I measured the Comtek bead balun on 160m and found there is low choking
resistance.
I use the K9YC design with good results, whether it will make any
difference in your antenna system is something you will need to try.
With more than 5x the choking resistance with the K9YC 7T on 5 #31core
you may see a reduction in noise and feedline involvement. I use RG400
or RG142 TFE coax which can easily handle QRO on 160m and fits in a 4 x
4 x 4 PVC junction box. I haven't made any of the bifilar THHN designs.
Grant KZ1W
On 3/30/2018 4:22 AM, N2TK, Tony wrote:
I shunt feed my tower for Topband. Presently using a Comtek 100 bead balun.
After reading K9YC's article on baluns it would seem that a stack of five
#31 cores with 7 turns of coax would be a better balun.
Would I notice an improvement in any way by switching baluns?
If the answer is I would notice an improvement what about using sixteen
turns #12 THHN wire on #31 core as shown in K9YC's article? How many cores
would I need for 1500W?
Tnx for any feedback
N2TK, Tony
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