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Nixie Tube Clock ‘Spectrum 18’
Issue 2 (15 February 2015)
www.pvelectronics.co.uk
- 35 -
7.5 Function of the GPS / RFT indicator LED (D5):
•
No Radio Synchronisation source installed (parameter (12) = 0)
LED is permanently off
•
RFT or GPS Synchronisation enabled (parameter (12) = 1-4)
The LED will be ON if the clock has synchronised in the last two
hours; slowly flashing if the last synchronisation was between 2
hours and 24 hours ago; and off if the last synchronisation is older
than 24 hours.
•
If DCF or MSF mode is selected, the indicator will flash rapidly
whilst the clock is actually receiving and processing a valid time
frame.
•
Additionally, the indicator will flash very briefly each second whilst
seeking a RFT frame.
The function of the RFT indicator LED may be summarised in the
table below:
Radio Time
Source
Sync <
2 Hrs
Sync >2 Hrs
Sync < 24
Hrs
Sync > 24
Hrs
Seeking
RFT Frame
Aquiring
RFT
Frame
None
Off
Off
Off
-
-
DCF / MSF
On
Slow Flash
Off
Intermittent
Flash
Fast Flash
GPS
On
Slow Flash
Off
-
-
Содержание Spectrum 18
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