Function For Receive; I Simple Band Scope; I Preamp And Attenuator - Icom IC-703 Instruction Manual

Hf/50 mhz all mode transceiver

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Table Of Contents

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101

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104

105

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109

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111

112

Table of Contents

I Simple band scope

This function allows you to visually "sweep" an area

surrounding the set frequency for other signals. De-

tected signals are indicated graphically in the dot ma-

trix section of the display.

NOTE:

Use the attenuator or turn OFF the preamp

when using the band scope on a band containing a lot

of noise.

q Set a mode and frequency.

w Select

• Push [DISPLAY] once or twice to select .

• Push [MENU] one or more times to select

e Push [F-1] one or more times to select the desired

steps.

• Each dot corresponds to a step for the indicated fre-

quency.

• 0.5k, 1k, 2k, 5k, 10k, 20k and 0.1M (100 kHz) can be

set for the scope step.

r Push [F-3] to start the sweep.

• "

" (below

) ﬂashes while sweeping.

• The receive audio is muted while sweeping.

t Rotate the main dial if you want to monitor the dis-

played signals.

• The sweep marker indicates the location of the dis-

played frequency in the sweep readout.

• If the displayed frequency is outside of the sweep read-

out (determined by the sweep width), the sweep marker

ﬂashes.

y Push [F-2] to return the frequency to the start of a

sweep.

• The sweep marker moves back to the center position.

I Preamp and attenuator

The preamp amplifies received signals in the front

end circuit to improve the S/N ratio and sensitivity.

Turn this function ON when receiving weak signals.

The attenuator prevents desired signals from distort-

ing when very strong signals are near the desired fre-

quency or when very strong electric fields, such as

from broadcasting stations, are near your location.

Push [P.AMP/ATT] momentarily to turn the preamp ON

and OFF; push for 1 sec. to turn the attenuator ON.

• Lights green when the preamp is ON; lights red when

the 20 dB attenuator is ON.

• Only one of these functions can be activated at a time.

P.AMP/ATT

Lights green while the preamp is activated;

lights red while the attenuator is activated.