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There was an article in Radcom Microwave column a couple of years back showing how to modify a Franko Sat LNB board to produce a low noise front end for 5.7GHz .
I have one and it has around 1.5dB noise figure and 15dB gain , which would be a good start towards a TVTR.Followed by an ERA gaas Mod amp .
Evanescent filters are easy to make and will give you bandpass after the front end stage .
Build/buy a synth board to provide a lockable LO for TX/RX and bosh some i.f. passband filtering together .
Add a couple of mixer stages and some control system/sequencing and you are there .
The Birmingham lads (G8OHM) have/had PA modules at modest second hand prices for 8W output .
I would start with the RX and use the Beacons available locally to you (GB3OHM on .900 and GB3ZME on .910 +/-a few kHz ) .
Have added a 5.7GHz VE4MA to my 60cm 10GHz offset dish ,off boresight in the horizontal - seems to have little influence to the 10GHz LNB and just needs you to offset on your rotator readout .
Hope to use my Kune TVTR on EME next , after 24GHz tests .
It's just stopped raining !