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K4KYV USA flag USA

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Hard-Core AM... 

Licensed since 1959, Extra Class since 1963. Primary modes AM phone approx 95% and CW approx 5%. No ssb capability.

Station consists of two homebrew tube type transmitters, plus a converted AM broadcast transmitter (160m only): a highly modified Gates BC1-T transmitter with transplanted Raytheon RA-1000 audio section. Each transmitter runs class-C final, plate modulated with  class-B modulator. Receiver is a Collins 75A-4 equipped with instantly selectable additional mechanical filters,  Sherwood SE-3 synchronous detector, and outboard audio amplifier feeding a broadcast studio bass-reflex monitor speaker.

Numerous transmitting and receiving antennas on country acreage, including full size series-fed 160m quarter-wave Vertical-Tee using base-insulated Rohn 25G tower with extensive buried ground radial system. Tower is 127' high, with 137' long doublet attached at the 119' level which also provides horizontal top loading for the vertical. Doublet averages 110' high, using the tower and two wooden poles 400' away from the tower in each direction as supports, with ends attached using lengths of Phillystran plastic cable. Transmission line to doublet uses open wire tuned feeders; doublet is usable as a half-wave dipole on 75/80m, quarter-wave dipole on 160m, and double-zepp (aka two half-waves in phase) on 40m, with final stages of each transmitter output network ending up in a separate link-coupled balanced tuned circuit for each band. All transmitting antenna feed lines employ home made open wire line, 440 ohm Zo. Matched balanced transmission line (no standing waves) from shack to the final stages of transmitter output networks, located in an enclosure at the base of the tower. Not a sprig of coax anywhere in the entire transmitting antenna system, from PA tube plates to radiating element of the antenna.

Additional receiving antennas include 400-900 ft. (depending on farming season) receiving Beverage pointing north-northeast and terminated with resistor at far end, plus indoor 160m rotatable loop.

10m rig is Eico 720 and highly modified 730 modulator, feeding quarter wave ground plane. The 10m set-up hasn't been used this sunspot cycle.

Photo is more than 10 years old and numerous changes have been made in the shack, but the equipment shown is still in use. Will update the photo one of these days.

CU on 160, 80/75 and 40.

 

Don k4kyv

 

 

 

7875362 Last modified: 2017-02-03 17:03:03, 2588 bytes

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