want to make a simple class a amp

  • Thread starter Matt2 - Amstereo
  • Start date
On Sun, 02 Jan 2005 15:55:06 +1000, Matt2 - Amstereo <amstereo@ToptusDOTcomDOTau> wrote:
I'm needing 1Mhz because thats the AM broadcast band, and i'm
experimenting with different ways of getting a signal to TX to a usable
distance.
Define "usable distance". What is the distance you want to transmit?
 
"dmm" <dmmilne_REMOVE_@ozemail.com.au> wrote in message
news:hl6st0pc5u173n9uh1k979o6o88gbu8pi1@4ax.com...
On Sun, 02 Jan 2005 15:55:06 +1000, Matt2 - Amstereo
<amstereo@ToptusDOTcomDOTau> wrote:
I'm needing 1Mhz because thats the AM broadcast band, and i'm
experimenting with different ways of getting a signal to TX to a usable
distance.
Define "usable distance". What is the distance you want to transmit?

**** As far as the moron can cover,don't encourage the drongo!

Brian Goldsmith.
 
Go away Brian and stop being a plain old vanilla dick!

There are people with legitimate reasons, this ng is for the exchange of
information, not rules.


"Brian Goldsmith" <brian.goldsmith@nospam.echo1.com.au> wrote in message
news:8N6Dd.106274$K7.15396@news-server.bigpond.net.au...
"Fred Ferd" <fred@ferd.com> wrote

. Also vary your search terms
and use quotes for exact matches, i.e.. "class a amp" "class a amplifier"
make your own, diy etc....

Absolutely not enough for what he wants.


All he wants to do is test AM vs FM. why not use CB bands for this ?


****** Because the moron wants to broadcast in the AM or FM band!!!!!!!Ask
him!!!

Brian Goldsmith
 
"Moore Cones" <32w@asd.com> wrote


There are people with legitimate reasons, this ng is for the exchange of
information, not rules.


***In this case,what legitimate reasons?


Brian Goldsmith.
 
While I agree that the sharing of information is a great thing, it surely has
to be done with due regard to responsibility - bit like the 'responsible
serving of alcohol' thing.

If, for example, a poster wants info on to set up a system to electrocute
intruders, are you suggesting we ignore the 'rules'?

It seems to me that there is/was a good chance that the OP may build and use a
device which could seriousely interfere with other peoples reception of radio
programs - while in this case it is not so much the breaking of the rule that
would bother me, but...

He should not be assisted or encouraged to build and use equipment that
interferes with others rightful enjoyment of radio reception

He needs to know that by using such equipment he is breaking the law and may be
subject to penalties

So, I suggest Moore that you could take a more responsible and mature approach
to these sorts of issues

David

Moore Cones wrote:

Go away Brian and stop being a plain old vanilla dick!

There are people with legitimate reasons, this ng is for the exchange of
information, not rules.
 
"Moore Cones" <32w@asd.com> = top posting pig with a new addy - never
used on usenet before.


Go away Brian and stop being a plain old vanilla dick!

There are people with legitimate reasons,

** But not Matt2 or you Mr Moore Cones ( must be a reference to boom cars).


this ng is for the exchange of information, not rules.

** That is where you are wrong.

NGs and NG posters are not immune from the law of the land for what words or
info appears on the group.

What Matt2 wants to do is a criminal offence with a possible jail term -
by nature the crime is one that publicises itself to the whole area. Only
the most asinine of dickheads even try it. Matt2 is one of them.

Regular posters, particularly those using their real names, do not wish to
be associated with criminal activity or aid and abet such activity which
could be an offence in itself.

That you do tells me you are a nothing short of a criminal.

So fuck off.



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





"Brian Goldsmith" <brian.goldsmith@nospam.echo1.com.au> wrote in message
news:8N6Dd.106274$K7.15396@news-server.bigpond.net.au...

"Fred Ferd" <fred@ferd.com> wrote

. Also vary your search terms
and use quotes for exact matches, i.e.. "class a amp" "class a
amplifier"
make your own, diy etc....

Absolutely not enough for what he wants.


All he wants to do is test AM vs FM. why not use CB bands for this ?


****** Because the moron wants to broadcast in the AM or FM
band!!!!!!!Ask
him!!!

Brian Goldsmith
 
dmm wrote:
On Sun, 02 Jan 2005 15:55:06 +1000, Matt2 - Amstereo <amstereo@ToptusDOTcomDOTau> wrote:

I'm needing 1Mhz because thats the AM broadcast band, and i'm
experimenting with different ways of getting a signal to TX to a usable
distance.


Define "usable distance". What is the distance you want to transmit?

just the local suburb, ~2km radius would do it. i live in a slightly
difficult area, hills etc, i want to see how well am copes
 
On Sat, 08 Jan 2005 12:25:02 +1000, matt2 <amstereo@optusnetdotcomdotau> wrote:

dmm wrote:
On Sun, 02 Jan 2005 15:55:06 +1000, Matt2 - Amstereo <amstereo@ToptusDOTcomDOTau> wrote:

I'm needing 1Mhz because thats the AM broadcast band, and i'm
experimenting with different ways of getting a signal to TX to a usable
distance.


Define "usable distance". What is the distance you want to transmit?

just the local suburb, ~2km radius would do it. i live in a slightly
difficult area, hills etc, i want to see how well am copes
What is the application? Could you explain *exactly* what you want to achieve?
 
