Topband: Antenna analysers in close proximity to BC station.

[Russ Tobolic]

I have a 2KW ERP station at 1480KHz 1.5 mi north of me and a 20KW ERP at 1300 KHz south of me .  With that combination my MFJ-259B is TOTALLY useless on 160.  I bought the $100 MFJ-731 filter and the 259B was then "almost" TOTALLY useless.  Wrapping a $100 bill around my vertical's base loading would have had the same effect. The MFJ filter is now good at attracting dust on the shelf for the last 5 years.  Now using the LP-100 which works fine.

Russ, N3CO

________________________________
 From: ZR <zr at jeremy.mv.com>
To: Tom Boucher <tom at telemetry.demon.co.uk>; 160 reflector <topband at contesting.com>; Chris G3SVL <Chris at G3SVL.com> 
Sent: Friday, November 2, 2012 8:11 PM
Subject: Re: Topband: Antenna analysers in close proximity to BC  station.
 
MFJ sells a filter for that but I dont know how well it works around serious BCB RF; 10KW at the high end of the band in 2 directions in about 7-8 miles doesnt bother my unfiltered 259B nor do the FM and UHF TV sites about 2 miles away.

Carl
KM1H




----- Original Message ----- From: "Chris G3SVL" <Chris at G3SVL.com>
To: "Tom Boucher" <tom at telemetry.demon.co.uk>; "160 reflector" <topband at contesting.com>
Sent: Friday, November 02, 2012 6:42 PM
Subject: Re: Topband: Antenna analysers in close proximity to BC station.


> At 21:21 02/11/2012, Tom Boucher wrote:
>> ...... but how to use the antenna analyser in the presence of a high BC station field. Anyone any ideas?
> 
> Hi Tom,
> 
> I have 2.4KW of MW BC transmitter 300m from the base of my 160m antenna, so I know the problem.  I've found an ICE BC filter to be pretty good - but I've only ever used it to tweak a matching system, not to take absolute readings.
> 
> I've used a loaned N8LP LP100A and that worked fine - but of course that's an entirely different measurement system.
> 
> 73 Chris, G3SVL
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