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Hello, welcome to my personal web page - thank you QRZ for this wonderful feature.

Originally licensed in KC MO in 1950 at age 12.  Retired from a 40 year computer programming career in 2003, but programming is still a favorite pastime.  Operate 99% HF CW (SSB to chase ATNO if not on CW).  DXCC 325 cfmd.

After 10 years, on July 27th 2017, K4DSP NC 12M QSO completed LOTW confirmed 8 Band WAS.

Now planning a 160M "T" antenna to chase WAS and DXCC on the Top Band.  This is a very interesting antenna from the 1920s that only requires 110' of horizontal space.  All of the radiation is from one or two vertical wires - very little radiation from the horizontal top hat wire.  Properly installed, 2 to 4 times as much current flows in the vertical wire - 3 to 6 DB more than other monopole verticals.  See Wikipedia description.

Home Brew 80M through 10M No-Tuner Antenna System:

Two doublets cut for 40m are hung at right angles to each other at nearly the same 70' height and fed with 600 ohm open wire line.  To get 80m coverage I added a 35' pigtail wire drooping vertically from each end of one of the doublets.  A single computer click switches between the two antennas.  This compensates for most of the nulls in the radiation patterns of multi-band doublets (especially when operating on bands above the fundamental antenna frequency).  This often brings a Q2 signal up to Q5 and occasionally produces a signal not even present on the alternate doublet.  The antenna control software is "smart" enough to automatically switch to the best doublet for the heading of a specified callsign.

Home Brew Antenna Feedline Matching System made possible by:

  • the programmability of the FT-100D CAT interface
  • the marvelous properties of open wire fed doublets which can be matched "merely" by adjusting the feedline length
  • home brew Logger / Antenna Matching Control program

The next photo shows my antenna feedline matching relays.  The Logger Antenna Matching Control program contains a map of the HF operating frequencies in 10khz decade divisions.  Each decade contains the number of feet to add to the feedline for a match on that frequency.  Radio frequency changes are detected by the control program which looks at the frequency map and, if it has already been calculated, automatically sets the proper feedline length for lowest swr for the current operating freqency and selected doublet antenna by selectively energizing relays to insert from 0 to 45 feet of feedline in any combination of 20', 10', 8', 4', 2', and 1' feedline sections into the feeder for the selected antenna. The  lengths of feedline are stowed on the wall above the relays.  If the feedline matching length has not been calculated for a frequency decade,  the calculation is made and stored in the map.

Nightly, the Logger automatically backs up the system, uploads the latest qsos to LOTW, and queries LOTW for new QSL confirmations.  The automation was a real headache to implement but I'm elated that I never have to do any more of the manual LOTW interface management.  It does a "zillion" other things as it has evolved since I first started it in 1993, many of them have nothing to do with ham radio - like tracking daily weight, calorie intake, and exercize minutes.

Commercial Station equipment:

  • LogiKey K3 keyer
  • Bencher Paddle
  • RoboKit parallel port relay driver
  • 1:1 Current Balun
  • FT-100D xcvr -  In use since 2005 when my TS140s failed mid-qso with a ham who subsequently sent me the FT-100D as a gift.  His generousity has kept me on the air to this day and enabled me to increase my dxcc count from 104 to 325.

 

When we moved from Woodstock, GA to Dallas, GA Oct 1st 2016, the original antenna feedline length matching relay board didn't survive the trip and was rebuilt to use a separate bank of relays for each side ot the feedline.  This, and better relays, provided more spacing between relay contacts.  Also, moved the RoboKit parallel port I/O relay driver to the relay board.  The 600 ohm open wire feedlines for my two doublet antennas come in at the left and the desired antenna is selected by a relay and routed through the two banks of relays which insert selected lengths of 450 ohm ladder line segments to accomplish the feedline length adjustments to match the selected antenna.  The optimized length of feedline exits at the right side of the board and connects to a 10KW Current Balun to transition from balanced to unbalanced coax to the FT-100D rig.

Previous Woodstock, GA qth shows the initial versions of my antenna feedline matching system and 65cm exercize ball seat.

2015 photo of me and my Swedish Trophy wife since 1979

This is the Doberman pup that distorts my cw now and then when she head butts my exercize ball seat.

My other hobby since 1960 - rated just under 3.5 and improving ever so slowly

The only picture I have of my station at age 12 in KC MO in 1950 - RME-45 rcvr.

 

8449190 Last modified: 2017-11-12 19:27:00, 6255 bytes

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