Thus when a voice is used in place of a whistle or tone, in the proper listening
mode the voice will be received correctly whereas in the incorrect mode, the
voice will be translated backwards and cannot be made intelligible by the
CLARIFIER control. When listening to an AM transmission, a correct side
band is heard in either mode since both upper and lower side bands are
received.
Once the desired SSB mode has been selected, frequency adjustment may be
necessary in order to make the incoming signal intelligible. The CLARIFIER
control allows the operator to vary frequency above or below the exact
frequency of the channel. If the sound of the incoming signal is high or low
pitched, adjust the operation of the CLARIFIER.
Consider it as performing the same function as a phonograph speed control.
When the speed is set too high, voices will be high-pitched and if set too low,
voice will be low-pitched. Also, there is only one correct speed that will make a
particular record produce the same sound that was recorded. If the record is
played on a turntable that is rotated in the wrong direction (opposite side band)
no amount of speed control (CLARIFIER) will produce an intelligible sound.
An AM signal received while listening in one of the SSB modes will produce a
steady tone (carrier) in addition to the intelligence, unless the SSB receiver is
tuned to exactly the same frequency by the CLARIFIER control. For simplicity,
it is recommended that the AM modes be used to listen to AM signals.
ALTERNATE MICROPHONES AND INSTALLATION
For best results, the user should select a low-impedance dynamic type
microphone or a transistorized microphone. Transistorized type microphones
have a low output impedance characteristics. The microphones must be
provided with a four-lead cable. The audio conductor and its shielded lead
comprise two of the leads. The third lead is for transmit control and the fourth
is receiving control.
The microphone should provide the functions shown in schematic below.
4 WIRE MIC CABLE
Receive Control
4
Transmit Control
3
Audio Lead
2
Audio Shield
1
Mic Cable Lead
Pin Number
Fig. 1
Your transceiver microphone schematic.
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