DRAKE TR270 Manuel du propriétaire télécharger pdf (Page 27)

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

= direction when

is used

= direction when is used

= 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:

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DRAKE TR270 Manuel du propriétaire Page 27

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