PRC as a amplifier in GPS question.

[Mylinux]

Jack <szachownica2002@yahoo.com.au> wrote in message
news:3F8163E3.2739685C@yahoo.com.au...

the antenna you are asking for is built of helical antenna and dish.
for dish antenna go there
http://images.google.pl/images?hl=en&lr=&ie=ISO-8859-1&q=dish+antenna

for helical as before

you can visit eBay on-line auction site

if you are looking for a name of a manufacturer
go back to that place, city and just ask for or call the owner.
If the phone number is not avaliable, call local computer shops, ISPs.

Mayby your antenna was made by local workshop.

Search for grid dish antenna too.

http://images.google.pl/images?hl=en&lr=&ie=ISO-8859-1&q=grid+dish+antenna

it looks more like a grid antenna. But at the present moment, Iam try to
solve the NT 3881 LCD.( big trouble).

Jack

Mylinux wrote:

all 6 pages are read.

none of them belongs to the one that I took the digital pic.

Jack <szachownica2002@yahoo.com.au> wrote in message
news:3F8150DF.64B84484@yahoo.com.au...
helical grid dish antenna

http://images.google.pl/images?hl=en&lr=&ie=ISO-8859-1&q=helical+antenna+

Jack

Dr LG wrote:

Like one of those wifi antennas for 2.4ghz only its round.. Point
link
for
something. Very direction and a little more stylish then most.
Could be a tx or rx link for vid/audio, data link, pay tv antenna,
an rx
antenna for monitoring a 1.8 or 2.4ghz or such cordless phone, ummm
can't
think of any more atm.

"Mylinux" <myLinux@My.com> wrote in message
news:blp166$2gq12@imsp212.netvigator.com...
please!

I may be a little cross -posting I need more people to teach me
about
antenna.

 

[Jeff]

This is usually called by its commercial name of a "Gridpack" antenna.
Check out Andrew Corp or RFS for examples

As gridpacks are 'piped' reflectors they only successfully scatter linearly
polarized waves. Which means that it has a linearly polarized feed.

In my experience the feed is usually some kind of 'Huygens source' meaning
that equal electric and magnetic field strength components are radiated in
any one direction. In practice this usually means that under the 'Can' is
metallic and there is a electric dipole with perhaps a slot arrangment
driving the Can cavity. The aperture loop of this cavity then acts as a
magnetic dipole.

However this dish looks small? or the feed is large compared to its
supporting pipe/coax (ie not heliax) so the Can may just be a plastic
weather housing and some dinky pyramidal or dipole inside... hard to say
without a closer look. In any case satcomms with this dish are out due to
polarization. So it'd be some kind of point to point link. Ie. whatever
microwave point to point comms you like.

Jim

"Mylinux" <myLinux@My.com> wrote in message
news:blp166$2gq12@imsp212.netvigator.com...

please!

I may be a little cross -posting I need more people to teach me about
antenna.

 

[Peter Lowrie]

Hey Wazo, what year are you in?



Wazo@that.bug.you.on.net.com wrote:

To all webmaster,newsmaster

To fight Copyright and illegal usagers of Newsgroups
it's recommand to set all you News server to receive and send
only 32 kbytes of article for all newsgroups (250 lines)

Newsgrousp was use for Text , chit chat , permit to post more
of 32 kbytes of article it's flood internet all around the world
and groups team piracy have use usenet for long time

Fight Piracy set your News Server to 32 kbytes (250 lines)



Thanks

Fight Piracy Team !

 

[Eric]

"Nigel" <Nigel@nospam.com> wrote in message
news:FIrhb.58$ws.4269@news02.tsnz.net...
Electric shock hazard

see http://www.nzscanners.org.nz/displayarticle117.html for details

 

[HH]

Group,
I built the device using the LM7824, 7818 & 7812 in series, and it worked,
the heat output is very low, I can actually rest my finger on each of the
IC's and they feel just warm.
Many thanks for all of your input.
John
"budgie" <budgie@nowhere.cantech.net.au> wrote in message
news:3f7c03ba.2037416@news.cantech.net.au...

