[time-nuts] An atomic clock used to measure the height of a mountain

[Tom Leedy via time-nuts]

Hi:


By comparing the tick rate of the portable atomic clock on a mountain with a 
similar clock in a lab in Torino, Italy, researchers at Germany’s National 
Metrology Institute showed that the altitude difference between the two 
locations was about 1,000 meters, or 3,280 feet. Their work was published in 
Nature Physics.  A related article here.


Best --
Tom Leedy - Clarksburg, MD




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Re: [time-nuts] Beware the Casio WaveCeptor analog watch

[Tom Knox]

Hi All;

I have has a Citizen as well and it has been bullet proof skiing, cycling and 
such well over five years. I did a quick search because when I purchased it was 
really pricey but a quick search and Zales has what appears the exact model:

Analog Citizen Eco-Drive® Skyhawk Atomic Titanium Solar 200M Flight Chronograph 
Watch (Model: JY0010-50E) $233 shipped. I know that is a bit more expensive but 
it is amazing.

Cheers;


Thomas Knox




From: time-nuts  on behalf of Bob kb8tq 

Sent: Sunday, February 25, 2018 6:30 PM
To: swith...@alum.mit.edu; Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Beware the Casio WaveCeptor analog watch

Hi

I’ve had the Citizen “Atomic” analog watches for quite a few years. The solar 
powered
versions have gotten a bit better over the years. They nave never had a “hand 
slip”
problem that I have noticed.

Bob

> On Feb 25, 2018, at 6:52 PM, Skip Withrow  wrote:
>
> Hello Time-Nuts,
>
> For many years I owned a Casio WaveCeptor digital watch and like it a
> lot.  The down side was that the battery had to be replaced every few
> years.  And since I had worn it for many years, the plastic case and
> crystal had taken quite a beating.  Finally, the pin holder that
> secures the band broke - end of watch (except as a 'pocket' watch).
>
> So, I went out and bought a solar powered analog version of the
> WaveCeptor (and vowed not to take it caving).  However, several months
> ago I needed to take an action at an exact time (not ebay) which was a
> miserable fail.  I found that the watch was over a minute off.
>
> I went back and explored the watch manual and found that there is a
> procedure to sync the minute and second hands.  I did this and after
> syncing to WWVB all was good.
>
> Now, a couple of months later I needed the precise time again.
> However I checked my watch before hand and found that it was 8 seconds
> off.  Ahrg!
>
> It appears that the stepper motor position of the second and minute
> hands can be jarred out of sync with normal wear bumps and shocks.
> The trouble is you don't know when it happens (unless you check your
> watch against a trusted source often).
>
> Now I'm seriously considering buying a solar version of the digital
> watch to get rid of the problem.
>
> Regards,
> Skip Withrow
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Enterprises
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postings to ...


> and follow the instructions there.

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Re: [time-nuts] Beware the Casio WaveCeptor analog watch

[Bob kb8tq]

Hi

I’ve had the Citizen “Atomic” analog watches for quite a few years. The solar 
powered
versions have gotten a bit better over the years. They nave never had a “hand 
slip” 
problem that I have noticed.

Bob

> On Feb 25, 2018, at 6:52 PM, Skip Withrow  wrote:
> 
> Hello Time-Nuts,
> 
> For many years I owned a Casio WaveCeptor digital watch and like it a
> lot.  The down side was that the battery had to be replaced every few
> years.  And since I had worn it for many years, the plastic case and
> crystal had taken quite a beating.  Finally, the pin holder that
> secures the band broke - end of watch (except as a 'pocket' watch).
> 
> So, I went out and bought a solar powered analog version of the
> WaveCeptor (and vowed not to take it caving).  However, several months
> ago I needed to take an action at an exact time (not ebay) which was a
> miserable fail.  I found that the watch was over a minute off.
> 
> I went back and explored the watch manual and found that there is a
> procedure to sync the minute and second hands.  I did this and after
> syncing to WWVB all was good.
> 
> Now, a couple of months later I needed the precise time again.
> However I checked my watch before hand and found that it was 8 seconds
> off.  Ahrg!
> 
> It appears that the stepper motor position of the second and minute
> hands can be jarred out of sync with normal wear bumps and shocks.
> The trouble is you don't know when it happens (unless you check your
> watch against a trusted source often).
> 
> Now I'm seriously considering buying a solar version of the digital
> watch to get rid of the problem.
> 
> Regards,
> Skip Withrow
> ___
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Re: [time-nuts] Beware the Casio WaveCeptor analog watch

[Tim Shoppa]

I had the black plastic digital LCD (no hands) waveceptor for 5+ years and
my only complaint about it was the short life of the Casio watch bands and
replacements which rarely lasted longer than a year.

