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K3 and YAMAHA CM-500

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ayoshida

K3 and YAMAHA CM-500

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.

--
73 de aki
ja1nlx

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Joe Subich, W4TV-4

Re: K3 and YAMAHA CM-500

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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ayoshida

Re: K3 and YAMAHA CM-500

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.
>>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [hidden email]
>

ayoshida

Re: K3 and YAMAHA CM-500

In reply to this post by ayoshida

Hi all

Thanks for suggestions. My problem has been fixed.

a) Pin 1 is connected to Tip and Pin 7 is connected to sleeve.
b) Set FPH Bias and tap "7". Again tap "7"

Everything works as expected. I have same level now with FPH Bias.
I do not know why I need to tap "7"

73 de aki
ja1nlx

(2014/08/31 16:45), ayoshida wrote: