开云体育

I've been reading the comments recently on using CMC baluns on antenna systems and I too am a firm believer in using them. I've seen my noise level go down considerably in my semi-urban location.

My question has to do with using CMC balun over multiple antenna. I have a series of dipoles, 160/80/60 and 40m (on the boom of my TH11DX), and the TH11DX for 20/17/15/12/10 meters.
These are all fed to the rig via an automatic remote antenna switch at the base of the tower.

I have a CMC on the output of the antenna switch that's wound with 17 turns of RG-400 on a #31 - 2.4" core (with a crossover).
The problem, as I understand it, when using a balun like this (close windings) on the higher frequencies have capacitive leakage.

So, I was going to wind another CMC with fewer turns to cover the 14 - 29.7 MHz and build a remote relay switch (switching both the center and shields) between the two baluns, located at the base of the tower.
HOWEVER, it occurred to me that rather than switching between them, perhaps I could just put them in series. The series losses would be minimal (probably less than the relays that would be inserted), and hopefully, the inductive reactance between the two would add up, but also keep the reactance at the higher frequency much higher because of the addition of the CMC wound for the higher bands.

Does this make sense?

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Mike, W0IH

It's common practise so yes:

I found the reference in the Cookbook.
Thanks!

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Mike, W0IH