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Author Topic: NEMP Rated surge arrestor  (Read 374 times)

Offline Josh

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NEMP Rated surge arrestor
« on: February 23, 2020, 0142 UTC »
IS-50NX-C1
SKU: IS-50NX-C1
$19.95
https://fairradio.com/product/is-50nx-c1/

I feel this is an excellent price for the amount of protection.
Keep in mind they ground the antenna side center conductor with an inductance while a cap isolates the rig side center conductor and a gas discharge pill protects the works.
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Offline NJQA

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Re: NEMP Rated surge arrestor
« Reply #1 on: February 23, 2020, 1246 UTC »
The frequency limits they show are real too.  I saw an installation where the installers used similar surge supressors for the HF antennas.  The antennas were dead as a door nail.  Replacing the supressors with ones rated for HF made everything good again.


Offline Josh

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Re: NEMP Rated surge arrestor
« Reply #2 on: February 23, 2020, 2111 UTC »
I've one rated for hf, works down to wwvb even. It must comprise a highpass of sorts as I can't see how it could pass vhf and up, but not hf.
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Offline NJQA

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Re: NEMP Rated surge arrestor
« Reply #3 on: February 24, 2020, 0301 UTC »
The isolation capacitor in series with the center conductor is large enough for VHF and higher, but not for HF.

Offline Josh

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Re: NEMP Rated surge arrestor
« Reply #4 on: February 24, 2020, 1937 UTC »
Kinda what was expecting, I also think the gas discharge pill doubles as the cap.
We do not encourage any radio operations contrary to regulations.