[time-nuts] Help ID 5 MHz Distribution Box
Richard W. Solomon
w1ksz at earthlink.net
Fri May 15 02:01:39 UTC 2009
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 at sasktel.net>
>Sent: May 14, 2009 8:49 PM
>To: Discussion of precise time and frequency measurement <time-nuts at 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 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
>
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