[time-nuts] Which First GPSDO to buy?
Bob Camp
kb8tq at n1k.org
Sat Dec 13 00:45:34 UTC 2014
Hi
A couple of differences:
1) The Lucent is a two box system, the GPSTM is a single box
2) The GPSTM is 1/2 of an operating pair. The Lucent ($150 version) is a full pair.
3) Both units are “fixed coefficient” boxes. Neither one can be modified (the way a T Bolt can).
4) The GPSTM works with Lady Heather. The Lucent works (sort of) with Z38x
5) The ADEV (stability) of the Lucent is better than the GPSTM. I posted plots of both about a month ago.
6) The Lucent’s are “new in box / old stock”. The GPSTM’s are surplus / salvage parts.
7) The GPSTM has a “pulse every 2 seconds” output. The Lucent puts out a PPS. The pps is much more useful.
A few similarities:
1) The samples of both devices I have seen have worked well. My GPSTM’s came from a US seller.
2) Both units were designed for cell tower service. Neither one is designed as a frequency standard.
3) Both run off an external DC supply.
4) The GPSTM has a bunch of fairly useless outputs at cell phone data rates. The Lucent has a 15 MHz output.
5) Both boxes have a 10 MHz output.
Of the two, at the moment, the Lucent is the better buy.
Bob
> On Dec 12, 2014, at 6:20 PM, Dave Daniel <kc0wjn at gmail.com> wrote:
>
> All,
>
> As a relative newcomer to this list, I have been reading the posts concerning GPSDOs. I have what I hope is a simple question.
>
> For a newcomer to this field, which GPSDO would be better to purchase as a first-time acquisition:
>
> - This "LUCENT/SYMMETRICOM Z3810AS, KS24361 L101/L102, HP-KIO OEM GPSDO TIMING SYSTEM", eBay item 321560316836, or
>
> - This "Nortel Trimble NTBW50AA GPSTM 10MHz Oscillator GPSDO + Antenna &Acc. Thunderbolt", eBay item 301434579384
>
> I am looking for a reference for my lab. Experimentation with GPSDOs will come later.
>
> Thanks
> DaveD
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