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PICList Thread
'[OT] PING'
1998\09\22@035510 by Jacques Vrey

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Just Pinging ..... to see if I get an acknowledge - so please ignore

Jacques Vrey
AST Applied Information Technologies
Iscor Profile Products
Post Point 74
PO Box 2
Newcastle
South Africa
2940
TEL:+27 (0)3431 48759
FAX:+27 (0)3431 48001
spam_OUTjacquesvTakeThisOuTspamit.new.iscorltd.co.za
The views expressed above are not
necessarily those of AST or Iscor Limited.


'[OT] PING'
1998\10\02@151741 by Steve Smith
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PONG !


'[OT] ping'
2005\12\18@031507 by Shawn Wilton
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Just maintaining my subscription to this list.

--


Shawn Wilton (b9 Systems)
http://black9.net

2005\12\18@034720 by Vidal

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Shawn Wilton wrote:

>Just maintaining my subscription to this list.
>  
>
Me too.

--
Regards

Vidal


'[OT] ping'
2009\01\28@004211 by Vitaliy
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Eerie silence...

2009\01\28@005652 by Tony Vandiver

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clatter, bang, bang

Vitaliy wrote:
> Eerie silence...
>  

2009\01\28@010429 by Jinx

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> Eerie silence...

Really ? I heard a ping from somewhere

2009\01\28@011130 by J FLETCHER

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OK, so where does "ping" originate? Sonar? Radar?
 
John

--- On Wed, 28/1/09, Jinx <.....joecolquittKILLspamspam@spam@clear.net.nz> wrote:

From: Jinx <joecolquittspamKILLspamclear.net.nz>
Subject: Re: [OT] ping
To: "Microcontroller discussion list - Public." <.....piclistKILLspamspam.....mit.edu>
Date: Wednesday, 28 January, 2009, 7:02 AM

> Eerie silence...

Really ? I heard a ping from somewhere

2009\01\28@011848 by Jinx

face picon face
> OK, so where does "ping" originate? Sonar? Radar?

Not sure. There's a 'pong' around here too. But I know where
that came from

2009\01\28@043538 by Picbits Sales

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>> OK, so where does "ping" originate? Sonar? Radar?
>
> Not sure. There's a 'pong' around here too. But I know where
> that came from
>
> --

Sorry - that was me :-P

2009\01\28@132043 by Peter

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J FLETCHER <jfletcher427 <at> btinternet.com> writes:
> OK, so where does "ping" originate? Sonar? Radar?

Early sonar wasn't ultrasound, they used an audio amplifier/phones (possibly
sound powered) and whacked a steel bar with a hammer to 'send'. Sounds like a
ping. The return echo has fewer high frequency components and sounds duller,
thus pong.

Peter


2009\01\28@132726 by J FLETCHER

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Fascinating! My first "experience" of what sonar (sorry, I expect it's SONAR)
sounds like was from watching the TV series "Voyage to the bottom of the sea".
I loved that sound. Being a nuclear powered sub, I expect they were whacking a
uranium bar.
 
John

--- On Wed, 28/1/09, Peter <EraseMEplpeter2006spam_OUTspamTakeThisOuTyahoo.com> wrote:

From: Peter <plpeter2006spamspam_OUTyahoo.com>
Subject: Re: [OT] ping
To: @spam@piclistKILLspamspammit.edu
Date: Wednesday, 28 January, 2009, 6:20 PM

J FLETCHER <jfletcher427 <at> btinternet.com> writes:
> OK, so where does "ping" originate? Sonar? Radar?

Early sonar wasn't ultrasound, they used an audio amplifier/phones
(possibly
sound powered) and whacked a steel bar with a hammer to 'send'. Sounds
like a
ping. The return echo has fewer high frequency components and sounds duller,
thus pong.

Peter

2009\01\31@221224 by Peter

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J FLETCHER <jfletcher427 <at> btinternet.com> writes:
> Fascinating! My first "experience" of what sonar (sorry, I expect it's SONAR)
> sounds like was from  ...

My first impressions of echo from a whacked piece of metal came from being on a
boat anchored in a quiet place and someone working on another boat, hitting
something hard with a hammer. The echos came from a small freighter's side about
50-60 meters off. It was ping-pong alright. I suppose that the higher
frequencies get lost faster because of dispersion, the same as it happens with
light. Afaik the first gear used for submarine 'echolocation' was sound powered
phones and later amplified ones originally built for artillery fire location and
used as such in WW1.

