"Al Lorona" ) writes:
Thank you for your responses. These filters were definitely from the very
early 70s or maybe mid- or late 70s. The guy who sold them to me at the swap
meet mentioned that they may have come out of a Cubic or Astro rig of that
era, but he wasn't sure and I just wondered if there was anybody here who
might be sure of that.

Thanks again, you guys.

Al W6LX

The name of the filter manufacturer that you mentioned, that did sound
like the company that made the Swan filters (Cubic and Astro came later
in the seventies, but my hazy memory connects them all together so I
think there is a connection). I remember ads (and a quick check
didn't find one) of them touting a really good filter made by
that company. But I'm pretty certain it was in the 5MHz range.

What does come to mind, maybe incorrectly, was that the Swan 250, the
six metre SSB rig, had a 10.7MHz IF, but I can't be bothered to check that.
I can't even remember why I would think that. But I can't see them going
to 10.9MHz.

I'm with the others, 10.9MHz is most likely a scanner (and I too would
say Regency). And if it's not that, then it's some non-amateur piece
of equipment. Not everything has to be for ham radio rigs, and I have
my share of oddball crystal filters that came from somewhere but
couldn't have been ham rigs.

Load the inputs and outputs down to some extent, and then use a sweep
generator to get a general idea of their bandwidth. If you're looking
for SSB-width filters, then they aren't useful if they were for FM
receivers.

Post the information printed on the filters, and maybe someone just
happens to know.

Michael VE2BVW