KL7UW
VHF/Microwave Beacon



  White Box Modification:

  Modification of a M/A "White Box" transverter has progressed with the project 95% complete.  The
  20 volt/-5 volt power supply and DEMI xvtr interface board (model TC) are installed in the cover of
  the original 55-vac power supply.  I made modifications to convert the TC into a simple sequencer
  with about 800 ms delay for application of Tx voltage after the Rx and coax relay are switched.
 
  I have the LO AFC modified and the xvtr modified to the point of tuning of the 10-GHz 3-pole receiver 
  filter and tune-up of the transmitter 2-pole filter.  I am hoping to achieve 100 mw output (or better).
  Here are some photos of the completed 12-vdc power supply/transceiver interface/sequencer:
 



 
 
 
 
 
 
 
 
 
 
 
 
 


 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
  This unit will serve as a 10-GHz loaner.  The station borrowing the "white box" will need to provide
  their own 2m-SSB transceiver.  With this I am hoping that others can try out narrow-band 
  microwave operation and be encouraged to get their own stations set up.
 
  For my own operation, I have a complete 10-GHz portable station comprising of a KX3, DEMI
  transverter, and a 2.5-watt DEMI power amplifier kit (to be built).  I have several antennas ranging
  from a small 17-dB horn, a large 22-dB horn, and several 18-inch dishes to a 2-foot dish.

  10 GHz Beacon:


  I've changed my mind about using the M/A White Box as a beacon (at home).  It will make a good
  loaner transverter so the beacon will be a little simpler.

  I am going to use a A32 synthesizer on 1152.020 MHz to drive a W1GHZ Multiplier amplified with a 
  Qualcom 1w amplifier.  It will only transmit a CW signal.  No remote control will be needed on
  445.450 MHz.

  The beacon installation will be on top of my 50-foot tower (BP40IQ).  That would provide a line-of-sight
  (LOS) path to many Anchorage "hill-side" locations and fair coverage over a 100-mile radius.  With many
  high mountain peaks ringing the Cook Inlet, there are several opportunities for reflection of the beacon
  over non-LOS paths.

  The IC-215 may be set up as a separate 2m beacon, as well.
 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 





  







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