Topband: Help needed: Windom & MFJ-259B measurements

W2pm at aol.com W2pm at aol.com
Fri Jul 23 10:13:43 EDT 2004


Not sure what your specific readings are based on the message, however, since 
you have an imbalanced antenna you are likely going to get feedline radiation 
greatly affecting any measurement indication. Using a balun is of course 
essential on this antenna but it will still not remove all feedline radiation 
unless you take great care.  If you are reading 0 (zero) reactance however I'd 
think something is radically wrong with the 259B and I recall having a problem 
like that on one of mine several years ago.

In a message dated 7/23/2004 8:26:01 AM Eastern Daylight Time, DL1AMQ at web.de 
writes:
I wonder if my MFJ-measurements on TopBand-Windom (FD4, off center fed 
dipole, ...) are correct. How the results should be while checking both resonance 
frequency (advanced mode => X=0 ) and impedance (normal mode).

I measured at the feed point both with/without Baluns (1:1; 1:4; 1:6) without 
getting an clear indication of resonance frequency, harmonic frequencies and 
inpedanz. How to do it correctly ?


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