[time-nuts] TBolt in the house!

[John Miles]

Unless you are going to use a different OCXO, there is nothing to do except
perhaps tell it to save the self-survey results and set your "foilage mode"
if desired.  They are plug and play.

-5 V/Hz is the correct kvco parameter; any changes will either degrade the
phase margin and give you a "hump" in your loop response, or lengthen the
loop response.  And it wouldn't be advisable to alter the loop-time and
damping parameters without taking a series of ADEV plots under various GPS
reception conditions to make sure you're actually improving things.

The DAC voltage on mine is sitting at 0.608664V, with a corresponding DAC
value of 8F49D.  This is a 20-bit value centered at 0x80000.  As long as you
are between 0x10000 (a bit more than -5V) and 0xF0000 (a bit less than +5V)
your oscillator has sufficient control range.  If it goes closer to 0x00000
or 0xFFFFF it means you're about to hit the rails, and would need a new
OCXO.  This *might* happen if you left it running for 30 years.

-- john, KE5FX


> -----Original Message-----
> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com]On
> Behalf Of Richard Moore
> Sent: Thursday, November 20, 2008 3:28 PM
> To: time-nuts at febo.com
> Subject: [time-nuts] TBolt in the house!
>
>
> Hi, nuts -- I just got my TBolt from h-whole-bunch-of-b's-bob in
> China. He nicely gave me the time-nuts discount, and also included a
> power connector with pigtail leads. Including shipping, it was $175
> and it took 7 days to get here in W. Wash. You can find him and these
> units on eBay at:  http://stores.ebay.com/High-precision-Osc-from-China
>
> It's date code is 3/19/05.
> The App Ver is 3.00  6/27/2.
> GPS Core is 10.02  11/14/1.
> ID is 96.
> s/n is 82331036  3/7/5.
>
> It's up and running in a top-of-bench way, and I have a few Qs:
> 1)  What are good params to use for the loop to get best frequency
> acc'y and stability?
> 2)  Is there a firmware upgrade you recommend?
> 3)  What V/Hz figure do you all recommend? It's at what must be a
> default of -5...
> 4)  DAC voltage is +0.0633...  Is this a fairly normal value?
> 5)  I downloaded Tboltmon v. 2.60 and it works great with my 232>USB
> adapter, but DSPMon does not see the data at all -- no TX or RX. Does
> it not work with this vintage/version of TBolt?
>
> Best,
> Dick Moore
>
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