[Elecraft] FS GPS DO

[George Dubovsky]

The unit in question is a Trimble Thunderbolt GPS -disciplined 10 MHz
oscillator. They are removed from last-generation E911 location equipment
manufactured by Andrew Corp in Lynchburg, VA (my employer). A ton of them
were surplussed out and wound up in the far East at a scrap dealer. They are
fine units; they require +5, +12 and -7 to -12 Vdc to operate. The 1pps is 1
pulse-per-second. The other reference output is 10 MHz sine wave at from +10
to +13 dBm output. After disciplining, the outputs are within 10E-10 to
10E-12 of the GPS constellation master clock which is Cesium-based. In other
words, they are infinitely better than anything required on HF for a
reference, but if you are working at VHF up to microwaves, the frequency
accuracy gets to be something worth considering. The one in the picture kind
of looks like it was painted. The units were originally gold-alodined
aluminum cases, and they came with a 3 dB splitter mounted to the top cover
for splitting the 10 MHz output 2 ways.

If you have any questions about the units, I'll try to answer them.

73,

geo - n4ua

On Wed, Aug 3, 2011 at 6:05 PM, Fred Townsend <ftownsend at sbcglobal.net>wrote:

> Brian: For us guys out there that may not be familiar with a GPS DO how
> about a little information. I visited the e-bay site and found the titled
> PRECISION GPS 10Mhz 1PPS picture. Now I can handle 10 MHz but what is 1PPS?
> One pulse per second? One part per picosecond? Is that long term or short
> term? Is that a 24 volt power supply? Does the power supply come with it? I
> also see it's refurbished. What part was refurbished and why?
>
> I would enquire offline but I bet there are a lot of others that would like
> to know too.
>
> Thanks,
> de Fred, AE6QL
>
> -----Original Message-----
> From: elecraft-bounces at mailman.qth.net
> [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Brian Alsop
> Sent: Wednesday, August 03, 2011 10:11 AM
> To: elecraft at mailman.qth.net
> Subject: [Elecraft] FS GPS DO
>
> Guys,
>
> Used this to calibrate my Rubidium standard.  Have no further use for it.
>
> Working unit is complete with power supply, GPS, active antenna
> interconnect
> cables and Windows software.
>
> See:
> http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=290322053618
> for pix of it.
>
> Contact off reflector.  Reasonable offers accepted.
>
> 73 de Brian/K3KO
>
>
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