QRP Club
QRP Station => Builder's Corner => Topic started by: vu2nan on December 26, 2015, 13:14:52 UTC
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May be viewed at
http://nandustips.blogspot.in/2015/12/uhf-crystal-radio.html (http://nandustips.blogspot.in/2015/12/uhf-crystal-radio.html)
73,
Nandu.
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Very ingenious Nandu!!!
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Thanks, OM Dave!
73,
Nandu.
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There's been an update.
http://nandustips.blogspot.in/2015/12/uhf-crystal-radio.html (http://nandustips.blogspot.in/2015/12/uhf-crystal-radio.html)
73,
Nandu.
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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.
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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.
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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.