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AR3030 operating manual
beyond the threshold point to prevent the receiver from stopping on noise or
very weak and unreadable signals.
If the control is rotated too far clockwise then weaker signals will be totally lost
and only local strong signals will be heard.
5-23 RF GAIN control
This small rotary tuning control is located on the front panel underneath the
BFO PITCH control.
The RF GAIN control reduces the level of amplification applied to the receiver's
I.F. circuits. This has the effect of reducing the sensitivity of the receiver in
much the same way as the attenuator but is more controllable.
The usual position for the RF GAIN control is fully clockwise when the set is at
its most sensitive. As the control is rotated anti-clockwise the S-meter will
advance to indicate what strength signal is required to produce solid and
readable results.
The control is most useful on SSB where the RF GAIN should be adjusted so
that the "peaks" of SSB signals just deflect the S-meter. This will greatly reduce
the level of background noise especially during pauses in speech or inactivity.
5-24 Rotary tuning control
The large rotary tuning control is prominently located on the front of the cabinet.
This control changes the received frequency up and down in whatever step
increment is selected by the [kHz] and [MHz] keys. The minimum tuning rate is
5 Hz. This control is often referred to as the "VFO".
5-25 S-meter (signal strength meter)
The rear illuminated analogue SIGNAL METER is located to the left hand side
of the front panel. Relative strength of incoming signal is indicated in standard
"S" points where S1 is weak and S9 is strong. Calibration above S9 is in dB.
As with other receivers, the calibration may not be reliable on FM mode.
5-26 Loudspeaker (internal)
The AR3030 is fitted with a large 66mm 3 WATT internal loudspeaker. Due to
clever design, sound is projected through a small front mounted speaker grille.
When an external speaker or headphone is connected, the internal speaker is
automatically disconnected.
Rear panel
18
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