[Elecraft] Baluns & wires & feeders (oh, my!)

[Karl Larsen]

wd4lst at windstream.net wrote:
> I have been following the 135 ft flattop thread with interest. I was running my K1 into a 40m wire vertical via 100 ft of RG8x. After doing some loss calculations, that seemed pretty silly,
    A 100 feet of RG8X is a looser for QRP.
>  so I set out for a more efficient. arrangement. I just put up a 40m folded dipole (same diameter wires) fed with 300 ohm window line. My K1 (with internal atu)tuned it well, but rf reeked havok on the K-40 keyer and such, so I used the BL2(4:1) balun and all seems well (probably time to do maintenance on the shack rf grounding system). My question is this: Is there a way to measure the insertion loss of the balun? Perhaps setting up my scope to do a differential measurement on the output of the balun w/ a 300ohm dummy load? Also, I could rig a way to sweep the antenna/window line with the antenna analyzer.
>   
    A balun wound on a toroid can have no more than 5% loss at 100 
Watts. Just relax and use your antenna. It might be hard to load on 40 
and 20 Meters but it should work ok.

73 Karl K5DI

> Any suggestions?
> 72s,
> Pete
> wd4lst
>
>
> Pete Axson
> WD4LST
> 17901 NE 18th Ave
> Citra, FL 32113
>
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