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

Bob Camp kb8tq at n1k.org
Fri Oct 31 20:02:08 EDT 2014


Hi

A  $0.15 each dual / quad / hex / octal buffer IC’s will get you > 15 dbm per pair of gates. For under $10 in active parts you can have 30 or 40 outputs. I suspect that if you look inside the 3812 that’s exactly how they are generating the 10 MHz you are looking at. 

Bob

> On Oct 31, 2014, at 7:01 PM, Graham / KE9H <ke9h.graham at gmail.com> wrote:
> 
> Bill:
> 
> 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>
> wrote:
> 
>> 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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