[time-nuts] Endace TDS 24 unit anyone?

[Alexander Sack]

On Wed, Nov 3, 2010 at 3:08 PM, jimlux <jimlux at earthlink.net> wrote:
> Alexander Sack wrote:
>>
>> Hello Time-Nuts:
>>
>> Has anyone used a Endace TDS 24 unit before?  I have someone who has
>> one but we have no user manual.  Any pointers?
>>
>> And what is IRIG-B output suppose to look like...this unit seems to
>> give off two distinct outputs....one is a 3.3V to 1.5V sweep, the
>> other is just a 3.3V pulse (I assume that 1PPS).
>>
>
> Irig B will either be an amplitude modulated audio signal or the pulses.
> Mark (high amplitude, logic 1) to Space (low amplitude) should be 10:3 with
> 3:1-6:1 being the range .  The carrier is some multiple of the pulse rate
> (I've seen 1kHz pretty commonly)
>
> It could also be Manchester coded, but I've not seen that.. otoh, most of my
> IRIG experience has been with unmodulated versions.
>
> IRIG B runs at 100 bits/second, with 1 second frames (i.e. 100 pulses/frame)
> and the pulses are either 2 (zero),5 (one),or 8 ms (frame sync) long
>
>
> All is revealed in IRIG Standard 200  ..google and ye shall find.

Thanks guys!

-aps