Re: [time-nuts] Efratom FRK - no 10Mhz oscillator

2012-01-04 Thread Don Lewis
-- -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

Re: [time-nuts] Efratom FRK - no 10Mhz oscillator

2012-01-04 Thread lists
: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

Re: [time-nuts] Efratom FRK - no 10Mhz oscillator

2012-01-04 Thread Azelio Boriani
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

Re: [time-nuts] Efratom FRK - no 10Mhz oscillator

2012-01-04 Thread Hal Murray
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

Re: [time-nuts] Efratom FRK - no 10Mhz oscillator

2011-12-21 Thread Peter Bell
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

Re: [time-nuts] Efratom FRK - no 10Mhz oscillator

2011-12-21 Thread Don Lewis
: 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

Re: [time-nuts] Efratom FRK - no 10Mhz oscillator

2011-12-21 Thread Peter Bell
] 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

Re: [time-nuts] Efratom FRK - no 10Mhz oscillator

2011-12-21 Thread Ed Palmer
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

Re: [time-nuts] Efratom FRK - no 10Mhz oscillator

2011-12-21 Thread Don Lewis
-- -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

[time-nuts] Efratom FRK - no 10Mhz oscillator

2011-12-20 Thread Don Lewis
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

Re: [time-nuts] Efratom FRK - no 10Mhz oscillator

2011-12-20 Thread Peter Bell
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

[time-nuts] Efratom FRK - no 10Mhz oscillator

2011-12-20 Thread ed breya
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

Re: [time-nuts] Efratom FRK - no 10Mhz oscillator

2011-12-20 Thread Azelio Boriani
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

Re: [time-nuts] Efratom FRK - no 10Mhz oscillator

2011-12-20 Thread Don Lewis
, 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