K6ATZ 6m LFAK6ATZ


Welcome to Amateur Radio Station K6ATZ  •  ex KQ6MM, KD6ALY and WN2SWQ  •  First licensed 1973, relicensed 1991
QTH Cupertino, CA USA  •  Santa Clara County   ARRL Section SCV   CA QSO Party SCLA  •  CQ3   ITU6   Grid CM87xh



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Antenna project articles
  MA-40 tubular tower
  Farm 3: slanted roof
  Farm 2: flat roof
  Flagpole antenna
  AEA Halo-6 Loop
  Farm 1: peaked roof «

Cabrillo contest log info
  California QSO Party

Shack software
  DXLab New site
  DX Atlas New site
  WSJT-X New site
  JT-Alert New site
  Contest Log Checker New site
  Romac Equalizer New site
  CW Skimmer New site
  CW Decoder New site

Ham sites I depend on
  Contest Calendar New site
  QRZ.com New site
  eHam.net New site
  LoTW New site
  eQSL New site

 

Antenna Farm I

The VHF/UHF antennas above have served me well in many contests, emergency drills and casual QSOs.

The M2 EB-144 and EB-432 eggbeaters are primarily for full-duplex satellite QSOs, with 160W and 100W amps.

Their radials are intended to help focus RF upward towards the birds, but I've not found any need to remove the radials for earthbound work. The little 'beaters put out a fine omnidirectional horizontally polarized groundwave signal, from Silicon Valley to the Sierra foothills.

The AEA Halo 6 offers great six meter local, groundwave and E-layer propagation across the continent. It has approximately 200 Khz bandwidth and can handle up to 750 watts.

I purchased two on closeout intending to stack them for gain, but so far have been happy with the performance of just one. Click here if you need the Halo 6 Assembly Instructions.

The Diamond X-200A is used mostly for local 2 meter and 70 cm FM repeaters, and a bit of PSK-31. It replaced a Hustler which fried when I accidentally tried out a radio that put out over 100 watts.

The Diamond is rated for 200 watts and handles signals from my 160 watt amplifier just fine. (And, I keep the power down to the minimum necessary 5 watts or less on local repeaters, boys and girls.)

My homebrew "flagpole" vertical, shown above, performs really well for what it is. See "An Icom AH-4, PVC, and Some Wire: a Great Flagpole Antenna!" for construction and performance details.

The SD-40 dipole is oriented North-South. It of course out-does any vertical on forty meters when used as intended. It hangs at about 35 feet, for regional rag-chewing (Southern California to Oregon) and local Silicon Valley net omnidirectionality. Although it often hears DX like Japan better than the vertical, on most DX hops beginning at Washington State I need to switch to the vertical. DX requires more height for a lower takeoff angle. See AA3RL's helpful EZNEC analysis of this.

The additional ten meter dipole wire hasn't been tested much due to the sunspot low, but it is useful to have both vertical and horizontal antennas available for the local "Charlie 10 @ 9 Net", Wednesdays at 9PM on 28.350 Mhz.

I've always thought that adding a big top-hat to the HF vertical would really improve low-band performance. Also I may attempt to hang a higher dipole. If I succeed at any of the above, I'll post it here. In the meantime, thanks for visiting and feel free to look around.



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"You see, wire telegraph is a kind of a very, very long cat. You pull his tail in New York and his head is meowing in Los Angeles. Do you understand this? And radio operates exactly the same way: you send signals here, they receive them there. The only difference is that there is no cat." — Albert Einstein