[time-nuts] Rb lamp lifetime...

bbobb mokai nhbbobb at gmail.com
Mon Nov 3 19:23:51 UTC 2008 

Hello Roy
Thanks,I am Bob also the fluke.l on ebay.Most of the gentlemans at here seem
have known me.

As the Time-nuts member .if any  member buy any stuff on my ebay store.
if you Directly use the  Paypal not from ebay,i will  offer 5 % discount .

and if my goods have any problem and No Function when you get.just tell me.
let me solve it.

Most of time,just pay me the shipping fee will ok.i send the replacement.

About some one say how i can get so many Rubidium oscillator for selling .

This Q

Most of the Rb , from USA ,the every lucent's or Nortel's BTS have one Rb as
standard.


Thanks and best regards
Bob

2008/11/3 <time-nuts-request at febo.com>

> Send time-nuts mailing list submissions to
>        time-nuts at febo.com
>
> To subscribe or unsubscribe via the World Wide Web, visit
>        https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> or, via email, send a message with subject or body 'help' to
>        time-nuts-request at febo.com
>
> You can reach the person managing the list at
>        time-nuts-owner at febo.com
>
> When replying, please edit your Subject line so it is more specific
> than "Re: Contents of time-nuts digest..."
>
>
> Today's Topics:
>
>   1. Re: Testing frequency using NTP (M. Warner Losh)
>   2. Re: Testing frequency using NTP (M. Warner Losh)
>   3. Re: Jackson Labs Fury & Isotemp OCXO134-10 (SAIDJACK at aol.com)
>   4. Re: What's the time Mr Wolf... (Hal Murray)
>   5. Re: Testing frequency using NTP (Poul-Henning Kamp)
>   6. Re: Isotemp 134-10 & Fury (Richard Moore)
>   7. Re: What's the time Mr Wolf... (Bj?rn Gabrielsson)
>   8. Re: Rb lamp lifetime... (Roy Phillips)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Sun, 02 Nov 2008 19:32:46 -0700 (MST)
> From: "M. Warner Losh" <imp at bsdimp.com>
> Subject: Re: [time-nuts] Testing frequency using NTP
> To: time-nuts at febo.com, wittend at wwrinc.com
> Message-ID: <20081102.193246.-625041382.imp at bsdimp.com>
> Content-Type: Text/Plain; charset=us-ascii
>
> In message: <490E4F2C.30201 at wwrinc.com>
>            "David M. Witten II" <wittend at wwrinc.com> writes:
> : Will a usable build of FreeBSD 7.x run in the memory available on the
> : older Soekris boards? (64 MB RAM)
>
> No.  My router/dhcp server, mail forwarding anti-spam agent, external
> DNS server are all on my soekris 4521.  I'm running 7.0 on it.  It
> only has 64MB of memory and I've never had memory problems.
>
> Warner
>
>
>
> ------------------------------
>
> Message: 2
> Date: Sun, 02 Nov 2008 19:38:15 -0700 (MST)
> From: "M. Warner Losh" <imp at bsdimp.com>
> Subject: Re: [time-nuts] Testing frequency using NTP
> To: time-nuts at febo.com, wittend at wwrinc.com
> Message-ID: <20081102.193815.1887074052.imp at bsdimp.com>
> Content-Type: Text/Plain; charset=us-ascii
>
> In message: <20081102.193246.-625041382.imp at bsdimp.com>
>            "M. Warner Losh" <imp at bsdimp.com> writes:
> : In message: <490E4F2C.30201 at wwrinc.com>
> :             "David M. Witten II" <wittend at wwrinc.com> writes:
> : : Will a usable build of FreeBSD 7.x run in the memory available on the
> : : older Soekris boards? (64 MB RAM)
> :
> : No.  My router/dhcp server, mail forwarding anti-spam agent, external
> : DNS server are all on my soekris 4521.  I'm running 7.0 on it.  It
> : only has 64MB of memory and I've never had memory problems.
>
> Errr, I should have said 'Yes.' My no was answering the question 'Will
> it run out of memory?'