3 years ago I upgraded to a Solar-powered Waveceptor WVA-640 with a metal
band and am very happy with it. It syncs to WWVB every morning 1-3AM all
the way out here on East Coast, and I have never observed it being off by a
fraction of a second during the day.

I have had other (Seiko) watch-hand watches that I had to do the
jiggling-the-hand-stepper-motor-to-be-in-sync thing - but only after
exposure to very close AC magnetic fields. Being within a few feet of large
multi-thousand-amp transformer windings, or just inches of a magnetic tape
degausser, can drive any analog hand watch bonkers, not just the stepper
motor ones. Skip, is it possible that your hand alignment problems are
because you were working near large AC or pulsing DC currents?

Tim N3QE

On Sun, Feb 25, 2018 at 6:52 PM, Skip Withrow 
wrote:

>  Hello Time-Nuts,
>
> For many years I owned a Casio WaveCeptor digital watch and like it a
> lot.  The down side was that the battery had to be replaced every few
> years.  And since I had worn it for many years, the plastic case and
> crystal had taken quite a beating.  Finally, the pin holder that
> secures the band broke - end of watch (except as a 'pocket' watch).
>
> So, I went out and bought a solar powered analog version of the
> WaveCeptor (and vowed not to take it caving).  However, several months
> ago I needed to take an action at an exact time (not ebay) which was a
> miserable fail.  I found that the watch was over a minute off.
>
> I went back and explored the watch manual and found that there is a
> procedure to sync the minute and second hands.  I did this and after
> syncing to WWVB all was good.
>
> Now, a couple of months later I needed the precise time again.
> However I checked my watch before hand and found that it was 8 seconds
> off.  Ahrg!
>
> It appears that the stepper motor position of the second and minute
> hands can be jarred out of sync with normal wear bumps and shocks.
> The trouble is you don't know when it happens (unless you check your
> watch against a trusted source often).
>
> Now I'm seriously considering buying a solar version of the digital
> watch to get rid of the problem.
>
> Regards,
> Skip Withrow
> ___
> time-nuts mailing list -- time-nuts@febo.com
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> mailman/listinfo/time-nuts
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[time-nuts] Beware the Casio WaveCeptor analog watch

[Skip Withrow]

 Hello Time-Nuts,

For many years I owned a Casio WaveCeptor digital watch and like it a
lot.  The down side was that the battery had to be replaced every few
years.  And since I had worn it for many years, the plastic case and
crystal had taken quite a beating.  Finally, the pin holder that
secures the band broke - end of watch (except as a 'pocket' watch).

So, I went out and bought a solar powered analog version of the
WaveCeptor (and vowed not to take it caving).  However, several months
ago I needed to take an action at an exact time (not ebay) which was a
miserable fail.  I found that the watch was over a minute off.

I went back and explored the watch manual and found that there is a
procedure to sync the minute and second hands.  I did this and after
syncing to WWVB all was good.

Now, a couple of months later I needed the precise time again.
However I checked my watch before hand and found that it was 8 seconds
off.  Ahrg!

It appears that the stepper motor position of the second and minute
hands can be jarred out of sync with normal wear bumps and shocks.
The trouble is you don't know when it happens (unless you check your
watch against a trusted source often).

Now I'm seriously considering buying a solar version of the digital
watch to get rid of the problem.

Regards,
Skip Withrow
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Re: [time-nuts] Replacement Backup Battery for 5065A?

[Scott McGrath]

On 5065A backup batteries,  The  Batteries Plus does a good job of rebuilding 
HP/Agilent battery packs.

I paid 125 a couple years ago to have my 5065A pack rebuilt.   



On Feb 25, 2018, at 2:41 PM, Stan  wrote:

With all this recent 5065A talk I decided to pull mine out of storage and fire 
it up. After a little time to let everything warm up and settle in, I'm happy 
to report that it's working just fine!

