Frequency Vs. Wave Length - Bell OH-58A Technical Manual

TM 55-1520-228-BD
ELECTRICAL AND AVIONICS SYSTEM
Frequency Wavelength
Figure 11-45. Frequency vs. Wave Length
TO CHANGE
Centimeters . . Inches. . . . . . 0.394
Meters. . . . . Feet. . . . . . . 3.280
11-46
69.95 MHZ.
column for 50 MHZ on the wave length
side of the Table, 6 M is shown.
feet.
= 19.68 feet for one wave length.
1/8 wave length antenna, 19.68 = 2.46
feet.
a .95 correction factor:
.95 = 2.34 feet.
of the radiating element.
2. Cut the coax cable to the length of
the required radiating element. Remove
the outer insulation and shield from the
piece of coax cable and then strip a 1
inch piece of insulation from each end
exposing the center conductor, Figure
11-46A.
3. Wrap and solder the 52
one end of the radiating element as per
Figure 11-46B.
cation of the radiating element of the
antenna.
4.
the right-hand side just forward of the
tail boom, Figure 11-47, by removing
twenty-seven screws.
5.
locate coax cable marked 1 ARC 114-101B
and disconnect it.
nector and prepare a 4 inch pigtail ter-
mination on the end of the coax cable as
shown in Figure 11-46C.
6.
antenna from step three with the resis-
tor end down into the drain hole in the
bottom of the tail boom where it joins the
MULTIPLY BY
fuselage, Figure 11-47.
FM radio with frequency range of 30 to
Center of frequency range is 50 MHZ.
Using Figure 11-45, look under frequency
Use Figure 11-45 to convert meters to
Six meters multiplied by 3.280
Divide the one wave length by 8, for a
Multiply the 1/8 wave length by
This is the length
This completes the fabri-
Next, remove the structural panel on
At the tail boom quick disconnect,
Stick the radiating element of the
2.46 ft. X
resistor to
Remove the coax con-