[Drake] X-tal filters

[Rein A. Smit]

Hello All,

A few years ago I bought on a flea market 2 x-tal filters
made by Network Sciences in Phoenix.

The filters are marked: 5645-2.4L and 5645-2.4U

I assume they are upper and lower sideband filters out of
the Drake T4 series transmitters, not sure though.

I am looking for the specs of these filters, i.e. shape factor,
if possible Zi and Zo as well as the ultimate rejection.

As usual, did not hear from the manufacturer, they probably
do not made them any longer. But their present catalog shows
SSB filters in that range with rejections of 70 to 80 dB
what might indicate perhaps at least 8 poles?

I am also looking for a used 600 Hz CW filter ( CF600-6 )

73 Rein W6/PA0ZN

http://www.nitehawk.com/rasmit/r4c.html