AMERITRON AL-811HY Manual - 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 operator's 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.
FM, RTTY, PACKET, AMTOR:
The plate current should be limited to 400mA maximum. The
grid current should be limited to 120mA and the amplifier
should be 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-811H 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 receive 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. Ameritron offers a high
160 meters
DO NOT ATTEMPT TO PUT THIS AMPLIFIER IN SERVICE WITH THE COVER REMOVED!
CONTACT WITH VOLTAGES INSIDE THIS AMPLIFIER CAN BE FATAL!
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-811H will operate with full output on all WARC bands except 24.5 MHz
The AL-811HX/HY will operate with full output on all WARC bands
STANDARD FREQUENCY COVERAGE
AL-811H
1.8 - 2.0 MHz
80 meters
3.5 - 4.0 MHz
40 meters
7 - 7.3 MHz
30 meters
10.1 - 10.15 MHz
20 meters
10.4 - 14.35 MHz
17 meters
18.1 - 18.2 MHz
15 meters
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 FM, RTTY,
PACKET, and AMTOR section. Poor linearity, splatter, or even
damage to components, may result from failure to follow
instructions.
speed switching option for operators who 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 they 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. No modifications
are required to the amplifier with the QSK-5.
Ameritron for details on the QSK-5.
AL-811HX/HY
160 meters
80 meters
40 meters
30 meters
20 meters
17/15 meters
12/10 meters
WARNING!!
Never "retune" the amplifier to produce higher
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
Contact
ALWAYS