[time-nuts] time-nuts Digest, Vol 180, Issue 2

Tue Jul 2 16:33:58 UTC 2019

Hello,I have a Cesium tube...please see the attache file... I offer anybody who is taking a the tube from Hungary....... it is free of charge.. but I can not sentvia post........ I have no info about the PRS 50 unit......Please contact me  offline.
Brgds Ernie.

-----Original Message-----
From: time-nuts-request <time-nuts-request at lists.febo.com>
To: time-nuts <time-nuts at lists.febo.com>
Sent: Tue, 2 Jul 2019 18:00
Subject: time-nuts Digest, Vol 180, Issue 2

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Today's Topics:

  1. Re: Are there any company selling refurbished/reconditioned
      Cesium tubes? (Bob kb8tq)
  2. Re: Are there any company selling refurbished/reconditioned
      Cesium tubes? (Glen English VK1XX)
  3. Chuck Little (of HP Cesium fame) just passed away
      (Richard (Rick) Karlquist)
  4. Re: Chuck Little (of HP Cesium fame) just passed away
      (Jeremy Nichols)
  5. TimeLab phase difference (slope sec/sec) (Chris Burford)

----------------------------------------------------------------------

Message: 1
Date: Mon, 1 Jul 2019 12:45:59 -0400
From: Bob kb8tq <kb8tq at n1k.org>
To: Taka Kamiya <tkamiya9 at yahoo.com>, Discussion of precise time and
    frequency measurement <time-nuts at lists.febo.com>
Subject: Re: [time-nuts] Are there any company selling
    refurbished/reconditioned Cesium tubes?
Message-ID: <77A854B5-12F2-4C5F-87C3-38C085B57FD2 at n1k.org>
Content-Type: text/plain;    charset=utf-8

Hi

I don?t have a Datum, my Cs standards are both HP?s. On the HP?s there is a front panel meter that 
will let you know what?s going on.  I believe the Datum?s have a serial port and some sort of commands
to get them to spit out what?s going on.

Bob

> On Jul 1, 2019, at 10:41 AM, Taka Kamiya via time-nuts <time-nuts at lists.febo.com> wrote:
> 
> I bought it from a local seller for $600.  He was selling "untested".  I went there personally to make sure it locks.  I still don't know how much is left though.  As Tom said, I'll just enjoy it while it works.  There is no way I'll buy this kind of thing with that kind of price from eBay.  Too scary and the loss is too high.  (and remedy is often impossible)
> 
> There is no provision to measure beam current.  I also have no knowledge of what it should be.  Can you possibly instruct me?
> 
> --------------------------------------- 
> (Mr.) Taka Kamiya
> I'm stuck in a wormhole....  Hello, worms! 
> 
>    On Monday, July 1, 2019, 9:35:49 AM EDT, Bob kb8tq <kb8tq at n1k.org> wrote:  
> 
> Hi
> 
> There are a lot of posts back in the archives about various things on Cs standards. 
> 
> Beam current is probably the best way to see ?how much is left?. On a high performance
> tube, it drops pretty fast at end of life. That makes is a bit of an iffy measure there. If the unit has been 
> in storage for a while, it may take a week to pump down to even get working ?.. (and see the beam 
> current). 
> 
> Most Cs standards you see for sale on eBay are listed as ?parts only?. They may work, they may not work.
> The price is likely to be in the $1,000 to $3,000 range delivered. As soon as one gets listed as ?working? the
> price goes through the roof ( like 5x to 10X). Since there is no test for ?how much is left?, I?m not sure that is 
> a good price to pay. 
> 
> So your choice is to pay a silly price on one that may last a couple months ( or may go on for years) or
> to pay a low price for who knows what. On the one with the silly price, you might be able to get some info.
> On the reasonable price units, the seller is probably not going to do much. 
> 
> From time to time, they show up here on the list. In that case the seller likely knows a bit more about 
> the unit than the typical eBay listing. Even so, there are no guarantees. A unit that was working very 
> well on the seller?s bench may run out of steam a few months later.
> 
> Bob
> 
>> On Jun 30, 2019, at 6:20 PM, Glen English VK1XX <glenlist at pacificmedia.com.au> wrote:
>> 
>> Bob, are there any URLs you can point to, or provide advice on, if inspecting a Cesium for sale, is there an hour counter, or other metrics that can be measured in the tube department ? (I am familiar with TWTs, Klystrons etc so the HV doesnt bother me)  in order to ascertain the level of life left ?
>> 
>> that is, apart from turning it on and waiting a while and measuring ADEV for a week.... on the sellers premises.
>> 
>> glen
>> 
>> 
>> On 1/07/2019 7:09 AM, Bob kb8tq wrote:
>>> Hi
>>> 
>>> Based on several replacements on a ?high performance? 5071 ?. 6 to 7 years of 24/7/365 seems to
>>> be about the point things start to get flakey. Maybe not dead, but crazy enough that it lets you know
>>> it needs a new tube ( = ADEV is not even close to what it should be ..).
>>> 
>>> Cost several years back for the swap out was right at $40K. The process included hazmat shipping
>>> silly nonsense. That part delayed the process by almost 2 months.
>>> 
>>> Bob
>>> 
>> 
>> 
>> 
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> 
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------------------------------

