K7FL VHF/UHF Beacon Page
|10 Meters||28.2985 MHz||10 Watts Output||Inverted vee antenna|
|6 Meters *||50.060 MHz||2.5 Watts Output||Inverted vee antenna|
|2 Meters||144.299 MHz||10 Watts Output||Stacked KB6KQ loops|
|1.25 Meters||222.050 MHz||15 Watts Output||Stacked KB6KQ loops|
|70 cm||432.301 MHz||50 Watts Output||Stacked KB6KQ loops|
* The 6M beacon is QRT between May 1 and August 1 (e-skip season)
The K7FL beacons make extensive use of the excellent Hamtronics transmitter boards. I've operated these boards for several years with only one in-use failure, which was likely caused by an antenna issue. The boards are quite capable of running the near continuous duty message sequences typical of beacon modes. Below is a picture of the 50, 144, 222 and 432 boards with supporting control circuitry.
The 28 MHz beacon transmitter is a Radio Shack HTX-100 with an N0XAS pico-keyer(tm) installed inside to generate the beacon CW message. The transmitter is rated at 25 watts, but I reduced the output to 10 Watts. I doubt the HTX-100 was designed for the rigors of 24 x 7 x 365 beacon service. I've received reception reports from all continents, proving when 28 MHz is open it doesn't take much power to be heard.
Two types of antennas are utilized at K7FL/B. The 432 MHz, 222 MHz and 144 MHz beacons each use two KB6KQ type loops. This type of antenna provides an omni directional signal pattern, and easily phased for increased gain. They are mounted 30 feet above the ground (~ 500 feet ASL). The 28 MHz and 50 MHz beacons feed inverted vees 20 feet above ground level. The pattern for the inverted vees is essentially omni directional.
BeaconhausBeaconhaus is the name of the storage shed with houses the beacon equipment and antennas. The name was inspired while traveling through Germany with my good friend Claudio, ET3VSC/IV3VSC. Entering small towns we often noticed a large pole with various symbols identifying tradesmen who can be found in town. Always alert to ideas for making stealth antennas, it didn't take long to dream of camouflaging my beacon antennas as a pole in a German village. Fortunately these stealth measures were not necessary, but the name stuck.
Beacon operators greatly appreciate reception reports from listeners. Please send an E-MAIL or QSL if you hear the beacons. I would be pleased to mail a QSL card in return. Current image is below.
PO Box 1555
Brush Prairie, Washington 98606
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