[Elecraft] K2 Use of CC1 K Heil Mic Cable

[Joe Subich, W4TV]

>  I use the Heil CC1 K cable and a Heil mic for my K3, and it 
> works fine. I tried the same CC1 K cable and Mic on the K2 
> and it does not work. 

Which Heil microphone?  

> I have the Elecraft MH2 hand mic for the K2 and it 
> works fine, so the radio is not the problem. 

I presume you have installed the resistor for bias in the K2.  
If you are using a dynamic mic from Heil, the resistor must 
be removed as the bias (DC) will prevent the diaphragm in the 
dynamic mic from moving and reduce the already low output.  
 
> The MH2 mic also does not work with the K3. Is that also 
> correct? 

The MH2 works very well with the K3 but you need to turn on 
the bias and set the K3 for low input gain (fP.L or rP.L). 

In general, dynamic microphones can not stand the presence 
of bias (DC) on the mic line and have a low level signal 
(require a high gain input).  Electret mics (like the MH2, 
of Heil iC elements) require bias on the mic line for their 
internal preamplifier and have a high level signal (need 
a low gain input to prevent overdrive/distortion).  

73, 

   ... Joe, W4TV 
 


> -----Original Message-----
> From: elecraft-bounces at mailman.qth.net 
> [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of KM4VX
> Sent: Sunday, February 28, 2010 11:03 AM
> To: elecraft at mailman.qth.net
> Subject: [Elecraft] K2 Use of CC1 K Heil Mic Cable
> 
> 
> 
>  I use the Heil CC1 K cable and a Heil mic for my K3, and it 
> works fine. I tried the same CC1 K cable and Mic on the K2 
> and it does not work. I assume the Kenwood mic configuration 
> for the K3 is correct but that is not true for the K2. 
> Correct?  I have the Elecraft MH2 hand mic for the K2 and it 
> works fine, so the radio is not the problem. Are the pin 
> configurations different? Why would  Elecraft do that? I am 
> asking if the pin configurations are different because I 
> can't believe they are? The MH2 mic also does not work with 
> the K3. Is that also correct? This is a little crazy guys. Thanks
> -- 
> View this message in context: 
> http://n2.nabble.com/K2-Use-of-CC1-K-Heil-Mic-Cable-tp4649314p
4649314.html
Sent from the Elecraft mailing list archive at Nabble.com.
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