[50mhz] Modifying Cushcraft A50-5S

[John Kemker]

Jonesy W3DHJ wrote:
> Turns out it was too thin for that purpose ........
>   
>
> There HAS GOT to be a 'story' there!   HI!HI!
>
> Jonesy
>   
Yeah, he couldn't cut the threads in it.  Too thin for snap ring 
closures and too thin to cut threads that would hold up to the pressure.

Just finished measuring the SWR using an MFJ-259B.  1.1:1 from 50.090 
MHz. to 50.200 MHz.  Better than 2:1 all the way up to 51.00 MHz.  I'm a 
happy camper, as my rig's auto-tuner will tune anywhere else in the band 
I might wish to work.  Put a six-turn air-choke balun near the feed 
point to keep stray currents off the coax shield and out of the 
rotator.  (Prior experience with the A50-5S taught me that one.)  When 
it goes up, it will be at the top of a 50 ft. tower with a 15ft. mast 
about 120 ft. from the house with LDF5-50 (7/8" Heliax) from the top of 
the tower all the way to the grounding panel, with LMR-400 to take it 
the last 15ft. into the shack.

Temporary installation is about 20 ft. up on two sections of Rohn 25G 
attached to the house.

-- 
--JohnK
73 de W5NNH
10X 75371/M&M 117/SMIRK 6185/Six Club 285/TRA 2499/Norcross 228 F&AM




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