Hi Paul,
the phase modulation would interfere with the AM, since during the phase
change the narrow band crystal filter's output will sink down as the
filter is following the phase change, and the time needed for the filter
to "swing in " to the new phase it depend on the angle of the phase
change angle, for 180 degree it is 2 x [1/f] x Q , [1/f] x Q needed to
"swing on" and the same time to swing down from the old phase.
[[Rohde&Schwarz's old Q meter is based on that, it counts the zero
crossings until the level of the signal sinks to ....]]
and that causes an additional AM modulation, if the quartz filter of the
clock is not so good, the [1/f] x Q time is shorter and the filter
after the demodulator does not let it pass the amplitude change, thus
the cheaper clock works better, until one switching mode power supply
takes over the control from the WWVB....
73
Alex
On 11/21/2014 7:17 AM, paul swed wrote:
Glenn
I want to say that my simple wwvb clocks are working. However my most
finicky one is not locked as I just noted. But then its always a problemed
child.
The format contains bpsk but that was not supposed to interfere with the
traditional AM modulation these clocks detect.
I might strongley believe that the various electronic lights that are
becoming pervasive is seriously deteriorating the ability to detect the
signal.
I am near Boston so thats fringe.
Regards
Paul
WB8TSL
On Fri, Nov 21, 2014 at 12:06 AM, Glenn Little <glennmaill...@bellsouth.net>
wrote:
Are there any "atomic" clocks that do not properly decode the current WWVB
format.
I have two that will not auto update the time and will troubleshoot if
this is not a format issue.
Thanks for any help.
73
Glenn
WB4UIV
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