>
> %vmstat
>  procs      memory      page                   disk   faults      cpu
>  r b w     avm    fre  flt  re  pi  po  fr  sr ad0   in   sy  cs us sy id
>  0 0 0   38492  22576    2   0   0   0   1   0   0 1354   25 488  1  3 96
>
> Warner
>
>
>
> ------------------------------
>
> Message: 3
> Date: Sun, 2 Nov 2008 22:56:29 EST
> From: SAIDJACK at aol.com
> Subject: Re: [time-nuts] Jackson Labs Fury & Isotemp OCXO134-10
> To: time-nuts at febo.com
> Message-ID: <bc2.362c22e6.363fd06d at aol.com>
> Content-Type: text/plain; charset="US-ASCII"
>
> Hi Bill,
>
> thanks for sending the datasheets.
>
> Looks like the unit has nominally +/-6Hz EFC range, slightly less than the
> OCXO's we typically use.
>
> I would thus try increasing the DAC Gain to about 30 to 40 and see how that
> works.
>
> bye,
> Said
>
>
> In a message dated 11/2/2008 18:06:18 Pacific Standard Time,
> wb6bnq at cox.net
> writes:
>
> Said,
>
> Find attached two PDF files of the specs, drawing and  pinout for the
> Isotemp
>  134-10.
>
> Bill....WB6BNQ
>
>
>
> _______________________________________________
> time-nuts  mailing list -- time-nuts at febo.com
> To unsubscribe, go to
> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the  instructions there.
>
>
>
> ------------------------------
>
> Message: 4
> Date: Mon, 03 Nov 2008 00:21:38 -0800
> From: Hal Murray <hmurray at megapathdsl.net>
> Subject: Re: [time-nuts] What's the time Mr Wolf...
> To: Discussion of precise time and frequency measurement
>        <time-nuts at febo.com>
> Message-ID: <20081103082139.4E8B1BCD5 at ip-64-139-1-69.sjc.megapath.net>
> Content-Type: text/plain; charset=us-ascii
>
>
> > So everything is derived from this oscillator, which is actually
> > 10.22999999543 MHz. This -4.57 mHz corrects for relativistic effects.
>
> Neat.  Thanks.
>
> I got curious.  How does that compare to the Doppler shifts?
>
> google found this nice description of GPS :
>  http://www.go.ednet.ns.ca/~larry/gps/gps_talk.html<http://www.go.ednet.ns.ca/%7Elarry/gps/gps_talk.html>
>
> It says the Doppler shift is up to 2400 HZ.
>
> That's a half-million times the relativistic correction.
>
>
>
>
> --
> These are my opinions, not necessarily my employer's.  I hate spam.
>
>
>
>
>
>
> ------------------------------
>
> Message: 5
> Date: Mon, 03 Nov 2008 08:51:27 +0000
> From: "Poul-Henning Kamp" <phk at phk.freebsd.dk>
> Subject: Re: [time-nuts] Testing frequency using NTP
> To: Discussion of precise time and frequency measurement
>        <time-nuts at febo.com>
> Message-ID: <40399.1225702287 at critter.freebsd.dk>
>
> In message <490E4F2C.30201 at wwrinc.com>, "David M. Witten II" writes:
>
> >Can I still expect to see similar performance using more recent versions
> >of FreeBSD than you originally used?
>
> Yes, the timestamping is done in hardware, so it does not depend on
> the OS version.
>
> >Will a usable build of FreeBSD 7.x run in the memory available on the
> >older Soekris boards? (64 MB RAM)
>
> Absolutely.
>
> >I understand that there are features that made boards incorporating the
> >133 MHz AMD ElanSC520 processors suitable for this purpose.  Are these
> >features still present in the newer AMD Geode LX based boards?
>
> No.
>
> >Though I know that you have worked with Soekris products a lot, is there
> >any reason that the same techniques cannot be applied to the WRAP and
> >ALIX boards from PCEngines?  or perhaps an One Laptop Per Child (OLPC) XO?
>
> It all comes down to the special counter hardware in the Elan520 CPU,
