Specifications

112
(15) Band scope
The AR8200 is equipped with a flexible band scope function which is capable of graphically displaying
band activity. The maximum frequency span width is 10 MHz, you may zoom in on activity to a span
width of 100 kHz. Centre frequency is displayed and a marker may be manipulated to ascertain the
frequency of activity using the graphical display. One trace may be saved to memory for recall at a later
time and may be overwritten at will. The trace may also be saved and loaded from the optional EM8200
external memory slot card.
&Note: Priority operation is disabled when the band scope is in operation. Audio is muted.
The optional RU8200 is inoperative when the band scope is in operation.
It is suggested that the band scope facility is ‘experimented with’ on a constantly active band such as
VHF Band-II broadcast.
15-1 Starting the band scope
To start the band scope . The frequency span width will be set to 10 MHz with the last
frequency displayed in 2VFO, search, scan or memory read mode being used as the centre frequency.
AUDIO IS MUTED.
The centre frequency is displayed in the top left of the LCD, one pixel will be missing from the centre of
the graphical base line indicating centre frequency position.
A progress cursor which comprises of a single pixel on the graphical base line travels from left to right
updating the band scope display… this confirms that the band scope is IN OPERATION (especially
useful when a trace is simply being updated or no signals have been located).
The frequency span width is displayed in the upper right corner of the LCD, at default this is 10 MHz.
The frequency marker legend “MKR” is displayed on the second line of the LCD, the marker is also
represented graphically by an upturned triangle (initially placed above-centre of the graphical trace).
When first activated, the centre and marker frequencies are the same (but may be altered).
The graphical trace is built-up from left to right. If no transmissions are encountered the display will
simply form a horizontal line around two pixels in height. When activity is located, vertical lines are
produced on the LCD, the stronger the signal the higher the line.
&Important: To monitor the transmission of the marker frequency and hold the
key. The progress of the scope is halted when the key is held. Squelch setting
has no effect on the band scope trace.
Section 15, 15-1