[time-nuts] Unknown Efratom 10MHz Assy, information asked
Charles S. Osborne
cosborne at pari.edu
Wed Nov 2 18:24:15 EST 2005
Richard, and Arnold,
Very timely comments. I may be in the middle of working on one of those
Lucent units. Or maybe mine is a slightly different version. The front panel
on my unit says RFTGm-II-Rb (for the Efratom LPRO Rubidium locked side) and
RFTGm-II-XO on the GPS locked OCXO side. I placed the unit's pictures at:
Mine has a string of failures in the 24vdc lines feeding both the Rb and
OCXO sides. Tracked down a blown 3A fuse just prior to two tantalums causing
high current. Removing them powered up a 28vdc to 5vdc DCDC converter but
didn't bring everything back alive.
On the OCXO board the same 3A 24vdc line fuse was blown and diode prior
to it. The OCXO so far isn't getting any DC on its pins. Haven't tracked
down the source of its power yet, but suspect its related to the other
problems. Probably all related to lightning damage that also took out the
GPS receiver in my Z3801A. The Lucent unit did work, but not fully, at one
time as the pictures show. But after it warmed up the Rb side would fail
back over to the OCXO side.
Does anyone have a pinout for the RS422/1PPS or Interface dB15
connectors on this type unit? And is there any software out there which will
look into the lock status/control similar to GPSCon does with the
Charles S. Osborne, K4CSO
Pisgah Astronomical Research Institute
1 PARI Drive, HC 73, Box 638
Rosman, NC 28772-9614
cosborne at pari.edu
----- Original Message -----
From: "Richard H McCorkle" <mccorkle at ptialaska.net>
To: "Discussion of precise time and frequency measurement"
<time-nuts at febo.com>
Sent: Monday, October 31, 2005 4:56 PM
Subject: Re: [time-nuts] Unknown Efratom 10MHz Assy, information asked
> 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
> disciplines the Efratom SC cut OCXO on the main board from the 10 MHz
> 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 (which I
> 't get) and the modules are connected to the chassis by a harness with a
> DB15 on the chassis end. The pin out for the harness is as follows:
> DB15M TO/Pin# Description
> Pin #
> 1 RFG0 - P1-1 +24v 1.3A/0.6A
> 2 RFG0 - P1-2 Common
> 3 RFG1 - P1-1 +24v 0.6A/0.4A
> 4 RFG1 - P1-2 Common
> 10 RFG0 - J3-1 Alarm
> 11 RFG0 - J3-2 Alarm
> 12 RFG1 - J3-1 Alarm
> 13 RFG1 - J3-2 Alarm
> A second interface cable ties the RB to the XO as follows:
> RBJ5 XOJ5
> Pin # Pin#
> 1 5
> 3 3
> The male DB9 is P1 and pin 1 = +24v @ 400ma, Pin 2 = Common. This will
> up the board so you can verify operation of the OCXO. Unfortunately that
> all the information I have on the unit.
> Hope this helps.
> ----- Original Message -----
> From: "Arnold Tibus" <Arnold.Tibus at gmx.de>
> To: "Discussion of precise time and frequency measurement"
> <time-nuts at febo.com>
> Sent: Monday, October 31, 2005 10:02 AM
> Subject: [time-nuts] Unknown Efratom 10MHz Assy, information asked
> > Hello to the group,
> > I have got in my hands a very nice looking board
> > from EFRATOM equipped with a 10 MHz OCXO.
> > The designation on the top of the board is
> > 55761ASSY104920-001
> > the label underneath shows
> > 55761-104919-001
> > The Ocxo P/N is 105243-001, 10,00MHz
> > The board is complete with 3 x 9pin D-Type connectors
> > 2x fem. 1x male, which seem to be the connector
> > for the powering of the assy.
> > There are 2x SMA conns. fem., J2 and J3, J1 is not
> > assembled.
> > For memory backup there is a mignon battery holder on.
> > The small board monted on top of the main board
> > does have a PLL system with a 74HC4046N and a lot
> > of other typical chips assembled (CD4060, 74HC08,
> > 54HC573F, AD75388Q and others.).
> > I guess this was a part of a Rb-reference device,
> > too nice to disassemble.
> > Therefore I ask into the round table all the experts, if there
> > is somebody who could help me with more details, circuit diagram
> > or I/F informations etc.
> > As I am anyway trying to set up a GPS disciplining system
> > for a 10 MHz OCXO or a Rb LPRO oscillator.
> > BTW. I am enjoying since a few weeks following all the expert
> > discussions on this site and I red most of the technical issues
> > a few years backwords, I learned a lot, thank you all the
> > excellent discussions and informations of the experts.
> > I would be happy to get informative answers and help,
> > thanks in advance,
> > excuse me my struggling english please, I am willing to learn as
> > well on that point.
> > Arnold, DK2WT
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