Delta 403 Specifications download pdf (Page 8)

Excluding option boards, the basic radio mounted in a

cast aluminum frame. The two boards are the transmitter-

receiver-system (TRS) board 19D9901620G1 and the

power amplifier board (see Figure 1). The TRS board is

connected to chassis ground allowing it to be used in

vehicles with a negative ground battery system only. Op-

tion boards include the Channel Guard board and VG

Interface board. The VG Interface board is used in radios

equipped with Voice Guard.

FREQUENCY SYNTHESIZER

The frequency synthesizer consists of a microcom-

puter, electrically erasable PROM(S) (EEPROM), a fre-

quency synthesizer IC, transmit and receive VCO’s and

associated circuitry. The frequency synthesizer under con-

trol of the microcomputer generates all transmit and re-

ceive RF frequencies.

EEPROM

The EEPROM stores binary data for all RF frequen-

cies, Channel Guard tones/digital codes, and the timing

function of the Carrier Control Timer (CCT). The micro-

computer accesses the EEPROMS and provides the correct

WALSH bits to the Channel Guard board to generate the

correct Channel Guard tone or digital code on a per channel

basis.

PROGRAMMING

The EEPROM allows the radio to be reprogrammed as

needed to adapt to changing system requirements. RF fre-

quencies, Channel Guard tones and digital codes, and the

CCT function can be reprogrammed.

Depending on the configuration of the radio, one or

two EEPROMs may be provided. Radios not equipped with

a MODE A/B switch will have one EEPROM. Radios with

more than 16 channels and those with the MODE switch

will have two EEPROMs.

The EEPROMs can be reprogrammed through the

radio front connector using the General Electric Universal

PROM Programmer Model TQ2310. This programmer al-

lows all information to be loaded simultaneously.

Alternatively, a single channel Programmer Model

4EX22A10 allows the user to reprogram the radio on a per

channel basis. This programmer requires the removal of the

radio top cover and any option boards present. A special

programming jack, J711, is provided in the radio for inter-

connections.

Programming instructions are provided in the respec-

tive Programmer Maintenance Manuals.

TRANSMITTER

The transmitter consists of the exciter, frequency syn-

thesizer, TX VCO, and a power amplifier assembly. The

PA assembly consists of a PA board mounted along the side

of the radio next to the heat sink assembly. The PA board

also contains a hermetically sealed antenna relay and a low

pass filter.

RECEIVER

The receiver consists of the frequency synthesizer, RX

VCO, injection amplifiers, front end, IF and limiter detec-

tor. In UHS receivers, a pre-amplifier board is added in the

receiver front end. Audio and squelch circuitry for the

receiver is located in the system section of the TRS board.

Jacks for the Channel Guard and other structured options

are also located in the system area.

CONTROL UNITS

Several "S" series control units are available for use

with the DELTA-S radio combinations.

The S-500 control unit contains an on-off volume

control switch, a rotary channel selector switch for 1, 8, or

16 channels, a MODE A/B switch (optional) to expand the

channel select capability to 32, seven segment channel

indicator(s), a red transmit indicator, channel busy indica-

tor (optional), and an external tone option jack. Options

that may be used with this control unit include Type 90 and

99 tone, squelch operated relay SOR, GE-STAR encoder,

and public address.

The S-600 control unit contains an on-off volume

control switch, squelch disable switch, red transmit indica-

tor, and a seven segment channel indicator. A rotary chan-

nel select switch permits selection of up to eight channels.

A white power-on indicator is used for back lighting the

front panel. Space is provided for two optional push-button

switches and two optional indicators.

The S-900 series control units designed specifically

for the DELTA class radios are highly versatile, software

NOTE

When programming, remember that all RF frequen-

cies must be divisible by 12.5 kHz.

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Delta 403 Specifications Page 8

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