AfterBurner 420 Instruções de instalação e operação - Página 2

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RED Indicator Light

Output Meter

Tune Knob

Load Knob

Th is ampl ifier must be used with a transm itter or transceiver

capable of at least one watt output, in the 25-54 MHz range.

First place the fu nction switch in the AM-FM position. Set the

tune control in accordance with the warning

manual. The load control

capacitor is fully

meshed, (dot on knob will then point to the

word "load" on the front panel).

Now push the ON-Off switch to ON. The red visual indicator light

will light.

After

warm-up,

push the XMT-Standby

energize the automatic

antenna relay control

provide power for the integrated circuit receive amplifier.

Apply

drive

power

microphone and quickly adjust the tune control for maximum

deflection

on the output

adjustment.

Do not apply drive power for more thEm five seconds

adjusting

the tune control or damage to the tubes can result.

Reapply drive power and advance (clockwise) the load control,

note the increase in deflection of the output meter. Adjust the

load control for maximum output. Remove drive power.

Readjustment

of the

tuning

times

will produce

maximum

To provide for the extra power contained in the AM signal

modulation

it is necessary to "overcouple"

This is necessaryto insure an undistorted output with a minimum

of adjacent channel "bleeding" (spatter).

Reapply drive power and advance the load control until the

output

meter drops perceptably,

rotation).

Readjust the tune control for maximum output. The

output circu it is now" overcoupled".

If a relative power output indicator is available (SWR bridge on

forward, etc.) the output signal can be quickly checked to insure

Visual indication of

appl ied 115 V AC power.

Visual indication of

relative RF power output.

Adjusts resonant frequency

of amplifier.

Adjusts coupling of

output circu it to. antenna.

on page 3 of the

should be positioned so that the

XMT. This will

circuitry,

keying

the

exciter

(transceiver)

meter. Remove drive power after

without

and loading

controls

several

output.

the output circuit.

(about

15 per cent more

upward modulation.

voice peaks, the load control is improperly set (or the exciter is

not capable of 100 per cent modulation or may have "downward

modulation").

Also seen on output meter.

Automatic

antenna change over and amplifier

provided for by a special transistorized input sensing circuit.

Should you desire to hold the amplifier in a "ready" condition,

but not use it until needed, simply place the XMT-Standby in the

standby position. The sensing circuit will be disabled and the

antenna connected to the exciter (transceiver) at all times.

With the XMT-Standby

REC AMP switch

should be in the OFF position.

prevent the receive amplifier

The amplifier is tuned for FM service in a manner identical

except the load and tune controls are set for maximum outp~t.

Place the function switch in the SSB position. This will connect a

and

delay circu it to the automatic

"drop-out"

approximately

"chattering" and erratic operation.

If the exciter (transceiver) is capable of carri?r output equal to

the peak power of the voice SSB or DSB signal, simply adjust the

tune and load controls for maximum deflection of the qutput

meter while applying carrier.

If the exciter (transceiver) cannot supply a carrier equal to the

peak power of the voice SSB or DSB signal then the tune and

load controls must be set for maximum output while modulating.

In this case, a modulation envelope indicator (monitor scope) is

the most reliable method for adjustment of the amplifier.

Place the function switch in the SSB position, apply drive power,

and adjust the tune and load controls for maximum output.

The delay circuit for SSB prevents "drop-out"

antenna relay between characters.

For operation on the six meter amateur band It

short out four turns from the left hand side as viewed from the

front panel of the Pi-network output coil, L 1. The 100pf silver

mica capacitor across C17 load capacitor, must be removed.~

remove capacitor C7, 50 pf disc ceramic located acrossthe I

socket of the rear panel.

If the meter does not "flick"

IMPORTANT

switch

in the standby POSition, the

loading the transceiver

relay control and extend the

one second. This will prevent relay

of the auto'matic

upward on

operation

This will

oytput.

necessaryto