Also afaik most modern marine sonar uses audible frequencies. The lower
frequencies go farther but the higher ones allow better directivity and higher
power with a given size of array at short distance. So it's a compromise. It is
certain that WW2 era sonar and asdic were audible to submarine crews, but I do
not know if what they heard was the pulse proper or cavitation or something else
caused by it.

Some links:

http://en.wikipedia.org/wiki/Sonar
www.dself.dsl.pipex.com/MUSEUM/COMMS/ear/ear.htm
http://www.sonarshack.org/SonarMilestones.lasso (Hydrophone use in WW1)
http://science.jrank.org/pages/6289/SONAR-Historical-development-SONAR.html

(aside: this is good: http://science.jrank.org/)

Wrt uranium bar whacking, apparently the Homer Simpson character's workplace and
'activity' was inspired by someone involved with the 3 mile island
near-Chernobyl accident, according to a book I recently read.

Peter



'[OT] Ping'
2009\03\10@220400 by Vitaliy
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Sorry, it is way too quiet.

2009\03\10@224131 by pic

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Maybe people doing work instead of chatting LOL Shock horror!!!

-----Original Message-----
From: KILLspampiclist-bouncesKILLspamspamMIT.EDU [RemoveMEpiclist-bouncesTakeThisOuTspamMIT.EDU] On Behalf Of
Vitaliy
Sent: Wednesday, March 11, 2009 3:03 PM
To: piclist
Subject: [OT] Ping

Sorry, it is way too quiet.

2009\03\10@224255 by Jake Anderson

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Vitaliy wrote:
> Sorry, it is way too quiet.
>  
you didn't get the memo about the new list?
;-P

2009\03\11@000038 by Vitaliy

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Jake Anderson wrote:
>> Sorry, it is way too quiet.
>>  
> you didn't get the memo about the new list?
> ;-P

What?! <:-O


2009\03\11@000642 by Vitaliy

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pic@gavin-egan.com wrote:
> Maybe people doing work instead of chatting LOL Shock horror!!!

After I've been accidentally unsubscribed (twice) yesterday, I'm kind of
paranoid.

Yeah, I know -- PICList is my favorite procrastination location. I'm
counting on Asimov's theory of "subconscious doing the work in the
background while you're watching a movie or sleep [or post nonsense on the
PICList]" to help me get out of the hole I programmed myself into. Beats
helplessly staring at the code in MPLAB. :-)

Vitaliy


'[OT] ping'
2010\07\15@083420 by sergio masci
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ping

2010\07\15@084256 by Carl Denk

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Pong :)

On 7/15/2010 12:42 PM, sergio masci wrote:
> ping
>    

2010\07\15@092752 by Michael Watterson

face picon face
 On 15/07/2010 17:42, sergio masci wrote:
> ping
Booooiiiinnnggggg...... splut

2010\07\15@094516 by Alan B Pearce

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>   On 15/07/2010 17:42, sergio masci wrote:
> > ping
> Booooiiiinnnggggg...... splut

No, that won't get you to the table tennis Olympics ... ;))
--
Scanned by iCritical.

2010\07\15@102717 by RussellMc

face picon face
> ping

Ack.

FWIW - if somebody is having list access problems then a copy to their
reply-to address is often useful, as they may not be able to see any
list posts, including the responses.

                R

2010\07\15@124943 by RussellMc

face picon face
It worked:

Sergio responded:

Hi Russell,

This is an offlist response.

Thanks for the reply. My DNS host is broken so my domains became
invisible. I have now switched to another DNS host so my domains (some of
them) are visible again. However the PICLIST server is not sending me
anything. Thanks for the copy. If you are posting this to the PICLIST
please do NOT include my private email address.
____________

So, I didn't :-)

2010\07\15@125353 by rolf

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Hi Sergio.

Not sure what you were trying to accomplish with your ping, but since you
asked.... it seems that your computer's (or perhaps your mail server's)
system clock is fast. Thuis may have a bearing on any issues you are
experiencing.

