Rubidium Standard

[texaspyro]

does anyone happen to have any information as to what can be done with the Serial Port on the XHTF1003H by Chengdu Tianao Electronics Co., Ltd., and how the protocol works?

My bet is the serial protocol is the same as the LPFRS.  Serial 1200,8,N,1  On the LPFRS the serial port is TTL level RS-232 (not inverted TTL "UART" polarity).  You can connect it directly to most serial ports. 

Pin 9 goes to RS-232 pin 2  and pin 5 goes to RS-232 pin 3.  Try sending it a "M" or "V"  There are also commands for setting the freq.  Coarse freq is done by a DDS and fine freq is done with the C-field current. 

Lady Heather v6 will be able to talk LPFRS.  Attached is a plot of an LPFRS powering up.


http://www.spectratime.com/documents/lpfrs_manual1.pdf

[Johnny10]

I just purchased an Efratom Rubidium Oscillator CTS-101

Is there pinout data available?

Would like to make a distribution box for this unit.

[edpalmer42]

I just purchased an Efratom Rubidium Oscillator CTS-101

Is there pinout data available?

Would like to make a distribution box for this unit.

A google search doesn't turn up much.  There's likely a more common Rb standard inside the box.  You may have to dump the box and just work with the Rb standard itself.  That J3 connector by itself will likely cost $30 - $50.  J2 is almost as bad, although it's the same connector that's on the FRK Rb standard so you might luck out and find that it's the same pinout.

When you get the unit, start a new thread instead of adding on to this one.

Ed

[awallin]

I just purchased an Efratom Rubidium Oscillator CTS-101

these might help, but no manual for that particular model number...
http://www.ko4bb.com/getsimple/index.php?id=manuals&dir=02_GPS_Timing/Efratom

[Johnny10]

I feel like such a dummy.

Took apart the CTS-101 case and inside...

FRS-C 10MHz which I had no problem finding the manual for.

[edpalmer42]

Is there anything else in there that looks interesting?  Those external connectors suggest that there should be other functions in the box.  By the way, the connector that plugs into the FRS is also quite expensive to buy so be sure to salvage it.

Ed

[Johnny10]

Just one board.

[Johnny10]

After a bit more research I see someone asked time-nuts back in 2005 Board 55761

[time-nuts] Unknown Efratom 10MHz Assy, information asked

answered:
The board you are describing is used in the Lucent RFG-M-XO reference
frequency generator. It takes in 10 MHz on J2 from a Rubidium oscillator and
disciplines the Efratom SC cut OCXO on the main board from the 10 MHz input.
The output from the OCXO is converted to 15 MHz and supplied as the
reference output on J4.
The RFG-M-RB and RFG-M-XO normally mount together in a chassis



Well Maybe

[edpalmer42]

You can research the Lucent RFG equipment.  There's a fair amount of info around on it.  But I don't remember seeing a board that has that large connector on it.  It doesn't appear to have any smarts so it's just buffering, splitting, multiplying, maybe dividing.  Looks like at least one output is 20 MHz differential on the large connector.  I suspect that it will be a write-off.

Ed

[Johnny10]

I've been looking at manuals for some of the Efratom Portable Frequency Standards manuals.
I am beginning to think this board supplied the RS-232 input to FRS-C, and that J3 connector provided 1,5,10MHz TTL output, 5MHz Sine output and board connector provided 10MHz Sine.

Most units had a 24V Lambda Power Supply.
Just need to Find pinout for J2 to test that idea.
I already know from the Label the pinout for J1.

Front panels for the Portable Frequency Standards also had power on and frequency lock LED's.
And sometimes frequency adjust pots.

[Johnny10]

Got the board partially working with the Rubidium Oscillator.
Puts out 3 nice 10MHz sine waves from the J-3 connector and a pretty ugly 60Hz.