ORDER NO.
480
i~
BASE STATION LINEAR AMPLIFIER
115 VAC
I NSTALLATION&
OPERATION
INSTRUCTIONS
HV-GAIN
ELECTRONICS
CORPORATION
Rural Route 3
lincoln.
Nebraska 68505
This linear amplifier is a precision built, compact,
high output
amplifier of advanced design. It utilizes two tubes, two transistors
and three
diodes
in a grounded
grid, tuned
plate circuit
for
amplification
of AM, FM, CW and SSB signals
The 480 Linear Amplifier
will operate over the frequency
range
25-54 MHz. However, it is F.C.C. Type Accepted under Parts 89,
91, and 93 over the frequency range 25-40 MHz.
Operation
of this equipment
requires a FCC license. Failure to
comply
is punishable
by penalities set forth
in the Rules and
Regulations of the FCC. A copy of the Rules is available from the
U.S. Government
Printing Office and should be in the possession
of the operator.
This model Linear Amplifier
complies with FCC regulation when
shipped from the factory.
and must be used with a transceiver
which is FCC Type Accepted under Parts 89, 91, and 93 for the
system to be valid.
A special feature of this linear amplifier is the automatic antenna
change
over
relay
which
operates
without
special
external
connections
making
it perfect
for operation
with low power
transceivers not having external amplifier control circuits.
Variable plate tune and load capacitors offer impedance matching
for maximum
output
to varying antenna loads, in the 40 to 70
ohm range.
The front panel indicator lights provide reliable visual indications
of
proper
amplifier
operation
without
complicated
metering
circuits.
The
linear
amplifier
has been
designed
and
construGted
to
suppress spurious radiation that may cause television interference.
The TVI problem
was given full consideration
in design and
layout of the chassis.
There are, however, some types of TVI that cannot be prevented
within the amplifier. This particularly true in weak signal areas. In
such cases, a good commercial low-pass filter is recommended.
Height
4
1/8"
Width
7
1/8"
Depth
103/8"
,,-.,
Net Weight
11 Pounds
Shipping Weight
12 Pounds
Construction
Light weight aluminum chassis
with rugged steel case
Power Requirements
120 VAC/3 amps
Frequency Range
25-54 MHz*
Types of Emission
AM, FM, CW, SSB, DSB
Power Output (ave.). Slightly less at 50 MHz
220 Watts
PEP, minimum 80 watts carrier
Drive Requirement for Rated Carrier Output
3.5 Watts
Drive Requirement to Trigger Antenna Relay
1 Watt
Max Drive (unmodulated
carrier
and FM)
15 Watts
(amplitude
modulated
carrier)
3.5 watts
(amplitude
modulated
peak)
,14 watts PEP
Harmonic Supression
suppressed more than 60 db
Input Impedance (unbalanced)
50 Ohms
nominal, less than 2: 1 VSWR 25-54 MHz*
Output Impedance (unbalanced)
50 Ohms
nominal, Adjustable 40·70 ohms, non-reactive
Antenna Switching
Automatic provided by RF
sensing network
Tube and Diode Complement
.. 2 Tubes, 2 Transistors, 3 Diodes
Cable Connector Data
Input and output require
MIL PL-259
*F.C.C. Type Accepted for frequency range 25-40 MHz only
Carefully remove the Linear Amplifier from the packing carton.
Examine it closely for signs of shipping damage. Remove the four
screws holding the top cabinet and remove all hold down tape
and packing materials. Check to insure tubes are seated in the
sockets.
Install the plate caps on the tubes and the fuse in the
holder. Inspect for any signs of internal damage.
Do not attempt
to operate your Linear Amplifier or make any
connections
until
you
have read
this entire
manual
and
understand your amplifier fully.
The location is not critical but care should be taken to insure
adequate ventilation.
DO NOT SET ANY EQUIPMENT ON TOP OF THE CASE OR
COVER THE AMPLIFIER
WITH BOOKS, PAPERS, ETC., OR
OVERHEATING
WILL RESULT. ALLOW AT LEAST FOUR
U\lCHES OF CLEARANCE ON ALL SIDES OF THE CABINET
FOR GOOD AIR CIRCULATION.
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