On Thu, 02 Oct 2003 10:13:46 GMT, "HH" <hh@hotmail.com> wrote:

Hello John,
I have the whole thing enclosed in a jiffy box, and the heat build up
causes (I think) the 7812 to shut down, I have heat sinked the 7812 and
put
a tiny fan on the jiffy box, and its OK, but I am trying to keep the cost
and production time down. The heat is such that I cannot put my finger on
the heatsink.
It has just occurred to me, what if I used a 7824, a 7818 and finally a
7812
in series? Would this decrease the heat?

Nope. The heat dissipated is STILL (Vin-Vout)*Ipass. You have broken
it into several pieces, but it still adds up the same.

That's not to say that each device in such a chain won't stay in its
SOA in such a scheme, but the total heat dissipated within the box
will remain the same.

As before, the only ways I can see to reduce heat dissipation in the
box are:

(a) reduce Vin (i.e. a lower voltage plugpack); or
(b) go switchmode.

If the cited switchmode drop-in TO220 doesa the job, then eietehr of
these is better - and probably cheaper - than reconfiguring for
multiple linear regs.

 

[Stephen]

What would you expect from a dodgy el cheapo brand.


"Eric" <some1@clare.co.nz> wrote in message news:3f88390e$1@clear.net.nz...

"Nigel" <Nigel@nospam.com> wrote in message
news:FIrhb.58$ws.4269@news02.tsnz.net...
Electric shock hazard

see http://www.nzscanners.org.nz/displayarticle117.html for details

 

[Ken Taylor]

"Stephen" <sxxxx@dodo.com.au> wrote in message
news:bmb3kn$gs7ud$1@ID-194817.news.uni-berlin.de...

What would you expect from a dodgy el cheapo brand.


"Eric" <some1@clare.co.nz> wrote in message
news:3f88390e$1@clear.net.nz...
"Nigel" <Nigel@nospam.com> wrote in message
news:FIrhb.58$ws.4269@news02.tsnz.net...
Electric shock hazard

see http://www.nzscanners.org.nz/displayarticle117.html for details

Nice to see they check these things *before* endangering customers......

 

[Rod Speed]

fruitbat <fruitbat@gmx.net> wrote in message
news:3f8a1b13$0$23592$5a62ac22@freenews.iinet.net.au...

My computer room has bright fluorescent overhead lights.
I like the brightness for reading.

Are there dimmer switches available that would allow
me to turn down the brightness when I am on the PC?

(Yes, I know that this is not quite the right group for the question,

aus.electronics is much better, I've added it to the newsgroup list.

but there are a lot of bright people out there.)

Dont you want dimmer people ?

And everyone knows that you bloody fruitbats dont like bright lights.

 

[The real Andy]

"Ken Taylor" <ken123@xtra.co.nz> wrote in message
news:Isiib.176385$JA5.4424785@news.xtra.co.nz...

"Stephen" <sxxxx@dodo.com.au> wrote in message
news:bmb3kn$gs7ud$1@ID-194817.news.uni-berlin.de...
What would you expect from a dodgy el cheapo brand.


"Eric" <some1@clare.co.nz> wrote in message
news:3f88390e$1@clear.net.nz...
"Nigel" <Nigel@nospam.com> wrote in message
news:FIrhb.58$ws.4269@news02.tsnz.net...
Electric shock hazard

see http://www.nzscanners.org.nz/displayarticle117.html for details

Nice to see they check these things *before* endangering customers......

I would probably blame marketing or management. A slight oversight in order
to get the product out the door 6 months before its ready.

 

[Ken Taylor]

"The real Andy" <ihatehifitrolls@yahoo.com.au> wrote in message
news:3f8a8463$0$28119$afc38c87@news.optusnet.com.au...

"Ken Taylor" <ken123@xtra.co.nz> wrote in message
news:Isiib.176385$JA5.4424785@news.xtra.co.nz...
"Stephen" <sxxxx@dodo.com.au> wrote in message
news:bmb3kn$gs7ud$1@ID-194817.news.uni-berlin.de...
What would you expect from a dodgy el cheapo brand.