My 5065A has the battery backup option, and the battery is the original one 
(1420-0066, Energy Sales p/n ES710, 25.2V 1.4 Ah). Not surprisingly, the 
battery is quite dead. Does anyone any insight about installing a more modern 
battery (SLA or NiMH, perhaps) that will fit in the battery compartment in the 
5065A?

I've looked at a few small 12V/2.2Ah SLA batteries that are physically small 
enough that I should be able to fit a couple in the enclosure and connect them 
in series to get 24 volts out, but I want to wait until either I have assurance 
from someone with more experience than I that this will actually work, or a 
better idea about a more suitable replacement.

Thanks,
Stan

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Re: [time-nuts] FRK

[ewkehren via time-nuts]

Thank you I am presently only on my tablet I will be on my laptop in the 
morning do not think that there is much interest hardware or solder iron 1%Bert


Sent from my Galaxy Tab® A
 Original message From: Arnold Tibus  
Date: 2/25/18  11:04 AM  (GMT-05:00) To: time-nuts@febo.com Subject: Re: 
[time-nuts] FRK 
Bert, you may upload it to this directory, which timenuts can then 
access and download as well, using this directory also:
https://my.hidrive.com/share/5fohndsi4k
The up- and downloads are much faster and there is no Mbit limit.
I will keep it open for a while. Give me a note if this ok for you.
Try it.
Of course, from time to time I will clean up a bit.

Regards,

Arnold, DK2WT

Am 25.02.2018 um 15:05 schrieb ewkehren via time-nuts:
> We have pictures of the guts of a M100 the file is 1.8 M off list or 
> permission to postBert Kehren
> 
> 
> Sent from my Galaxy Tab® A
> ___
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> 

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Re: [time-nuts] Replacement Backup Battery for 5065A?

[Clay Autery]

I don't know what your package requirement is, but I would at least LOOK at 
LiFePO as a solution.  These guys provide all my radio related batteries...
https://www.bioennopower.com/collections/24v-series-lifepo4-lithium-iron-phosphate-batteries/products/24v-10ah-lfp-battery-abs-blf-2410ts
The smallest 24vdc I see is 10 Ahr, but they are very responsive and will 
either help you out or send you in the right direction.


Sent from my Verizon, Samsung Galaxy smartphone
 Original message From: Stan  Date: 
2/25/18  13:41  (GMT-06:00) To: time-nuts@febo.com Subject: [time-nuts] 
Replacement Backup Battery for 5065A? 
With all this recent 5065A talk I decided to pull mine out of storage and fire 
it up. After a little time to let everything warm up and settle in, I'm happy 
to report that it's working just fine!

My 5065A has the battery backup option, and the battery is the original one 
(1420-0066, Energy Sales p/n ES710, 25.2V 1.4 Ah). Not surprisingly, the 
battery is quite dead. Does anyone any insight about installing a more modern 
battery (SLA or NiMH, perhaps) that will fit in the battery compartment in the 
5065A?

I've looked at a few small 12V/2.2Ah SLA batteries that are physically small 
enough that I should be able to fit a couple in the enclosure and connect them 
in series to get 24 volts out, but I want to wait until either I have assurance 
from someone with more experience than I that this will actually work, or a 
better idea about a more suitable replacement.

Thanks,
Stan

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Re: [time-nuts] Replacement Backup Battery for 5065A?

[ewkehren via time-nuts]

Discooect I have seen them leak all over the placeBert Kehren 


Sent from my Galaxy Tab® A
 Original message From: Stan  Date: 
2/25/18  2:41 PM  (GMT-05:00) To: time-nuts@febo.com Subject: [time-nuts] 
Replacement Backup Battery for 5065A? 
With all this recent 5065A talk I decided to pull mine out of storage and fire 
it up. After a little time to let everything warm up and settle in, I'm happy 
to report that it's working just fine!

My 5065A has the battery backup option, and the battery is the original one 
(1420-0066, Energy Sales p/n ES710, 25.2V 1.4 Ah). Not surprisingly, the 
battery is quite dead. Does anyone any insight about installing a more modern 
battery (SLA or NiMH, perhaps) that will fit in the battery compartment in the 
5065A?

I've looked at a few small 12V/2.2Ah SLA batteries that are physically small 
enough that I should be able to fit a couple in the enclosure and connect them 
in series to get 24 volts out, but I want to wait until either I have assurance 
from someone with more experience than I that this will actually work, or a 
better idea about a more suitable replacement.

