[time-nuts] GPSDO advice

[Bob kb8tq]

Hi


> On Apr 24, 2020, at 3:52 PM, Wes <wes at triconet.org> wrote:
> 
> Hi Bob,
> 
> Honestly, I don't have any particular holdover requirements in mind, just that it has some :-)  This is just one of those nutty things.  You must understand.
> 
> Wes  N7WS 

Ok, so what does the current setup do that you are not impressed by? I’m
asking mainly because a *lot* of this is a “make one thing worse to make 
another thing better” kind of process. Very accurate time ( = very close to 
the GNSS timestamp) is directly opposed to clean frequency. A box that is
“better” for time likely is “worse” for frequency. ( yes, some are pretty bad
at both …). 

A SRS 740 with the Rb option is one of the alternatives….. Pricing for all
the options is on their web site. 

Bob

> 
> 
> On 4/24/2020 10:14 AM, Bob kb8tq wrote:
>> Hi
>> 
>>> On Apr 24, 2020, at 12:56 PM, Wes <wes at triconet.org> wrote:
>>> 
>>> No, I'm not looking for advice on how to build one but what I might buy.  My need is strictly hobbyist (ham radio).  I currently have a Bodnar dual frequency unit, that gives me frequency and a TAPR, (Synergy Systems) that gives me 1 pps, but I would like something that gives me both, with better performance (holdover).
>> ….. holdover?
>> 
>> What are your holdover requirements and what drives them? That is likely to have a
>> significant impact on “what makes sense”. Holdover on most GPSDO’s is driven by
>> a network timing requirement ( X us over Y hours ….). Most basement lab needs are
>> not driven in the same fashion.
>> 
>>> The Jackson Lab FireFly-IIA
>> I’m sure a call to Jackson Labs will get you the current price on any of their products.
>> 
>> Bob
>> 
>>>   and the lookalike Symmetricom GPS-2500 both look interesting.  But, price and availability are elusive.  Any advice on these or alternatives will be appreciated.
>>> 
>>> Wes   N7WS
>>> 
>>> 
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> 
> 
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