[Elecraft] Yamaha CM500

[Joe Subich, W4TV]

Jim,

This will get the CM-500 in the right range:

   Yaesu                                CM-500
                    5.6K
     2  -----------^^^^^-------+-------> RING
                               |
     8  -----+--------)|-------+-------> Tip
             |      .047 uF
              \
              /
              \ 560
              /
             |
     5,7 ----+--------------------------> Sleeve

The .047 uF and 560 Ohm should bring down the drive level to
something more appropriate for the Yaesu rigs (17 dB at 1 KHz)
*and* provide a low frequency roll-off to help with the excessive
bass in the "raw" CM-500.

Lu, the same connections should work with both Yaesu and Orion II.

73,

    ... Joe, W4TV

On 11/19/2010 2:15 PM, Jim Brown wrote:
> On 11/19/2010 5:48 AM, Luis V. Romero wrote:
>> when I travel to NQ4I, where my CM500 does not work!
>
> Lu -- thanks for the detailed rundown on the Koss unit.
>
> I don't know what radios are at NQ4I, but I'm headed to PJ4 for CQWWCW,
> where FT1000MPs are used. Before and after the contest, I may want to
> work SSB, so I made a simple connector adapter for my CM500 mic (8-pin
> mic plug, one resistor, short length of coax, to female TRS 1/8-in
> jack). Last night, I checked it out with the MP that's still in my
> closet as a backup rig.  I had to turn down the mic gain a LOT, but K6XX
> tells me that it sounds fine.
>
> The resistor goes from the 8VDC pin on the mic connector to the MIC hot
> pin on the connector.  I think I used 4.7K or 6.8K.  Any value in that
> range is fine.
>
> 73, Jim K9YC
>
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