Message: 2
Date: Tue, 2 Jul 2019 06:27:46 +1000
From: Glen English VK1XX <glenlist at pacificmedia.com.au>
To: time-nuts at lists.febo.com
Subject: Re: [time-nuts] Are there any company selling
    refurbished/reconditioned Cesium tubes?
Message-ID: <d1280750-0671-812c-01b2-b613651241ef at pacificmedia.com.au>
Content-Type: text/plain; charset=utf-8; format=flowed

Bob, thanks for the info. I will immerse myself in the archives.

regards,

glen.

VK1XX / AI6UM

On 1/07/2019 11:15 PM, Bob kb8tq wrote:
> Hi
>
> There are a lot of posts back in the archives about various things on Cs standards.
>
> Beam current is probably the best way to see

------------------------------

Message: 3
Date: Mon, 1 Jul 2019 14:00:39 -0700
From: "Richard (Rick) Karlquist" <richard at karlquist.com>
To: Discussion of precise time and frequency measurement
    <time-nuts at lists.febo.com>
Subject: [time-nuts] Chuck Little (of HP Cesium fame) just passed away
Message-ID: <9534ea7e-faf5-bac0-7d47-44bfa27c3175 at karlquist.com>
Content-Type: text/plain; charset=utf-8; format=flowed

Hugh Rice posted a very nice write up on Chuck Little
earlier this year on this reflector.  I just heard
about his passing.  He started work at HP in 1956!

Rick Karlquist

------------------------------

Message: 4
Date: Mon, 1 Jul 2019 15:24:50 -0700
From: Jeremy Nichols <jn6wfo at gmail.com>
To: Discussion of precise time and frequency measurement
    <time-nuts at lists.febo.com>
Subject: Re: [time-nuts] Chuck Little (of HP Cesium fame) just passed
    away
Message-ID:
    <CAPv4gjQLf8NMw1765coLVLsgmf=jQiXo2F81huBNcm5pKo6zvQ at mail.gmail.com>
Content-Type: text/plain; charset="UTF-8"

My wife (Laura Cline) worked for Chuck for a time at HP.

Jeremy Nichols

On Mon, Jul 1, 2019 at 3:05 PM Richard (Rick) Karlquist <
richard at karlquist.com> wrote:

> Hugh Rice posted a very nice write up on Chuck Little
> earlier this year on this reflector.  I just heard
> about his passing.  He started work at HP in 1956!
>
> Rick Karlquist
>
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> and follow the instructions there.
>
-- 
Jeremy Nichols
Sent from my iPad 6.

------------------------------

Message: 5
Date: Tue, 2 Jul 2019 09:17:15 -0500
From: Chris Burford <cburford1 at austin.rr.com>
To: Time Nuts Listings <time-nuts at lists.febo.com>
Subject: [time-nuts] TimeLab phase difference (slope sec/sec)
Message-ID: <c1dc4c9a-d4a3-f594-8237-61e113e3b630 at austin.rr.com>
Content-Type: text/plain; charset=utf-8; format=flowed

Is the slope value for the phase difference shown in TimeLab an average 
of the overall data sample duration? The reason I ask is that my service 
manual for my RFS says:

/"//A faster way to make the comparison between the reference frequency 
and the DUT is to use the time interval measurement mode of the 
counters. In this case, the time intervals between the 10MHz zero 
crossings of the reference frequency and the DUT are measured and 
averaged. If this time interval changes by less than 10ps per second, 
then the DUT is within 1 part in //10^11 of the frequency reference."/

I'm just curious if the phase difference slope value can be plugged in 
to this equation.

Regards,

Chris

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