[time-nuts] NTGS50AA, better than Thunderbolt

bg at lysator.liu.se bg at lysator.liu.se
Sun May 20 21:31:11 UTC 2012


Hi Mark,

> My second NTGS50AA came in from Old Cathay.  Seems to be working OK.  A
> couple weeks of oscillator aging will tell more.   This one originated
> from Guatemala City, Guatemala (the other one also came from Guatemala)
> The seller on Ebay has scaled back his dirty capitalist pig escalation in
> price down to $100...  shipping still at the 100% markup of $60 (unit was
> was $69/$30 before the excitement).
> Note that these units do have the pads for SMA connectors if you want to
> replace the oscillator.

I got two Trimble boards from HK. They seem to be an earlier version of
the NTGS50AA. There is one BIG full length PCB, no separate daughter board
with LEDs and DB9 serial port. See Ebay #300678217853.

They run fairley well, have not let them settle down really. There are
some very slight differences between the boards. PWB markings 45000-00-C
rev H and 45000-00-B rev C. The newer has FW 3.62 and OCXO are Trimble
49422-CR, date 0436. The older board has FW 3.55 and OCXO marked Trimble
STP 2254, SPEC 34310 C1, date 0247.

Running Tboltmon you get a GUI page for controlling the LEDs. Never saw
that for the ordinary Tbolts. So it seems the Tboltmon is aware of these
variations. :-) It is a 8 channel GPS.

Has anyone compared these full length GPSTM Thunderbolts with the smaller
layout NTGS50AA versions?

--

    Björn





More information about the time-nuts mailing list