AOR SDU5500 Manual page 13

6 6 6 6 6
Menu 6
PREV
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MAX
When "MAX" is selected, the maximum
height of traces are frozen on the
display. This will result in 'peaks'
where transmissions have taken place,
one side effect is that the baseline will
tend to build-up a 5 to 10dB solid bar
due to random background noise.
This is a useful facility to 'trap'
occasional transmissions over a long
time-scale and to check on band
allocation for transmission licence
issuers. Press MAX a second time to
restore a normal trace. A reverse
contrast "MAX" legend confirms selection.
AVR
When "AVR" is selected, the average height of traces are calculated and displayed on the
LCD. This causes the display to be a little sluggish at detecting transmissions when they
first appear but permits them to remain visible for longer when the transmission stops. The
effect is a 'wave' of activity, useful for assessing band activity in a relatively short period of
time. Once activated, the buffer size must be allocated between 2 and 32 frames inclusive.
A reverse legend "AVR" is displayed on the LCD to confirm operation. While the buffer is
loading, the number of frames is indicated until the programmed number has been sampled,
after this point the specified number of frames will be averaged on an on-going basis. Press
AVR a second time to restore a normal trace. A reverse contrast "AVR" legend confirms
selection.
NEXT
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7 7 7 7 7
Menu 7
PREV
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<<-
Moves the centre frequency down by
half the span. For example, if the span
is set to 10000 kHz (10 MHz), the centre
frequency will be lowered by 5000 kHz
(5 MHz)... so that a centre frequency of
123 MHz would become 118 MHz.
Not available in channel scope mode.
<-
Moves the centre frequency down one
channel step. i.e. if the receive
frequency is 125 MHz and step is
25 kHz, the centre frequency will move
down by 25 kHz to 124.975 MHz.
-> Moves the centre frequency up one
channel step. i.e. if the receive
frequency is 125.000 MHz and step is 25 kHz, the centre frequency will move up 25 kHz to
125.025 MHz.
->>
Moves the centre frequency upward by half the span. For example, if the span is set to
10000 kHz (10 MHz), the centre frequency will be increased by 5000 kHz (5 MHz)...
so that a centre frequency of 123 MHz would become 128 MHz. Not available in channel
scope mode.
NEXT Move to next menu
Section 3-2
13