Nixie Tube Clock ‘Dink’
Issue 9 (10 November 2017)
www.pvelectronics.co.uk
- 29 -
8.5 Function of the GPS / RFT indicator LED (D9):
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
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