[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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