"Eric" <some1@clare.co.nz> wrote in message
news:3f88390e$1@clear.net.nz...
"Nigel" <Nigel@nospam.com> wrote in message
news:FIrhb.58$ws.4269@news02.tsnz.net...
Electric shock hazard

see http://www.nzscanners.org.nz/displayarticle117.html for
details

Nice to see they check these things *before* endangering customers......

I would probably blame marketing or management. A slight oversight in
order
to get the product out the door 6 months before its ready.

That's a marketing definition of 'slight'!

Ken

 

[Dennis Antal]

About then i think.

"Peter Lowrie" <peterlowrie@consultant.com> wrote in message
news:Hmphb.39$ws.2513@news02.tsnz.net...

Hey Wazo, what year are you in?



Wazo@that.bug.you.on.net.com wrote:

To all webmaster,newsmaster

To fight Copyright and illegal usagers of Newsgroups
it's recommand to set all you News server to receive and send
only 32 kbytes of article for all newsgroups (250 lines)

Newsgrousp was use for Text , chit chat , permit to post more
of 32 kbytes of article it's flood internet all around the world
and groups team piracy have use usenet for long time

Fight Piracy set your News Server to 32 kbytes (250 lines)



Thanks

Fight Piracy Team !

 

[James]

I've used the wrong footprint for a SOT-23 NMOS logic fet

As a result I need to find a transistor that has the following pin structure:

[Source]

[Gate] [Drain]

All FETs that I have come across have have this layout:

[Drain]

[Source] [Gate]


I have looked into using BJTs but still have the same problem.

Ie all BJTs have this structure:

[Collector]
[base] [emmiter]


What i need:

[emmiter]

[base] [collector]


If anyone can tell me of a switch from rs or farnell that has this marking i'd
really appreciate it.

Been searching for ages and can't find one.

 

[James]

All FETs that I have come across have have this layout:

[Drain]

[Source] [Gate]

That should have been:

[D]

[G]

 

[KoRRupT]

"James" <s362741@student.uq.edu.au> wrote in message
news:bmtnjt$dtv$1@bunyip.cc.uq.edu.au...

I've used the wrong footprint for a SOT-23 NMOS logic fet
...
Been searching for ages and can't find one.

i did that a few years ago... it was an expensive education : )

I ended up doing a redesign... but used a TO-92 package (a bit dodgy) to
continue with the prototyping.

good luck... let us know if you find anything - could be useful one day.

 

[The real Andy]

"KoRRupT" <me@nowhere> wrote in message
news:3f935241$1@duster.adelaide.on.net...

"James" <s362741@student.uq.edu.au> wrote in message
news:bmtnjt$dtv$1@bunyip.cc.uq.edu.au...
I've used the wrong footprint for a SOT-23 NMOS logic fet
...
Been searching for ages and can't find one.

i did that a few years ago... it was an expensive education : )

I ended up doing a redesign... but used a TO-92 package (a bit dodgy) to
continue with the prototyping.

good luck... let us know if you find anything - could be useful one day.

I think that you will find that the way the die is manufactured will make it
virtually impossible to find what you are after.

 

[Ronie]

wankers crap


"Anonymous" <Nobody> wrote in message news:28100300.5135@none444.yet...
: Gee - I've been looking round the web and its amazing what you can get for
free which other people pay money for!
:
: have a look at this link but dont give the link out -
http://www.geocities.com/thomasharry2000/
:
:
:
:
:
:
: ----== Posted via Newsfeed.Com - Unlimited-Uncensored-Secure Usenet
News==----
: http://www.newsfeed.com The #1 Newsgroup Service in the World! >100,000
Newsgroups
: ---= 19 East/West-Coast Specialized Servers - Total Privacy via Encryption
=---

 

[Ronie]

Two Aerials meet on a roof - fall in love - get married. The ceremony
was rubbish but the Reception was Brilliant.

