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UHF Crystal Radio
- Thread starter vu2nan
- Start date
Here's an update.
................Later on, another Yagi Beam was rigged up with a second OA85 providing the return path for the audio instead of the coil.
UHF Yagi Beam Crystal Radio
with 2 diodes - Schematic
Signal strength was as good on that one too.
Two UHF Yagi Beam Crystal Radios
73,
Nandu.
................Later on, another Yagi Beam was rigged up with a second OA85 providing the return path for the audio instead of the coil.
UHF Yagi Beam Crystal Radio
with 2 diodes - Schematic
Signal strength was as good on that one too.
Two UHF Yagi Beam Crystal Radios
73,
Nandu.
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.
http://nandustips.blogspot.in/2015/12/uhf-crystal-radio.html
73,
Nandu
A folded dipole version, mounted on a terminal block.
It obviates the need for a coil / additional diode and works quite well too.
http://nandustips.blogspot.in/2015/12/uhf-crystal-radio.html
73,
Nandu
Last edited:
Yet another update!
The terminal block arrangement made it convenient to replace the folded dipole with a full wave loop.
UHF Full Wave Loop Crystal Radio
Likewise with an AWX antenna.
UHF AWX Antenna Crystal Radio
Results were as good as with the folded dipole.
73,
Nandu.
The terminal block arrangement made it convenient to replace the folded dipole with a full wave loop.
UHF Full Wave Loop Crystal Radio
Likewise with an AWX antenna.
UHF AWX Antenna Crystal Radio
Results were as good as with the folded dipole.
73,
Nandu.
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.
Single-diode UHF Yagi Beam
Crystal Radio - Schematic
The diode and capacitor were hence discarded. Performance of this single-diode UHF crystal radio is quite good.
73,
Nandu.
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.
Single-diode UHF Yagi Beam
Crystal Radio - Schematic
The diode and capacitor were hence discarded. Performance of this single-diode UHF crystal radio is quite good.
73,
Nandu.