10
DIAL CALIBRATION TRIMMER (C5)
This one-time internal adjustment is made with a miniature screwdriver in order to assure
that the frequency markings on the front panel are as accurate as reasonably possible.
EARPHONE JACKS (J2,J3)
These two jacks accept 1/8'' (3.5 mm.) stereo plugs as used in "Walkman'' type
headphones or mini-speaker systems. The audio output is monaural; the two jacks are
wired in parallel to permit the use of two headphones.
Note:
If a mono 1/8'' plug is used for any reason, it must NOT be pushed all the way in,
or it will short out the audio.
ANTENNA CONNECTOR (J1)
This binding post permits easy hookup of any wire, or a banana plug may be inserted in
its end. 10 to 20 feet of ordinary hookup wire (also called "bell wire'') provides good
basic reception, even when installed indoors. See the section on Antennas in this book
for more information.
GROUND CONNECTION
For casual operation, a ground connection is optional. However, a wire from this
connector to a ground rod or cold water pipe will reduce unwanted noise and interference
from nearby electrical devices or AC wiring and may boost receiver sensitivity. Attach
the wire between the two washers, then tighten the wing nut.