Hi John I have a collection of filters but I have not seen any common ones at those frequencies with 50 ohm termination. The characteristic would probably require transformer input and output coupling, the inherent impedance of most filers in this frequency range will be around 1kohm. The narrower the lower the impedance.
Those crystal frequencies are available relatively cheaply it should be possible to make a ladder filter with some form of matching to 50 ohms quite simply. There are lots of references around (the recent QEX has on on overtone crystals, but does reference some of the articles on fundamental crystal filters.) Alan G3NYK ----- Original Message ----- From: "John Ackermann N8UR" <[email protected]> To: "Discussion of precise time and frequency measurement" <[email protected]> Sent: Monday, November 15, 2010 3:44 PM Subject: [time-nuts] 5 and 10 MHz crystal filters > I'd like to find a couple of 5.0 and/or 10.0 MHz crystal filters, > preferably configured for use in-line with 50 ohm coax. > > I've done some googling but don't find anyone selling these as a stock > item. Do they exist? Any pointers would be appreciated. Used/surplus > is fine (even preferable). > > Thanks! > > John > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
