"Jan Panteltje" wrote...

There is actually an other way to reduce noise in the transmister-
receiver chain.
This is to use an expander in the transmitter, and a compander in the receiver.


"Jan Panteltje" then wrote...

Should of course be: compander in transmitter, expander in receiver.
You reduce dynamic range so it matches that of the radio channel.

I was just about to correct that one.

A better system involves splitting the high and low frequencies first. As the unwanted noise
is at the high frequency end, only high frequencies are compressed and expanded. You can split
into more bands, but I think the OP wants simple starter ideas.

One could use a Philips NE570 chip (if you could still find one)

Got one sat here in stock.


As all this requires electronics, and may pose problms for some, but you can
do it with a PC an Linux too, using the sox program:

One could also use pre-emphasis and de-emphasis, which is very simple. Maybe
the OP should start with the ANL and, if he is game for more, go on to try some of
the other ideas.


There is a small delay... but you can use it in the transmit side too, add echo and other
effects etc..


What is it What with is what CB is it and with it echo with CB and echo CB and echo CB and echo
and echo echo?


Regards,

Peter.
http://www.citizensband.radiouk.com/