Changing Vfo A/B - AOR The New Classic AR3030 Operating Manual

AR3030 operating manual
Rotate the RF gain control anti-clockwise so that the S-meter needle just "lifts"
with voice peaks, this can reduce the background noise especially during
pauses in speech.
Do remember that reducing the RF GAIN control (which increases deflection of
the S-meter) reduces the sensitivity of the receiver, the normal position is fully
clockwise.
USB
Upper Side Band - The same comments apply as for LSB. By convention,
Radio Amateurs also use USB above 10MHz.
An optional Collins 2.5kHz 8 resonator mechanical filter of high specification
may be fitted in place of the standard 2.4kHz Murata ceramic filter for improved
selectivity.
CW
Continuous Wave - Often referred to a Carrier Wave or Morse code. Selection
of CW changes the audio tailoring to best suite reception of "dots and dashes".
A 500Hz Collins 7 resonator mechanical filter may be optionally fitted in the
NARROW filter position and will greatly aid rejection of unwanted signals on
this mode.
FAX
Facsimile - Selection of [FAX] optimises the receiver for reception of weather
and news facsimile. The 2.4kHz standard SSB filter is employed but audio
tailoring is optimised for facsimile reception. A constant level 0dBm 600 OHM
audio output is available through a rear panel 3.5mm FAX OUTPUT socket
ready to feed an external facsimile decoder / printer such as the AOR
WX-2000.

6-3 Changing VFO A/B

In the true sense of the word, "VFO" stands for Variable Frequency Oscilla-
tor. Of course as technology improved so modern receivers do not strictly use
a VFO, in the case of the AR3030 a Direct Digital Synthesizer (DDS) is
employed.
However, the term "VFO" has generally come to mean "current tuning
parameters" and refers to the tunable frequency currently displayed along with
mode and other settings such as attenuator, filters etc.
In this sense, the AR3030 has two VFOs' available A and B.
Two VFOs' can be useful for listening to split frequency communications such
as a DX pile up on the Amateur bands where a much sort after station is
transmitting on one frequency but listening on another. Another example would
be coastal marine communications where split frequencies are employed.
Should the optional VHF converter be fitted then split frequency operation
(known as DUPLEX) is common place. (Single frequency operation is known
as SIMPLEX).
26