[Elecraft] K3 and YAMAHA CM-500

[ayoshida]

Joe

Thanks for suggestions.  I will try that.

73 de aki
ja1nlx

(2014/08/31 22:38), Joe Subich, W4TV wrote:
>
> Connect a 5.6K Ohm resistor between pin 6 and the ring of the CM-500
> and a 1 uF capacitor between the tip of the CM-500 and pin 1 or
> simply *disconnect* pin 6 and use bias for the K3 front mic jack.
> Tip and ring are connected together in the CM-500.
>
> There is a 10 uF capacitor from pin 6 to ground (in the DSP power
> supply).  That effectively shunts *any* audio to ground <G>.  You
> must use the 5K6 Ohm resistor to prevent this loss of mic audio.
>
> 73,
>
>    ... Joe, W4TV
>
>
> On 2014-08-31 3:45 AM, ayoshida wrote:
>> If CM-500 is connected to rear panel mic jack it works fine, however
>> if it is connected to front panel mic jack via conversion connector
>> I have a very low mic lebel with max mic level setting.
>> If CM-500 is connected to KX3 it works fine.
>>
>> CM-500 mic plug to 8p plug connection in conversion connector is like
>> this.....
>> tip to pin-1
>> ring to pin 6 (K3 provides 8V regardless Bias ON/OFF)
>> sleeve to pin 7
>>
>> I have another electret condenser hand mic. If this mic is connected to
>> K3 front panel mic jack it works fine.
>>
>> If CM-500 is connected to K2 (where 5V is provided to pin 6 of mic jack)
>> using same
>> conversion connector it works fine.
>>
>> Any suggestions please.
>>
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