3.2.7 DCF77 RECEIVING CONTROL
DCF-antenna
on
DCF-antenna
off
This display serves for controlling and setting of the DCF77-antennna.
„ss“:
indicates the seconds (0-60, with overflow „??“), after the minute mark has been
identified
„nn“:
cycle counter (0-99) of the received second marks.
„D:D.Ds“:
time difference of the second marks in seconds (ideal: 1.0s, except for the second
60 (minute mark): 2.0s)
„L:NN B“:
length of the second marks in 10ms(NN).
B indicates the binary decoding (L= 6..13[10ms] -> „0“, L= 16...23[10ms] -> „1“,
other lengths are output with “?”)
After this output has been activated, the following values appear for example:
The minute mark has not yet been identified („??“). The 2. second mark received has a length of
190 (19*10)ms.
The length of the second mark (optimal: L=10 resp. L=20, the length is shorter with weak reception)
is well suited for the optimal alignment of the antenna.
After the minute mark has been recognized (D:2.0s und L: 7...13[10ms]) „ss“ is output and is raised
every second up to a maximum of 60. When the reception is correct, “ss” and “nn” run almost
synchronously. A difference of more than 1 means, that error pulses or not enough pulses have
been received; thus a decoding of the DCF77 time information is impossible.
Remark:
If the reception is very weak in the daytime, the antenna should be aligned at
night (broader reach). Never try to align the antenna during sunrise or sunset (site
of transmitter and receiver/datalogger) !
Possibly, there are several alignments (neither horizontal!) allowing a reception
(reflections).
The transmitter can be inactive for several hours (thunderstorm close to the
sender).
DCF77 Test: 32
32 D:1.0s L:08 0
DCF77 Test: ??
2 D:1.0s L:19 1
DCF77 Test: --
DCF77 Test: ss nn
D:1.0s L:10 0
34 - 56
021579/06/09
