Wednesday, April 22, 2015

John "Long White Whiskers" [KE7LWW] -- SK (April 10, 2015)

John [KE7LWW], we will miss you.
You always had great stories from your QTH in Sherwood Forest (Bellevue)!
John got his General ticket in Spring 2013,
so he could chase DX on the Terminator
from the conduit antenna on his house's roof ridge.
-- John became a Silent Key (SK) last Friday, April 10, 2015 --
(Thanks Zac [K7ZAC] for the update)

FROM John's page:
Station KE7LWW is comprised of:
  • Ten-Tec model 708A desktop mic
  • Ten-Tec model 715 RF Speech Processor
  • Ten-Tec model 599AT Eagle Transceiver w/auto tuner, noise blanker, 1.8, 2.4, and 15 kHz filters
  • Ameritron AL-811H amplifier
  • MFJ-962D Versatuner III tuner
  • Vertizontal 20-10 antenna
Vertizontal 20-10 antenna
Station KE7LWW transmits out of criss-crossed coax cable as shown below. Each of the two elements is three-eighths wave centered on 14.268 Mhz. The two pieces are crossed at the one-third point (1/8th wave). The coax shielding is utilized as the radiating element in the criss-crossed members. The coax center wire is NOT in direct electrical contact with the coax shielding, nor is it fed a signal from the feed-line. Period. So the Ohm rating of the antenna coax is not important at all, and I prefer 75 Ohm TV stuff because of it's non-braided shielding and it's free - abandoned and stapled to walls everywhere! The feed-line is 50 Ohm, the best quality always preferred. I prently use a "very dirty" balun: five loops of coax about 5-1/4" in diameter per loop (see photo below...).
Don't use published coax velocity factors in the criss-crossed element design... remember: only the coax exterior shielding is fed the signal! I use 95% efficiency for the elements, although the efficiency is probably higher. This antenna is 1:1 across 20 meters and tunes-up very well on 17, 15, 12, and 10.
[Right click to enlarge]

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Winter at KE7LWW
The view from station KE7LWW...
Click on the photo for Hawaiian language and cultural information.
73 1625854 Last modified: 2015-01-21 18:03:58, 3678 bytes

Posted at 4/12/2015 09:20 PM