Ameritron awm 30 schematic

a cross-needle meter so that peak or average Foward power,

1.

2.

3.

1.

2.

1.

2.

3.

4.

1.

2.

3.

Next set the pushbuttons to the 2000 watt power scale. Transmit

4.

To set the reflected power, interchange the transmitter and

coax cable so that the transmitter is connected to the antenna

connector and the dummy load is connected to the transmitter

connector. Set the range switch to the 200 watt range. Transmit

10 watts as indicated on the reference meter and adjust LOW

REFLECT to indicate 10 watts on the reflected scale of the ATR-

30. Next set the range switch to the 2000 watt scale. Transmit

100 watts according to the reference meter and adjust HIGH

5.

Reflected power, and SWR can be read. Foward power is in Two
ranges from 200 watts to 2000 watts. SWR is read from 1.1:1 to
5:1. Frequency range is from 1.8 to 60MHz.

The AWM-30 DELUXE HF PEAK READING SWR/WATTMETER utilizes

INSTALLATION

Connect the coax connector labeled TRANSMITTER to the
transmitter with RG-58/u cable. Use PL-259 connectors.

Connect the coax connector labeled ANTENNA to the antenna with
RG-58/u cable. Use PL-259 male connector.

If a lighted meter is desired, a 12Vdc power supply must be
connected. Use a standard 2.1mm coax with the center positive
and the sleeve ground. The METER LAMP ON/OFF switch will
activate the meter lamp.

FOWARD & REFLECTED POWER

Set the desired power range by using the switch on the front
panel labeled METER HI/LOW. The high range is 2000 watts
maximum.

The Peak Reading feature may be switched on/off by using the
push button on the front panel labeled METER PEAK/AVERAGE.

SWR MEASUREMENT

SWR is indicated by the crossing point of the two meter
pointers. While transmitting, read the SWR from the SWR line
nearest the crossing point.

Note: No SWR setting is needed at any range.

CALIBRATION

The ATR-30 has been calibrated at the factory. If it should
ever need to be recalibrated, then follow this procedure:

EQUIPMENT NEEDED

Transmitter capable of supplying enough power to obtain 1/2 to
full scale reading at 14 or 21 MHz.

50 ohm dummy load that is capable of handling full power that
the transmitter can put out and has better than a 1.15:1 SWR.

A power meter of known accuracy. The calibration will only be
as good as the standard meter.

50 ohm cables capable of handling the power. RG-58/u is
recommended. DO NOT USE RG-59 or RG-11.

METER CALIBRATION-refer to PC layout for trimpot location

Remove the top of the ATR-30.
Connect the equipment as shown in the diagram. Use 50ohm dummy

load for the antenna. Set the transmitter to 14MHz band.
Transmit about 100 watts as indicated on the reference meter.

Adjust LOW FOWARD to set 100 watts on the foward power scale.
1000 watts as indicated on the reference meter. Adjust HIGH

FOWARD to set 1000 watts on the foward scale.

REFLECT to indicate 100 watts on the reflected scale.
SWR requires no calibration.