Re: [time-nuts] suggestions on getting 24 Mhz ?

[Mark Spencer]

Hi would anyone be able to point me (off list) in the direction of a bit more 
information re this device ?

Many thanks 

Mark S

m...@alignedsolutions.com
604 762 4099

> On May 8, 2018, at 12:15 AM, Tim Tuck  wrote:
> 
> Hi Pete,
> 
> You probably want this...
> 
> https://github.com/glenenglishgithub/anylockerFS
> 
> 
> Lots of VK's are lining up for the first run of boards to lock their radios.
> 
> regards
> 
> Tim
> 
>> On 11/04/2018 8:00 PM, Pete Lancashire wrote:
>> Needed for SDR project as external clock source.
>> 
>> -pete
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Re: [time-nuts] Fwd: HP 53131A Power Off Mod

[Wayne Holder]

Thanks!   I plan to publish the Gerber files and make them available to fab
at OSH Park as part of an a article I'll put up on my webpage at
https://sites.google.com/site/wayneholder/ but I want to make sure
everything works as expected before I do.  I'm still waiting for parts and
the PCBs to show up and I want to make sure every things works safely, as
AC voltages are involved.  So, it make take a week, or two before I'll know
if I need to fix anything, or redo one of the PCBs.

Wayne

On Mon, May 7, 2018 at 10:27 PM, Tim Tuck  wrote:

> Hi Wayne,
>
> Congrats on a nice simple mod !
>
> I have both a 53131 and 181 in need of these :)
>
> Can you share the gerbers for your PCBs and then I can cut them out on my
> mill.
>
> I could probably make a few for any interested Australians, to save on
> cross pond postage.
>
> thanks
>
> Tim
>
> On 8/05/2018 9:08 AM, Wayne Holder wrote:
>
>> I recently purchased a surplus HP 53131A and was surprised to see that
>> it's
>> designed to stay partially powered on, with the fan running, even when the
>> power switch is in standby.  The manual says this is for timebase
>> temperature stability but, since I plan to use with my Trimble Thunderbolt
>> as the reference source, I don't really need this feature.  So, I decided
>> to see if I could change this.
>>
>
>
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Re: [time-nuts] Simon Winchester: The Perfectionists

[William H. Fite]

Bravo, bravo, bravo! On several occasions I have pointed out that there is
more to time-nuttery than striving to achieve an Allen deviation measured
in zeptoseconds. The silence in response is always deafening. If I want to
struggle with phase angles of billionths of a degree, I can go down to my
basement Chamber of Horrors and do that. But I can also sit in my den and
listen to all my mechanical clocks fighting over who strikes the hour
first. I revel in the cacophony of Westminster, St. Michaels, Whittington,
Rochester, Magdalen, Parsifal chimes all sounding at once, sorting them out
in my head, savoring the dissonances. I dote on the barometric drive of an
Atmos, the twirling of an el cheapo quartz filament clock, the squawking of
a cuckoo, and the constant clatter of a Congreve

I have a cesium clock, rubidium, GPS, etc. in the Chamber and I love
tinkering with them but I will never put a quartz watch on my wrist or an
"atomic" clock, even a 60 cycle synchronous clock on my wall.

Different strokes, I suppose.

Bill


Westminster Quarters, Rochester Quarters, Magdalen Chimes, Parisfal Chimes,
Guildford Chimes

On Tuesday, May 8, 2018, Hal Murray  wrote:

> In 'The Perfectionists' Simon Winchester Looks At History Of Precision
> Engineering
>
> https://www.npr.org/2018/05/07/608590826/in-the-
> perfectionists-simon-wincheste
> r-looks-at-history-of-precision-engineering
>
> KELLY: You write about that in such a personal way in the book. You
> include
> the detail of your Sunday morning ritual, of walking room to room in this
> old
> farmhouse you live in and correcting all the clocks, you know, pushing one
> hand forward a little bit and another hand back, and that you love the
> inaccuracy of that, that they're all chiming totally out of sync by midway
> through the next week.
>
> WINCHESTER: Yes, a lovely description in Dorothy L. Sayers' book "Gaudy
> Night" about the clocks in Oxford chiming midnight in friendly
> disagreement.
> Well, I like clocks having friendly disagreement. I loathe digital watches
> with, I mean, the one I dare say you're looking at in the studio now, with
> microsecond countdowns. Let's take it a bit easier. Let's be a bit fuzzy
> in
> our needs and desires and wishes.
>
> ---
>
> I don't know if the book discusses time.  If you aren't familiar with his
> work, he's good.
>
>
>
> --
> These are my opinions.  I hate spam.
>
>
>
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when it deserves it.
--Mark Twain

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for sinners. His standards are quite low.
--Desmond Tutu
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[time-nuts] Possible new run of TNS-BUF High Isolation, Low Noise Buffer Amp boards

[John Ackermann N8UR]

Back in October, 2016, TAPR did a build-to-order offering of the TNS-BUF 
low noise, high isolation buffer amplifier.  The original 2016 post is 
attached below.  All of those units sold out, and recently I've had a 
few questions about whether more will be available.


