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AR3030 operating manual
The currently selected VFO is indicated on the LCD by [A] or [B]. To change
from one to another simply press the [VFO] key. To return to the original VFO
press the [VFO] key again.
Note: The rotary tuning control is also often historically
referred to as the VFO.
6-4 TONE - Audio tailoring
The audio characteristic is adjustable on most modes via the [TONE] key on the
front panel.
Selecting a high tone setting may improve the listening quality of strong
broadcast services such as longwave but where adjacent interference is
experienced selecting the low setting may reduce the levels of annoying
heterodynes.
The current setting of tone is indicated on the LCD as [HIGH] or [LOW].
The actual audio tailoring characteristics are:
USB/LSB/AM/S.AM/FM
TONE High position cut off frequency 3000 Hz
TONE Low position cut off frequency 1800 Hz
CW
TONE key inoperative. Frequency set to 800 Hz
FAX
TONE key inoperative
6-5 Bandwidth and filters
The AR3030 is fitted with several standard
IF bandwidths including a cascade 8kHz/-
6dB ceramic filter (CFU455G2) for AM/
SSB/FAX/CW plus two audio bandwidths:
AM/S.AM
6kHz/-3dB in the normal position using the
legendary Collins eight resonator
mechanical filter (526 8636 010) and a
2.4kHz/-6dB Murata ceramic filter
(CFJ455K6) in the narrow position.
Should the narrow CW optional PCB
position not be used, it is possible to fit an
additional wider filter for AM such as
Collins 8.5kHz/-3dB 526 8561 020. Due to
the I.F. cascade filter, the widest possible
filter is 8.5kHz.
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