Assuming your OCXO unit came from the vendor pre-configured that way,
that means there are no changes required to the info field to convert it
from a TCXO to OCXO, just the gain and filter setting. This also seems
to match what Greg Dowd mentioned yesterday.
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.
I believe the bc635PCI has a very similar timing engine and its manual
has an entry for Command 0x29, Set/Request Advance/Retard Clock Value
which may be a similar function. The description says "This command
sets the value of the advance/retard clock that is used to slew the
timing the 1PPS epoch. This command will allow the user to speed up, or
slow down, the on-board oscillator while the TFP is in a flywheel state
or Freewheel Mode. The TFP adjusts up to 100 msec per second. Each
count is 10 us." If it was the same timing engine, then you would think
the units would be the same though.
-Bob
On 03/30/2011 04:19 PM, Jason Rabel wrote:
To all:
I ran the "root eng ee info" on my two TS2100s, both were originally IRIG units
but I upgraded them myself to GPS models...
Both my OCXO unit and TCXO unit reported "00000000"
As for the parameters in my "timing / utils" directory, here's both models:
OCXO (MTI 240-0530-D)
---------------------
gain = -20
filter = 0.9995000
low = 0.0000000 (Manual says this isn't used, but figured I would post it)
d/a = 0xa05d
tfp 0 = 0xa005
tfp 6& 7 = 0.9994965
TCXO
-------------------
gain = 2
filter = 0.9500000
low = 0.0000000
d/a = 0x85c0
tfp 0 = 0x85a4
tfp 6& 7 = 0.9499970
My OCXO model came from Yahoo!, it still has the asset sticker on the side. It
was in free-run mode when I got it. As mentioned
above, the OCXO is a MTI with the following info:
Model: 240-0530-D
PN: 010285-0530
If you want to see some hi-res images:
http://www.rabel.org/archives/Images/TS2100/
Time to poke around the eng directory and see if I can fix that pesky offset
compared to my other time servers... There used to be a
command in the earlier firmware versions but it appears they removed it.
remote refid st t when poll reach delay offset jitter
================================================================
+NET4501-1 .GPS. 1 u 37 64 17 0.714 -0.029 0.087
*NET4501-2 .GPS. 1 u - 64 77 0.820 -0.022 0.129
+PRAECIS .GPS. 1 u 61 64 37 0.712 0.052 0.058
-TS2100-1 .GPS. 1 u 63 64 37 4.937 -0.406 0.025
-TS2100-2 .GPS. 1 u - 64 77 4.976 -0.366 0.046
The "root / eng / timing / offset" shows:
Current offset : -5 at offset unit (100ns)
I wonder if that might do the trick? Hmmm...
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