DRAKE TR270, Owner'S Manual, Page: 27 / 59

22 Scan Functions
The TR270 is capable of several different methods and
modes of scanning frequencies.
Both Receiver ‘A’ and Receiver ‘B’ provide the follow-
ing:
Scan Mode: Either VFO or Memory
Scan Method:
SEEK (0) - Stop scan at first detected carrier and exit the
scan mode.
CARRIER (1) - Stop scan at a detected carrier, then
resume scan 5 seconds after carrier drops.
TIME (2) - Stop scan at a detected carrier, wait 5
seconds, and then resume scan.
RESUME (3) - Stop scan at a detected carrier, then
resume scan immediately after carrier drops.
Additionally, the subaudible tone squelch may be
enabled for either receiver. Either a VFO or Memory
scan may be initiated for each receiver.
A mode and a method are programmed together.
Before performing any scan functions,
please read NOTE 1 and NOTE 2.
NOTE 1:
First, it is important to understand how SCAN Range
works. Example A refers to two types of VFO scan and
Example B refers to two types of Memory scan.
Example A: VFO SCAN
1) Programmed (in SETUP) START frequency limit is lower
than the programmed STOP frequency limit:
Example B: MEMORY SCAN
1) Programmed (in SETUP) START memory channel number
limit is lower than the programmed STOP memory channel
number limit:
START
limit
(frequency)
SCAN COVERAGE
(EXCLUDED COVERAGE)
STOP limit START limit
JUMP
2) Programmed (in SETUP) START frequency limit is higher
than the programmed STOP frequency limit:
Receiver
coverage
End limit
Receiver
coverage
End limit
- OR -
JUMP
START limit
(MEM number)
STOP limit
(MEM number)
(EXCLUDED COVERAGE)
Receiver
coverage
End limit Receiver
coverage
End limit
2) Programmed (in SETUP) START memory channel number
limit is higher than the programmed STOP memory channel
number limit:
- OR -
SCAN COVERAGE
START
limit
STOP
limit
STOP
limit
(frequency)
= direction when is used
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= direction when is used
Direction control during scan: Direction control during scan:
= direction when is used
= direction when is used
= direction when is used
= direction when is used
Direction control during scan:
Direction control during scan: