Delta 403 Specifications download pdf (Page 9)

controlled units providing numerous functions and options

including:

• Dual Priority Scan

• Digital Volume Control

• Digital Squelch Control

• Type 90 or 99 Encode Tones

• GE-STAR Identification

• 128 Channels in -

8 Modes of 16 Channels each

4 Modes of 32 Channels each

• Carrier Control Timer (per mode basis)*

• Channel Guard - Tone or Digital*

• Channel Frequencies*

• Home Channel Revert

• Auxiliary Relay Control

* These features are actually performed in the radio.

If you have downloaded, the data is stored in the

control unit.

CHANNEL SELECTION

Depending on the control unit used, a single rotary or

push-button selector switch will select up to 16 channels.

In radios equipped with more than 16 channels, the control

unit contains a MODE A/B switch. The MODE switch

allows the user to select a second set of 16 channels

(17-32).

The MODE A/B switch may be used to provide mo-

bile-to-mobile communications through an intermediate

repeater (repeated path) or direct mobile-to-mobile com-

munications. For example, channel 1 Mode A may be

programmed for the repeater frequency (repeated path)

while channel 1 Mode B would be programmed for the

mobile receive frequency (direct path). Judicious program-

ming will allow selection of repeated or direct communi-

cations paths on selected channels.

MICROPHONE AND HANDSET

A hand-held microphone with a built-in, transistorized

microphone pre-amplifier is available for use with the

radio. The microphone is housed in a sturdy two-piece

case, and the extendable coiled cord plugs into the micro-

phone jack at the back of the control unit. The plug is

secured to the jack by a retaining screw.

An optional telephone-type handset is available for

use with the radio. The handset uses a dynamic microphone

with a built in microphone pre-amplifier. The extendable

coiled cord plugs into the microphone jack on the back of

the control unit, and is secured to the jack by a retaining

screw.

HOOKSWITCHES

In Channel Guard or other tone applications, a micro-

phone or handset hookswitch is supplied with the radio.

The hookswitches are equipped with a Channel Guard

disable switch.

Placing the switch in the "up" position (towards the

small speaker symbol) disables the Channel Guard de-

coder. With the switch in the "down" position, the Channel

Guard is disabled when the microphone or handset is

removed from the hookswitch.

SPEAKER

A three by five-inch speaker contained in a molded

plastic housing provides an audio output of 12 watts with

a speaker impedance of four ohms. The speaker leads are

terminated in Vehicle Systems Plug P3 which connects to

J1-A on the rear of the control unit.

INITIAL ADJUSTMENT

After the radio has been installed (as described in the

Installation Manual), the following adjustments should be

made by a certified electronics technician.

TRANSMITTER ADJUSTMENT

The transmitter adjustments include measuring the

forward and reflected power and optimizing the antenna

length, then setting the transmitter to rated power output.

Next, measuring the frequency and modulation and record-

ing these measurements for future reference. For the com-

plete transmitter adjustment, refer to the Alignment

Procedure in the service section of this manual.

RECEIVER ADJUSTMENT

The initial adjustment for the receiver includes tuning

the input circuit to match the antenna. Refer to the Front

End Alignment Procedures in the service section of this

manual.

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Delta 403 Specifications Page 9

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