Rick - I also had difficulty when I first attempted to put these to use. Similar to your problem, it was insertion loss. The unit I wanted to use had an LED display, and my other unit did not. I felt I had nothing to loose so I changed the YIG filter from the "plain Jane" unit to the one with the display, and low and behold it all worked fine. So, previously I was getting about 14 dB of insertion loss and now it is back to the nominal 7 dB. BTW as a consequence I do have a pair of those switches if you are convinced that is your problem. Regards - Mike
Mike B. Feher 89 Arnold Blvd. Howell, NJ, 07731 732-886-5960 -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Rick Karlquist Sent: Wednesday, January 04, 2006 7:52 PM To: Discussion of precise time and frequency measurement Cc: 'Discussion of precise time and frequency measurement' Subject: Re: [time-nuts] HP 8445B I have several of these, but the electromechanical relay contacts have become dirty on all of them. Is anyone familiar with rejuvenating them? Especially the idea of running a fairly high power RF signal through them and hot switching them to burn off the oxide. Rick N6RK Mike Feher wrote: > These tunable YIG filters are going for practically nothing on ebay. While > they only go to 18 GHz they make an excellent filter to follow testing of > an > LNA after the mixing process, for noise figure measurements, as an > example. > After all it is that noise that makes our time and frequency measurements > questionable. I am surprised that they typically go for around $50 or > less. > They are externally tunable with a voltage source that is proportional to > frequency. I bet a lot of you would be happy to own one. Regards - Mike > > > Mike B. Feher, N4FS > 89 Arnold Blvd. > Howell, NJ, 07731 > 732-886-5960 > > > > > > > _______________________________________________ > time-nuts mailing list > [email protected] > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > > _______________________________________________ time-nuts mailing list [email protected] https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts _______________________________________________ time-nuts mailing list [email protected] https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
