Topband: Short Receive Antennas

[Jerry Keller]

Talking about "noise cancelling", what about the MFJ-1025 which claims to provide a "60 db null to 
wipe out noise and QRM" using a separate external receive antenna (maybe a beverage or a small 
loop??). It even has an "RF sense T/R switch" that "automatically bypasses the receiver when 
transmitting".
Has anyone tried one of these things? Does it work at all?

73, Jerry K3BZ

----- Original Message ----- 
From: "Donald Chester" <k4kyv at hotmail.com>
To: <Topband at contesting.com>
Sent: Sunday, December 12, 2004 2:49 PM
Subject: Re: Topband: Short Receive Antennas


> 
>>You might want to look at an article in QST by K6STI, who
>>experimented/made a "noise-cancelling" antenna. It was
>>a wire antenna, 25 or more feet on a side, with open wire feed
>>lines from two opposing corners that went to a center pole and
>>box with a matching xfmr, etc.  One of the feed lines was twisted 180 deg
>>to cancel local noise signals.  QST article was Sep 1995, page 33.
>>and pages following....might be worth a look.
> 
> I built one of those a few years ago, and still have it.  While it 
> occasionally provides better reception than my other antennas, most of the 
> time its performance is disappointing.  I pretty much consider mine wasted 
> effort.
> 
> 
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