UHF Crystal Radio

[vu2nan]

May be viewed at

http://nandustips.blogspot.in/2015/12/uhf-crystal-radio.html

73,

Nandu.

[GM0LVI]

Very ingenious Nandu!!!

[vu2nan]

Thanks, OM Dave!

73,

Nandu.

[vu2nan]

There's been an update.

http://nandustips.blogspot.in/2015/12/uhf-crystal-radio.html

73,

Nandu.

[vu2nan]

Another update.

A folded dipole version, mounted on a terminal block.

It obviates the need for a coil / additional diode and works quite well too.

Regards,

Nandu.

[vu2nan]

Yet another!

The terminal block arrangement made it convenient to replace the folded dipole with a full wave loop.

Likewise with an AWX antenna.

Results were as good as with the folded dipole.

73,

Nandu.

[vu2nan]

The latest update!

A second Yagi Beam was then rigged up, with another diode providing the return path for the audio, instead of the coil.

The signal strength was not as good. During trials, a chance shorting of the second diode gave a considerable increase in signal strength.

The diode and capacitor were hence discarded. Performance of this single-diode UHF crystal radio is quite good.

73,

Nandu.