From: "Tom Van Baak" <[EMAIL PROTECTED]>
Subject: Re: [time-nuts] RE: phase locking Rb to GPS
Date: Sun, 23 Oct 2005 14:42:39 -0700
Message-ID: <[EMAIL PROTECTED]>
Tom,
> > Indeed, but you can also handle that by using two oscillators, one for
> long-
> >
> Be aware that Brooks can modify the sensitivity of his PIC for a
> rubidium. Brooks has made me several custom PICS for my FRS-C.
See, this makes much more sense to me. His architecture
is fine and when you swap an OCXO for an Rb things like
EFC gain, range, and span are just part of the prob
- Original Message -
From: "Christopher Hoover" <[EMAIL PROTECTED]>
To:
Sent: Sunday, September 18, 2005 10:40 AM
Subject: [time-nuts] RE: phase locking Rb to GPS (was time-nuts Digest, Vol
14, Issue 30)
On 9/18 "Tom Clark, W3IWI" <[EMAIL PROTECTED]>
- Original Message -
From: "Tom Van Baak" <[EMAIL PROTECTED]>
To: "Discussion of precise time and frequency measurement"
Sent: Sunday, October 23, 2005 2:16 PM
Subject: Re: [time-nuts] RE: phase locking Rb to GPS (was time-nuts
Digest,Vol 14, Issue 30)
to this.
/tvb
- Original Message -
From: "Richard H McCorkle" <[EMAIL PROTECTED]>
To: "Discussion of precise time and frequency measurement"
Sent: Saturday, October 22, 2005 19:53
Subject: Re: [time-nuts] RE: phase locking Rb to GPS (was time-nuts
Digest,Vol 14, I
> Indeed, but you can also handle that by using two oscillators, one for
long-
> term stability and one for short-term and lock the short-term to the
long-term
> oscillator with a suitable PLL bandwidth. Comes at some additional cost,
but
> then you can optimize each end better rather than compromi
From: "Robert Lutwak" <[EMAIL PROTECTED]>
Subject: Re: [time-nuts] RE: phase locking Rb to GPS
Date: Sun, 23 Oct 2005 16:43:34 -0400
Message-ID: <[EMAIL PROTECTED]>
> Careful, there's no such thing as a free lunch. Reducing the power to the
> oscillator improv
: "Richard H McCorkle" <[EMAIL PROTECTED]>; "Discussion of precise
time and frequency measurement"
Sent: Sunday, October 23, 2005 2:29 PM
Subject: Re: [time-nuts] RE: phase locking Rb to GPS
Hi Richard:
It's my understanding that this optimization can be done by chang
Richard,
thanks for your answer. I got my OCXO134-12 from eBay (NOS), and so far I
have been unable to find its exact specs, as it is not reported on the
Isotemp Web site (only the -10 is there). An email to them remained without
answer, of course... probably it was a special build for some t
Hi Richard:
It's my understanding that this optimization can be done by changing the
oscillator power level at the crystal.
In the case of the 32768 Hz watch crystal, it must be run a very low
power and it has a very low aging rate when compared to higher frequency
crystals that are typicall
uot;Alberto di Bene" <[EMAIL PROTECTED]>
To: "Discussion of precise time and frequency measurement"
Sent: Sunday, October 23, 2005 7:30 AM
Subject: [time-nuts] RE: phase locking Rb to GPS
> Richard H McCorkle wrote:
>
> > [snip]
> > In interfacing a
Bill Hawkins wrote:
Speaking as a process control engineer, it sounds like
too much gain. You can verify that it is the oven by
warming up the device somehow. That should change the
period of oscillation. If it is still 7 minutes then
reduce the gain somehow.
I can't reduce the gain of the te
frequency measurement
Subject: [time-nuts] RE: phase locking Rb to GPS
Richard H McCorkle wrote:
> [snip]
> In interfacing an Isotemp mil spec version of the HP 10811B with a
> sensitivity of 9.7e-9/volt and a span of 4.85e-8 to the Shera controller
> even with [snip]
Richa
Richard H McCorkle wrote:
[snip]
In interfacing an Isotemp mil spec version of the HP 10811B with a
sensitivity of 9.7e-9/volt and a span of 4.85e-8 to the Shera controller
even with [snip]
Richard,
do you perhaps have any experience of using the Isotemp OCXO134-12 unit ?
I built a GPSDO
10:40 AM
Subject: [time-nuts] RE: phase locking Rb to GPS (was time-nuts Digest, Vol
14, Issue 30)
>
> On 9/18 "Tom Clark, W3IWI" <[EMAIL PROTECTED]> wrote:
>
>The frequency knob that you tweak to correct the Rb frequency
>passes some tens of ma thru a coil surro
> PS. Anyone got the manuals for the frequency-converter XSRM-Z and
> the phase-
> comparator XSRM-Z3? I would enjoy having them. Have the XSRM
> RB-standard and
> XSRM-Z PSU manuals with schematics.
Try www.telford-electronics.com for R&S manuals. (Even if it's not listed
on their website, emai
From: "Brooks Shera" <[EMAIL PROTECTED]>
Subject: Re: [time-nuts] RE: phase locking Rb to GPS
Date: Sun, 18 Sep 2005 15:11:48 -0600
Message-ID: <[EMAIL PROTECTED]>
> Magnus is correct that many Rb's have a voltage
> input EFC control. But in case yours needs a
+5v, to the C-coil connector pin I
wouldn't burnout the C coil.
Regards, Brooks
- Original Message -
From: "Magnus Danielson" <[EMAIL PROTECTED]>
To: ; <[EMAIL PROTECTED]>
Sent: Sunday, September 18, 2005 12:45
Subject: Re: [time-nuts] RE: phase locking Rb to
G
From: "Christopher Hoover" <[EMAIL PROTECTED]>
Subject: [time-nuts] RE: phase locking Rb to GPS (was time-nuts Digest, Vol 14,
Issue 30)
Date: Sun, 18 Sep 2005 11:40:36 -0700
Message-ID: <[EMAIL PROTECTED]>
>
> On 9/18 "Tom Clark, W3IWI" <[EMAIL PROT
On 9/18 "Tom Clark, W3IWI" <[EMAIL PROTECTED]> wrote:
The frequency knob that you tweak to correct the Rb frequency
passes some tens of ma thru a coil surrounding the RF interaction
region. If you try to phase lock a Rb to GPS, you need to develop
a current source error signal.
Hmmm
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