 

[Mainlander]

In article <bp6je4$4a3$1@lust.ihug.co.nz>, rich@ihug.co.nz says...

Probably needs a good heavy duty battery. I wonder how hard these things
are on car battery if the car isn't running at the time?

I was gettnig about an hour out of it before the low battery cutout kicked in,
Still plenty left in the battery to start the car. That was with 1 laptop

Thats on a car battery smaller then any I have seen before. I think one laptop
is about 60-70 watts.

Cheap inverters put out square wave voltage/current. As there is a
significant DC component in the waveform, gear that expects a varying
voltage will not work so well with it. Thus you may not be able to draw
the full rated load if your equipment contains, say, a simple power
supply with a 50 Hz mains transformer, since the DC will not pass through
the transformer, only the very small part of the waveform where it goes
instantaneously from +230 to 0 (or is that +115 to -115) will be passed.
Thus the power that can be drawn off will be less than the usual
V*I*power factor bit that would be expected.

Can't remember what the other limitation of a square wave output are - I
think it has something to do with the peak being at 230 V instead of 325V
as is the case with a sine wave - or the RMS voltage or something.

I was at a place where a guy ran an audio amplifier off an inverter, the
amp would have had an ordinary 230V 50Hz mains transformer, rectifier and
caps in the power supply. The thing actually hummed quite a lot - only to
be expected as the power supply caps would have insufficient capacity to
smooth out a much rougher DC waveform that the transformer would supply.

That said, most computers these days use a switchmode supply that
converts the incoming AC to DC then back to high frequency AC, passing HF
transformer and out to the various voltages. I wouldn't expect these to
be affected to the same extent by this problem.

 

[Mainlander]

In article <3FB7432F.4020502@deletethis.actrix.co.nz>,
rnickel@deletethis.actrix.co.nz says...

T.N.O. wrote:
Phillip Weston wrote:

You could also just turn the inverter off when you wish too.


well it will only be used when Im out driving, searching for ummm,
networks, and the car will be left running.

Check the Jaycar catalogue at jaycar.co.nz , they have several listed
and their stuff is generally a cut above DSE.

No, most of the jaycar stuff is "modified sine wave", not suitable for
driving AC motors or mains transformer gear. Only a few of their
inverters produce pure sine wave outputs suitable for any equipment.

Having said that a computer switchmode supply should work fine off even a
cheap inverter with a square wave output.

Jaycar also make a DC-DC switchmode power adapter for laptops, not
terribly cheap as essentially it is an inverter that produces DC outputs
instead of 230V AC.

 

[Mainlander]

In article <PoAxb.12276$VV6.272285@news.xtra.co.nz>,
~misfit~@his_desk.com says...

Mainlander wrote:
In article <Punxb.11612$VV6.258875@news.xtra.co.nz>,
~misfit~@his_desk.com says...
I have a mobo here that has bad caps. Of the 25 or so large ones ten
are domed or bulging. The PC spontaneously re-boots after 30 seconds
or so. (Tried with three different PSUs).

I haven't attempted doing anything like replacing caps on a mobo
before, I may be capable of it but would hate to risk the board. I'm
in South Auckland, does anyone know of an outfit or person who could
provide this service and any idea what it would cost? Or should I
just attempt it myself? (And where would be the best place for a
novice to get the caps at the right price?)

The boards have multiple layer traces, working on one of these would
be quite a specialised task. I doubt any home hobbyist would have the
gear to do it.

I realise it isn't just like soldering two wires together. I have a
fine-tipped, low-wattage soldering iron and a mate who has a solder-sucker
that I can borrow (He has quite a well equiped soldering-station actually,
he used to design and build his own PCBs, I might have to attempt it at his
place or get him to do it). I'm still waiting to hear back from 'The Flash'
on his offer of looking at it for me.

I'd take note of what Alan said in his post about repairing these things.
If you damage the internal traces there's no way of repairing them, so
you'd want to be pretty sure what you're doing.