On Sat, 22 Jan 2005 08:05:08 EST, BobK8IA@aol.com wrote:
>I have been evaluating a MFJ-1026
I've played with a similar product, the ANC-4, here at my very noisy
Chicago QTH. My observations are pretty much the same as Bob's -- it
can help with a single source, but you need a decent noise-sense
antenna and the balancing act needs continuous attention. None of
this is at all surprising -- it's inherent in the design concept.
The relatively early version of the ANC-4 that I have has a serious
problem with fundamental overload by local broadcast stations with
any significant length of wire attached, which also limits its
usefullness. Later versions added a front end filter.
BTW -- these units can also be used to null individual birdies from
sources like the local oscillators in radios and similar trash. The
problem I have here is literally hundreds (or even thousands) of
sources, so the best I can do is choose the most obnoxious and try
to kill it. Occasionally it helps enough to improve copy a bit.
Another use for these boxes is as a way to bring a separate receive
antenna into a receiver that lacks a separate receive antenna input
(like my TS850).
Jim Brown K9YC
See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless Weather
Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any questions
and ask for Sherman, W2FLA.
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