Steve, I'd also suggest trying the mic output unpadded and starting with
0dB HW gain. The schematics are not easy to follow/piece together but it
looks like the Orion II has a 1K resistor followed by a 100K pot at the
input to the SSM2166 mic IC. I believe the 100K pot (R8) has an access
port if you needed to set it, but don't know where off the top of my head
(probably above or below the front panel).
My experience with the Orions is that they are happier with a higher output
mic.
73, Barry N1EU
On Wed, Apr 8, 2015 at 8:56 AM, Barry N1EU <barry.n1eu@gmail.com> wrote:
> Steve, the Orion II has an internal 2.2K resistor in series with +10V/pin2
>
> Schematic is viewable at
> http://www.tentecwiki.org/webarchive/566/schematics/566KEYPAD.PDF
>
> 73, Barry N1EU
>
> On Wed, Apr 8, 2015 at 5:22 AM, Steve Ireland <vk6vz@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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>
>
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