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Strange Polarity reception dilemma

Strange Polarity reception dilemma

Strange Polarity reception dilemma

(OP)
Sirs

Following a recent service call to a marine stabilised TVRO antenna, I experienced a strnage reception situation.
The C band feed assembly was linear and calibrated to receive CNN, TNT and CNBC on vertical polarity. This was working fine but ESPN was also reported to being vertically propogated but in order to receive ESPN through this feed I had to move the pol by 90 degs?
The line is only attached to the vertically polarised LNB but still this anomoly remains?

Please help if you can

Greatly appreciated

Mycroft

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