" Uncle Peter" ) writes:
"Michael A. Terrell" wrote in message
...
Gregg wrote:

Lafayette Radio used to sell them, but they are long gone. There
wasn't enough of a market for the knock offs, either.

Collins got on them regarding patent infringement issues.

Pete

I'd never given thought to that. Was it the concept of mechanical
filters that Collins had patented, or just a specific implementation?

SOmeone once wrote a receiver construction article, I think it was
in CQ, in the early sixties, that described how to make your own mechanical
filter. Despite the number of times I've mentioned that in the newsgroups,
I've yet to dig out the article.

Michael VE2BVW