. QST . The 75A-4 offers passbandtuning, AVC for Single Side-band reception, a bridged Trejection notch filter, a crys-tal calibrator circuit, separatedetectors for double or single sideband signals, a new noiselimiter circuit that works equally well on SSB, AM or CW,and mounting provision for three separate MechanicalFilters. Retained are the time-proven features of the earlier75A series — double-conversion, crystal-controlled firstinjection oscillator for high stability and good image re-jection; permeability tuned, sealed master oscillator withaccurate dial calibration and long-term stabili
. QST . The 75A-4 offers passbandtuning, AVC for Single Side-band reception, a bridged Trejection notch filter, a crys-tal calibrator circuit, separatedetectors for double or single sideband signals, a new noiselimiter circuit that works equally well on SSB, AM or CW,and mounting provision for three separate MechanicalFilters. Retained are the time-proven features of the earlier75A series — double-conversion, crystal-controlled firstinjection oscillator for high stability and good image re-jection; permeability tuned, sealed master oscillator withaccurate dial calibration and long-term stability, and Me-chanical Filters in the IF circuits for maximum selectivity. 32W-1EXCITER. Designed to meet the require-ments of the most discrimi-nating Amateur whether heoperates SSB, AM or CW, the32W-I Exciter has sufficientoutput power to drive a high-level power amplifier stage,and together with the 75A-4Receiver provides the basicneeds for a completely engin-eered Amateur radio installation. Special features of the32W-I are dual conversion, a permeability tuned, hermeti-cally sealed VFO, a Single Sideband generator using theCollins Mechanical Filter to provide optimum rejection ofthe unwanted sideband, RF feedback to assist in reductionof distortion products, selectable sidebands, bandswitchingoperation on all amateur bands from to 30 mc, VOX orpush-to-talk operation, AM operation with full carrier andone sideband being transmitted, CW operation with waveshaping for minimum key clicks and transients, FSK opera-tion by using an external audio FSK oscillator. AutomaticLoad Control (ALC), and unitized construction. 80
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectradio, bookyear1915
