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3733 shematic, helixpolarization

Has anybody a shematic of the 3733 downconverter from transystem? Is a
filter modification necessary, or will it work with - a bit higher NF -
without? When I use a helix feeder for a dish, has the helix to be RHCP or
LHCP - I think RHCP is correct - ?
Thanks in advance
Albrecht DF9LC

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