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Re[2]: LF: Can LF damage a mains input filter?

To: Lawrence Galea <[email protected]>
Subject: Re[2]: LF: Can LF damage a mains input filter?
From: Chris Wilson <[email protected]>
Date: Sat, 21 May 2016 17:56:08 +0100
In-reply-to: <[email protected]om>
Organization: Gatesgarth Developments
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Hello Lawrence,

Thursday, May 19, 2016

Thanks  to  all  for  some great ideas and help. Time has precluded me
from  tearing  the  original  amp  /  slitter  apart, but fitting anew
Labgear  brand  one  immediately  cured the problem, and i have to say
that I suspect my LF activity killed it, either down the mains or down
the  feeder.  I  like the idea of a dish and a satellite feed, as does
`er indoors as she seems desperate to set up yet another direct debit,
this time in favour of Sky TV :(

The  inductor across the input sounds a good idea, and I may use it. I
will  perhaps have a play with my (expensively) fixed SA and tracking
gen to see how one works on the bench, and learn something, hopefully.

Next  time  I  am  LF'ing  I will add a transformer before the loading
coil,  even though I get a very good match without one, in the hope it
will  keep  RF  off  the  feedline  and out of the shack. For now I am
getting  no grief off the wife, at least not about the TV going on the
blink, so my thanks again to you all.

Best regards,
 Chris  2E0ILY                          mailto:[email protected]

 My part time LF grabber is at

> Hello Chris.
> Apart from the suggestions from others, I would suggest a small 1.5 -
> 2 turn link right across the input of the amplifier. You could wind it
> on say a 2mm twist drill for size. Such a coil would present a
> reasonable impedance to the UHF TV signals but would effectively be a
> short circuit for HF and lower VHF signals, shorting them to earth at
> the amplifier input. and prevent saturation of the amplifier with your
> transmitter signals.
> Regards
> Lawrence

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