But I miss something. Maybe something with differences between
transmitting
and receiving with a ferrite antenna. The antenna is not pure
reciprocal -
because the ferrite (or iron powder) can be nonlinear!


Yes, a ferrite stick antenna works quite well for receivers, but not for
transmitters. Try winding a few dozen turns around the whole room - i.e.,
up the wall, across the ceiling, down the other wall, across the floor,
and so on. Or, you could wrap a piece of 50-conductor ribbon cable, and
make loops by soldering the ends together offset by 1. ;-)

You made my day
BTW: Your idea with the ribbon cable gives you a very easy made
transformator if using clamping connectors. This works very good. I
practiced it 10 years ago.

I heart it several times that a ferrite stick antenna cannot work as a
useful transmitter antenna. But why?????


I don't know very much about antenna theory, but I know that the bigger
the better. ;-)
Sure, for reasonable antennas. But if the antenna is very VERY big in
relation to wavelength it even cannot work! Read somewhere.


Something's telling me that it's theoretically possible to transmit with
a ferrite stick, but from the kind of power you'd have to run through it,
it would probably blow up. =:-O
I found no saturation state but I have not enough power at the moment to
drive it very powerful. Something I try later ...

Regards -
Henry