[time-nuts] Lucent KS-24361, HP/Symmetricom Z3809A, Z3810A, Z3811A, Z3812A GPSDO system

Graham / KE9H ke9h.graham at gmail.com
Fri Oct 31 19:01:57 EDT 2014


On cable TV systems, 50 MHz to 500 (or higher) are the forward channel.
(Head-end to client.)
Below 30 MHz is the reverse channel, for data going from the client to the
cable company.
The band 30 to 50 is a cross over zone for the band splitting filters.

It is designed to not amplify the forward direction below 50 MHz.

--- Graham


On Fri, Oct 31, 2014 at 4:07 PM, Bill Riches <bill.riches at verizon.net>

> Hi Bob,
> I connected 10 MHZ test jack output to a 15 db el-cheepo CATV amp and the
> output of that to a 4 way splitter.  Splitter outputs went to 3336-3586 and
> counter.  All seem to like the ref signal.  Output of the amp takes makes
> the semi-square wave into a sick saw tooth.  Amp is only rated from 50 to
> 500 mhz so strange things are happening with 10 MHZ input.  Other CATV amps
> do have better low fx response - will play with that later.
> I have 10 mhz pulse from Lucent into trigger input of 465 scope and
> Thunderbolt gps output into vertical input of scope.  Time base is set for
> .01 Usec per div. I notice that trace moves right to left then left to
> right about every 5 min or so.  Moves about 3 div before changing
> directions.  Why?  Is the Lucent still making a list?  It has only been on
> for a few hours.  It takes about 10 min for GPS to go out from a cold
> start. (My Thunderbolt and RB do not change direction when using one as
> trigger and the other for vert input to scope)
> I ordered a USB to RS422 converter cable - will be here next week.  What
> program is sort of working?  Using Windoze 7 64bit and have an old XP
> machine available.
> Sure do appreciate all the info from our time nuts gurus!
> 73,
> Bill, WA2DVU
> Cape May, NJ
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