Note
The HM-2141 is functionally identical to the HM-2140 except that it covers from 50 to 175 MHz with a forward maximum of 300 watts and a reflected maximum of 100 watts.
There are two power ranges: 0-30 or 0-300 watts forward and 0-10 watts or 0-100 watts reflected. The remote sensor is factor assembled and calibrated. See listing under HM-2140 for additional discussion.
Requires a 9 volt battery or power cube. To check the battery, rotate the SENSITIVITY control fully counterclockwise until it clicks and press the PEP/AVG switch.
Note: Best results are obtained with readings that are greater than the mid-range of the meter. Although it is possible to use the meter with low-power transmitters, best results will be with power levels of 5 watts or greater, since accuracy is specified as a percentage of full scale.
Note: Load impedance is not specified, but calibration is done with a 50Ω dummy load. Operation with other impedances will produce unreliable readings.
The 2141 is finished with the classic two-tone SB green wrinkle paint. No brown colored “A” version was ever made. The HM-2141 and the HM-2140 are indistinguishable from a distance.
References:
Review. QST. Sep 1980, p. 41.
Frequency range: 50 to 175 MHz
Functions: forward and reflected power (average and PEP), and SWR
Meter ranges:
forward (2 scales): Low, 0 to 30 watts; high, 0 to 300 watts
reverse: (3 scales): low, 0 to 10 watts,; high, 0 to 100 watts; SWR, to 3:1
Insertion SWR: less than 1.05:1
Accuracy (full scale):
30 and 300 watts (forward), 100 (reverse): ±5% (average)
10 watts (reverse): ±7.5% (average)
Power requirements: one 9-volt battery (NEDA 1604), or power cube
Photos, general information and specifications from "Heathkit: A Guide to the Amateur Radio Products," by Chuck Penson, WA7ZZE. Used with permission.