[time-nuts] suggestions on getting 24 Mhz ?

Bob kb8tq kb8tq at n1k.org
Wed Apr 11 14:15:45 EDT 2018


Hi


> On Apr 11, 2018, at 12:11 PM, Graham / KE9H <ke9h.graham at gmail.com> wrote:
> 
> Phase noise is (usually) more important than absolute frequency accuracy.

It’s probably well worth looking into exactly what you are after in terms of phase noise, 
spurs, and stability *before* deciding on a solution. In some cases things like DDS spurs
are a non-issue. In other cases phase noise at certain offsets is a really big deal, but at
other offsets … it’s a non-issue. 

Bob


> 
> I suggest some kind of low phase noise master oscillator (OCXO) feeding a
> DDS without an internal multiplier.
> 
> If internal multiplier in DDS, that, rather than the frequency reference
> source will set the phase noise floor of the sampling.
> 
> --- Graham
> 
> ==
> 
> On Wed, Apr 11, 2018 at 11:00 AM, Jerry Hancock <jerry at hanler.com> wrote:
> 
>> For and RSP?  I used an HP 3325 locked to my Cs beam and took the signal
>> from the back.  I think I paid no more than $100 for the 3325a and one I
>> got for free.
>> 
>> Regards,
>> 
>> Jerry
>> 
>> 
>>> On Apr 11, 2018, at 4:49 AM, jsternmd at att.net wrote:
>>> 
>>> Leo Bodnar GPSDO - adjustable Low-jitter GPS-locked precision frequency
>> reference 400 Hz to 810 MHz .  He has a new one, single output for 99
>> british pounds.
>>> 
>>> Jerry NY2KW
>>> 
>>> -----Original Message-----
>>> From: time-nuts <time-nuts-bounces at febo.com> On Behalf Of Pete
>> Lancashire
>>> Sent: Wednesday, April 11, 2018 6:00 AM
>>> To: Discussion of precise time and frequency measurement <
>> time-nuts at febo.com>
>>> Subject: [time-nuts] suggestions on getting 24 Mhz ?
>>> 
>>> Needed for SDR project as external clock source.
>>> 
>>> -pete
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