[time-nuts] Thunderbolt reception problems

[WarrenS]

Said

I know this is not something that you really want to have to fiddle with, 
but you may find some of it useful information.
More Default changes you may want to consider are:

With the default Dac Voltage setting of 0 and 
the Default Survey setting of DO NOT save position
If the power fails, then things have to start all over which can take a ling time.

Solution:
sorry I do not remember the exact names that tbolt monitor uses, but I think you can get the idea of what is needed from:

1) save the default startup Dac voltage using the current Dac voltage reading.

2) Save the current location (may have to manually copy it, don't remember)  
OR do a re-survey with the 'save survey location to eeprom' flag set.
   
That and the other default changes you have made Now ALMOST make it a plug and play. 
Unfortunately still without an sink indicating Led,
But With these setting I have never seen mine loose sink or go into holdover unless the power went off or I disconnected the antenna. 

And then if you really want to make it better,  when comparing Phase to your PRS-10,
There are other default setting that you can change that will improve it from two to ten times.
Without going into the details, the most important are:
1) Let it age a month,
2) ReSet the Dac gain, default is -5Hz/volt  mine measured around -3/volt
3) Set the damping, default is 1.2,    0.707 works better , Then set TC to 750 sec
4) Don't let the Temperature change fast (or at all), I'm using an active temperature controller, But a big passive 'brick thing' will help. 
5) insure the + 12 power supply is real good and does not change or have noise on it. 

have fun
ws
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Hi Warren,
 
that is correct, I care to make best use of the environment I have, not the 
 one I would like to have (sounds like Rumsfeld, doesn't it?!).

It works now with the AMU changes, and I did change the TC to 500 as  well. 
I am comparing against my PRS-10 Rubidium (driven by an M12+ receiver) and  
phase-measured on my 5370B.
 
Will post a drift plot sometime later today.
 
bye,
Said
 
***************
In a message dated 11/22/2009 23:10:53 Pacific Standard Time,  
warrensjmail-one at yahoo.com writes:

Said's situation: 
2) How to make the Tbolt work the best that  it can with a less than optimized existing setup.
Answer: Lower the AMU to  1, rise the elevation to 15or20, increase the TC setting to 500 sec.
(It  will work better than when the factory defaults are use with the #1 case  above)