[R-390] R-390A Mechanical Filter replacement

[Bryce Ringwood]

Hi,

I have a 455kHz "Ferritronics" LC Filter ~16kHz bandwidth - This uses sever=
al coils wound on pot cores and is the same general size and shape of the R=
390 mechanical filters. For those of you contemplating that route, my (than=
kfully limted) experience of winding 455kHz IF transformers, adjusting the =
coupling and fiddling with a sweeper is that its very time-consuming indeed.

Apart from the windings at each end of a mechanical filter - how do they fa=
il ?  Are the Kokusai type which use piezo crystals as bad or worse ?

Just curious - Bryce


--=20
This message has been scanned for viruses and
dangerous content by MailScanner, and is
believed to be clean.
Mailscanner thanks transtec Computers for their support.