AMERITRON ALS-1300 Technical Information download pdf (Page 12)

When operated outside the frequency limits above, harmonic suppression might not meet acceptable limits. You

may have to use additional external 2

harmonic filtering. Ameritron guarantees to exceed FCC part 97.307

harmonic suppression standards only inside the frequency ranges listed above. Contact Ameritron with your

specific requirements. Ameritron requires proof of a valid MARS or CAP license as well as your own amateur

radio license for technical assistance.

12/10 Meter Operation

Operation on the 12 meter and 10 meter ham bands requires the installation of the optional MOD-10MK low

pass filter assembly. The MOD-10MK is installed on export models of the ALS-1300, but is NOT included on

amplifiers shipped within the US. Upon proof of a valid US amateur radio license, a MOD-10MK may be

purchased from Ameritron. The MOD-10MK can be installed in the amplifier in minutes using just a Phillips-

head screwdriver. Installation instructions are provided with the MOD-10MK.

Initial Operation

Double-check all wiring and connections (fig. 1) before turning power on. It always pays to be safe. If you are

sure you have connected your amplifier correctly, follow the procedures below. The following steps only need

to be done on an initial checkout:

1. Place the MULTIMETER switch (fig.2 ref 7) in the HV2 position. Place the ALC SET control (fig2.

ref 5) fully clockwise (10 on scale).

2. With the STANDBY/OPERATE switch (fig.2 ref 8) on STANDBY, turn the power switch (ref 9) ON.

3. There will be a 3-5 second step-start circuit delay, and then a click as the power supply turns on. HV2

(fig.2, ref 2) should immediately rise to nearly full scale, and after a slight delay you should hear another

click. The meters and BAND LEDS (fig.2, ref 4) will light up.

4. The HV meter (fig.2, ref 2) should read between 48 and 50 volts.

5. Change the meter switch (fig.2 ref 7) to HV1. The voltage should be the same as in step 4.

6. Rotate the BAND switch (fig.2 ref 3) through all positions. For any model purchased in the USA, only

the 160, 80, 40, 30, 20, 17, and 15-meter bands will actually operate. US operation on 12- and 10-

meters requires the optional user-installed MOD-10MK filter assembly.

7. Change the meter switch (ref 7) to REF. This will read reflected power.

8. Provide a low power (~10 watt) unmodulated carrier from your transceiver using FM, AM, RTTY, or

CW. Verify that the VSWR of the antenna system is low. You should see almost no deflection on the

reflected power scale (fig.1 ref 2). If you see reflected power, check your RF cables or antenna system.

Note: You must not use a tuner in your transceiver or between your transceiver and the ALS-1300

amplifier to match the antenna system. Any antenna matching must be between the amplifier and

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AMERITRON ALS-1300 Technical Information Page 12