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MAINTENANCE
LB131,O72
CAUT
ION
Before bench testing the radio
bench power supply.
be sure of the output voltage characteristlcs of
your
To protect the transmitter
power
output transistors from possible instant destructi-on,
the following input voltages
must
not be
exceeded:
Transrnitter unkeyed: 20 Volts
Transmitter keyed (50
ohm
resistive load):
18
Volts
Transmitter keyed (no load or non-resistive, load):
15.5 Volts
These
voltages are specified at the normal vehicle battery terminals of the radio
and
take the voltage drop of standard cables into account.
The
voltage limits
shown
for
a
non-optimum
load is for "worst case" conditions.
For
antenna mismatches
1ikely to
be
encountered
in practice, the actual limit wiIl
approach
the
18
VoIt figure.
iir
ri
il'
Routine transmitter tests should be
performed
at EIA Standard Test Voltages
(13
for loads of 0 to 6 amperes: Input voltages must not exceed the limits
shown
VDC
even
for transient
peaks
of short duration.
Many
commonly
used bench power supplies cannot meet these requirements for
load
regulation and transient voltage suppression.
Bench supplies which employ "brute
force" regulation and filtering
may
be usable
when
operated in parallel with a 12 Volt
automotive storage battery.
GENEFAL
ELECTRIC COMPANY. MOBILE COMMUNICATIONS DIVISION
WORLo
HEAOOUARTERS.
LYNCHBURG.
VIRGINIA
24502
U.S.A.
r,t
.
'/ui,:
GEN ERA
L@
ELEOTRIC
fradema.k ol General
E
lectric CompanV U.S.A
PrintedinUSA.
13
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