This is, really, a very common topic here. The praises heaped upon
expensive "BalUns" comes at the cost for simple ferrite plus rather
stiff prices added for advertising and the illusion of worth.

Simply take common garden variety ferrite cores and stack them up on a
12" length of RG-58. Very simple: one gozinta and one comesoutta.
This alone will quiet noisy receivers, remove RF potentials on the
case, cure rigs of instability; and make sprinklers and touch lamps
settle down.

Consult the archives for 1:1 BalUns, ferrite chokes, et. al. to
research the nuances of which ferrite you should use (or simply build
the conventional coiled coax choke).

73's
Richard Clark, KB7QHC

=============================

- - - - and if your antenna or feedline is balanced, just get a ferrite
ring, about 2" in diameter, and wind on it a dozen or so turns of 18 or 20
gauge, twin, stranded, flexible, Radio-Shack speaker cable.

Transmission loss is sensibly zero. Just keep length of cable on the ring
less than 1/10 th of free-space wavelength at the highest frequency of
interest to avoid sprurious responses.

It's about time great, heavy, hanks of coax were removed from the handbooks.
Ferrites have been around for at least 50 years. But I suppose authors must
have SOMETHING to write about. ;o)
---
Reg.