[Elecraft] KPA500 RFI problem

[Fred Jensen]

On 1/8/2013 6:58 PM, Ron Kenwood wrote:
> Fred:
>
> Should have done that first, but I got tunnel vision on the RFI
> solution. I have an AIM4170B which should do the job. I will let you
> know how it goes.

OK, don't jump to conclusions though.  If the impedance you measure on 
the coax side of the balun is really high, it is 4 times that on the 
"balanced" side, which at that point may not be all that "balanced."

If the impedance you find is very high, look carefully at your balun. 
If it's been arcing from over-voltage, you might find it.  One way to 
fix this is to change the length of your feedline, but of course, that 
screws up all the other bands.  Maybe your 120' dipole just won't work 
on 12m for you.

Looking forward to your results, antennas are one of the last bastions 
of ham DIY.

73,

Fred K6DGW
- Northern California Contest Club
- CU in the 2013 Cal QSO Party 5-6 Oct 2013
- www.cqp.org