In article <762f0bb3.0311241947.2b82687b@posting.google.com>,
soon93@time.net.my (sooncf) wrote:

Firstly, never post the same message to multiple newsgroups, cross post
it instead.  I have cross-posted it to the groups I know you have used.
(Multiposting fragments the replies and annoys people who reply in
one place then find that the other copy has many versions of their
point already made, or just waste time skipping the duplicate.  Google
is not a proper newsreader, so you will not see the duplicates suppressed
as you would in a proper reader.)

I live in a remote place (inside jungle) some where in south east asia.
So I don't need to apply license from the government.

I think you do.  I happened to look at the Malaysian amateur radio
regulations and they are stricter than the UK ones, e.g. you have to
sign something akin to the UK's Official Secrets Act just to receive off
normal broadcast frequencies (the UK doesn't allow you to listen to
transmissions not intended for you but doesn't require a formal document
to say that you won't and that you will keep what you accidentally detect
a secret, even thought that is what the law is).

The government will not like your breaking various UN conventions[1] on
such transmissions to space as well as breaking ITU radio regulations.

(no way for the government to detect my signal).

I'm not sure how you are going to explain the birds (and aircraft) dropping
out of the sky when they cross your beam, or the intereference caused by
sidelobes and tramsitter spurious emissions.  Arecibo is a no fly zone
when transmitting and it can spread the tranmit power over a much wider
initial beam width than you can.

Currently I own a dish size 3 meter.
Is it enough for this purpose, or do I
need a bigger dish?

The bigger the better.  To be detectable from a 3 metre dish by
Arecibo sized dishes from local stars, you will need a feed point
power of about 1MW.  I hope you afford the electicity bills and the
continual replacement of transmitter tubes.  Also, I'm not sure what
125kW per square metre will do to the dish surface.  (1MW is based on
the reciprocal configuration to the more sensible small dish receiving,
large dish sending, configuration.)  I'd be surprised if you didn't
need proper end user certificates just to get the transmit tubes out
of the USA, so I hope you have a local source.

And what frequency is the best?

That is one of the great questions of small budget SETI.

Much more sensible would be to operate the dish in receive mode as 
part of project Argus, although, given what I've seen of the 
Malaysian radio regulations, I would strongly advise getting a
licence first.

Active SETI is not a realistic amateur project; it is not even one
that many professionals want to be involved with.  As well as being
controversial, it is expensive.

[1] the UN concern is about someone purporting to represent the earth
but only actually representing one faction; other countries, religions,
etc. would object to that.  Some people are also concerned about 
drawing attention to ourselves and provoking a pre-emptive, planet
killing, attack, although I don't subscribe to that theory.