After the first two filters of the original 8640Jr design had been built, I headed off in my own direction to add another two filters for lower bands. I miscalculated, and designed the filters to cutoff just after the third harmonic of the lowest frequencies, rather than the second, which would have placed it near […]
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In July of 1981, Mom gave me a nice birthday gift. A Kenwood TR-7800 2-meter mobile rig. It had 25 watts out, and a synthesizer to eliminate the need for crystals. There was no tone board installed, but you really didn’t need one in the midwest back then, as few of the repeaters had tone […]
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