Real Time Clocks
The dissemination of time is one of the PTB's legal tasks. Most clocks in
the public sphere and in industry – but also the private radio clocks – receive
legal time via the long-wave transmitter DCF77 of the Deutsche Telekom AG.
At a radius of 2000 km around the location of the transmitter at Mainflingen
near Frankfurt, coded signals can be detected for 24 hours per day. Every
minute the numbers of minute, hour, calendar day, day of the week, calendar
month and the two last figures of the calendar years are BCD-coded and transmitted
by pulse duration modulation of the second markers. The 59th second is suppressed,
thus indicating that the next marker is the minute marker.
Link: Physikalisch-Technische
Bundesanstalt: www.ptb.de
It is show at Belgrade Fair 14.-19. May 2001. Hall 14
Link: ELECTRA-M&V, Velika Plana,
Serbia: www.electra.rs
Digital City Clock PT-01
- 4-digit Electromagnetic 7-segment Displays (SIGNALEX type 2410L),
- Display size: 24"x16" (height 610mm),
- Vane Color: Saturn-Yellow, Black background standard,
- Visibility: To 75 degree either side,
- Viewing Distance: max. 300m,
- Change every 15 sec : Time (Hour:Minute), Date (Day:Month), Temperature,
- If voltage of lead battery < 11V at big display stand "____",
then voltage of lead battery > 12V at big display normal work,
- Detection short and break circuit in cable (Indication at the
big display " _C" and " -C"),
- Supply voltage: 12V, 7Ah lead battery,
- Time-work without power supply: > 6 hours,
- IU-Charger for lead battery: 220V ac / 13.8V dc, 1.5A,
- It consists of Perfect time controller PTC-77 and 5 pcs Buffer boards EMB-70.
- Dimensions: 3 x 1.2 x 0.5 m.
Digital City Clock PT-11
- 4-digit 7-segment LED Displays for Hour:Minute (height 320mm) and
- 2.5-digit 7-segment LED Displays for Temperature (height 200mm),
- Supply voltage: 220V ac / 12V dc, battery 7.2V Ni-Cad, 500mA for without power supply,
- IU-Charger for Ni-Cad battery: 12V dc / 8.8V dc, 70mA,
- It consists of Perfect time controller PTC-77 and Buffer board ALB-148.
- Dimensions: 1.5 x 1 x 0.1 m.
Digital City Clock PT-12
- 8-digit 7-segment LED Displays for Date (Day:Month), Time (Hour:Minute) (height 100mm),
- Supply voltage: 12V dc,
- It consists of Perfect time controller PTC-77 and 2pcs Buffer board ALB-132.
- Dimensions: 1.2 x 0.2 x 0.1 m.
