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-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Peter Bell
Sent: Wednesday, December 21, 2011 5:28 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Efratom FRK - no 10Mhz oscillator
Yeah
:24
To: 'Discussion of precise time and frequency measurement'time-nuts@febo.com
Reply-To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Subject: Re: [time-nuts] Efratom FRK - no 10Mhz oscillator
Thanks, all, for your recent help on my Efratom. I finally got
Date: Wed, 4 Jan 2012 11:35:24
To: 'Discussion of precise time and frequency measurement'
time-nuts@febo.com
Reply-To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Subject: Re: [time-nuts] Efratom FRK - no 10Mhz oscillator
Thanks, all, for your recent help
Btw ...Is there any place in Austin, TX I could walk in with the Efratom and
get a 'cesium' check on the Efratom and calibrate it even further??? Appears
it has a trimmer for such.
If you move your gear to someplace strange, you have to consider warm up time
and changes in temperature and
Yeah, that was why I suggested just sticking a random 10MHz xtal
across the pins on the board (with the existing xtal wiring
disconnected) - if the rest of the circuit is good, then the
oscillator should start up with no problems - if it doesn't, then
suspect a fault somewhere else. I just pulled
: Wednesday, December 21, 2011 5:28 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Efratom FRK - no 10Mhz oscillator
Yeah, that was why I suggested just sticking a random 10MHz xtal
across the pins on the board (with the existing xtal wiring
disconnected
] On
Behalf Of Peter Bell
Sent: Wednesday, December 21, 2011 5:28 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Efratom FRK - no 10Mhz oscillator
Yeah, that was why I suggested just sticking a random 10MHz xtal
across the pins on the board (with the existing xtal
Of Peter Bell
Sent: Wednesday, December 21, 2011 5:28 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Efratom FRK - no 10Mhz oscillator
Yeah, that was why I suggested just sticking a random 10MHz xtal
across the pins on the board (with the existing xtal wiring
--
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Peter Bell
Sent: Wednesday, December 21, 2011 5:28 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Efratom FRK - no 10Mhz oscillator
Yeah
A little help, pls, from the more experienced. This is my first time into
one of these .I have listened and learned from you' all for some time,
though. It can be intimidating in this close-packed FRK.
I am trying to bring up an Efratom FRK I have had for a while.
The 10 MHz oscillator
Hi, Don
It's been quite a while since I worked on a FRK, but from what I
remember the only signals going to that oscillator board are power and
the control voltage. It might be worth checking the control voltage to
see if it's at a plausible value (nominal is 5V, spec range is 1V-16V,
IIRC) - if
I have some M100s, which are similar, I think. A while back one of
them wouldn't lock, although the oscillator didn't stop. I found a
leaky high-K ceramic cap in the OCXO control loop. I don't have the
correct schematics, so was just shotgunning stuff. I would suspect
those parts and any
10MHz crystals used in OCXO are designed for the temperature of the oven so
it is not possible to find an off-the-shelf suitable crystal. Better find a
crystal coming from an OCXO.
On Tue, Dec 20, 2011 at 7:10 PM, Peter Bell bell.pe...@gmail.com wrote:
Hi, Don
It's been quite a while since I
, December 20, 2011 3:01 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Efratom FRK - no 10Mhz oscillator
10MHz crystals used in OCXO are designed for the temperature of the oven so
it is not possible to find an off-the-shelf suitable crystal. Better find a
crystal
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