Note
The HM-102 was the most successful of a line of SWR meters that began with the AM-2 in 1957, and ended with the HM-2140 in 1979. In this iteration Heath added a wattmeter and built it all into a smart-looking cube adorned with the SB color scheme.
The 102 has two switch-selected ranges: 0-200 watts and 0-2000 watts. The unit features a built-in calibrator permitting 10 percent accuracy throughout the 80-10 meter bands, low-loss toroidal circuitry, and a removable sender unit that permits the meter to be placed up to six feet away.
The HM-102 is designed for continuous duty, has a working frequency range of 3-30 MHz, and is fitted with SO-239 connectors. Note: The HM-102 is designed for use only with 50Ω systems, and will not function well with other impedances. In 1973 Heath released a matching VHF unit—the HM-2102. The HM-102 has a light green cabinet and an SB green wrinkle front panel.
References
Review. Popular Electronics, Sep 1971, p. 80.
Photos, general information and specifications from "Heathkit: A Guide to the Amateur Radio Products," by Chuck Penson, WA7ZZE. Used with permission.