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TM 9-2320-356-BD
When the resistors are hooked in parallel, the resistance is reduced by the number
of equal-value resistors in parallel.
If unequal resistors are used, the following formula must be used to compute the
resistance for best operation:
Total Resistance (R
1/R = 1/1800 + 1/1500 + 1/2300
R = 604 ohms
2300 OHMS
15-8.
VERTICAL DIPOLE ANTENNA SUBSTITUTE
General Information:
A vertical dipole will provide transmission capability while mobile. The length of
the transmitting antenna must be carefully selected because a matching unit will
not be used.
For quick reference, wire lengths for the following frequencies are
given for each leg of the completed antenna:
30.00 MHz (MC) = 7 ft 9 in.,
b.
40.00 MHz (MC) = 5 ft 8 in.,
c.
50.00 MHz (MC) = 5 ft 0 in.,
d.
60.00 MHz (MC) = 3 ft 11 in., and
e.
70.00 MHz (MC) = 3 ft 4 in.
For best performance, the exact wire length for the frequency to be used can be
calculated using this formula:
length (feet) = 234 divided by the frequency in MHz
(MC).
Limitations:
o Possible reduced range
o Must build a new antenna for every 10.00 MHz frequency change
15-7
a.
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