AOR The New Classic AR3030 Operating Manual page 6

AR3030 operating manual
One converter may be internally fitted to further extend the receive coverage of
the receiver. A separate 50 OHM BNC aerial socket is fitted to the rear case of
the AR3030 in order to simplify connection to a dedicated VHF aerial.
SSB (Single Side-Band) - who uses it?
SSB is a general term given to two additional modes of operation USB for
upper-side-band and LSB for lower-side-band. Generally speaking, SSB is
used by long range services such as oceanic airband, ship to shore and
Amateur band to increase the operational coverage of the radio transceivers.
Most point-to-point services use USB including Amateur band. By convention,
Radio Amateurs use LSB below 10MHz.
True carrier insertion is used for USB, LSB and CW with a separate SSB highly
selective filter being used for these modes. A BFO control (which operates in
CW, USB, LSB & FAX modes) has also been provided so that the CW note
may be optimised to suit individual preferences and to form a simple manual
form of passband tuning, particularly helpful on a crowded frequency.
The inclusion of SSB on the AR3030 adds a new dimension to the listening
potential of the receiver when compared to AM broadcast-only shortwave
receivers.
All Mode
As well as SSB, the AR3030 can receive all other popular modes: AM
(Amplitude Modulation) used mainly by broadcast stations and some other
services (such as VHF commercial airband with the optional VHF converter
fitted). Synchronous AM (double side band) used to combat fading on the
shortwave bands. NFM (Narrow band Frequency Modulation) little used on
the shortwave bands but found on the UK CB radio and 10m Amateur Bands.
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.
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
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