What kind of radio was the AR-812?
The AR-812 was a “portable” 6-tube (UV-199) reflex, superheterodyne. As with the Radiola 25, the components – less tubes, were “potted” in wax making repair very difficult. There were lead rivets holding the lid on, that had been punched with “RCA” .
When was the first superheterodyne made by RCA?
RCA Radiola Super-Heterodyne AR-812 Edwin H. Armstrong and Harry Houck were the main engineers to bring forth the first RCA superhet in March, 1924. It was an ingenious model of the superhet that operated on the second harmonic principle.
What was the catacomb on the RCA AR-812?
The front center panel of the AR-812 folds down to reveal the six-tube catacomb. Most of the electronics for the radio, including the IF transformers, were sealed in wax inside the catacomb. The catacomb sealed out moisture and protected the various components, but it also kept prying eyes out! This was state-of-the-art technology in 1924!
What was the problem with the Houck AR-812?
Houck solved the problem by using the second harmonic of the oscillator to mix with the received signal. The front center panel of the AR-812 folds down to reveal the six-tube catacomb. Most of the electronics for the radio, including the IF transformers, were sealed in wax inside the catacomb.
RCA Radiola Super-Heterodyne AR-812 Edwin H. Armstrong and Harry Houck were the main engineers to bring forth the first RCA superhet in March, 1924. It was an ingenious model of the superhet that operated on the second harmonic principle.
The front center panel of the AR-812 folds down to reveal the six-tube catacomb. Most of the electronics for the radio, including the IF transformers, were sealed in wax inside the catacomb. The catacomb sealed out moisture and protected the various components, but it also kept prying eyes out! This was state-of-the-art technology in 1924!
Houck solved the problem by using the second harmonic of the oscillator to mix with the received signal. The front center panel of the AR-812 folds down to reveal the six-tube catacomb. Most of the electronics for the radio, including the IF transformers, were sealed in wax inside the catacomb.
How does the RCA reflexed second harmonic superhet work?
The basic operation of the RCA reflexed second harmonic superhet is as follows (refer to the simplified diagram): The signal is tuned in with the loop and its associated tuning capacitor (this cap constitutes the main tuning control on the left front panel).
