Well, that made quite a difference! I removed the POTY from the QO100 dish today and replaced it with a ‘Bullseye 10kHz’ LNB sourced from Amazon and advertised as a ‘QO-100 Bullseye TCXO LNB’. It’s just clamped in place with no attention to position or skew. Winterhill plugged in and instantly I see pictures.
The LNB behind the POTY only managed negative values in the MER and D fields, this one seems too work rather well. No idea what happened to the old LNB but these things happen I guess. It’s dry and had a waterproof housing. I’ve used the existing CT125 cable and connectors. Now to put the Winterhill box in a better location than just sitting on a ladder tied on with a bit of wire!!
The above photo shows the Winterhill viewer and console on the left and the Quick Tune on the right, all working nicely.