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joe veras © 2004 |
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Johnson Viking Five Hundred In 1956, E.F. Johnson followed the lead established by a popular women’s swimsuit of the era and introduced its two-piece Five Hundred transmitter. The power supply and modulator are housed in one box, while the other unit contains the RF deck, speech circuits, meters and controls. Combined weight of the two totals 175 lbs; the power supply/modulator unit accounts for 80% of this. The Five Hundred was designed so that the operator can place the RF deck on the tabletop while the large, heavy part of the transmitter rested on the floor or other out-of-the-way spot. It ran a substantial 600 watts input and used the familiar Johnson differential keying on CW. Input Power on AM was 500 watts to the transmitter’s 4-250A final (on early models; later models used a 4-400A). The modulators are a pair of 811-As. The transmitter was rated at 500 watts P.E.P. when used with an external SSB exciter. The Five Hundred covered 80 through 10 meters and sold for $649.50 as a kit or $799.50 factory-wired.
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