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Monthly Presentations Archive - A Collection of our favorite member presentations
Aries demos a radio with built in bar.
Reed demos his new design for a low power broadcast transmitter
Ben demos his design for a ‘modified sine wave generator’
Mark demos his digital countdown clock.
Should be fun at an airport security check !
Jim demos the electron ray tube,
also called a tuning eye or cat’s eye tube.
Ben showed us his turn of the century vacume pump…
It sounded like a steam engine !
Mark shows us his broadcast transmitter
he made from Reed’s design
Roger’s original ‘solid state’ radio,
his homebrew crystal set.
Paul Hart gave us a presentation
of how tube testers work.
Mark demonstrates how he created
a glass dial from a much larger piece.
Reed’s presentation of a test fixture to
determine the performance of various
tubes. Here a 1619 is compared to an
antique # 45. Different adapters were
tried to show the effects of bias on
performance.
Jim’s presentation of the first means of
measuring frequency. It represents a
mechanical hetrodyne oscillator.
Reed gave a presentation of a working Radiola III.
He used a small BC transmitter connected to a
CD player to broadcast to this fine antique.
Reed gave us a demo
of a “Tube Rejuvenator”.
We wonder how many
tubes were blown up
by this device ?????
Reed gave us a demonstration of an “aperiodic receiver” that he constructed.
These were essentially untuned radio receivers with lots of audio amplification but not much signal sensitivity. They were used during World War 2 to locate possible enemy transmitters. Only a very few were made. Morse code from a milliwat transmitter could be plainly heard in the receiver
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