[TenTec] Yamaha CM500 headset...Orion II

Richards jrichards at k8jhr.com
Mon Dec 16 06:24:45 EST 2013

On 12/15/2013 1:00 PM, cx7tt at 4email.net wrote:
>   Ok, am confused about CM500. I got one about 3 years ago and there was
> no 'battery box'. I simply plugged it into the back of my K3 and it
> works great. Has there been a change to what is shipped now?

		The K3 is designed to accept that type of
		microphone and provides the required bias
		voltage on the jack, and the AF-GAIN an d
		audio circuit for that jack on the K3
		expects and is suited or adjusted for that
		type of microphone capsule.

> With the basic headset, w/o battery box, does Heil make an adaptor for
> the O II? If not, does YC's suggestion of 5.6 k ohm resistor between
> -10v and mic pin still valid?

		If I understand the question correctly... it would
		not be required for the K3, but might be for the
		TenTec rigs under heretofore under discussion in
		this thread.

> I have gotten the CM500 to work with the O II by plugging it into the
> front panel of a microHam mK II but have to really turn down the gain.

		I am not as sure about this as I am about the K3,
		but I think the Microham device is also set to
		expect that sort of mic, but its internal gain
		settings may be hotter than the K3, and this would
		explain why it works OK, but runs hotter.

Just My take...

-------------------------- K8JHR  -----------------------

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