Cables for the K3 to Yaesu Quadra Connections

[Jim Brassell K4ZMV]

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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[Joe Subich, W4TV-4]

> 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: [hidden email]
> [mailto:[hidden email]] On Behalf Of Jim Brassell
> Sent: Wednesday, February 25, 2009 5:38 PM
> To: [hidden email]
> 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
> ______________________________________________________________
> 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

______________________________________________________________
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