes with it.

> Or can it be powered from a rig like the Icom?

Yes, 5K resistor (value not critical) from V+ (typically about 8V) to 
Mic Hot.. Virtually all modern ham rigs (30-40 years) have V+ at the mic 
connector, different pin by brands.  It's also a fairly "hot" mic, so 
you may need to turn gain of way down rig (I did with FT1000MP to use at 
PJ4A). I did, and it sounded very good.

73, Jim K9YC