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This is my first one tube shortwave radio. This
is a "regen" type radio using one 1T4 tube. The radio tunes the
49 meter shortwave broadcast band. It tunes from about 5.8 to 6.4
mhz. I wanted to tune a larger range, but since I didn't have a
vernier system nor room for a bandspread capacitor, I decided to
use a narrow tuning range. I have some hand capacitance problems
also. That is, the radio changes frequency slightly when I put
my hand near the tuning dial. Looks like it is time to get out
some shielding.
The front panel is made from a piece of 1/8 inch garolite. Garolite
can be cut on a table saw, but sometimes the edges tend to chip,
so a fine tooth blade would probably work better.
The base of the radio is a piece of stained 3/4 inch oak. This makes
the radio look nicer on the inside. Using wood screws I mounted
the components to the board. I then wired according to the diagram.
The batteries consist of one D battery for the filament and five 9 volt
batteries wired in series. Not shown in the diagram is a DPST switch
to act as a power switch. I understand the batteries, especially the
9 volters last a long time. If you want to run the set on AC, at least
the B+ part, my thought is to get three - 12 volt dc wall wart power supplies
and connect them in series. With the light load of the radio, the
voltage should be somewhere near 45 volts. Let me know if you build
one of these sets.
73, Dave - N2DS
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