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
wb4...@amsat.org
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