Just found this.
"It's a CMOS oscillator, and can handle about 10 volts
before it turns off and stops oscillating. The overvoltage
doesn't seem to do any damage, so there may be an overvoltage
protection in the circuit, by design or by accident. After
putting 12 volts in and getting no oscillation and no heating,
I went back to 9 and it worked fine again.

The spec sheet will tell you the limit is 5 volts. "
David

What is the 3rd connection on the Xtal?
Is this the 1st April?
David.

Thanks Paul.  That was a great help I will go and do a lot of reading.
Looks like I need 8F AC Bytes 20-23 (GPS offset (ppb)).

David.

Paul.  Thanks for that.  Looks like I need to do a lot of reading.

I think I will try some other thinks before I do anymore to this.

Just one(2) things am I right I think each packet start with "10 F8"?
If so is this how it should be split.?

Packet 1
10 8F AB 0 4 69 36 6 95
0 F 0 3A 11 8 19 4 7
DC 10 3 FF FF FF FF FF
Packet 2
10 8F AC 7 0 64 0 0 0
75 0 0 0 C0 0 0 0 0
3F 78 7 11 3C 2E BB 77 0
9 44 1 3F 4A 80 A0 41 D7
C8 43 3F ED 8D 22 5F 5D 7D
5C 3F 93 84 20 67 D5 D CC
40 59 D1 38 4B C 0 0 0
0 0 0 0 FF FF FF FF
Packet 3
10 8F AB 0 4 69 37 6 95
0 F 0 3B 11 8 19 4 7
DC 10 3 FF FF FF FF FF
Packet 4
10 8F AC 7 0 64 0 0 0
75 0 0 0 C0 0 0 0 0
3F 43 C3 50 3C 88 F6 6F 0
9 44 1 3F 4A 80 A0 41 D7
CA 4 3F ED 8D 22 5F 5D 7D
5C 3F 93 84 20 67 D5 D CC
40 59 D1 38 4B C 0 0 0 
 0 0 0 0 0 FF FF FF FF
 Packet 5
10 8F AB 0 4 69 38 6 95
0 F 0 0 12 8 19 4 7
DC 10 3 FF FF FF FF FF
Packet 6
10 8F AC 7 0 64 0 0 0
75 0 0 0 C0 0 0 0 0

Thanks agn David.

Hi.  Has anyone decoded the out put from a Thunderbolt GPS disciplined clock.
http://trl.trimble.com/dscgi/ds.py/Get/File-10001/ThunderBoltBook2003.pdf
I can capture the HEX code at 9600-8-N-1.
Here is 1 and a bit blocks.

10 8F AB 0 4 69 36 6 95
0 F 0 3A 11 8 19 4 7
DC 10 3 FF FF FF FF FF
10 8F AC 7 0 64 0 0 0
75 0 0 0 C0 0 0 0 0
3F 78 7 11 3C 2E BB 77 0
9 44 1 3F 4A 80 A0 41 D7
C8 43 3F ED 8D 22 5F 5D 7D
5C 3F 93 84 20 67 D5 D CC
40 59 D1 38 4B C 0 0 0
0 0 0 0 FF FF FF FF
10 8F AB 0 4 69 37 6 95
0 F 0 3B 11 8 19 4 7
DC 10 3 FF FF FF FF FF
10 8F AC 7 0 64 0 0 0
75 0 0 0 C0 0 0 0 0
3F 43 C3 50 3C 88 F6 6F 0
9 44 1 3F 4A 80 A0 41 D7
CA 4 3F ED 8D 22 5F 5D 7D
5C 3F 93 84 20 67 D5 D CC
40 59 D1 38 4B C 0 0 0  
 0 0 0 0 0 FF FF FF FF
 
10 8F AB 0 4 69 38 6 95
0 F 0 0 12 8 19 4 7
DC 10 3 FF FF FF FF FF
10 8F AC 7 0 64 0 0 0
75 0 0 0 C0 0 0 0 0

That is as far as I got.
I would like to display the Timing Outputs (errors) and the date-time on to a LCD display to save running a PC and the Monitor program.

Thanks for any help David.