> any board with an Elan520 where you can get at the timer1 pin is fine.
>
> --
> Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
> phk at FreeBSD.ORG         | TCP/IP since RFC 956
> FreeBSD committer       | BSD since 4.3-tahoe
> Never attribute to malice what can adequately be explained by incompetence.
>
>
>
> ------------------------------
>
> Message: 6
> Date: Mon, 3 Nov 2008 01:05:04 -0800
> From: Richard Moore <richiem at hughes.net>
> Subject: Re: [time-nuts] Isotemp 134-10 & Fury
> To: time-nuts at febo.com
> Message-ID: <FC568505-8BA8-4762-B644-49EFE3736986 at hughes.net>
> Content-Type: text/plain; charset=US-ASCII; delsp=yes; format=flowed
>
> The Isotemp 134-10 *may* have a screw in the side of the case that
> gives access to a trimmer for the frequency. You can set your Fury to
> an EFC output of 2.5V and try adjusting the trimmer for 10MHz or as
> close as you can get it. This will optimize your control range from
> the Fury, with the proviso that the Isotemp's control slope is not
> linear. My OFC version does not have the access port, but it it a
> much earlier model than the Isotemp 134. The Isotemp has a positive
> control slope -- increasing EFC increases frequency. Mine has an EFC
> sensitivity of about 2E-7 per Volt.
>
> Dick Moore
>
>
> > From: Matt Osborn <_kc0ukk at msosborn.com_
> > (mailto:kc0ukk at msosborn.com) >
> > Date:  November 1, 2008 23:28:34 PDT
> > To: time-nuts <_time-nuts at febo.com_ (mailto:time-nuts at febo.com) >
> > Subject:  [time-nuts] Jackson Labs Fury & Isotemp  OCXO134-10
> > Reply-To: Discussion of precise time and frequency  measurement
> > <_time-nuts at febo.com_ (mailto:time-nuts at febo.com) >
> >
> > I think that I've managed to keep a low profile here, trusting  that I
> > would learn more if I refrained from random  interjections of
> > ill-informed thoughts.  However, there  comes a point in every  man's
> > life...
> >
> > A year or two  ago, I took advantage of Said's offer and purchased one
> > of  the Jackson Labs OEM external OCXO Fury units and am
> > attempting  to
> > put it to work. I've decided to use an Isotemp OCXO134-10  oscillator
> > and have several decisions which I would like to  vet with those of
> > you
> > that have been down this road  before.
> >
> > The Isotemp unit has an EFC range  of 0 to 8 Volts; the Fury has an
> > EFC
> > range of 0 to 5 volts.  Using my HP 53131A, I'm able to adjust the
> > Isotemp to  10 MHz +- 5 mHz with an EFC voltage of 4.64 volts.
> > That  is
> > within the adjustment range of the Fury, but I'm not sure  of the
> > accuracy of the HP53131A.  Should I construct a  resistive network ala
> > Brooks Shera to 'boost' the EFC range  just in case or would I be
> > better off just using the Fury  'as is'?
> >
> > Secondly, the Jackson Labs advises  that since the Fury uses the
> > external oscillator as its  clock, that the oscillator should be
> > powered up before the  Fury itself.  I was hoping that I would be able
> > to use  a single power switch to power both the oscillator and the
> > Fury
> > simultaneously, but now I'm not so  sure.
> >
> > Finally, are there any of you that  have used the Isotemp OXCO134-10
> > with the Fury?  Have  any of you worked out the various SERVO settings
> > that the  Fury makes available?  I'm interested in the  DAC gain,  EFC
> > scale, EFC dampening and Phase  compensation.
> >
> > Any and all advice will be  gratefully accepted.
> >
> > -- kc0ukk at msosborn  dot  com
> >
>
>
>
> ------------------------------
>
> Message: 7
> Date: Mon, 03 Nov 2008 12:07:07 +0100
