Midland 13-898B, Manual

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în the actual transmission o£ either USB or LSB, the carrier is removed. AU of the modulation for
a transmission is concentrated in either the Upper of Lower sideband. In the receiver, the carrier
is reconstrueted and the intelligence or modulated voice is then detected, amplified and converted
into an audible sound heard at the speaker.
AM (Amplitude Modulation) has been the standard method of Citizens Band B réception and
transmission for many years’and most of the existing transecivers being used today are AM. Techni-
cally, Amplitude Modulation is Double Sideband (DSB). In this method of operation, a carrier is
transmitted which is modulated or mterrupted by voice on both positive and negative sides as re-
presented by figure 2.
Figure 2
C O M P A T tB ILlT Y
The 13-898B is designed to be completely compatible with all current modes of Class D operation,
including single sideband, (upper or lower), double sideband, or conventional AM and is equipped
with separate transmit ter circuitry to provide high level AM (Amplitude Modulated) transmissions
and Ttue SSB (Single Sideband) transmissions. The receiver section is also capable of receiving AM
and SSB. The mode of operation for both receiver and transmitter sections is automatically selected
by the mode seleetor switch.
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