[time-nuts] New pics of RFTG-m-Rb, and some comparison details

[Bill Hawkins]

Ah, well. I have also received two Lucent KS-24019 L106B, aka
RFTG-m-XO boxes. The serial numbers indicate 95 and 96 construction.
The assembly numbers, 55761ASSY103902-001 (55761 is the CAGE number
for Efratom) have Rev E, S/N 522 and Rev H, S/N 2385.

The Efratom crystal(?) oscillators are 023005-001, dated 95 and 96.
Google has no hits for that part number.

The GPS receiver has part number 2643686MAB. This gets a few hits
from vendors that will issue a quote for anything, but will not
describe the part or its manufacturer.

I made a power cable after tracing the male DB-9. Both drew 600 MA
from a 12.5 volt battery, started out with No GPS and Fault lights,
then the No GPS light started blinking. There was no GPS antenna on
the TNC connector, so I didn't leave them on. The antenna jack
supplies +5 volts.

No signal appeared at the 15 MHz SMA connector, so I hope it is
disabled until the oscillator is locked. Both of their 10 MHz IN
SMA connectors still had plastic caps.

I bought these units, and two of their RB cousins, hoping to get
rid of the HP Z3801 units and the CS standard. They add $30 monthly
to the electric bill. Now it seems that I was seriously misled, but
that's the way it goes on the net. I may yet figure out how to
discipline the RB from the XO.

Anybody know how to divide by 2/3rds without a microprocessor? :-)

Happy New Year (no qualifications)
Bill Hawkins


-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of David I. Emery
Sent: Saturday, December 30, 2006 11:10 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] New pics of RFTG-m-Rb, and some comparison
details

On Sat, Dec 30, 2006 at 02:24:32PM -0500, John Ackermann N8UR wrote:
> My RFTG-m-Rb arrived yesterday, so of course it's in pieces on the 
> bench today.  Photos (along with those of the -XO) are at 
> http://www.febo.com/time-freq/hardware/Lucent_GPSDO/

	My RFTG-m-XO arrived.

	Seems like they use a version of the UT+ timing receiver
R5122U1155, which is an 8 channel version of the Motorola Oncore design
optimized for timing.    This 2002 or so version seems to have been 
retrofitted to a 1996/97 base design.

	Apparently have an external antenna power supply on the
mezzanine board - presumably to allow the 80C188 to read antenna current
(or maybe it supplies 12 volts instead of 5).

	
-- 
   Dave Emery N1PRE,  die at dieconsulting.com  DIE Consulting, Weston,
Mass 02493 "An empty zombie mind with a forlorn barely readable
weatherbeaten 'For Rent' sign still vainly flapping outside on the weed
encrusted pole - in celebration of what could have been, but wasn't and
is not to be now either."


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