Reply by julius ●March 10, 20142014-03-10
On Saturday, March 8, 2014 2:20:00 PM UTC-5, mnentwig wrote:

> >> Continuous mud wave telemetry achieves unprecedented data transmission
> 
> rates of 6 to 16 bits per second.
> 
> 
> 
> heh... my cellular "power" amplifier is maybe a little faster. But then,
> 
> this one won't lose a wrestling match against an electric toothbrush...	 
> 
> 
> 


Ha, unfortunately I can't tell you the sorts of things our PA have had to wrestle against ... !!! 

They use about low hundreds of watts depending on the exact setting, and we have the distance record of around 13km. The record is being broken all the time with the many horizontal ultra-long distance wells being drilled. 

Here's one from a few years ago that a had nice number: 12,345m.

https://www.slb.com/news/press_releases/2011/2011_0421_q1_earnings.aspx
http://news.exxonmobil.com/press-release/sakhalin-1-project-drills-worlds-longest-extended-reach-well
Reply by robert bristow-johnson ●March 8, 20142014-03-08
On 3/8/14 2:20 PM, mnentwig wrote:

>>> Continuous mud wave telemetry achieves unprecedented data transmission
> rates of 6 to 16 bits per second.
>
> heh... my cellular "power" amplifier is maybe a little faster. But then,
> this one won't lose a wrestling match against an electric toothbrush...	
>


wtf ??

i musta missed something.


-- 

r b-j                  rbj@audioimagination.com

"Imagination is more important than knowledge."
Reply by mnentwig ●March 8, 20142014-03-08
>> Continuous mud wave telemetry achieves unprecedented data transmission

rates of 6 to 16 bits per second.

heh... my cellular "power" amplifier is maybe a little faster. But then,
this one won't lose a wrestling match against an electric toothbrush...	 

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Reply by Eric Jacobsen ●March 5, 20142014-03-05
On Wed, 5 Mar 2014 06:30:19 -0800 (PST), clay@claysturner.com wrote:


>On Tuesday, March 4, 2014 8:52:23 PM UTC-5, julius wrote:
>> On Tuesday, March 4, 2014 7:46:35 PM UTC-5, Eric Jacobsen wrote:
>> 
>> > On Tue, 04 Mar 2014 14:42:18 -0600, "mnentwig" <24789@dsprelated>
>> 
>> > 
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>> > wrote:
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>> > >it works for the geologists...
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>> > >engineers whine about peak-to-average ratio... real men use dynamite...	 
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>> > That's a very special class of Power Amplifier, though.   ;)
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>> > Eric Jacobsen
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>> > Anchor Hill Communications
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>> > http://www.anchorhill.com
>> 
>> 
>> 
>> Real men use this kind of Power Amplifier.
>> 
>> 
>> 
>> http://www.slb.com/services/drilling/mwd_lwd/mwd/powerpulse.aspx
>
>Quite interesting! Definitely a niche application.
>
>Clay


Julius gets to play with the cool toys.   ;)



Eric Jacobsen
Anchor Hill Communications
http://www.anchorhill.com
Reply by ●March 5, 20142014-03-05
On Tuesday, March 4, 2014 8:52:23 PM UTC-5, julius wrote:

> On Tuesday, March 4, 2014 7:46:35 PM UTC-5, Eric Jacobsen wrote:
> 
> > On Tue, 04 Mar 2014 14:42:18 -0600, "mnentwig" <24789@dsprelated>
> 
> > 
> 
> > wrote:
> 
> > 
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> > 
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> > 
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> > >it works for the geologists...
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> > 
> 
> > >engineers whine about peak-to-average ratio... real men use dynamite...	 
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> > 
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> > That's a very special class of Power Amplifier, though.   ;)
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> > Eric Jacobsen
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> > 
> 
> > Anchor Hill Communications
> 
> > 
> 
> > http://www.anchorhill.com
> 
> 
> 
> Real men use this kind of Power Amplifier.
> 
> 
> 
> http://www.slb.com/services/drilling/mwd_lwd/mwd/powerpulse.aspx


Quite interesting! Definitely a niche application.

Clay
Reply by ●March 5, 20142014-03-05
On Tuesday, March 4, 2014 7:46:35 PM UTC-5, Eric Jacobsen wrote:

> On Tue, 04 Mar 2014 14:42:18 -0600, "mnentwig" <24789@dsprelated>
> 
> wrote:
> 
> 
> 
> >it works for the geologists...
> 
> >engineers whine about peak-to-average ratio... real men use dynamite...	 
> 
> 
> 
> That's a very special class of Power Amplifier, though.   ;)
> 
> 
> 
> 
> 
> Eric Jacobsen
> 
> Anchor Hill Communications
> 
> http://www.anchorhill.com


Makes me think of "Aerodynamics are for people who can't build engines" Enzo Ferrari
Reply by julius ●March 4, 20142014-03-04
On Tuesday, March 4, 2014 7:46:35 PM UTC-5, Eric Jacobsen wrote:

> On Tue, 04 Mar 2014 14:42:18 -0600, "mnentwig" <24789@dsprelated>
> 
> wrote:
> 
> 
> 
> >it works for the geologists...
> 
> >engineers whine about peak-to-average ratio... real men use dynamite...	 
> 
> 
> 
> That's a very special class of Power Amplifier, though.   ;)
> 
> 
> 
> 
> 
> Eric Jacobsen
> 
> Anchor Hill Communications
> 
> http://www.anchorhill.com


Real men use this kind of Power Amplifier.

http://www.slb.com/services/drilling/mwd_lwd/mwd/powerpulse.aspx
Reply by Eric Jacobsen ●March 4, 20142014-03-04
On Tue, 04 Mar 2014 14:42:18 -0600, "mnentwig" <24789@dsprelated>
wrote:


>it works for the geologists...
>engineers whine about peak-to-average ratio... real men use dynamite...	 


That's a very special class of Power Amplifier, though.   ;)


Eric Jacobsen
Anchor Hill Communications
http://www.anchorhill.com
Reply by mnentwig ●March 4, 20142014-03-04
it works for the geologists...
engineers whine about peak-to-average ratio... real men use dynamite...	 

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Reply by julius ●March 4, 20142014-03-04
On Thursday, February 27, 2014 11:56:32 AM UTC-5, gyans...@gmail.com wrote:

> There is a large literature on estimating and equalizing comms channels with everything from LMS to higher order stats. It occurred to me, why not just fire an impulse or string of them into the channel instead and then average the result.
> 
> That would give you the coefficients of a ma model whether it is min or nm phase. I assume the problem is noise but that too should average out.


Most systems are limited by peak power. 
Most systems are limited by dynamic range. 
Most algorithms suffer from poor time-bandwidth product.