[Elecraft] K3 and SM20

[Joe Subich, W4TV]

If you connected the +8V DC line from the SM-20 to pin 6 when 
you rewired it, you are getting bias.  The K3 pin 6 power is 
present independent of the mic bias (pin 1 power) setting. 

73, 

   ... Joe, W4TV 
   




> -----Original Message-----
> From: elecraft-bounces at mailman.qth.net 
> [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Barry Simpson
> Sent: Tuesday, August 12, 2008 5:50 AM
> To: 'Elecraft'
> Subject: [Elecraft] K3 and SM20
> 
> 
> In readiness to use my new K3 I have rewired my Icom SM20 mic 
> to the K3 configuration. I was surprised to find that it 
> works exactly the same with the bias on or off. To ensure 
> that K3 FP mic bias is performing correctly I have also tried 
> out my new Elecraft Heil Proset. That works fine with the 
> bias on but not at all with the bias off which is what I would expect.
> 
>  
> 
> I thought the SM20 required bias as it is an electret mic but 
> that does not appear to be the case.
> 
>  
> 
> Has anyone got any experience of the SM20 with the K3 ?
> 
>  
> 
> Barry Simpson  VK2BJ
> 
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