Cobra 2010 GTL WX Operating Instructions Manual page 15

Section IV Operation (Continued)
RECEIVING SSB SIGNALS continued
Once the desired SSB mode has been selected, frequency adjustment may be necessary
in order to make the incoming signal intelligible, the VOICE LOCK control allows the
operator to vary frequency above and below the exact-center frequency of the received
signal. If the sound of the incoming signal is high or low pitched, adjust the operation
of the VOICE LOCK. 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, voices 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 rotates in the wrong direction (opposite sideband) no amount of
speed control (VOICE LOCK) 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 VOICE LOCK control. For simplicity it is recommended that
the AM modes be used to listen to AM signals.
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