> From: Bj?rn Gabrielsson <bg at lysator.liu.se>
> Subject: Re: [time-nuts] What's the time Mr Wolf...
> To: Discussion of precise time and frequency measurement
>        <time-nuts at febo.com>
> Message-ID: <1225710427.6068.13.camel at bg-desktop>
> Content-Type: text/plain; charset=utf-8
>
> On Mon, 2008-11-03 at 00:21 -0800, Hal Murray wrote:
> > > So everything is derived from this oscillator, which is actually
> > > 10.22999999543 MHz. This -4.57 mHz corrects for relativistic
> > effects.
> >
> > Neat.  Thanks.
> >
> > I got curious.  How does that compare to the Doppler shifts?
> >
> > google found this nice description of GPS :
> >   http://www.go.ednet.ns.ca/~larry/gps/gps_talk.html<http://www.go.ednet.ns.ca/%7Elarry/gps/gps_talk.html>
> >
> > It says the Doppler shift is up to 2400 HZ.
> >
> > That's a half-million times the relativistic correction.
>
> There is also about 1 kHz frequency uncertainty from the crystal driving
> the GPS receiver. As most receivers use oscillators specified at about
> 0.5ppm.
>
> btw... I once heard a story that early GPS SVs could turn off the
> relativistic compensation. There was also a switch to reverse the
> sign... ;-)
>
> --
>
>    Bj?rn
>
>
>
>
> ------------------------------
>
> Message: 8
> Date: Mon, 3 Nov 2008 11:43:43 -0000
> From: "Roy Phillips" <phill.r1 at btinternet.com>
> Subject: Re: [time-nuts] Rb lamp lifetime...
> To: "Discussion of precise time and frequency measurement"
>        <time-nuts at febo.com>
> Message-ID: <E2CC0DFDEE7442B58F24331DE0D634AC at LapTop>
> Content-Type: text/plain; format=flowed; charset="Windows-1252";
>        reply-type=original
>
> David
>
> I would suggest that you email Bob Mokia ,(China) ,directly at
> mokia1985 at gmail.com  requesting his "best" price. I obtained my TBolt from
> this source. It was a 2004 issue, and in excellent condition. It has been
> performing superbly for the past three weeks, and in my case it had
> replaced
> my Odetics 325.
> I trust I am not breaking the rules by making this suggestion, but I was
> also disappointed when I failed to obtain a TBolt through TAPR when the
> offers were made.
>
> Roy Phillips
>
> ----- Original Message -----
> From: "David M. Witten II" <wittend at wwrinc.com>
> To: <time-nuts at febo.com>; <wb6bnq at cox.net>
> Sent: Monday, November 03, 2008 1:28 AM
> Subject: [time-nuts] Rb lamp lifetime...
>
>
>
> How much would be reasonable to pay for one of these on EBay?  I see
> someone asking $259 for one.  I'm sure that TAPR's price was much
> better, but I wasn't paying attention.
>
> Dave Witten
>
>
>
> WB6BNQ wrote:
>
>
> Yuri,
>
> Sorry about that, but I guess the Trimble Thunderbolts are out of stock
> all ready.
>
> Bill....WB6BNQ
>
>
> WB6BNQ wrote:
>
>  > Hi Yuri,
>  >
>  > Unless you need the longer term stability of an undisciplined Rb
> source, I think
>  > you would be better served to get one of the ?Timenuts group? Trimble
> Thunderbolt
>  > GPS units to use as a home standard.  It is available via this page:
>  >
>
> _______________________________________________
> time-nuts mailing list -- time-nuts at febo.com
> To unsubscribe, go to
> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.
>
>
>
>
>
> ------------------------------
>
> _______________________________________________
> time-nuts mailing list
> time-nuts at febo.com
> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
>
> End of time-nuts Digest, Vol 52, Issue 10
> *****************************************
>

More information about the time-nuts mailing list