I have the following headers from your original mail:

Received: from dmz-mailsec-scanner-4.mit.edu (DMZ-MAILSEC-SCANNER-4.MIT.EDU
       [18.9.25.15])
       by mailhub-dmz-4.mit.edu (8.13.8/8.9.2) with ESMTP id o6FCYCo0023142
       for <spamBeGonepiclistspamBeGonespammit.edu>; Thu, 15 Jul 2010 08:34:20 -0400
X-AuditID: 1209190f-b7bd9ae0000009fe-05-4c3f004b1a10
Received: from mail.allotrope.net (allotrope.net [82.70.139.137])
       by dmz-mailsec-scanner-4.mit.edu (Symantec Brightmail Gateway) with
       SMTP id 75.2F.02558.B400F3C4; Thu, 15 Jul 2010 08:34:19 -0400 (EDT)
Received: by mail.allotrope.net (Postfix, from userid 2002)
       id 0DFF347AFA; Thu, 15 Jul 2010 17:42:02 +0100 (BST)
Received: from localhost (localhost [127.0.0.1])
       by mail.allotrope.net (Postfix) with ESMTP id 0215B47A77
       for <TakeThisOuTpiclistEraseMEspamspam_OUTmit.edu>; Thu, 15 Jul 2010 17:42:01 +0100 (BST)
Date: Thu, 15 Jul 2010 17:42:01 +0100 (BST)
From: sergio masci <RemoveMEsmplxspamTakeThisOuTallotrope.net>
To: "Microcontroller discussion list - Public." <piclistEraseMEspam.....mit.edu>
Subject: [OT] ping



Now, the RFC2822 spec (section 3.3) indicates that:

  The time-of-day specifies the number of hours, minutes, and
  optionally seconds since midnight of the date indicated.

  The date and time-of-day SHOULD express local time.

  The zone specifies the offset from Coordinated Universal Time (UTC,
  formerly referred to as "Greenwich Mean Time") that the date and
  time-of-day represent.  The "+" or "-" indicates whether the
  time-of-day is ahead of (i.e., east of) or behind (i.e., west of)
  Universal Time.  The first two digits indicate the number of hours
  difference from Universal Time, and the last two digits indicate the
  number of minutes difference from Universal Time.  (Hence, +hhmm
  means +(hh * 60 + mm) minutes, and -hhmm means -(hh * 60 + mm)
  minutes).  The form "+0000" SHOULD be used to indicate a time zone at
  Universal Time.  Though "-0000" also indicates Universal Time, it is
  used to indicate that the time was generated on a system that may be
  in a local time zone other than Universal Time and therefore
  indicates that the date-time contains no information about the local
  time zone.

What this is telling me is that you sent the mail at:  Thu, 15 Jul 2010
17:42:01 +0100 (BST)

This is the same as Thu, 15 Jul 2010 16:42:01 +0000   (Universal time)

Now, the piclist server, in Boston, I believe, received your mail at: Thu,
15 Jul 2010 08:34:19 -0400 (EDT)
This is the same as Thu, 15 Jul 2010 12:34:19 +0000   (universal time)

This tells me that your mail server's clock is a full 4 hours fast.

4 hours fast is a *lot*.

Perhaps your problem lies in that.

Rolf


On Thu, 15 Jul 2010 17:42:01 +0100 (BST), sergio masci
<EraseMEsmplxspamallotrope.net> wrote:
> ping
> -

2010\07\15@133515 by sergio masci

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On Thu, 15 Jul 2010, rolf wrote:

> Hi Sergio.
>
> Not sure what you were trying to accomplish with your ping, but since you
> asked.... it seems that your computer's (or perhaps your mail server's)
> system clock is fast. Thuis may have a bearing on any issues you are
> experiencing.

Hi Rolf,

Thanks for the input, yes I need to correct the clock but that's not the
problem.

I discovered today that my DNS host is broken so my domains became
invisible. I have now switched to another DNS host so my domains (some of
them) are visible again. However the PICLIST server is not sending me
anything. Thanks for copying me directly otherwise I would not have
received your post.

Regards
Sergio Masci

2010\07\15@152407 by Steve Smith

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Sending 34 Gb of data

4h 36m 24S 19mS 50% loss

Its not a good connection...

Steve

-----Original Message-----
From: RemoveMEpiclist-bouncesEraseMEspamEraseMEmit.edu [RemoveMEpiclist-bouncesspam_OUTspamKILLspammit.edu] On Behalf Of
sergio masci
Sent: 15 July 2010 17:42
To: Microcontroller discussion list - Public.
Subject: [OT] ping

ping

2010\07\16@030113 by cdb

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:::: Booooiiiinnnggggg...... splut
::::
:: No, that won't get you to the table tennis Olympics ... ;))

That reminds me of a Derek and Clive skit about Zebberdee and Florence from
The Magic Roundabout.

Colin
--
cdb, RemoveMEcolinTakeThisOuTspamspambtech-online.co.uk on 16/07/2010

Web presence: http://www.btech-online.co.uk  

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