"dmm"

What is the application? Could you explain *exactly* what you want to
achieve?
Quotes from earlier thread:


" i'm wanting to transmit a radio signal to about 5KM radius from my
location. i would like to use both the am and fm bands for power -
performance compare. "


" ** I hope this law breaker lives way out in the sticks somewhere. "

" no i don't, im ipswich based "



" "Matt2 - Amstereo" = 14 year old, wannabe radio DJ - plus nut
case "

" ME 23 true not true "

" ** Correction - Matt is a 23 year old, mentally retarded, wannabe
radio DJ.

Probably plead "non compos mentis" in court. "




.............. Phil
 
you need a narrowband tuned rf amp.

a single transistor will do, running class AB but use a good heatsink. you
will need input matching and output matching and filtering into the load
(antenna) which is going to have a complex impedence.

search for amateur radio designs on the www for the "top band" or "160m
band" then modify the component values to suit your lower frequency.

your main problem will be getting the aerial to radiate anything.

Ed
 
What is the application? Could you explain *exactly* what you want to achieve?

im wanting to do a distance / sound quality / stereo stability vs power
and setup types. (will be tx'ing audio)im wanting to learn more about
how the 2 types work, differ and compare.
 
"matt2" <amstereo@optusnetdotcomdotau> wrote in message
news:41e522f2$0$21441$afc38c87@news.optusnet.com.au...
What is the application? Could you explain *exactly* what you want to
achieve?

im wanting to do a distance / sound quality / stereo stability vs power
and setup types. (will be tx'ing audio)im wanting to learn more about how
the 2 types work, differ and compare.
**Then you need to understand several things:

* What you propose is highly illegal. The fines used to be in the order of
$50,000.00. If you attempt such a thing, you deserve every punishment you
will receive.
* Using Class A is an utter waste of time, energy and money. Class A/B will
be fine.
* What you propose to do has already been done, many times and in many
places. Go to your library and do some reading. It will save you time and
money.


--
Trevor Wilson
www.rageaudio.com.au
 
Trevor Wilson wrote:

"matt2" <amstereo@optusnetdotcomdotau> wrote in message
news:41e522f2$0$21441$afc38c87@news.optusnet.com.au...

What is the application? Could you explain *exactly* what you want to
achieve?


im wanting to do a distance / sound quality / stereo stability vs power
and setup types. (will be tx'ing audio)im wanting to learn more about how
the 2 types work, differ and compare.


**Then you need to understand several things:

* What you propose is highly illegal. The fines used to be in the order of
$50,000.00. If you attempt such a thing, you deserve every punishment you
will receive.
* Using Class A is an utter waste of time, energy and money. Class A/B will
be fine.
And class C would be better again for this application.

* What you propose to do has already been done, many times and in many
places. Go to your library and do some reading. It will save you time and
money.
 
Phil Allison wrote:
"swanny"


And class C would be better again for this application.




** Not as a linear for AM ???




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


class A seems to be most linear (major requirement for stereo
broadcasting as any phasing in the signal will screw the stereo signals
location between the 2 channels)can someone draw a basic easy cheap to
build amp circuit+parts? this is what I am after, just a simple class A
or equivilent amplifier? that would be the most help, as much as i look
around on the net, i can't find a simple answer stating what components
to purchase and which way to solder them.

i know class A's are the simplest to build (from what i can gather) i
only want to boost 100mw to 2 watt or there abouts. quite a small gain,
but will allow me to experiment a bit more.
ta.
 
"matt2"
i know class A's are the simplest to build (from what i can gather) i only
want to boost 100mw to 2 watt or there abouts. quite a small gain, but
will allow me to experiment a bit more.
ta.

** This anencephalic, bloody wannabe, DJ prick is like a disease.

I hope he builds his transmitter, gets caught and goes to jail.

There are a bunch of big, hairy dudes in there just salivating to fuck a
23 yo DJ.




................ Phil
 
"matt2" <amstereo@optusnetdotcomdotau> wrote in message
news:41e66c6c$0$24458$afc38c87@news.optusnet.com.au...
Phil Allison wrote:
"swanny"


And class C would be better again for this application.




** Not as a linear for AM ???




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


class A seems to be most linear (major requirement for stereo
broadcasting as any phasing in the signal will screw the stereo signals
location between the 2 channels)can someone draw a basic easy cheap to
build amp circuit+parts? this is what I am after, just a simple class A
or equivilent amplifier? that would be the most help, as much as i look
around on the net, i can't find a simple answer stating what components
to purchase and which way to solder them.

i know class A's are the simplest to build (from what i can gather) i
only want to boost 100mw to 2 watt or there abouts. quite a small gain,
but will allow me to experiment a bit more.
ta.
Go get a copy of the ARRL Handbook, as has been mentioned before. It's all
there.

As a matter of interest, phase modulation is often used for high-power
AM-band broadcast transmitters as there isn't the requirement for the large
amounts of modulating power (1/2 the RF tx output). It's a neat maths
trick - the interested student will go search it out.

Ken
 
"Ken Taylor"

As a matter of interest, phase modulation is often used for high-power
AM-band broadcast transmitters as there isn't the requirement for the
large
amounts of modulating power (1/2 the RF tx output). It's a neat maths
trick - the interested student will go search it out.

** No luck finding it on Google.

Are two identical ( class C) output stages used, with the relative phase
being modulated from 0 to 180 degrees prior to being combined and sent up
the mast ??




................... Phil
 
Here is an FM transmitter that boasts up to 20W.: Quite cheap too.

http://www.pcs-electronics.com/en/products.php?sub=pc_fm_trans
 

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