Jason Rabel said the following on 12/31/2006 09:45 PM:
> The two units go in (what was told to me) an open frame chassis, it has SMA
> and I believe DB-15 connections along the top. The connections on the
> chassis split the signals even more, presumably for routing to the rest of
> the cell.
>
>
Rex said the following on 12/31/2006 08:08 PM:
in the boxes, so far.
>
> I just got an RFG-RB which seems to be a few years newer than the
> RFTG-m-RB's. In that one, I can't find any connection to the LPRO Rb
> module, in it, that could cause it to be disciplined. The one I have
> seems to be sti
David,
Your thinking pretty much along the same lines as me from your post.
FYI, I didn't mean the XO itself, I meant the "XO module" (specifically the
GPS/PPS signal).
There is also a "RFTG-u REF 0" on eBay, however the picture is so poor I
can't make out all the connections. But it too has the
The RFG-XO doesn't have a GPS unit in it. It has a 10 MHz in, and of course
the 15 MHz out. It also only has three DB9 connection, the 24V, interface,
and alarm It is missing the RS-485/1PPS connection.
Similar the RFG-RB doesn't have the RS-485/1PPS connection.
> I just got an RFG-RB which s
The two units go in (what was told to me) an open frame chassis, it has SMA
and I believe DB-15 connections along the top. The connections on the
chassis split the signals even more, presumably for routing to the rest of
the cell.
http://campus.pari.edu/k4cso/gps/Lucent/
I was able to contact the
ll Hawkins
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On
Behalf Of Rex
Sent: Sunday, December 31, 2006 7:08 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] New pics of RFTG-m-Rb, and some comparison
details
On Sun, 31 Dec 200
On Sun, 31 Dec 2006 09:22:50 -0600, "Jason Rabel"
<[EMAIL PROTECTED]> wrote:
>Pretty sure that the RB is disciplined from the XO through the interface
>cable. I posted the pinout a couple times before so people can make their
>own.
I don't so. I think the RB units have just their factory calibrat
On Sun, Dec 31, 2006 at 09:22:50AM -0600, Jason Rabel wrote:
> Pretty sure that the RB is disciplined from the XO through the interface
> cable. I posted the pinout a couple times before so people can make their
> own.
While I may have too much shoe leather in mouth to think
clearly, it se
Pretty sure that the RB is disciplined from the XO through the interface
cable. I posted the pinout a couple times before so people can make their
own.
As for the 10 MHz on the Rb Why not just get a mini-circuits splitter
(cheap on eBay) so you have the 10 MHz from the RB and can still run it
ussion of precise time and frequency measurement"
>
> Sent: Sunday, December 31, 2006 9:01 AM
> Subject: Re: [time-nuts] New pics of RFTG-m-Rb, and some comparison details
>
>
>
>> Bill Hawkins said the following on 12/31/2006 02:15 AM:
>>
>>
>>> A
ssion of precise time and frequency measurement"
Sent: Sunday, December 31, 2006 9:01 AM
Subject: Re: [time-nuts] New pics of RFTG-m-Rb, and some comparison details
> Bill Hawkins said the following on 12/31/2006 02:15 AM:
>
>> Anybody know how to divide by 2/3rds without a micropr
Bill Hawkins said the following on 12/31/2006 02:15 AM:
> Anybody know how to divide by 2/3rds without a microprocessor? :-)
I suspect it would be pretty easy to tap off the 10MHz signal from the
XO in addition to (or instead of) the 15MHz output.
John
__
Hal Murray wrote:
>> If you mean multiply the 15MHz output by 2/3 to generate 10MHz, simply
>> use asynchronous divide by 3 counter (2 fliplops) to produce a 5MHz 1/
>> 3 duty cycle (or 2/3) output then filter out the 10MHz 2nd harmonic
>> component with a bandpass filter. The 3rd Harmonic (15MHz
On Sat, Dec 30, 2006 at 02:24:32PM -0500, John Ackermann N8UR wrote:
> On the mezzanine board, U302, a Burr Brown ADS7807U (presumably an ADC,
> though I haven't looked it up yet) is present on the XO version, but
> missing on the Rb version. And, programmable device U103 has a
> different number.
> If you mean multiply the 15MHz output by 2/3 to generate 10MHz, simply
> use asynchronous divide by 3 counter (2 fliplops) to produce a 5MHz 1/
> 3 duty cycle (or 2/3) output then filter out the 10MHz 2nd harmonic
> component with a bandpass filter. The 3rd Harmonic (15MHz) will
> conveniently
On Sun, Dec 31, 2006 at 01:15:12AM -0600, Bill Hawkins wrote:
> 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 5
measurement'
> Subject: Re: [time-nuts] New pics of RFTG-m-Rb, and some comparison
> details
>
> 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
CTED] [mailto:[EMAIL PROTECTED] 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 w
f 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 yes
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
On Dec 30, 2006, at 2:24 PM, 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/
I did some reverse engineering on my RFTG-m-RB last
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/
In looking at the two units, both use the same main and "mezzanine"
board, but there are component differences.
On the
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