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

[Steve Rooke]

2009/1/9 Bruce Griffiths <bruce.griffiths at xtra.co.nz>:
> A crystal filter may not be a good choice for phase stability unless an
> oven is used.
> Some of the older frequency standards used crystal filters within an
> oven to cleanup the output signal.

There is the other issue of xtal jumps occuring randomly (?) which
could cause rapid phase changes.

73, Steve

> The limited crystal dissipation as may raise the phase noise floor of a
> low noise OCXO significantly.
> The implementation shown in AN9815 is particularly poor in this respect.
>
> A low Q resonant LC filter using low tempco components will have greater
> phase stability.
> Whilst obtaining capacitors with relatively low tempcos is relatively
> easy, the tempco of most off the shelf inductors is usually unspecified.
>
> The significance of the increased phase instability and /or raised phase
> noise floor depends on the application.
> If one is multiplying the output to 10GHz then even minor temperature
> fluctuations will be a concern.
>
> Bruce
>
> Darrell Robinson wrote:
>> If you're simply looking for purity of signal maybe a crystal filter.
>>
>> Intersil application note AN9815 is interesting.
>>
>> Darrell
>>
>>
>> ----- Original Message -----
>> From: "Richard W. Solomon" <w1ksz at earthlink.net>
>> To: <time-nuts at febo.com>
>> Sent: Thursday, January 08, 2009 10:11 AM
>> Subject: [time-nuts] 10 MHz Band-Pass Filter Needed
>>
>>
>>
>>> 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 !!
>>>
>>> Thanks, Dick, W1KSZ
>>>
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>>
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>
>
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-- 
Steve Rooke - ZL3TUV & G8KVD & JAKDTTNW
Omnium finis imminet