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KE7LWW USA flag USA

SILENT KEY SILENT KEY

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QSL: SK April 10, 2015

Ham Member Lookups: 14080

 

SILENT KEY

 

 

 

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.

 

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6184677 Last modified: 2015-07-16 00:22:16, 1867 bytes

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World Continents Award#5133
Granted: 2015-02-21 21:50:44   (KE7LWW)

Endorsements:
  • 10 Meters Mixed
  • 17 Meters Mixed
  • 20 Meters Mixed
United States Award#716
Granted: 2015-02-21 21:50:41   (KE7LWW)

Endorsements:
  • 20 Meters Mixed
Grid Squared Award#4267
Granted: 2015-02-21 21:50:37   (KE7LWW)

Endorsements:
  • 10 Meters Mixed
  • 20 Meters Mixed
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