[Moon] 3.4GHz EME

[SAM JEWELL]

Folks
  Many thanks to all those who were on 3.4GHz. I had a really interesting and revealing weekend listening on 3.4GHz EME.
   
  Heard on 3400.050 / .075MHz were G3LTF, OK1CA, W5LUA, and LX1DB. Seen on Spectran and heard briefly, G4NNS. Only G3LTF and LX1DB would have been workable with my present rx system. G3LTF was 419 and LX1DB 529 (Moonbounce RST!).
   
   
  I am using an old ADL feed with 3 ring 'Chapparal' choke. The LNA is a modified 3400 - 4200MHz Samsonic 17k LNB. Only the LNA part is used with my DB6NT transverter.  I don't believe the 17k at 3400MHz claim!
  The dish is my 2.3m KTI prime focus.
  Polarisation is linear vertical at due south and skewed either side of transit due to the polar mount. A real case for circular polarisation whatever the merits or otherwise of circular polarisation!
   
  Moon noise was ~0.2dB. Sun noise started at 8.7dB but variously measured down to 8.0 over the weekend. Heavy rain bearing storm clouds and reduced SFI may be partially responsible. G3LQR reported similar reduced sun noise over the same period.
   
  It seems to me that a 'standard' C band horn feed of this type, with septum polariser and coaxial RX and TX ports would be a relatively easy way to produce an efficient feed for the band and the cost of the horn is hardly more than about 50UKP at present. At least most TVRO dishes are already able to accept the choke ring attachment method and the horn part of mine is already marked for different focal length dishes.
   
  I would like to include a short piece on the 3.4GHz EME activity session in my RSGB Radcom Microwave column for September.
   
  73 de Sam, G4DDK
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