ANTENNAS
(a) Single Wire Antenna
The single wire or inverted "L" type of antenna will provide satisfactory performance over the
entire tuning range. Simply connect one end of the antenna wire to center pin of a PL-259 Con-
nector and attach to Antenna Jack. For good reception the antenna wire should he 30 to 100 feet
long and placed as high as possible (see Fig. 1-5-1). Generally, this type of antenna provides
maximum pick-up at right angles to its entire length. This should be borne in mind when install-
ing the antenna. In some locations, reception may be improved by connecting a ground wire
from the GND terminal to a cold water-pipe or outside ground rod. For protection against light-
ning, a lightning arrestor should be included in any outdoor antenna system.
(b) Doublet Antenna
A doublet antenna will give excellent results, especially on amateur bands. A 75 ohms balanced
transmission line should be used (as shown in Fig. 1-5-2). Since the doublet antenna provides
optimum performance only at a given frequency, it should be cut to the length for the most often
used band of frequencies. The overall length of a doublet antenna can be determined by using the
following formula:
L (Length in feet) = 468
Frequency MHz
Since the doublet antenna displays directional properties broadside to its length, it should be ori-
ented in such a manner that maximum signal pickup can be realized.
(c) Other Antenna Systems
More elaborate antenna systems may be installed to provide better performance. Information on
a number of different types can be obtained by referring to the Radio Amateur’s Handbook or the
A.R.R.L. Antenna Book, both published by the American Radio Relay League, West Hartford,
Conn.
FIGURE 1-5 TYPICAL ANTENNA INSTALLATION
-7-
Summary of Contents for SX-190
Page 1: ......
Page 7: ...FIGURE 1 3 ATTACHING CABLE TO PHONE PLUG CONNECTOR FIGURE 1 4 INSTALLATION OF GROUND 6 ...
Page 17: ... 16 ...
Page 22: ...SCHEMATIC DIAGRAM OF RF AMP 21 ...
Page 23: ...SCHEMATIC DIAGRAM OF BUFFER AMP SCHEMATIC DIAGRAM OF CALIBRATOR 22 ...
Page 24: ...SCHEMATIC DIAGRAM OF VFO SECTION 23 ...
Page 25: ...SCHEMATIC DIAGRAM OF I F AMP SECTION 24 ...
Page 26: ...SCHEMATIC DIAGRAM OF POWER SUPPLY 25 ...
Page 29: ......
Page 30: ......
Page 31: ......