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
So, if we have two sources of 15 MHz in a CDMA minicell, each with
its own SMA connector, what module receives those two sources and
decides which one to use?
Why use XO and Rb when either could be made redundant for extended
reliability? (not the British sense of "made redundant")
Bill Hawkins
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
If the unit has an internal 10 MHz OCXO, it is hard to imagine the 15
MHz being cleaner than the 10 MHz, so it would seem the best way
(simpler and cleaner) is actually to tap off the OCXO with a suitable
buffer amp.
Didier KO4BB
jmfranke wrote:
> One approach would be to divide the 15 MHz by
One approach would be to divide the 15 MHz by three and then mix the
resultant 5 MHz with the original 15 MHz to get 10 MHz: original minus one
third equals two thirds.
John WA4WDL
- Original Message -
From: "John Ackermann N8UR" <[EMAIL PROTECTED]>
To: "Discussion of precise time and
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
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