Hi there,
this could also be caused by a slight error in the Auto Survey position of
the Fury GPSDO.
The M12 does the auto survey over 3 hours, so you are limited to the
accuracy and constellation of the Sats during that time period. You could try
the
following to improve your position accuracy:
1) Write down your present hold position.
2) Do another auto survey, preferably at night if you did the first one
during the day, or during the day if you did it at night etc.
3) Average the two resulting positions, pay particular attention to Antenna
height. For example if you get a height of 45 meters and 47 meters from the
two measurements, use 46 meters as the averaged result.
4) Enter the averaged position into the unit manually by using the:
GPS:POS
and:
GPS:POS LAST
commands.
5) Repeat from 1) as necessary.
Additionally you could try:
6) Increase your Mask angle from 10 Degrees with the command
GPS:SAT:TRAC:EMAN 20
7) Make sure the M12 TRAIM is turned on with the command:
GPS:REF:TRAIM ON
Hope that helps,
bye,
Said
In a message dated 12/20/2008 12:40:28 Pacific Standard Time,
kc0...@msosborn.com writes:
I've been tracking my Fury GPSDO (ROM version 1.21) equipped with an
Isotemp OXCXO134-10 oscillator for a couple of weeks now and have
noticed that the Time Interval (TI) spikes around 20 to 40 nsec
everyday at 17:45 UTC (11:45 AM CST local time). There are minor
spikes (5 nsec) every 2 to 3 hours, but I find the large spikes to be
very curious.
The oscillator itself has no idea of the time of day (does it?), the
Fury generated EFC follows the spike and brings the TI back into line
within tow or three minutes. There are no unusual charges to the EFC
prior to or after the spike.
I've already tracked ambient temperature over several days and have
seen nothing unusual. I'm going to monitor line voltage next.
Has anyone else ever seen such behavior?
-- kc0ukk at msosborn dot com
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