[TenTec] Using a Yamaha CM500 headset with TT Orion II - advice needed!

[Barry N1EU]

I understand the frustration Steve.  That's why I've taken to always use
the little battery bias adapter that came with my CM500.  The batteries
really last a long time and I no longer have to worry about the bias.
Lately I've found I prefer a non-isolating headset and have switched over
to using inexpensive PC headsets where the battery bias adapter likewise
comes in handy.

73, Barry N1EU

On Wed, Apr 8, 2015 at 5:22 AM, Steve Ireland <vk6vz at arach.net.au> wrote:

> G’day
>
> I have been trying to use a Yamaha CM500 headset with my TT Orion II and
> have been having a few issues in getting levels right in the Orion with the
> electret mic.  Please, if anyone is using a similar set-up and are happy
> with the results, I’d really like to know:
>   a.. what is used in the way of a resistor/pad between the 10V output
> from the TT Orion mic socket and the 3V CM500 electret bias?
>   b.. what is used (if any) in the way of a pad to reduce the output of
> the electret mic?
>   c.. what setting is used on the MIC gain (i.e. the DSP mic gain, set
> using the MIC button and the MULTI pot)?
>   d.. what dB setting is used on the H/W mic gain (i.e. the hardware mic
> gain, set using SSB menu function)?
> At present I am using two 2.2K in series as a voltage divider to reduce
> the 10V bias to around half (i.e. 5V), and then reducing the electret mic
> output by a voltage divider using a 430 ohm resistor in series with a 220
> ohm resistor and taking the output from the top of the 220 ohm. I also have
> a 4.7uF electrolytic in series with the electret mic output voltage divider
> so as to block any DC potential (to be sure, to be sure) coming from the
> electric mic element back into the TT Orion mic audio input.
>
> My current set-up isn’t working (sounding) well and the best thing seemed
> to be to ask for some advice.
>
> Vy 73
>
> Steve, VK6VZ
>
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