[TenTec] Yamaha CM-500

[Tom Macon]

I'm using a CM-500 since the first of this year and it works great on my 
Omni VI.  I had a little trouble with RF feedback when taking the mic bias 
from my DVK, but switching it to use the mic bias from the Omni solved this 
problem.

My only other comment is that the earphones are very sensitive.  The AF gain 
setting is a bit unstable since it is barely cracked.  I need to make a 
cable adapter with a little attenuation.

 - Tom, K9BTQ

----- Original Message ----- 
From: "Jim Brown K9YC" <k9yc at audiosystemsgroup.com>
To: <tentec at contesting.com>
Sent: Sunday, March 21, 2010 7:22 PM
Subject: Re: [TenTec] Yamaha CM-500


> On Sun, 21 Mar 2010 18:48:59 -0400, w4svo wrote:
>
>>I an wondering if anyone has tried using this headset with the Orion?
>
> I don't own an Orion, but I've owned a CM500 for about four months, and 
> used
> it extensively with my K3 for long periods of contesting. I've used it
> directly with my Thinkpad and recording software to record contesting
> messages. It works VERY well in both applications.
>
> Contrary to what some Yamaha documentation says, it is an ELECTRET mic, 
> NOT a
> DYNAMIC, so you do need bias for it. The K3 provides that bias in the form 
> of
> 8 volts through about 5K to the tip of the mic connector. You could easily
> build a suitable adapter into a mic plug -- all it takes is that 
> low-wattage
> resistor from V+ on the mic jack to audio plus on the jack, and a 1/8-inch
> jack to accept the mic. Although it is a 3-circuit jack, no connection is
> needed to the ring contact.
>
> 73,
>
> Jim K9YC
>
>
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