AMERITRON AL811 Panduan Memulai Cepat - Halaman 9
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SSB:
Tune up the exciter and amplifier as described in
section and switch the exciter to SSB. Normal ranges of meter
readings on SSB are between 20 and 50 percent of the CW
carrier readings. This is due to the different peak to average
power ratios in the operators speech waveform. The only true
way to measure peak output power is with a good peak reading
wattmeter or monitor scope. A whistle should produce the same
values obtained on CW. Any effort to run more than these
values will produce splatter and distortion.
SSTV, FM, RTTY, PACKET, AMTOR:
The plate current should be limited to 400mA maximum. The
grid current should be limited to 120mA and the amplifier tuned
for peak output power with the drive reduced to hold the grid
and plate currents below the ratings given.
The open frame relay in the AL-811 takes approximately 15ms
to switch states. This precludes using the standard internal relay
for QSK CW operation. Commonly available vacuum relays are
very marginal for high speed QSK operation. At 60 WPM less
than 50% of the available deceive time can be used due to the
slow speed of vacuum relays. On PACKET, AMTOR and other
modes delay can be added to the transmit and receive
changeover to use either vacuum or our standard conventional
relay effectively.
160 meters
80 meters
40 meters
30 meters
20 meters
17 meters
15 meters
DO NOT ATTEMPT TO PUT THIS AMPLIFIER IN SERVICE WITH THE COVER
REMOVED! CONTACT WITH VOLTAGES INSIDE THIS AMPLIFIER CAN BE FATAL!
ALWAYS DISCONNECT THE AMPLIFIER FROM THE POWER MAINS AND WAIT FOR
THE FILTER CAPACITORS TO DISCHARGE BEFORE REMOVING THE COVER.
7
OPERATION OF OTHER MODES
TUNE UP
QSK OPERATION
The AL-811 will operate with full output on all WARC bands except 24.5 MHz.
The AL-811X will operate with full output on all WARC bands.
STANDARD FREQUENCY CONVERAGE
AL-811
1.8 - 2.0 MHz
3.5 - 4.0 MHz
7 - 7.3 MHz
10.1 - 10.15 MHz
14.0 - 14.35 MHz
18.1 - 18.2 MHz
21.0 - 21.45 MHz
NOTE: Some exciters put out short duration high power RF
pulses when first keyed. Exciter power output peaks may reach
or exceed full output level settings even if the exciter's power
control is adjusted to deliver a fraction of full power under
"keydown" conditions.
The amplifier loading control must be set high enough
(clockwise) to prevent extremely high energy levels from
developing in the plate and grid circuits of the amplifier. DO
NOT "UNDERLOAD" THE AMPLIFIER TO REDUCE
POWER.
efficiency with reduced drive except under the SSTV, FM,
RTTY, PACKET, and AMTOR section. Poor linearity, splatter
or even damage to components may result from failure to follow
instructions.
Ameritron offers a high speed switching option for operators
that require high speed switching between receive and transmit.
The system switches in one mS. Therefore, these systems are
several times faster than available vacuum tube relay systems
and allow over 90% of the available receive time to be used at
60 WPM. The QSK-5 stand alone PIN diode switch can be used
with almost all types of amplifiers and transmitters.
modification are required to the amplifier with the QSK-5.
Contact Ameritron for details on the QSK-5.
160 meters
80 meters
40 meters
30 meters
20 meters
17/15 meters
12/10 meters
WARNING!!
Never "retune" the amplifier to produce higher
AL-811X
1.8 - 2.0 MHz
3.5 - 4.0 MHz
7 - 7.3 MHz
10.1 - 10.15 MHz
14.0 - 14.35 MHz
18.1 - 21.45 MHz
24.9 - 29.7 MHz
No