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GENERAL  DESCRIPTION

This  transceiver  is  an  advanced  AM/FM

 

2-way  radio  designed primarily  for mobile

 

operation. 

It  employs  the  very  latest

 

technology  to  provide  80  channels  of

 

operation  by  means  of  digital  frequency

 

synthesis  with  Phase  Lock  Loop  (PLL)

 

circuitry. 

The  use  of  PLL  circuitry  as­

sures  a  précisé  on-frequency  operation  on

 

every  channel  in  both AM and  FM modes

 

that is unmatched by  conventional crystal

 

frequency  synthesis.
This  transceiver  also  includes  many  fea-

 

tures  which  will provide greater operating

 

convenience  and  assure  optimum  com­

munications  under  a  wide  range  of

 

conditions.  Other features are:
•   80 channels  operation
•   AM  —  FM  mode  switch  for easy  sélec­

tion  of operating mode.

•   Illuminated  meter  indicates  “S”  units

and  RF power  output.

•   LED  digital  channel read-out.
•   Switchable  Noise  Blanker  +  ANL  for

 

effective réduction  of noise.

•   Transmit  (Tx)  indicator lights.
•   Variable  Squelch  control.
•   RF 

Gain 

control/push-pull 

band

 

switch  (Hi-Lo).

•   Built-in  ceramic  filter  helps  prevent

 

adjacent channel interférence.

•   Built-in  automatic  modulation  control

 

circuit.

•   Provision 

for  PA  operation  with

 

volume  control.

•   External  speaker jack.
•   Convenient  Sélective  Call  input  jack.
•   Floating  chassis  for  either  negative  or

 

positive ground mobile operation.

•   Push-to-Talk  dynamie  mic  with  coiled

 

cord.

TECHNICAL  SPECIFICATIONS

GENERAL

Circuitry:

Digital  Phase  Lock

 

Loop  Synthesizer.

Channels:

80  channels.

Mode  of Operation:

AM,  FM.

Power  Source:

13,8V  DC  [nega­

tive  or positive

 

ground]  .

RECEIVER  SECTION

Circuit Type:

Dual  conversion

 

superheterodyne

 

with  RF  stage  and

 

455  kHz  ceramic-

 

filter.

Sensitivity:

0.7 juV for  10  dB

 

S/N.

Selectivity:

45  dB  down at

 

±10 kHz.

Image  Rejection:

40  dB.

Spurious Rejection:

50 dB.

AGC  Range  [for  10  dB

level  change]  : 

70  dB.

Squelch  Range:

0.7 

m

V  to  500 

m

V.

IF  Frequency:

Ist  IF:  10.695  MHz

 

2nd  IF:  455  kHz

Audio  Output Power: 3  watts  into 

“ EXT. 

SP” jack  [at 

ohms]  .

Current Drain:

300 mA on stand-

 

by  [no 

signal]  .

TRANSMITTER  SECTION

RF Power  Output:

Up  to 4  watts  at

 

13.8V DC.

Emission:

6A  3/6F3

Harmonie  and  Spurious 

Suppression: 

40 dB.

2

Содержание M580

Страница 1: ...INSTRUCTION MANUAL...

Страница 2: ...ontrol push pull band switch Hi Lo Built in ceramic filter helps prevent adjacent channel interf rence Built in automatic modulation control circuit Provision for PA operation with volume control Exte...

Страница 3: ...ONE JACK 4 Pin socket for push to talk micro phone supplied 2 RF GAIN HI LO BAND SWITCH RF Gain This control should normally be set to maximum fully clockwise If a storong station blast in and sound d...

Страница 4: ...ckwise position past click the transceiver is converted into PA Public Address mode 5 CHANNEL SELECTOR SWITCH Rotary switch selects one of 40 channels for both the high band and low band Channels 1 th...

Страница 5: ...cable RG 58 U or RG 8 U with matching PL 259 type coaxial connector MOBILE INSTALLATION TRANSCEIVER MOUNTING Before installing the transceiver in a car truck boat etc be sure to choose a location whic...

Страница 6: ...e greatly determined by the efficiency of the antenna system used Due to the complexity of the subject it is not within the scope of this manua to OPERATION INSTRUCTIONS Make sure the transceiver is p...

Страница 7: ...to talk bar on the microphone The TX In dicator Light 6 will corne on as you depress the push to talk bar Hold the microphone 3 to 4 inches from the mouth and slightly to one side so that the voice d...

Страница 8: ...5 65 27 695 6 27 025 26 27 265 46 27 475 66 27 715 7 27 035 27 27 275 47 27 485 67 27 725 8 27 055 28 27 285 48 27 505 68 27 735 9 27 065 29 27 295 49 27 515 69 27 745 10 27 075 30 27 305 50 27 525 70...

Страница 9: ...SCHEMATIC FRONT PANEL...

Страница 10: ...MAJOR ACOUSTICS CORPORATION XX4A12...

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