It seemed that most of the LNBs had moved to single crystal boards, which was a disappointment to me as I like to leave a crystal on one output for DATV reception (low phase noise) whilst modifying the other output to accept an injected, stable LO for the NB transponder.
I have just found an Octagon LNB which has two outputs and two crystals. It is available on Ebay for £16.99 incl postage. https://www.ebay.co.uk/itm/Octagon-Gree ... 2749.l2649
Useful Octagon LNB
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