Looks like I can beat that price, the SCLF or SXLP devices are $8.95 each. 73, Dick, W1KSZ -----Original Message----- >From: "Lux, James P" <james.p.lux@jpl.nasa.gov> >Sent: Jan 8, 2009 2:11 PM >To: Discussion of precise time and frequency measurement <time-nuts@febo.com> >Subject: Re: [time-nuts] 10 MHz Band-Pass Filter Needed > > > >James Lux, P.E. >Task Manager, SOMD Software Defined Radios >Flight Communications Systems Section >Jet Propulsion Laboratory >4800 Oak Grove Drive, Mail Stop 161-213 >Pasadena, CA, 91109 >+1(818)354-2075 phone >+1(818)393-6875 fax > >> -----Original Message----- >> From: time-nuts-bounces@febo.com >> [mailto:time-nuts-bounces@febo.com] On Behalf Of John Ackermann N8UR >> Sent: Thursday, January 08, 2009 10:30 AM >> To: danrae@verizon.net; Discussion of precise time and >> frequency measurement >> Subject: Re: [time-nuts] 10 MHz Band-Pass Filter Needed >> >> Dan Rae wrote: >> > Richard W. Solomon wrote: >> >> The GPSDO I want to use has an output rich in harmonics. In some >> >> cases that is good, but Murphy rules and in the application I have >> >> today, it is not good. >> >> >> >> I need a 10 MHz Band-Pass Filter, Bandwidth is not critical, >> >> something small with SMA connectors would be ideal, but I >> can live with BNC. >> >> >> >> Anyone have such a beast or know where I can get one ? I checked >> >> Mini-Circuits and choked on the price !! > >You mean the ever popular BBP-10.7 for $41? >Hard to beat that price for something comparable. > > >> >> >> >> >> > >> > Dick, it is really easy to build one. The wonderful (free!) filter >> > design program ELSIE will give you all the help you need. I would >> > have thought an hour or so with a couple of toroids would do the >> > trick. Even just a Low Pass filter would usually do to >> turn a square wave into a sine... >> >> It's actually much better to use an LPF than a bandpass >> filter if you don't have subharmonic energy to deal with. An >> LPF with a cutoff midway between the fundamental and the 2nd >> harmonic will show much less tempco (in the form of phase >> shift over temperature) than a bandpass filter. > >You might even be able to use some wonky little filter feedthrough with a suitable cutoff frequency. > >_______________________________________________ >time-nuts mailing list -- time-nuts@febo.com >To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >and follow the instructions there.