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PRC as a amplifier in GPS question.

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server
Guest

Tue Jun 07, 2005 9:23 am   



message unavailable

Ken Taylor
Guest

Tue Jun 07, 2005 9:23 am   



"sommes" <lkj_at_jk.com> wrote in message
news:42a552ca$0$621$5a62ac22_at_per-qv1-newsreader-01.iinet.net.au...
Quote:
Could you please help to understand
1) what is the relationship of background noise and PRC noise
2) Could anyone explain how does it work?

Thank you very much



The Psuedo-Random Code spreads the L1 carrier (as in CDMA), so that when the

receiver applies the correct code (each GPS satellite has a different code)
to the received signal, the L1 'pops out'.

What text are you using? There should be an explanation of how information
theory is used on the coded signal to 'amplify' the signal while leaving the
noise at essentially zero.

Ken

Alan Peake
Guest

Tue Jun 07, 2005 9:23 am   



Quote:
I'm toying with the idea of building a chronometer for measuring bullet speed.
Just want to get some opinions on the best type of sensors to use.

Most chronographs use "sky screens". These are just photodiodes at the bottom
of a slit so they see a small piece of sky. When a bullet passes over them,
the diode changes it's resistance slightly. Each diode in one design is
in a feedback circuit of an op-amp with AGC to take care of varying ambient
light. The op-amp outputs are squared up and then the digital circuitry is
straightforward. Mine uses a clock of 4 MHz and the screens are about 300mm
apart. Accurate to about +/- 5 feet per second under most conditions.
Cheap chronographs in Aust used to be the CHRONY brand and the base model was
around $140.
Alan

Alan Peake
Guest

Tue Jun 07, 2005 9:23 am   



Quote:
Well, well, the people you meet 'round here!

Ian.
Well g'day Ian! Long time no see. How's the FB list these days?

I've taken up F-Class so I might get back on it.
Cheers,
Alan

Alan Peake
Guest

Tue Jun 07, 2005 9:23 am   



Quote:
The two simplest ways are optical and microwave. Optical is cheap and
simple.

Actually, an even cheaper and simpler system was the old "Break Screen" system
where two fire wire grids were set up a known distance apart. The bullet
breaks the wire as it passes through. The disadvantage was having to replace
the wires for each shot. The advent of the sky screens rendered the break
screens obsolete.
Alan

Death Eater Dan
Guest

Tue Jun 07, 2005 9:23 am   



probably just wreck the amp output

"Deamond" <bariko_at_des_oon.net> wrote in message
news:g2_Ja.1786$78.65630_at_news.siol.net...
Quote:
Hi..

What happens if I connect one Car Ignition coil
as a sound speaker to my radio?

:)



Mike Harding
Guest

Tue Jun 07, 2005 9:23 am   



On 22 Jun 2003 07:09:28 GMT, "Fat Crack Ho"
<s363281_at_student.uq.edu.au> wrote:

Quote:
I got a PCB made for my motor control circuit. It works fine when connected to
a delta connected resistive load but has issues when connected to an ungrounded
star load.

Any thoughts?

Check the value of the local caps. for the MOSFET drivers,
I don't know about the IR parts but the last MOSFET drivers
I used (Maxim?) recommended 10u minimum. Gate drive
series resistors seem to be a (surprisingly!) contentious
subject but I suggest you try about 10R. Double (treble!)
check your PCB layout with regard to the high current paths,
ensure they have good returns directly to the PSU and that
nothing else is being affected by them.

And, like the others said, sort out your schematic - if that's
messy (and it is) chances are your board will be too.

Mike Harding

Rudolf Ladyzhenskii
Guest

Tue Jun 07, 2005 9:23 am   



Sounds like an interference or power supply filtering problem.

First, remove all brown glue from PCB. Then check electrolitic capcitors.

Rudolf

"John Ely." <zamiac_at_sympac.com.au> wrote in message
news:3ef8066d_at_news.leadingedgeinternet.net.au...
Quote:
Hello,
A Bridge (KTX) CAG-664SG 17" has a fine pattern of horizontal
lines drifting up or down the screen, has anyone fixed this in one of
these.

Cheers John Ely.



Dave Horsfall
Guest

Tue Jun 07, 2005 9:23 am   



On Tue, 24 Jun 2003, cdb wrote:

Quote:
no no I haven't missed your point, but I though I was being helpful in at
least you might be able to find out what the product codes related to.

