[time-nuts] Upgrading TS2100 from TCXO to OCXO
Jason Rabel
jason at extremeoverclocking.com
Wed Mar 30 21:19:42 UTC 2011
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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