[time-nuts] Help ID 5 MHz Distribution Box

[Ed Palmer]

   Pinout is as follows - I think - remember that this is a work in
   progress
   1 - no connection
   2 - alarm output - High = alarm, low = normal  (TTL)
   3 - probably 'reference fail' - High = fail, low = normal (TTL)
   4 - EFC okay - High if  4V8 < EFC < 7V5 else low (TTL)
   5 - no connection
   6 - buffered EFC voltage for oscillator
   7 - no connection
   8 - +10V reference output from oscillator - doesn't seem to be used for
   anything
   9 - +5V supply (input)
   10 - External EFC input - only used when reference fails
   11 - ground
   12 -    "
   13 -    "
   14 - +24V supply (input) for oscillator
   15 - +15V supply (input)
   You talked about BNC.  Did you mean TNC?  My unit has TNC and SMA
   connectors.  The SMA connectors are all outputs from the oscillator.
   J3 (TNC) is the input from an external 5 MHz reference.  J4 (TNC) is
   another output from the oscillator.  Approximate output levels are as
   follows:
   J2 - +7 dbm
   J4 - 0 dbm
   J5 - 0 dbm
   J6 - +7 dbm
   The purpose of the box is to discipline the internal oscillator to an
   external reference and then distribute the oscillator's signal to four
   outputs.  The level of the external reference can vary over an unknown
   range because there's an internal AGC circuit.  I haven't figured out
   the parameters of the low pass filter used on the output of the phase
   detector.  Just for laughs I took the 10 MHz output of a Navsync CW-12
   GPS board, divided it by 2, and fed it into the reference input.  The
   result wasn't pretty.  Obviously, the circuit wants a smoother source.
   On mine, the oscillator was defective.  I had to hack into it to fix a
   broken wire on the output transformer.  I started a message thread a
   few months back about how to hack into an oscillator - check the
   archive if you need to.
   Remember Engineering Rule #1 - Tune for minimum smoke!
   Ed
   Richard W. Solomon wrote:

Was it that good a deal ?? I'll share my secret, I use Gixen to snipe
on e-Pay. Sometimes it works, sometimes not.

Do you know the connections for the DB-15 connector ? Then I can do the
smoke test !!
Also what are the BNC and SMA connectors for ? Basically, I know nothing
but would appreciate any help. I will likewise share my findings.

73, Dick, W1KSZ

-----Original Message-----


From: Ed Palmer [1]<ed_palmer at sasktel.net>
Sent: May 14, 2009 1:10 PM
To: Discussion of precise time and frequency measurement [2]<time-nuts at febo.com>
Subject: Re: [time-nuts] Help ID 5 MHz Distribution Box

Since you beat me by *THREE SECONDS* I shouldn't help you, but I have
one of these boxes and have partially figured it out.  What do you want
to know?

Ed

Richard W. Solomon wrote:

I picked up a box from "over there" that says ..."5 MH REF DISTRIB"... ,
which I assume stands for 5 MHz Reference Distribution. It was made
by Satellite Transmission Systems of Hauppagge, NY. 2 BNC connectors
on one end, 3 SMA's a Red LED Alarm light and a DB-15 connector.

A real long shot, I know, but on the off-chance, does anyone know
anything about this ? Anyone know if the company still exists ?

Thanks, Dick, W1KSZ

_______________________________________________
time-nuts mailing list -- [3]time-nuts at febo.com
To unsubscribe, go to [4]https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.


_______________________________________________
time-nuts mailing list -- [5]time-nuts at febo.com
To unsubscribe, go to [6]https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

References

   1. mailto:ed_palmer at sasktel.net
   2. mailto:time-nuts at febo.com
   3. mailto:time-nuts at febo.com
   4. https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
   5. mailto:time-nuts at febo.com
   6. https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts