RFTG-m-XO disassembly photos
Dr Bruce Griffiths said the following on 12/27/2006 04:35 PM:
John Ackermann N8UR wrote:
The 15MHz out surprised me to. I haven't traced out the circuits but
from a couple of the components, I am guessing that they do something
like take the 3rd harmonic of the 10MHz OCXO and dividing that by 2.
John
That is not likely to be the scheme used, as there appears to be no
30MHz bandpass filter.
The alternative technique of dividing the 10MHz by 2 and then extracting
the 3rd harmonic of the resultant 5MHz square wave is more likely.
You're right, and it's a simpler method anyway. Let Occam rule.
John
Very nice pictures!
My RFTG-m-RB was waiting by the back door today when I got home. I just
took it apart, and surprise surprise inside is an Efratom LPRO-101 inside...
Not a Freq Elec whatever model, I guess maybe it must be a different
revision or something?
The boards inside look nearly the same as the XO model. Except where the
OCXO was, the LPRO sits. Also the GPS isn't there, but there are the solder
points, and a few other components are missing around where the antenna port
should be. I wonder if a GPS was added in if it would work. Once I get a 24V
supply I'm going to probe the GPS header to see if it has power.
On another note, I finally got a reply from those people that are selling
all those units on eBay. She said they have the chassis and cables and
everything too. She's supposed to take some pictures and get info for me,
I'll pass along whatever info comes in. If the price is right it might be
easier just to get a complete package than to try and southern engineer it.
;)
My camera is at the office, otherwise I would have taken pictures. I'll do
it first thing tomorrow if nobody else puts some up before then.
Jason
My RFTG-m-XO arrived today, and the first thing I had to do was rip it
apart. I've put a series of pictures of the thing in various stages of
disassembly at http://www.febo.com/time-freq/hardware/Lucent_GPSDO/.
The pictures are full resolution so you should be able to zoom in to
look at circuit details if you'd like.
When my -Rb arrives, I'll add pictures of it, as well.
I'm planning to repackage both units into a 19 inch rack chassis, so the
disassembly is toward a good end...
John
Well he hasn't any pictures (just ask for some).
Does anyone know what the output frequency is?
What shape the Rubidium would be in?
Thanks,
Jack
-----Original Message-----
From: time-nuts-bounces@febo.com [mailto:time-nuts-bounces@febo.com] On Behalf
Of Bill Hawkins
Sent: Tuesday, December 26, 2006 10:06 PM
To: 'Discussion of precise time and frequency measurement'
Subject: Re: [time-nuts] RFTG-m-XO disassembly photos
John,
Many thanks for posting the photos. Now I know that there are
no card edge connectors and no need to find a card rack. The
connectors are not all that difficult to trace. The arrow
pointing to +24 is a help.
What's all this about 15 MHz out?
Bill Hawkins
-----Original Message-----
From: time-nuts-bounces@febo.com [mailto:time-nuts-bounces@febo.com] On
Behalf Of John Ackermann N8UR
Sent: Tuesday, December 26, 2006 3:32 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] RFTG-m-XO disassembly photos
Nope, haven't fired it up yet. I'm not sure when that will actually
happen; too many projects going on in the basement! I wanted to get the
pics up to assist anyone else who may be working out the interface
information, so did that before anything else.
John
Didier Juges said the following on 12/26/2006 04:12 PM:
John,
Nice pics!
Did you at least run it to see if it works and what kind of
performance you could get out of it?
Didier KO4BB
John Ackermann N8UR wrote:
My RFTG-m-XO arrived today, and the first thing I had to do was rip
it apart. I've put a series of pictures of the thing in various
stages of disassembly at
The pictures are full resolution so you should be able to zoom in to
look at circuit details if you'd like.
When my -Rb arrives, I'll add pictures of it, as well.
I'm planning to repackage both units into a 19 inch rack chassis, so
the disassembly is toward a good end...
John
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