[TowerTalk] Mains Filter for 80M

Jim Hargrave w5ifp at gvtc.com
Fri Jun 8 08:41:24 PDT 2012


I use an ISOBAR IB-4 dual stage line filter.
It is a combination noise and surge protector.
I don't have any literature for it, but a similiar filter is shown at:


Several different models are shown at:


The one I have is a dual stage and is rated: 1st stage - 50 db noise
rejection @ 1 Mhz. 2nd stage - 75 db.

I run all my computer and radio gear on this filter. However, I have
separate filtering for the linear amps.

These are usually available at computer and office stores. Not cheap, but
very effective and long lasting.

    73s de Jim

  > On 6/8/2012 6:20 PM, Wayne Willenberg wrote:
  > > I am putting up an 80M dipole at 65 ft and a Beverage antenna for
  > > receiving.  In doing my homework for this project, I have been reading
  > > ON4UN's book "Low-Band DXing."
  > >
  > > On page 7-75, the author states "It is essential to feed the
  > equipment at
  > > the shack through high-quality mains filters..."
  > >
  > > Would someone please give me a recommendation for such a
  > "mains filter"?

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