Agc - Automatic Gain Control; Att - Attenuator Operation - AOR The New Classic AR3030 Operating Manual

General coverage receiver 30khz - 30mhz all mode

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AR3030 operating manual

USB/LSB/FAX

2.4kHz Murata ceramic filter (CFJ455K6). An optional 2.5kHz/-3dB Collins

eight resonator mechanical filter (526 8635 010) of higher specification may be

optionally fitted (workshop fitting) to replace the 2.4kHz filter. Should the narrow

CW optional PCB position not be used, it is possible to fit the optional Collins

2.5kHz filter as an addition which will be selected in the narrow position.

2.4kHz Murata ceramic filter in the Normal position. An optional 500Hz/-3dB

Collins seven resonator mechanical filter (526 8634 010) may be optionally

fitted (workshop fitting)in the Narrow position.

15kHz Murata ceramic filter (CFU455E2) fixed. Selection of Normal/Narrow is

disabled.

The AR3030 is fitted with several standard I.F. bandwidths:

Selecting a narrow filter setting can improve intelligibility under some

circumstances when listening to AM and S.AM. The fitting of a narrow

500Hz CW filter greatly improves the rejection of unwanted adjacent

signals. Indication of current setting is provide on the LCD as [NOR] or

[NRW].

6-6 AGC - Automatic Gain Control

This key is used to select the Automatic Gain Control setting on all modes

except FM. The status of AGC is indicated on the LCD as [FAST] or [SLOW]. It

is not possible to switch the AGC off.

Generally speaking [FAST] is used for CW and some data communications

reception and [SLOW] is used for USB & LSB. A slow setting on SSB can

reduce the background noise during pauses in speech.

For AM and S.AM reception the setting will depend on receiving conditions.

The attenuator can be useful for reducing the level of unwanted strong signals

or overload. The AR3030 has three settings for ATT, these being 0dB (no

indication on the LCD - normal setting), -10dB [10dB] indicated and -20dB

[20dB] indicated.

The AR3030 does not contain RF amplification prior to the band-pass filters, all

gain is applied in the more selective I.F. stages. This ensures the highest

immunity to intermodulation effects sometimes caused by a large number of

strong signals on the shortwave bands.

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