the Magnavox Stereo console my mom had(was a Concert Grand series)had the multiplex adaptor as well.Same as with some early stereo receivers I used to have at one time.the unit attached to the back and plugged into the Multiplex out and stereo in jacks on the back.At the FM transmitter sites I dealt with-they had the stereo generator that fed into the "composite" in on the tramsitter exciter.an early stereo gen I dealt with was all tube along with the exciter.the whole mess took up one 6 ft tall rack.today that would be a unit not more than 3 in high in the rack-or two rack spaces.Now its IBOC digital....Anyway sorry to "deviate"Term also applied to how much an FM transmitter is modulated.
Would love to see pictures of the CM Hi-Fi set. Sounds like an interesting and high quality unit.
also in the late fifties-as related to FM stations-they had to install the Stereo generators in their transmitters.The stereo generator developed the 19Khz pilot tone and the 38Khz sideband modulated stereo carrier.The pilot was neccessary for the "multiplex adaptor" to demodulate the 38Khz signal containing the L-r info. the L+r info was on the main modulation going to the transmitter.(the mono signal for those who had mono radios)If the station had an indirect modulated exciter or "serrosiod" exciter they had to replace it.some of those early FM tranmsitters had frequency multiplication in the power stages.If the tranmsitter was direct FM-stereo was not a problem.You added the stereo gen to the exciter.The reason those early exciters were so large is all of the frequency multiplier stages in them.The oscillator frequency was only like 200Khz-then multiplied to the stations assigned licensed frequency.If the stero pilot and 38Khz sidebands went thru all those multipliers-they were lost.It was a big deal and expense to some of those early stations.In the fifties-FM was high technology.
Would love to see pictures of the CM Hi-Fi set. Sounds like an interesting and high quality unit.
also in the late fifties-as related to FM stations-they had to install the Stereo generators in their transmitters.The stereo generator developed the 19Khz pilot tone and the 38Khz sideband modulated stereo carrier.The pilot was neccessary for the "multiplex adaptor" to demodulate the 38Khz signal containing the L-r info. the L+r info was on the main modulation going to the transmitter.(the mono signal for those who had mono radios)If the station had an indirect modulated exciter or "serrosiod" exciter they had to replace it.some of those early FM tranmsitters had frequency multiplication in the power stages.If the tranmsitter was direct FM-stereo was not a problem.You added the stereo gen to the exciter.The reason those early exciters were so large is all of the frequency multiplier stages in them.The oscillator frequency was only like 200Khz-then multiplied to the stations assigned licensed frequency.If the stero pilot and 38Khz sidebands went thru all those multipliers-they were lost.It was a big deal and expense to some of those early stations.In the fifties-FM was high technology.
