[Elecraft] K3 in NAQP SSB

[Alan Bloom]

The obvious solution is just to use the K3 +12VDC output connector for
all accessories.  It's rated for 0.5A which should be plenty for most
devices.  As a bonus it's controlled by the K3 ON/OFF switch.

Al N1AL


On Mon, 2008-08-18 at 16:47, Joe Subich, W4TV wrote:
> Tom writes: 
> 
> > Be especially aware that rigs with external 12V supplies can 
> > develop what sounds exactly like RFI from "pin 1" problems.
> > 
> > This is because the power supply leads of the SSB radio are 
> > current modulated at an audio rate. If the 12V supply has a 
> > ground connection common to the negative lead post on the 
> > supply (or through other gear) the V- lead voltage drop can 
> > cause a "pin 1" issue from dc potential that varies at an 
> > audio rate.
> 
> This is a particular problem with transceivers that have a 
> single V- lead and only one "pin" for the V- connection (like 
> the K3).  ...