. QST . 5K| BALANCE .0° lO/^. finnrff] Fie 1 — Simplified schematic of the balanced modulator circuit used in the 51SB. The phase shift is obtamedbv proper constants at Li and C. In the actual unit, these constants are switched for each band change, as is L2. Sideband selection is obtained by reversing the polarity of one of the audio channels. One cathode of each balancedmodulator is opened for carrier unbalance when tuning the following stages. March 1955 41. The subassembly of the51SB, with the bandswitch shaftand the balanced-modulator tun-ing shaft removed to permit bet-ter
. QST . 5K| BALANCE .0° lO/^. finnrff] Fie 1 — Simplified schematic of the balanced modulator circuit used in the 51SB. The phase shift is obtamedbv proper constants at Li and C. In the actual unit, these constants are switched for each band change, as is L2. Sideband selection is obtained by reversing the polarity of one of the audio channels. One cathode of each balancedmodulator is opened for carrier unbalance when tuning the following stages. March 1955 41. The subassembly of the51SB, with the bandswitch shaftand the balanced-modulator tun-ing shaft removed to permit bet-ter visibility of the parts. Thecompartments, from left to right,are 6V6 amplifier (the shieldstraddles the socket), 6CL6 am-plifier, balanced modulators, phase-shift networks. point, the front panel carries the VFO knob (alarge one), bandswitch, meter switch for measur-ing grid and plate current of the output stageand plate current of the modulator, a CW-VFO-PH switch for selecting the mode and for spottingfrequency, and , Tune-Operate and Plateswitches. Once the band is selected, the operatorhas only to set the VFO and adjust the platetuning and loading controls of the output stage,touching up the excitation control also, if neces-sary. The VFO frequency can be easily read onthe slide-rule type scale. The 52SB Single-Sideband Generator The companion generator for the 5100 isa small 10 X Uli X 145i-inch package thatis placed to the right of the t
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectradio, bookyear1915