Thanks,
Stan

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Re: [time-nuts] Replacement Backup Battery for 5065A?

[Bob kb8tq]

Hi

One very practical option: Pull the battery and don’t replace it. When the unit
next comes out of storage, run it on a very normal UPS. The battery was
a fine idea back in the era when this gear was newly designed. These days,
the better option is an external “bulk” backup. 

If you are going to run 24/7/365, the charger circuit in all of these gizmos (HP
liked battery backup …..) is not the best for long term battery survival. It’s 
not
awful, but it’s not what you would do today. If the unit goes into storage most 
of 
the time, batteries really don’t like that very much either. 

Bob

> On Feb 25, 2018, at 2:41 PM, Stan  wrote:
> 
> With all this recent 5065A talk I decided to pull mine out of storage and 
> fire it up. After a little time to let everything warm up and settle in, I'm 
> happy to report that it's working just fine!
> 
> My 5065A has the battery backup option, and the battery is the original one 
> (1420-0066, Energy Sales p/n ES710, 25.2V 1.4 Ah). Not surprisingly, the 
> battery is quite dead. Does anyone any insight about installing a more modern 
> battery (SLA or NiMH, perhaps) that will fit in the battery compartment in 
> the 5065A?
> 
> I've looked at a few small 12V/2.2Ah SLA batteries that are physically small 
> enough that I should be able to fit a couple in the enclosure and connect 
> them in series to get 24 volts out, but I want to wait until either I have 
> assurance from someone with more experience than I that this will actually 
> work, or a better idea about a more suitable replacement.
> 
> Thanks,
> Stan
> 
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Re: [time-nuts] Replacement A9 boards for the HP 5065A

[Gerhard Hoffmann]

Am 25.02.2018 um 13:46 schrieb Azelio Boriani:

The part number BFC234421475, on 
seems to be a Philips product, 2500 available, for 49.28 UAH
(Ukrainian Hryvnia, that is 1.77 USD). A mysterious capacitor...

Why not go to Mouser or DK, as usual?

Or to the source itself:
<  https://www.wima.de/en/  >

(Abt. an hour of driving from where I'm now).

BTW last time I bought some at DK/Mouser, there was
a pricing artefact, in that 5% was cheaper than 10%

:-)  Gerhard


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Re: [time-nuts] Replacement Backup Battery for 5065A?

[Dr. Ulrich L. Rohde via time-nuts]

Yes, a lot of activity !

Ulrich 

Sent from my iPhone

> On Feb 25, 2018, at 2:41 PM, Stan  wrote:
> 
> With all this recent 5065A talk I decided to pull mine out of storage and 
> fire it up. After a little time to let everything warm up and settle in, I'm 
> happy to report that it's working just fine!
> 
> My 5065A has the battery backup option, and the battery is the original one 
> (1420-0066, Energy Sales p/n ES710, 25.2V 1.4 Ah). Not surprisingly, the 
> battery is quite dead. Does anyone any insight about installing a more modern 
> battery (SLA or NiMH, perhaps) that will fit in the battery compartment in 
> the 5065A?
> 
> I've looked at a few small 12V/2.2Ah SLA batteries that are physically small 
> enough that I should be able to fit a couple in the enclosure and connect 
> them in series to get 24 volts out, but I want to wait until either I have 
> assurance from someone with more experience than I that this will actually 
> work, or a better idea about a more suitable replacement.
> 
> Thanks,
> Stan
> 
> ___
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[time-nuts] Replacement Backup Battery for 5065A?

[Stan]

With all this recent 5065A talk I decided to pull mine out of storage and fire 
it up. After a little time to let everything warm up and settle in, I'm happy 
to report that it's working just fine!

My 5065A has the battery backup option, and the battery is the original one 
(1420-0066, Energy Sales p/n ES710, 25.2V 1.4 Ah). Not surprisingly, the 
battery is quite dead. Does anyone any insight about installing a more modern 
battery (SLA or NiMH, perhaps) that will fit in the battery compartment in the 
5065A?

I've looked at a few small 12V/2.2Ah SLA batteries that are physically small 
enough that I should be able to fit a couple in the enclosure and connect them 
in series to get 24 volts out, but I want to wait until either I have assurance 
from someone with more experience than I that this will actually work, or a 
better idea about a more suitable replacement.

