That should give me a good start on this. Thanks very much for the info. Sometimes you find some interesting items "over there". I picked up two boxes that had 4 SMA's marked 10 MHz, 75 MHz, 750 MHz and 7,975 MHz. They also had a MIL style power connector with the mate attached. Turns out they were three oscillators that will lock to a 10 MHz input. When coupled with my 10 MHz GPSDO, they make great calibration signals for Service Monitors and Frequency Counters. I'll keep you posted on what I find. 73, Dick, W1KSZ -----Original Message----- >From: Ed Palmer <ed_palmer@sasktel.net> >Sent: May 14, 2009 8:49 PM >To: Discussion of precise time and frequency measurement <time-nuts@febo.com> >Subject: Re: [time-nuts] Help ID 5 MHz Distribution Box > > 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@sasktel.net> >Sent: May 14, 2009 1:10 PM >To: Discussion of precise time and frequency measurement [2]<time-nuts@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@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@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@sasktel.net > 2. mailto:time-nuts@febo.com > 3. mailto:time-nuts@febo.com > 4. https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > 5. mailto:time-nuts@febo.com > 6. https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >_______________________________________________ >time-nuts mailing list -- time-nuts@febo.com >To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >and follow the instructions there.