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W7SX is ex-WN9RAT, WA9RAT, WA9RAT/HR2, and SV1/W7SX. Licensed since 1966, DXCC Honor Roll accomplished with only tree-supported wire antennas, CW DXCC Honor Roll, 2x5BDXCC (>200 on each band) + 160, 30, 17 and 12 meter DXCC, 5BWAZ (200) ARRL Life Member, ARRL Technical Advisor. e-mail: w7sx@arrl.net


My new book, "Antenna Physics, An Introduction" has been published by the ARRL. They are now taking orders at



I answer all QSLs via the bureau or direct. Please include SASE for direct, otherwise the return will go via the bureau. I still keep a paper log, but I answer all LOTW QSL requests. Simply send the request via e-mail and I will enter the QSO on LOTW if you are in the log. I do not participate in e-QSL.

My 6 meter beacon (W7SX/b) is on 50.071 MHz. 

Update: For this winter (2015/16) Sporatic-E season the beacon will be on and I will use the 5 element M2 Yagi at 40 feet. I will change the direcetion periodically. This should provide over 1 kw EIRP! I will attempt to point it in direction with the highest probability of openings (when I am home). When Spoartic E activity is low and/or during the night I usually point the antenna north in case 6m enthusiasts up the Willamette Valley and western Washington need a horizontal polarized signal for antenna calibration.

The transmitter output power is 85 watts and the power input to the antenna is about 70 watts. I must QRX beacon operation when operating on 6 meters, otherwise the beacon will be on continuously, except for upgrades and maintenance. I include a 5 second key-down CW signal for anyone who needs a stable ground-wave signal in Oregon/Washington  for antenna tuning and calibration. The line-up is a 28 MHz homebrew keyed exciter---- 6 meter transverter ----- Motorola PA

E-mail reports are most welcome.

This photo shows the complete operating position including two 6 foot racks containing two GS35b Russian triode 1.5kw homebrew amplifiers, one for 160-10 meters, the other a monoband 6 meter amp, wire antenna and tuner selectors, selector switches, and 8 high power tuners for instant QSY. The entire station is homebrew except for the K-3, four Johnson Matchboxes, and a rebuilt TH6DXX. Photo 2012, under renovation currently.

This photo shows the nearly-completed rebuild of the 160-10 meter GS35b amplifier (October 2015).

This photo shows the 6 meter GS35b (horizontal mount) amplifier under construction (2012).

This is a bottom view of the 160-10 meter amplifier nearly completed Oct 2015.

The homebrew 33 foot steel self-supporting tilt-over tower (design and welding by W7SX) with redesigned TH6DXX and a M2 6 meter Yagi. The tilt-over feature negates the climbing of the tower and makes for easy antenna adjustments on the ground. An automotive wench serves for raising and lowering the tower. 

This is the lowered position of the tilt-over tower. The permanent steel gin pole protrudes upward from the base. The tower base is fixed in 2 yards of concrete.

This is the backstay and automotive winch that raises and lowers the tower. It is bolted to a steel mount that is welded to rebar, which in turn is anchored in 1 yard of concrete.The car battery is charged by a burried cable that leads to the garage and a 3-stage charger continuously on. The battery also provides power to several external remote control and security devices. When not in use, a cover is placed over this assembly. The tower design could easily be extended to 45 feet or more.

In addition to the tower, I have a wire antenna farm for the low bands between 60 and 100 feet high supported by Douglas fir trees. This includes the Bob-Zepp for 160-80-40 meters described in the Nov-Dec 2014 and Jan-Feb 2015 QEX issues.



7042937 Last modified: 2016-01-28 19:20:21, 5745 bytes

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