Model 5601MSC
Model 5601MSC Master SPG/Master Clock System
OPERATION
Revision 2.2
Page - 53
If the GPS receiver is disconnected, the ovenized oscillator within the 5601MSC may drift very slowly
over time. The maximum frequency drift of the oscillator is less than 0.04Hz of subcarrier frequency
after a day of the GPS receiver being disconnected. The drift will be less than 0.3Hz if the GPS receiver
was disconnected or obscured from the sky for 1 year.
2.5.3. GPS Re-Lock in Slow Mode
When the frequency lock mode is set to Slow (see section 2.2.4), the 5601MSC can provide a very
smooth recovery of phase upon reconnection of the GPS antenna. There will be a very smooth
transition of the 5601MSC’s phase back to the GPS system time reference. This transition is very
gradual with no non-linear jumps. Because the phase period when locked to GPS is very long (160
seconds – see Figure 2-13) this relock process can take a long time when the phase is considerably far
off. The re-lock will take less then 40 minutes after an unspecified period of time (i.e. 1 year or more) of
the GPS receiver being disconnected or obscured from the sky. If the GPS receiver is removed for 5
minutes and then returned, the unit will take nominally less then 5 minutes to fully re-lock. If the GPS
receiver is removed for 15 minutes and then returned, the unit will take nominally less than 20 minutes
to fully phase-lock to the GPS system time.
2.5.4. GPS Position Insertion into Timecode
The 5601MSC can insert the current position of the GPS antenna into the user bits of the LTC and
VITC outputs. This is controlled by the
VitcLtc dte fmt
menu item in the
GENERAL
root menu (see
section 4.5.4). Timecode with even numbered frames contain longitude in the user bits, and timecode
with odd numbered frames contain latitude.
The format for latitude is wxxxyyzz where w is 1 for south (-), and 2 for north (+), xxx is degrees, yy is
minutes, and zz is seconds.
The format for longitude is wxxxyyzz where w is 3 for west (-), and 4 for east (+), xxx is degrees, yy is
minutes, and zz is seconds.
For example, at the Evertz Microsystems factory, the data is
latitude: 20432348
longitude: 30794623
This corresponds to:
North (+) 043 degrees, 23.48 minutes
West (-) 079 degrees, 46.23 minutes
It can be entered into Google maps using the format “+43 23.48 -79 46.23”.
Содержание 5601MSC
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