[time-nuts] 10 MHz Band-Pass Filter Needed

Richard W. Solomon w1ksz at earthlink.net
Thu Jan 8 14:33:02 EST 2009


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 at jpl.nasa.gov>
>Sent: Jan 8, 2009 2:11 PM
>To: Discussion of precise time and frequency measurement <time-nuts at 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 at febo.com
>> [mailto:time-nuts-bounces at febo.com] On Behalf Of John Ackermann N8UR
>> Sent: Thursday, January 08, 2009 10:30 AM
>> To: danrae at 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.
>
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