[time-nuts] Trimble Thunderbolt and David Partridge divider board question
Chris Wilson
chris at chriswilson.tv
Mon Oct 12 14:08:41 UTC 2015
12/10/2015 14:58
I have had my Trimble and Dave's divider board for many years and it's
on 24 hours a day, seven days a week, no problems.
https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&uact=8&ved=0CB4QFjAAahUKEwjr27ewjb3IAhVMVhQKHVmJALI&url=http%3A%2F%2Fwww.perdrix.co.uk%2FFrequencyDivider%2FFrequency%2520Divider%25202.1.pdf&usg=AFQjCNHiXeXt-NZksvMBKYHfkJPf5mn_Fw&sig2=YJooGHWI_easGkSZHUVPJgThe
Trimble uses a mushroom roof mounted aerial. I have recently built up
an amateur band 136Khz station giving about 800 Watts into a terribly
inefficient (electrically very very short) Marconi T aerial witha
horizontal wire loop capacitive top hat. I have used the 10MHz out of
Dave's divider board to lock a master oscillator in my Kenwood TS-590
transceiver, which is the driver for my 136kHz amp, giving just 0 dBm
out. I have found when the TX is on at 136kHz the Trimble / divider
baord output goes wild and a clean square wave goes seemingly random
on my scope with noise. This unlocks the TS-590, blah blah.
My questions are, is this likely to be RF affecting the Trimble, or
the board? the baord feeds a panel in my shck with its vearious
frequency divisions, the 10MHz output goes to the Kenwood TS-590
reference locking gizmo. The scope shows noise from a disconnected
RG-316 co-ax at the panel end. Should I get up in the loft and try
connecting the 10MHz direct from the Trimble and leave the board out
as a test? Does anyone know if a strong 136kHz signal is likely to
affect the Trimble itself?
Thanks.
--
Best Regards,
Chris Wilson.
mailto: chris at chriswilson.tv
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