[Elecraft] Cables for the K3 to Yaesu Quadra Connections

[Joe Subich, W4TV]

> There is an RF choke between K3 chassis ground 
> and pin 5 and 12, thus isolating that ground connection.  I 
> don't think that will be a problem.  Does anyone have another 
> view?

The RF choke in the ground return line is an invitation for 
a "pin 1" problem as documented in several presentations by 
K9YC.  If you are using the 12V output of the K3 to control 
power on/power off in the Quadra, simply connect the power 
and ground leads at the K3's Aux 12V RCA jack. 

73, 

   ... Joe, W4TV 
 



> -----Original Message-----
> From: elecraft-bounces at mailman.qth.net 
> [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Jim Brassell
> Sent: Wednesday, February 25, 2009 5:38 PM
> To: elecraft at mailman.qth.net
> Subject: [Elecraft] Cables for the K3 to Yaesu Quadra Connections
> 
> 
> I have a quick question concerning the 12 VDC connection 
> between the Quadra and the K3.  I want to use the RF isolated 
> ground of the K3 for the 12 volt connection.  My plan is to 
> connect the RCA plug without a ground connection on the plug 
> and use pin 5 on the accessory plug as the 12 volt ground 
> reference.  There is an RF choke between K3 chassis ground 
> and pin 5 and 12, thus isolating that ground connection.  I 
> don't think that will be a problem.  Does anyone have another view?
> 
> Thanks for your time and any comment.
> 
> 73,
> 
> Jim, K4ZMV 
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