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using ferrite cores on coax cable

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ASAD

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Hi.
I'll be using a collinear antenna (Antenex) for >450 MHz. I was wondering if it's necessary at all to use ferrite cores around coax cable underneath the antenna to curb reflected power? Or should I coil the coax a couple times by the antenna? If I use Andrew Heliax, which doesn't bend, what do you do in this case?
 

prcguy

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I can't imagine a commercial VHF or UHF antenna not being adequately decoupled from the coax. You can usually test it by watching reflected power while running your hand up and down the coax near the base of the antenna and the reflected power should not change.
prcguy
 

cmdrwill

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The Antenex so-called co-liner antennas are just a J pole made with 19 gauge wire. Get your self a much better real antenna.

PRC guy IS correct, most real commercial antennas do not need decoupling.
 

SCPD

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Coiled

Hi.
I'll be using a collinear antenna (Antenex) for >450 MHz. I was wondering if it's necessary at all to use ferrite cores around coax cable underneath the antenna to curb reflected power? Or should I coil the coax a couple times by the antenna? If I use Andrew Heliax, which doesn't bend, what do you do in this case?
I've made a few homebrew co-linears and needed to have something to take the signal off the shield.
I prefer to coil the coax.
For UHF, I say about 4 or 5 six inch diameter loops.
Since your feedline won't bend, make a loop out of something like 8X, and put it between the antenna and the heliax.
 
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