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 <[email protected]> To: Tom Boucher <[email protected]>; 160 reflector <[email protected]>; Chris G3SVL <[email protected]> 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" <[email protected]> To: "Tom Boucher" <[email protected]>; "160 reflector" <[email protected]> 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 > _______________________________________________ > Topband reflector - [email protected] > > > ----- > No virus found in this message. > Checked by AVG - www.avg.com > Version: 10.0.1427 / Virus Database: 2441/5369 - Release Date: 11/02/12 > _______________________________________________ Topband reflector - [email protected] _______________________________________________ Topband reflector - [email protected]