Thanks,
Stan

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Re: [time-nuts] FRK

[Arnold Tibus]

Bert, you may upload it to this directory, which timenuts can then 
access and download as well, using this directory also:

https://my.hidrive.com/share/5fohndsi4k
The up- and downloads are much faster and there is no Mbit limit.
I will keep it open for a while. Give me a note if this ok for you.
Try it.
Of course, from time to time I will clean up a bit.

Regards,

Arnold, DK2WT

Am 25.02.2018 um 15:05 schrieb ewkehren via time-nuts:

We have pictures of the guts of a M100 the file is 1.8 M off list or permission 
to postBert Kehren


Sent from my Galaxy Tab® A
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[time-nuts] FRK

[ewkehren via time-nuts]

We have pictures of the guts of a M100 the file is 1.8 M off list or permission 
to postBert Kehren 


Sent from my Galaxy Tab® A
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[time-nuts] FRK

[ew via time-nuts]

attached a picture of the open FRK
Bert Kehren___
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Re: [time-nuts] Replacement A9 boards for the HP 5065A

[Azelio Boriani]

The part number BFC234421475, on 
seems to be a Philips product, 2500 available, for 49.28 UAH
(Ukrainian Hryvnia, that is 1.77 USD). A mysterious capacitor...

On Sun, Feb 25, 2018 at 12:35 PM, Charles Steinmetz
 wrote:
> Interesting.  I'm inclined to say I stand corrected, BUT:  (i) as Mark
> noted, the datasheet link points to the datasheet for Vishay FC Series HF
> thin-film resistors [which are really excellent low-reactance T/F resistors,
> if you need any]; (ii) I cannot find any reference to PC caps on the
> Vishay/BC web site; and (iii) other distributors do not list this cap (or
> any Vishay/BC PC caps, for that matter).
>
> I did discover Electronic Concepts (ECI) (https://www.ecicaps.com/), who
> claim to make their own PC film and do seem to supply three series of PC
> caps.  They seem mainly to make them to order, but they have small
> quantities of some parts in stock.  Prices are by quotation, so I don't know
> what they charge.  I assume they are pretty pricey, and if they run out of
> an in-stock cap there may be a minimum order to get more.
>
> So, I do stand corrected.
>
> All that said, PP and PPS are the best choices for the A9 integrator
> project.
>
> Best regards,
>
> Charles
>
>
>
> On 2/24/2018 9:35 PM, Mark Sims wrote:
>>
>> For a while, all makers of polycarbonate caps got out of the business.
>> The US government had to step in and get involved... apparently they are
>> used in a lot of explody thingies, etc.
>>
>> Mouser shows one (around $7 for a 4.7 uF cap):
>>
>> https://www.mouser.com/ProductDetail/Vishay-BC-Components/BFC234421475?qs=XPb5zkzE6%252bBS9mv3hRFZcw%3d%3d
>>
>> But, the datasheet link goes to a resistor...
>> ___
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Re: [time-nuts] Replacement A9 boards for the HP 5065A

[Charles Steinmetz]

Interesting.  I'm inclined to say I stand corrected, BUT:  (i) as Mark 
noted, the datasheet link points to the datasheet for Vishay FC Series 
HF thin-film resistors [which are really excellent low-reactance T/F 
resistors, if you need any]; (ii) I cannot find any reference to PC caps 
on the Vishay/BC web site; and (iii) other distributors do not list this 
cap (or any Vishay/BC PC caps, for that matter).


I did discover Electronic Concepts (ECI) (https://www.ecicaps.com/), who 
claim to make their own PC film and do seem to supply three series of PC 
caps.  They seem mainly to make them to order, but they have small 
quantities of some parts in stock.  Prices are by quotation, so I don't 
know what they charge.  I assume they are pretty pricey, and if they run 
out of an in-stock cap there may be a minimum order to get more.


So, I do stand corrected.

All that said, PP and PPS are the best choices for the A9 integrator 
project.


Best regards,

Charles


On 2/24/2018 9:35 PM, Mark Sims wrote:

For a while, all makers of polycarbonate caps got out of the business.   The US 
government had to step in and get involved... apparently they are used in a lot 
of explody thingies, etc.

