AM-2 Reflected Power Meter
With the Heathkit Reflected Power Meter, model AM-2, you no longer have to worry about the efficiency of your antenna system. The AM-2 is ideal for checking the match of the antenna transmission system, by measuring the forward and reflected power or standing wave ratio. It is designed to handle a peak power of well over 1 kilowatt of energy and may be left in the antenna system feedline at all times. Band coverage is 160 meters through 2 meters. Input and output impedances provided for 50 or 75 ohm lines. No external power is required for operation. Meter indicates percentage forward or reflected power, and standing wave ratio from 1:1 to 6:1. A control is provided in the meter circuit to adjust the reading from off-scale to full scale reading without the necessity of reducing the transmitter output to acquire the proper "on-scale" level.
Another application for the AM-2 is matching impedances between exciters or RF sources and grounded grid amplifiers. Power losses between transmitter output and antenna tuner may be very easily computed by inserting the AM-2 in the line connecting the two. No insertion loss is introduced into the feeder system, due to the fact that the AM-2 is a portion of coaxial line in series with the feeder system and no internal connections are actually made to the line. Input and output coaxial connections are provided at the rear of the AM-2 cabinet. A complete circuit description and operation instructions are provided in the manual. Cabinet size is 7 3/8" x 4 1/8" x 4 5/8". This unit can be conveniently located at operating position and will provide an accurate reading of the function of the antenna configuration at all times.
SPECIFICATIONS: R.F. Power Handling Capabilities... One full kilowatt. Input and Output Impedance... 50 and 75 ohms. Power Requirements... None externally. Band Coverage... 160 through 2 meters. Meter... 100 microamperes, full scale. Operation... Indicates percentage, forward and reflected power, and standing wave ratio from 1:1 to 6:1. Cabinet Size... 7 3/8" x 4 1/8" x 4 5/8".