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: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] > Behalf Of Richard Moore > Sent: Thursday, November 20, 2008 3:28 PM > To: time-nuts@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 > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.