Bandswitch Board:
Notice the unused circuit board positions for C35 through C42. We provided
these in our original design in anticipation of a possible need to put a small
capacitance in parallel with an inductor for a desired frequency coverage.
Adding any such a capacitor LOWERS the frequency range and reduces the
total tuning range of R20.
For the convenience of all kit builders, the bandswitch board is manufactured
as a double-sided board with plated-through holes.
Attention Club Leaders, Instructors:
The T-KIT Model 1054 Receiver Kit
is an economical and simplified version
of this same 1253 receiver
with mechanical pushbutton switching of
4 bands between 5 and 15 MHz.
The audio IC is LM386; good stability is achieved by using
separate batteries for the detector/varactor circuits and the audio
circuit. We provide a good-looking front panel, and the kit builder
supplies knobs, cabinet, speaker, wire and other hardware items.
1253 - 62
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