switcher wrote:
pour les Ondes maoyennes, et /ou les Ondes courtes, peut ce genre
d'ampli suffir ??

http://www.selectronic.fr/article.as...r=70.0382-9999

Can this ampli for AM/ SW signals work well ??

http://www.selectronic.fr/article.as...r=70.0382-9999


There are others too :

http://www.selectronic.fr/article.as...r=70.5552-9999

http://www.selectronic.fr/article.as...ier=70.6122-19

which one would be best ??

Are there other ready built boxes on the market (in Europe ?)

Thanks,
Marc

Acactly what frequencies are you trying to amplify and perhaps more
importantly,
why are you amplifing them?

For LF/MW/HF, unless you are using a loop or a short active antenna,
which
will already have an amp, further amplification will almost alway lead
to
overlaod and other unpleasentness.
At least we need to know:
what type receiver(s) you have.
what type antenna are you planning on using.
what frequencles are of interest.

It is very hard to get a single amp to cover the LF (100KHz) ~ upper
HF(30MHz).
When you try to go higher, small simple general purpose amps simply
suck.
6Meter amps are very different from 10Meter/28MH. FM, 88~108MHz over
here
in the USA are a whole different beast. While it is simple tp design
and build a
wide bandwidth amplifier, they all tend to fold when exposed to the
wide range
of signals delivered by an antenna.

Terry