[time-nuts] GPSDO advice
Bob kb8tq
kb8tq at n1k.org
Fri Apr 24 20:20:43 UTC 2020
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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