KL7UW


432 MHZ EME

  QRP Station:

  A DEMI L432-28 transverter kit has been built with the new VHF ApolLO PLL synthesizer.


  The 4.9m dish is being used which is equivalent in gain to four yagis.  Current feed is
  a two element quad in Horizontal polarity but a dual dipole H/V feed it planned for 
  summer 2012.    A 150w sspa has been purchased and will be mounted behind the 432
  feed antenna ground plane where TR and polarity relays and WA2ODO preamp wil be located.

  A modified dual-dipole, dual-polarity feed will be colated with the 1296-MHz feedhorn.
 
  Only JT65 operation will be used due to the small size of the antenna and coresponding 
  low EIRP.  There are no plans to expand to a full-sized EME station.
 
  In 2010 A Mirage D3010 (now sold) was temporarily installed at the dish in a Hoffman box.
  The 432 preamp and coax TR relay were moved from the satellite tower to the
  4.9m dish for use during the Arecibo 432 test.  A two-element quad feed antenna was 
  built for this and attached to the side of the 1296 septum feed.  The 432 preamp and Tx
  amplifier used the Tx and Rx coax lines run to the dish for 1296.  
 
  KP4AO (Arecibo) was received well in SSB at about 4-5 dB SNR, and JT-65B at about 6-8 dB
  SNR.  No contact was made with KP4AO.  
 
  Here are some photos:
 
  • Dish pointing at Moon at az=90, el=28
  • views of dual-quad feed
  • Photo of the amplifier enclosure behind dish
  • Views of the back of dish and 28-volt & 12-volt power supplies
  • Current views of the ham shack
  • The DVD player used to monitor the dish
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