Mouser shows one (around $7 for a 4.7 uF cap):
https://www.mouser.com/ProductDetail/Vishay-BC-Components/BFC234421475?qs=XPb5zkzE6%252bBS9mv3hRFZcw%3d%3d

But, the datasheet link goes to a resistor...
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Re: [time-nuts] Replacement A9 boards for the HP 5065A

[ewkehren via time-nuts]

Corby is still asleep, on the old board it was 0.5 uF and 100K now 5 uF and 
10K. Who knows what HP knew in the 60`s but it works and I dought that it is 
critical. No where is there any fine  tuning like two resistors in seriesBert 
Kehren 

Sent from my Galaxy Tab® A
 Original message From: Bill Hawkins  
Date: 2/24/18  10:26 PM  (GMT-05:00) To: 'Discussion of precise time and 
frequency measurement'  Subject: Re: [time-nuts] 
Replacement A9 boards for the HP 5065A 
Corby

A time constant is calculated from R and C.

If 50 milliseconds is the correct number, R for 5 mfd is 10,000 ohms.

You could use an aluminum electrolytic for the capacitor.

Can you tell us where the 50 ms number came from?

Regards,
Bill Hawkins


-Original Message-
From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of
cdel...@juno.com
Sent: Saturday, February 24, 2018 5:45 PM
To: time-nuts@febo.com
Subject: [time-nuts] Replacement A9 boards for the HP 5065A

Hi,

I'm working to make some replacement A9 boards for the HP 5065A to the
new style schematic.

Will share the Gerber file when done.

The integrator capacitor is a 1986 vintage TRW 5.0ufd 50V 10%
.42"DX1.0"L axial.

Of course it has an HP part number and no manufactures #.

Any guess as to what type it is?

Polycarbonate, polypropylene, ???

Just wanting to find a good modern replacement for its use. (Integrator
with a 50ms time constant.)

Thanks,

Corby

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Re: [time-nuts] "Super Rubidium" filter mod for PRS-10?

[ewkehren via time-nuts]

I still stand by FRK, next to HP largest cell, Corby did it with a M 100 much 
more difficult. I started on a FRK but because of a macular hole in my left eye 
had to stop.First  test  should be to change time constant and monitor 
performance.Remember the outstanding performance  of the HP is do to the fact 
that the optical unit takes over somewhere around 0.1 seconds.FRK is well 
documented and easy to work on.We have pictures have to compress to attach to 
time nuts or contact me off list.Again if some one wants to take over please 
contact me directBert Kehren 


Sent from my Galaxy Tab® A
 Original message From: Poul-Henning Kamp  
Date: 2/25/18  5:22 AM  (GMT-05:00) To: Discussion of precise time and 
frequency measurement , Stewart Cobb 
 Subject: Re: [time-nuts] "Super Rubidium" filter mod 
for PRS-10? 

In message 
, Stewart 
Cobb writes:

>What about the SRS PRS-10? By some indications, it's the best
>current-production rubidium around. It doesn't have separate filter and
>resonance cells, but other than that it seems like a good design. And the
>time constants and such are digitally tunable. Is the PRS-10 worth trying
>the filter mod on?

Apart from being able to fit the filter in mechanically, the only risk
I see is that the microcontroller might know the correct ratio of "stray"
light to "signal" light and get upset.

-- 
Poul-Henning Kamp   | UNIX since Zilog Zeus 3.20
p...@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.
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Re: [time-nuts] "Super Rubidium" filter mod for PRS-10?

[Poul-Henning Kamp]

In message 
, Stewart 
Cobb writes:

>What about the SRS PRS-10? By some indications, it's the best
>current-production rubidium around. It doesn't have separate filter and
>resonance cells, but other than that it seems like a good design. And the
>time constants and such are digitally tunable. Is the PRS-10 worth trying
>the filter mod on?

Apart from being able to fit the filter in mechanically, the only risk
I see is that the microcontroller might know the correct ratio of "stray"
light to "signal" light and get upset.

-- 
Poul-Henning Kamp   | UNIX since Zilog Zeus 3.20
p...@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.
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[time-nuts] "Super Rubidium" filter mod for PRS-10?

[Stewart Cobb]

Corby has said more than once that it's not worth doing the "super 5065"
optical filter mod to small telecon rubidiums, because they have too many
other compromises in their designs.

What about the SRS PRS-10? By some indications, it's the best
current-production rubidium around. It doesn't have separate filter and
resonance cells, but other than that it seems like a good design. And the
time constants and such are digitally tunable. Is the PRS-10 worth trying
the filter mod on?

Cheers!
--Stu
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