[Elecraft] Yamaha CM500 Headset

[Ross Primrose N4RP]

On 2/16/2012 2:46 PM, orthodoxhome at cox.net wrote:
> ---- k6rb at baymoon.com wrote:
>> sound is better, and the mic works much better.
> I have played with my newly acquired CM500 using the test server on Echolink, and heard a definite background noise - which I think was from the server.  I tried biasing the mic (with the enclosed AAA device), and heard no difference.
>
> When does this electret mic need to be biased?
>
>

Whenever it's being used. That said, if you plugged it into a PC mic in 
jack, the PC was biasing it...

73, Ross N4RP

-- 
FCC Section 97.313(a) “At all times, an amateur station must use the minimum transmitter power necessary to carry out the desired communications.”