Sunday 20 October 2013

Back on 144 MHz EME

As the weather was good this weekend I took some time to finish off the 144 medium sized array. 

This is a temporary array to allow me to work on 2M EME from the small tower until we move and get my 18M HD tower up with the 4 X 14 XPOL yagis up. 

This smaller array is made up of 4 x 10 ele G4CQM AOWA yagis (144NX10) - these are low temperature but still great gain on a compact 5M length boom. They have about 12.3 dB gain each - so around 18 dB for a stack of 4 - that's not bad considering its only 1.5 dB down on the bigger yagis! 

I fed the 4 yagis using a RFHamdesign 4 way power divider and added in an HA8ET CONTEST-2 contest grade mast head preamp. 

The array is mounted on a small 4.5M high tower section which had the big dish on it at the old place. 

The whole array is steered by a SPID AZ-EL rotator. Putting the array together was easy enough and just a couple of issues that had to be ironed out. 

Now I will plumb in the IC9100 and the SSPA and run up some RF and do some echo testing.  

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