Initial measurements with the new filters and an alternative PIN diode show a big improvement in dynamic range.
John has also provided some new and possibly better post mixer amplifier devices. I will be trying one of these devices over the next few days, together with some other changes.
IF all this works, as it should, then the result could be an outstanding performance from a small, low cost, 144/28MHz transverter.
One further item of news. The scaffolding, that has prevented my use of the 2.3m dish, has been removed as next door's extension comes towards completion. At last I can get back on 23cm EME. Weather permitting of course.......!
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