Nixie Tube Clock ‘Halo’
Issue 3 (01 Nov 2018)
www.pvelectronics.co.uk
- 32 -
8.5 Function of the GPS / RFT indicator LED (D4):
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.
Whilst seeking DCF or MSF the LED will flash very briefly once per second.
Additionally, the indicator will flash rapidly whilst the clock is actually
receiving and processing a valid time frame.
The function of the RFT indicator LED may be summarised in the table
below:
Radio
Time
Source
Seeking DCF
/ MSF Frame
Aquiring DCF /
MSF Frame
Sync <
2 Hrs
Sync >2 Hrs
Sync < 24
Hrs
Sync
> 24
Hrs
None
-
-
Off
Off
Off
DCF / MSF
Brief flash
each second
Fast Flash
On
Slow Flash
Off
GPS
-
-
On
Slow Flash
Off