That appears to me, to be a C-band ONLY LNBF. It couldn't have been used for the sats you mention, as they are KU circular. You can buy new lnbf's of this sort for less than $40, so why even bother with it?
I'd love to have a 1.8M Channel Master dish, those are very desirable! Mount a modern C or Ku-Band LNB(F) and have fun!
I am not going to use it, as it also has a rather thick neck (about 62mm) .
What's it look like inside the throat? One or two probes?? Picture?
I think SatelliteAV called theirs the C1 (I think)
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