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4-16 BW (Bandwidth) button: The BW button is used to activate the IF Bandwidth edit
mode. Bandwidth is continuously displayed in either Hz or kHz in the BW area of the
display window. The bandwidth menu contains a selection of 57 pre-programmed
bandwidth settings, ranging from 100 Hz to 16.0 kHz. Additional Fast Filters are also
provided at 0.2 to 4 kHz and below for enhanced digital-mode reception.
To change bandwidth, press the BW button. It will illuminate and assign the Edit Knob to
the bandwidth menu:
A. Set Bandwidth via the Edit Knob: Rotate the Edit Knob to scroll through the
bandwidth selections. When scrolling, the receiver's bandwidth will actively change
with each new menu selection. Pressing a different Auxiliary Parameters switch will
disengage the Edit Knob from the bandwidth menu and exit the bandwidth edit mode.
The displayed bandwidth will remain selected until a new choice is made.
B. Set Bandwidth Via Keypad: Enter the desired bandwidth (in Hz) via the keypad.
The receiver's main frequency display will blank and the keypad entry will appear. Next,
press the BW button to complete the edit operation. Your selection (or the nearest
standard bandwidth above it) will transfer to the Auxiliary Parameters display window.
Also, the filter will become activated and the main display will restore to the receiver's
operating frequency.
C. Set Fast Filters: An alternate set of Fast Filters may be selected for bandwidths of
0.2-4 kHz. Fast Filters offer reduced signal latency and degraded shape factors to
facilitate reception of delay-critical HF-digital modes such as SITOR and QPSK. To
activate the Fast Filter Menu, first activate the BW function and enter a bandwidth of 0.2-
4 kHz. Then, press BW a second time. The letter 'F' will appear in the BW window in
front of the bandwidth to indicate that the fast filter is in place:
4-6
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