Hobby Electronics LA-2155H User manual

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IFeatures:
The LA-2155H two meter linear amplifier is designed for use in
base station, mobile, hand-held and all kind of transceivers and in all
mode (LA-2155W and LA-2180 are for mobile tansceiver use only).
The LA-2155 has its own built-in pre-amplifier for excellent weak
signal reception. The GaAs FET pre-amp design assures
outstanding reception with lowe signal to noise ratio. The LA_21SS
is rugged, yet convenient. The large heatsink and versatile
protection circuitry guarantee dependable operation under virtually
any conditions. Amplifier status can be checked easily with the
metering and L. E. D. indicators. Other convenience features
include: switchable HIGH/LOW power output, RF activated stand_
by circuitry, externally activated stand-by option, and large
switches for easy operation.
TSPECIFICATION
MODEL
144-1,48MH2
CW/FM/SSts
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13.8V DC 254 13.8V DC 3OA
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2.6kg
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OUTPUT CHANGE
SWITCH @7iV-r)&7<'v+
DELAY TIME SELECTOR
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OUTPUT
TERMINAL
(FOR LA-2155H USE) INPUT TERMINAL
@-ron HAND-HELD @-ron MoBTLE
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DC BATTERY CABLE
lReadying the LA-2155 for Operation:
1. Connect your antenna cable to the antenna terminal of the
LA-2755.
2. For mobile use, connect the DC power input cable of the
LA-2I55 directly to your car battery. DO NOT USE THE
CIGARETTE LIGHTER SOCKET. If you find it necessary to
extend the LA-2155 power cable, be sure to use the same
gauge wire or thicker. Soldering at the splice point is
recommended.
3. For fixed station use, surplus power supply will be necessary
for sufficient output power. This power supply must be capable
of providing 13.8 VDC at 25 amps continuous. The Daiwa PS-
560MD is recommended.
4. If the LA-2155 RF activated stand-by circuitry fails to
operate properly in the SSB mode (relay seem to "chatter"), it
may be necessary to use the external stand-by option. Connect
a cable from pin p of the LA-2155 external stand-by socket to a point
in your transceiver that receives *13.8
VDC during transmit. Connect pin @ to a
point in your transceiver that is switched
to ground during transmit. (Use this
I connection when a source of "switchable"
12 volts is not available) Connect pin I
to the chassis of your transceiver. Set the
DELAY switch to the OFF position.
IOPERATION:
1. In case of LA-2155H, select the input change switch in rear
panel, @-for mobile transceiver use or @-for hand-held
transceiver use.
2. Switch the LINE @ switch to the ON position. The power
indicator L.E.D. @) should glow.
3. Check to see that the PROTECTION circuit L.E.D. @is not
on. This L.E.D. indicates an excessive SWR (greater than
1.5:1), open antenna line, or shortecl antenna line The I .L-2155
will not work when the protection circuit is activated. Once the
malfunction has been corrected, the PROTECTION circuitry
can be de-activated by turning the LINE switch OFF and then
back ON again.
4. When the PRE-AMP switch @ is ON, the built-in pre-amp
can be operated, the L.E.D. @ will glow to indicate operation.
The sensitivity of your receiver will be significantly increased in
all modes.
5. DELAY TIME SELECTOR-In the ON position, transmit/
receive changeover will be delayed by about 1 second. You can
use the delay for SSB and CW operation. Place the switch in the
OFF position for FM use.
6. POWER OUTPUT SWITCH-Placing this switch @ in the
LOS position will decrease output power by approximately SOVo.
An L.E.D. will glow to indicate decreased power output.
7. The OUTPUT POWER METER indicative power output.
8. FUSE HOLDER () Always replace with a 25 amp fuse.
TCAUTION!!
1. Out cover will heat after 5 minutes use.
Transistor span of life will shorten under bad condition
Do not mount in an area where it will be exposed to long period
of direct sunlight. When using in a car, do not place near car
heater. Available to have stabilized operation under cooling it
with fan.
2. In mobile use, do not place your LA-2155 near the heater
vents.
3. Do not use more than 50 watts input power. Excessive input
power levels will cause distorted audio and spurious signals. It
may also damage the amplifier. (Below 6W in case of LA-2155H
switched @)
4. Do not at tempt to adjust internal coils or trimmer
capacitors. Refer all adjustments to your dealer.
5. The LA-2155 draws about lmA. of current even when it is in
the OFF position. It is recommended that you disconnect the
LA-2I55 power cable whenever yuou anticipate that your car
will be unused for a long period of time.HOEBY ELECTFIOMCS@
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IOKYO 141. JAPAN. Tel:O3-4S4 3478 Fax:[phone]
aDAIWA E ætronics Co|o.
19Oa-A DEL AMO BLVD. TORRANCE CA 9O5O1 1303 U.S.A. a213 212.,€ic,57
PRINTED IN JAPAN

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