Rule #1 in this newsgroup: don't bother correcting Allison, as like any
other psycho he takes it personally and responds with abuse. As you'll
soon see...

-- Dave

Phil Allison
Guest

Tue Jun 07, 2005 9:23 am   



"Dave Horsfall" <daveh_at_ci.com.au> wrote in message
news:20030625104655.I36623_at_mippet.ci.com.au...
Quote:
On Tue, 24 Jun 2003, cdb wrote:

no no I haven't missed your point, but I though I was being helpful in
at
least you might be able to find out what the product codes related to.

Rule #1 in this newsgroup: don't bother correcting Allison, as like any
other psycho he takes it personally and responds with abuse. As you'll
soon see...



** The Horse's Arse is only interested in abusing people - he is one of
usenet's lowest POS.



............. Phil

Spudley
Guest

Tue Jun 07, 2005 9:23 am   



It could be a shocking experience.

"Deamond" <bariko_at_des_oon.net> wrote in message
news:g2_Ja.1786$78.65630_at_news.siol.net...
Quote:
Hi..

What happens if I connect one Car Ignition coil
as a sound speaker to my radio?

:)



Dave Horsfall
Guest

Tue Jun 07, 2005 9:23 am   



On Wed, 25 Jun 2003, Phil Allison wrote:

Quote:
Rule #1 in this newsgroup: don't bother correcting Allison, as like any
other psycho he takes it personally and responds with abuse. As you'll
soon see...

** The Horse's Arse is only interested in abusing people - he is one of
usenet's lowest POS.

QED.

-- Dave

Phil Allison
Guest

Tue Jun 07, 2005 9:23 am   



"Dave Horsfall" <daveh_at_ci.com.au> wrote in message
news:20030625123254.E36623_at_mippet.ci.com.au...
Quote:
On Wed, 25 Jun 2003, Phil Allison wrote:

Rule #1 in this newsgroup: don't bother correcting Allison, as like
any
other psycho he takes it personally and responds with abuse. As
you'll
soon see...

** The Horse's Arse is only interested in abusing people - he is
one of
usenet's lowest POS.

QED.



** You insult me for fun - I tell the NG the facts about you.


The deal is that simple.


............. Phil

Xygt
Guest

Tue Jun 07, 2005 9:23 am   



Thanks all for your advice. Sorry, I did forget to mention that it is a gas
heater, so it looks like I have to call the Vulcan tech after all. Thanks
again.

Regards,
Xygt
"Xygt" <xygt3_at_hotmail.com> wrote in message
news:3ef69533_at_dnews.tpgi.com.au...
Quote:
Hi, having dramas with the thermostat on our wall furnace heater, as it
doesn't cutoff after reaching the preset temp. It is a non-electronic
controlled model that just uses the knob for heat control. I've put the
meter across the terminals of the thermostat and get no continuity when it
is cold. I thought that I would get this reading when the unit was hot?
Hoping for any ideas or help, thanks.

Regards,
Xygt



John Leister
Guest

Tue Jun 07, 2005 9:23 am   



pedro wrote:

Quote:
John Leister wrote:

After doing a clean install on my very stubborn PC which
decided to have a fit and crash mid process I found a
very annoying bug....

I have an SIS 305 display card and every time the
computer restarted it kept asking to find my display
adapter.

However having said that I solved the problem by disabling
the second adapter which was in the system properties. If
I had not done so Windows would keep on bloody asking if
I want to instal drivers.

The question is why is Windows doing this every time
the machine reboots?

To this all I can say is that one slight possibility
is my motherboard having a built in AGP video card
which I am not using as I can't find the drivers for
it and am not 100% sure if, or how a built in video
card would work in Windows as far as speed and program
compatibility goes, especially for games.

TIA for any help or comment if anyone can help out here.

John

Assuming that you have not changed any hardware.. go to settings
control panel> systems> device manager, and then delete any entries
under 'display adapters'. Then restart windoze, and it should find your
video card, and install the drivers. (It will ask you for the driver
disk). After this, windoze should not ask again. This is for win98 btw.
Don't know about later versions.

rgds,

Pete.
-----



Thanks Pedro

But I already have my display card and drivers up and running
and in good order. The problem was that AFTER I had installed
that stuff Windoze kept trying to find a display card...

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