Kenwood TS-670 Instruction Manual page 11

(1) How to use the RF ATT switch
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RF attenuater
(2) How to use the RF control
RF control
AF GAIN—®— RF GAIN
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S-meter reading at
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attenuated AF GAIN -@)— RF GAIN
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clockwise
Full Clockwise
RF GAIN Control Operation
(3) How to use NB switch
NB switch
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RF ATT SWITCH
When this switch is turned on the input to the receive RF
amplifier is attenuated approximately 20 dB, providing
distortion-free reception. This feature may be used in cases
of receiver overload, caused either by a strong local signal,
or during weak signal reception when a strong adjacent
signal may blank the receiver.
RF GAIN CONTROL
For normal operation, this control should be turned fully
clockwise for maximum sensitivity. Receive sensitivity is
reduced by turning the control counterclockwise.
Adjust the RF GAIN so the S-meter does not show ex-
cessive deflection. This minimizes noise during reception
and allows the S-meter to indicates signal peak (or a little
below that point). Noise is markedly reduced when signals
are absent.
NB SWITCH
The TS-670 has a sophisticated noise blanker designed to
reduce ignition-type pulse noise. The noise blanker is par-
ticularly important for mobile operation. When necessary,
activate the noise-blanker by depressing the NB switch to
ON.
SQUELCH
To eliminate receiver noise during no-signal periods, slowly
advance the squelch clockwise until the noise just disap-
pears (threshold point).
The squelch will open and the speaker will operate when a
signal is received. If the signal is weak or fades, readjust
the squelch for consistent reception.
NOTE:
Squelch operation is possible in all (FM, SSB, CW and
AM) modes, but the threshold point differs a little in
each mode. Operation of the squelch circuit also varies
depending on the external noise strength.