[600MRG] Modifying a MFJ259C

[Edward R Cole]

Robert,

That is problem using wide-band test equipment.  I am lucky that the 
nearest AM station (920-KHz) is 15 miles distant and apparently not a 
problem.  However, I have RGPS station on 310-KHz that is only 3mi 
away and presents a carrier at -30 dBm on my antenna.  Didn't appear 
it was a problem, either.

I was able to measure the R of my antenna at 20-ohms and was able to 
tune my base loading coil for zero reactance.  This was verified by a 
good SWR on the coax 100-foot+ away in the shack and an RF ammeter 
reading of 1.4A at 100w RF output.  50-ohm matching was done by 
tapping coils near ground end of the base loading coil.

I wonder if one were to use one of the BC band filters (Clifton Labs 
Z10020) if that would suppress BC overload?  The filter removes all 
signals above 600-KHz for me (550 comes thru at a very reduced power 
of -100 dBm from a station 70-miles north of me).
73, Ed - KL7UW

At 04:36 PM 6/1/2015, Robert Roehrig wrote:
>I have a 259 and installed the LF mod. ButI find it useless to check 
>the antenna. I am guessing it is overloaded by nearby broadcast 
>stations. I wonder what luck others have had.
>
>
>
>      On Monday, June 1, 2015 6:05 PM, Dick Bingham 
> <dick.bingham at gmail.com> wrote:
>
>
>  Hello folks
>
>I have been tempted to buy one of the MFJ259C Impedance Analyzers and have
>heard some folks have a 'mod' to get it to work at 630-meters.
>
>Is this true that there IS a modification to extend the low-frequency range
>a bit. If so, I'll buy one and get busy working on some antennas . . .
>
>73 Dick/w7wkr and wb2xsh-26 at CN98pi
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73, Ed - KL7UW
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