[time-nuts] Nortel/Thunderbolt questions

[Jim Sanford]

I initiated a survey a few hours ago.

Now it thinks I'm at 175' altitude (more like 1280') and calls the saved 
position good.

What is the "normal stuff" to save the position??

Finally, every time that the satellite count changes, there's a huge 
(150,000 uV or so) excursion in the DAC voltage, so it never converges 
to small variation like I see when I look at the KE5FX site -- what is 
this telling me?

Thanks,
Jim

On 7/13/2013 8:44 PM, Bob Camp wrote:
> Hi
>
> On mine, I did a full reset and let them start from a survey. After they figured out where they were, I did the normal stuff to save the position.
>
> Bob
>
> On Jul 13, 2013, at 5:58 PM, Jim Sanford <wb4gcs at wb4gcs.org> wrote:
>
>> Bob:
>> Correct, the Trimble Nortel box.  Replaced the old HP antenna with the 26db amplified antenna which came with it, also mounted higher, and more clear of the roof.  It is seeing 5 satellites, 3 in yellow, and still says RECOVERY MODE.  It also (now) says, SAVED POSITION BAD, which I would expect, with a 300' error in elevation.
>>
>> Jim
>>
>> On 7/13/2013 9:04 AM, Bob Camp wrote:
>>> Hi
>>>
>>> I believe what you have here is a Trimble / Nortel box rather than a TBolt - is this correct?
>>>
>>> If so there are a number of differences in what you can and can't do with LH. Also since it's a different design, the filter is set up differently.
>>>
>>> That said, it should show lock, sats, dac voltage, and status correctly.
>>>
>>> Bob
>>>
>>> On Jul 12, 2013, at 3:56 PM, Jim Sanford <wb4gcs at wb4gcs.org> wrote:
>>>
>>>> All:
>>>> My Nortel receiver has been running for 6 days now.  I am running the Lady Heather software, but also have TBOLTMON.  It shows my position fairly well, but I have seen a negative altitude, and am currently seeing 1565' altitude.  Based on local maps and the GPS in the car, I believe the antenna to be no higher than 1280'.  I get lock with 4 to 6 satellites colored green.  I have seen PHASE LOCKED, but am currently seeing "recovery mode" and the LOCKED LED on the unit is flashing, which I think I remember means recovery.
>>>>
>>>> I have several questions:
>>>> 1.  Sometimes position is displayed in yellow, sometimes in white. What is the significance of the color?
>>>> 2.  I see TC 100.0 sec, DAMP1.200, GAIN 1.2 Hz/v, INIT 3.00V. When I go to KE5FX site, his values for TC, DAMP, Gain and INIT are very different.  In particular, if DAMP is damping in a control loop, I am not surprised that my very overdamped unit is not locking.   Question:  Are these parameters that will converge, or are they parameters I should try to set?  The heather.cpp files suggests that they may be settable, but does not say how.
>>>> 3.  On my plot, I see an RMS value in green, which suggests to me that something is happy with the DAC voltage, even if very different from John's.  The scale is 100000uV/div which suggests to me that it is NOT locked.
>>>> 4.  On my plot, I see an RMS value in yellow, which suggests to me that the temp is OK, but the scale on temp is growing.... at the momoent, 10mC/div; John's is 50 mC/div, but a much smoother plot than mine.  What is this telling me?
>>>>
>>>> ROM,RAM, OSC, FPGA, POWER, EEPROM, ANTENNA, ALMANAC, DISCIPLINE, SAVED POSITION status are all OK, even though altitude is bad.
>>>> Can anyone help me understand what I am seeing, and in particular, why it won't lock, or stay locked, when it is seeing good sat signals?
>>>>
>>>> Thanks!
>>>> Jim
>>>> wb4gcs at amsat.org
>>>>
>>>>
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