I changed the root/eng/timing/offset parameter from -100 to 0 on my unit
and let it sit overnight. This morning, it is locked and without a
frequency offset. So I wonder why my unit would have had a 100 ns
offset programmed into it? I cannot figure out how to get the 0 value
to stick though. When I power cycle it, it returns back to -100.
I programmed various values into to the info field, restarted the unit,
and read the following results for the offset parameter:
0x00000000 -5
0x00000010 -5
0x00000021 -5
0x00000022 -5
0x00000024 -100
0x00000028 -5
This is interesting for a couple of reasons. First, it matches what
Jason is seeing in his units with the -5 ns value for offset. However,
a different TS2100-IRIG unit I looked had an info value of 0 and its
offset was also 0. Maybe the presence of the GPS unit makes it think it
needs an extra offset? We know that bit 6 is used for GPS vs. UTC for
the NTP time (from the manual). I suspect bits 2 and 5 are for GPS
since my unit was delivered that way. I would think at least 2 bits
would be for the osc type but which ones? And if Jason's unit came
delivered as an OCXO, why aren't any bits set to signify that? Maybe
the TCXO/OCXO is one configuration and the Rubidium is another. It
someone had a factory configured Rubidium unit, it would be interesting
to know if there are any bits that correspond to it.
-Bob
On 03/30/2011 08:40 PM, Robert Watzlavick wrote:
My unit (TCXO/GPS originally) has the root/eng/timing/offset set to
-100. A TCXO-IRIG unit that I looked at has an offset value of 0.
When I was first bringing up my unit with the OCXO, I was comparing
the 10 MHz output against a stabilized Thunderbolt and I noticed the
TS2100 EFC voltage seemed to stabilize but there was an offset in the
10 MHz output. The lock LED wasn't turning on either. I got
impatient and started poking around and that's when I noticed the
"offset" parameter was set to -100. I changed it to 0 and the lock
LED immediately turned on but then the EFC started heading the other
direction. I put it back at -100, let it sit for a few hours, and it
eventually locked without a frequency offset. I'll set my offset back
to 0 and see where it ends up overnight.
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