AMERITRON AL-811HD Buku Petunjuk - Halaman 7

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CW PROCEDURE

Follow the instructions in numerical order. If the various meter

readings are different than those indicated in the instructions,

check the connections from the exciter to the amplifier and

make sure they are correct. Consult the manual for the exciter,

if necessary. Be sure the transformer is correctly wired for your

line voltage.

See the

instructions on page 4 for wiring details.

1. Set the AL-811HD front panel switches as follows:

POWER/OFF-ON to OFF

XMT/OPR-STBY to STBY

METER/Ip-HV to HV

2. Plug the line cord into a proper voltage outlet.

3. Set the POWER switch to the ON position. The meter

lamps should light and the fan should start. Read the 2000

volt scale on the multimeter. It should indicate 1700 volts

nominally and no more than 1800 volts.

4. With the amplifier XTM switch still on STBY, check the

VSWR of the antenna. The antenna must be 2:1 VSWR or

less to operated the amplifier. SWR above a 2:1 will have

to be tuned with a tuner between the amplifier and antenna.

( the transceiver's internal tuner can not be used to tune the

antenna during the use of an amplifier) Turn the exciter

drive fully down after tuning.

5. Place the amplifier bandswitch on the same band as the

exciter, the PLATE control in the dial range for the

band selected, and the LOAD control as indicated:

6. With the exciter drive still at zero, place the

METER/HV-Ip switch in the Ip position. Observe

the 750mA scale.

XMT/STBY-OPR switch in the OPR position

7. Key the exciter (no drive). (exciter in SSB and Mic Gain

turn off) The Transmit (XMT) LED should light. Observe

the plate current on the 750mA scale. It should be 75mA.

POWER CONNECTIONS

It should read zero.

Place the

TUNE-UP

MHz

Load

1.80

6 1/2

1.90

7 1/2

3.5

3.7

4.0

5 1/2

7.0

7.3

3 1/2

NOTE: The no drive current will vary up to 25% due to

component and line voltage tolerances.

tune up, limit Key to 7 seconds. This will keep the

tubes from overheating.

This amplifier is equipe with a electron grid overload

circuit. When peak grid current reaches 190 mA

the amplifier will go to stan-by and the red XMIT

LED will not light.

by/ Operate Swiich

8. Place the tranceiver in CW, FM or RTTY mode and

apply only enough drive to indicate a grid current of

100mA, or an Ip of no more than 450mA. Tune the

PLATE control for maximum output power.

normal for the plate current to dip at this point. If the

grid current goes over 200mA, reduce the drive at

once. Unkey the exciter.

9. Observe the output on an external RF wattmeter. Increase

the drive until 180 mA of grid current or 750 plate mA of

plate is achieved. (never to exceed 80 watts). Quickly

adjust the PLATE and LOAD controls for maximum

output power.

10. Reduce the drive until the desired output levels are

obtained.

NOTE: Rotating the LOAD control clockwise reduces grid

current for a given amount of drive. If the LOAD

control is set at too low a numerical setting, a severe

stress on tank components may occur. The PLATE

control should always be peaked for maximum grid

current or output power. Do not exceed 750mA of

plate current during tune-up.

Plate

MHz

1 1/2

10.1

14.0

18.1

21.0

6 1/2

24.9

28.5

Reset by toggling the Stand-

Load

Plate

7 1/2

2 1/2

9 1/2

4 1/2

9 1/2

During

It is