TAPR will do another one-off production run if we can get orders for at 
least 25 boards (the minimum to make manufacturing viable) by *June 1*. 
You can place an order by going to http://tapr.org/kits_tns-buf.  The 
price will be the same as the previous production -- $119 plus shipping.


If we receive orders for at least 25 boards by June 1, we will charge 
credit cards and place the production order with our contract 
manufacturer.  If we don't get 25 orders, we'll cancel the project and 
your card will not be charged.


We expect to ship finished TNS-BUF boards about 60 days after placing 
the production order.


Best regards,
John

 Forwarded Message 
Subject: [time-nuts] TNS-BUF High Isolation, Low Noise Buffer Amp Available
Date: Wed, 5 Oct 2016 10:15:46 -0400
From: John Ackermann N8UR 

I've previously mentioned a high performance buffer amplifier called the 
"TNS-BUF" that I built based on a design by Dr. Bruce Griffiths with 
further input from John Miles. Key numbers are:


*  Phase noise -140dBc/Hz at 1 Hertz offset, noise floor -175dBc/Hz.
(PN plot attached)
*  Reverse isolation greater than 100dB; low enough that I can't make a
trustworthy measurement.
*  Gain from -10 to +7 dB from 1 to 30 MHz; maximum output >18dBm.
*  Nominal 18VDC operation, but works down to 12V with lowered
maximum output level.

There's information, including performance data and schematic, at
http://www.febo.com/pages/TNS-BUF

There seems to be some interest in an amplifier like this, so TAPR has 
decided to do a limited production run.  The amp is built with surface 
mount parts, so we thought an assembled and tested board was better than 
a kit.  The price will be $119 each.  But we have no idea how much 
interest there is, and we need to build a minimum of 25 units to make 
production feasible.


So, here's the deal:  you can order your TNS-BUF at

http://tapr.org/kits_tns-buf

through *October 20*.  If we receive orders for at least 25 boards by 
then, we will charge credit cards and place the production order with 
our contract manufacturer.  If we don't get 25 orders, we'll cancel the 
project and credit cards will not be charged.  There's no guarantee that 
boards will be available for later order.


We expect about 60 days between placing the manufacturing order and 
receipt of the boards at TAPR.  We'll ship to customers ASAP after 
receipt.  So that means you can expect to receive your order shortly 
after January 1.


So, go to http://tapr.org/kits_tns-buf now to place your order before 
the deadline!


John


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Re: [time-nuts] Simon Winchester: The Perfectionists

[Poul-Henning Kamp]

In message <20180508073640.64e72406...@ip-64-139-1-69.sjc.megapath.net>, Hal Mu
rray writes:

>about the clocks in Oxford chiming midnight in friendly disagreement. 

Terry Prachett has a lovely description of how the clocks of Ank-Morpork
chimes in "Men At Arms":

Noon in Ankh-Morpork took some time, since twelve o'clock
was established by consensus. Generally, the first bell to
start was that one in the Teachers’ Guild, in response to
the universal prayers of its members. Then the water clock
on the Temple of Small Gods would trigger the big bronze
gong. The black bell in the Temple o Fate struck once,
unexpectedly, but by then the silver pedal-driven carillon
in the Fools’ Guild would be tinkling, the gongs, bells and
chimes of all the guilds and temples would be in full swing,
and it was impossible to tell them apart, except for the
tongueless and magical octiron bell of Old Tom in the Unseen
University clock tower, whose twelve measured silences
temporarily overruled the din.

-- 
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] Simon Winchester: The Perfectionists

[Hal Murray]

In 'The Perfectionists' Simon Winchester Looks At History Of Precision 
Engineering

https://www.npr.org/2018/05/07/608590826/in-the-perfectionists-simon-wincheste
r-looks-at-history-of-precision-engineering

KELLY: You write about that in such a personal way in the book. You include 
the detail of your Sunday morning ritual, of walking room to room in this old 
farmhouse you live in and correcting all the clocks, you know, pushing one 
hand forward a little bit and another hand back, and that you love the 
inaccuracy of that, that they're all chiming totally out of sync by midway 
through the next week.

WINCHESTER: Yes, a lovely description in Dorothy L. Sayers' book "Gaudy 
Night" about the clocks in Oxford chiming midnight in friendly disagreement. 
Well, I like clocks having friendly disagreement. I loathe digital watches 
with, I mean, the one I dare say you're looking at in the studio now, with 
microsecond countdowns. Let's take it a bit easier. Let's be a bit fuzzy in 
our needs and desires and wishes.

---

I don't know if the book discusses time.  If you aren't familiar with his 
work, he's good.



-- 
These are my opinions.  I hate spam.



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Re: [time-nuts] suggestions on getting 24 Mhz ?

[Tim Tuck]

Hi Pete,

You probably want this...

https://github.com/glenenglishgithub/anylockerFS


Lots of VK's are lining up for the first run of boards to lock their radios.

regards

Tim

On 11/04/2018 8:00 PM, Pete Lancashire wrote:

Needed for SDR project as external clock source.

-pete
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