DRAKE R8B Owner's Manual download pdf (Page 26)

Scan Functions cont'd. 24

To program a 9 kHz step rate for overseas broadcast band

reception-

Press POWER to turn receiver off

Hold TIMER/STEP function button

Press POWER to turn receiver on

9 kHz step in broadcast band is now programmed. This

setting is saved even if power is removed from the re-

ceiver. To change back to 10 kHz, repeat above steps.

SCAN A - B

An A - B scan allows continuous tuning of frequencies

between two programmed limits. Table 4 charts the tun-

ing step size and and display resolution for all models. If

the selected scan range includes the AM broadcast

band, the receiver automatically switches to a 10 kHz step

size (9 kHz selectable) while in the AM broadcast band

range.

To perform an A - B scan, press

A - B

Result: A - B flashes and the frequency display changes to

show one of the current scan frequency endpoints. To

change this endpoint, enter a new frequency. To set the

second endpoint, press the or button. The

display now shows the other frequency endpoint. Enter a

new frequency, if desired. To review the endpoints, press

the

or buttons.

Select method: SEEK

SEEK

or TIME

TIME

or CARRIER

CARR

Result: SEEK, TIME, or CARR lights in status area.

Select desired mode, bandwidth (BW), antenna, etc.

Adjust squelch to quiet receiver audio.

Press

SCAN

;

SCAN

EM SEE

flashes in status area when scan

is activated.

To adjust step rate: Press

STEP and step size will

change as per table 5.

Display will indicate scanned frequency. Scanning can

be stopped or restarted with repeated depressions of the

SCAN

button. When scan action is stopped, the receiver will

be in the VFO mode.

Scanning Resolution

(Hz)

Display Resolution

(Hz)

Mode

USB, LSB,

CW, RTTY,

AM, FM

Broadcast

Band

Default

Step 1

10K*

Step 2

100

Default

Step 1

Step 2

100

(*or 9kHz if programmed)

Table 5 Scan Tuning Rates

Important Notes About Scanning

To avoid impaired scanning action, it is recommended

not intermix HF with VHF channels, which imposes rapid

switching on the antenna select relay.

In all scanning modes the setting of the SQUELCH control

is important for proper scanning action. Due to atmos-

pheric noises alone, using a squelch control in the HF

spectrum is, at best, a compromise. A more exact method

of SQUELCH setting is provided here.

First, be sure the SQUELCH control is counterclockwise.

Next, adjust the RF gain control slowly counterclockwise

until the S METER reads the signal level desired to trip the

squelch circuit. For example, if you want only signals S-

7 or stronger to break the SQUELCH, rotate the RF GAIN

control until the S-METER is reading S-7. Next, leaving the

RF GAIN control alone, advance the SQUELCH control

clockwise until the receiver audio just quiets. Finally,

advance the RF GAIN fully clockwise. The receiver is now

ready for accurate scanning.

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DRAKE R8B Owner's Manual Page 26

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