[CW] OT - Please Excuse - Mag Loops for CW (and other modes)

Sat Mar 14 15:20:21 EDT 2015

Ken, no balun required and SGC recommends against any outboard balun use 
whatsoever.  I have a special SGC cable that runs the shielded 12 VDC 
cable parallel to the 50 ohm coax.  SGC sells it by the foot. I'm using 
25 feet.

David, SGC is not the only producer of autocouplers today but I'll say 
that mine is 10 years old and has been in constant use with not a single 
problem.  It's rated for 100 watts max and 3 watts minimum is required 
to initiate tuning and it's been a most reliable and effective solution 
for this townhouse dweller.  Although I operate primarily QRP, I 
sometimes switch in the 100 watt amplifier and at this higher power 
level, there's no RF floating around the shack.

Any discussion of compromise antennas for those of us who don't have 
much choice in the matter is really a chore because what works in one 
environment won't always work in the other guy's environment.  Most 
discussion usually end up in arguments.   All I can say is that I can go 
from 80 through 10 with up to 100 watts by just jabbing my TUNE button 
on my KX3.  Actually I don't even have to jab the button because if I 
just start sending, the SGC237 finds a match in a split second anyway. 
 If I want to run QRP or QRPp below the 3 watts, I just tune on 
frequency first at 5 watts and then adjust the power downward.  The 
autocoupler holds tune just fine.  

73, Stan WB2LQF

On Sat, Mar 14, 2015 at 02:47 PM, Ken Brown via CW wrote:

I looked for any mention of a balun
       between the SG-237 and the ladder line.  Seems like without one
       the "ground" terminal of the SGC, and the shield of the coax, and
       the DC power lead (maybe the SGC is getting DC power through the
       coax) would all have a bit of RF voltage on them. Not saying this
       would make it not work. Just seems like it would be nice to try 
to
       force the currents in the ladder line to be equal and opposite.

       N6KB

The feedpoint autocoupler is (not
         *was*) an SGC237. 

If you don't mind tell us all about the feedpoint
             autocoupler, autotuner?

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