Standard Horizon HX400 User manual

.....................

SERVICE

MANUAL

LFB00089134

0001

LFB00089134/1

CONTENTS

TH:~OR¥

OP~RAT~O~

........

41.1

41.2

4,1.3

4,114

41~:i

411~

4,1

The

Rese~

C~-cu~t

..............................................................................................

Extemm

sgna~

connections

and

fnterf~a:~ng

PT"[

and

Fro~

Par)e!

B,ut~o~

..................................................

c~a~~b~et

C}rcu~t

....................................................................................................

Secondary

[}~g:~la~

A~na~ogue

coavmser

........................................................

4,2

Lo~

~::ilter.

4,2.2

Th~:~

Trans~fl~

VCO

4,.2.3

~he

~ce~w

VCO

4,24

The

Trarmmib’Rece~e

VCQ

z;,.~

VCO

Buff:er

.Am~lifi:ers

..............................................................................................

4.3,

R~[.

;EwEA

SECRON

.............................................................................................................

A~~te~’~

L~>,~

>aSS

~}~ter

..........................................................................................

4.3,5

Second

Fil~er

..............................................................................................

4.3

MrX~:~;~

C#cu.~t

~}{sl

!~~

Rmp

Second

Circ:u~it

~Oemodula~or

Second

}[~

F:~ter

4.3.10

bt~te

(~Jr,;~#~

...................................................................................................

4~3~11

Audio

Proces:~r

Circuit

4=&12

Sc~a.mb~ed

4.3,13

Mu~e

~nd

442

Trs~nsm:~

4.4.3

Tr~nsm£

Au~fio

~x)oess~n9

Circu~

...........................................................................

4,4.4

~ra~’~s:rY~

4,4.5.

VCO

cbcu~

44.6

Lo~v

Po~er

4,~6.1

Bstteq,~

¢on~ec.t~:ons

and

Protect~o~

Pag÷

2of

LFB00089134

0002

LFB00089134/2

5.,

~ISASSE.~SLY

...............................

~..3.

M(]VI

I;;.

~3K3;~©

~SPI..~sY

BO,o%;R

..................................................................

1~5

HX420

VHF

R/{o:lo

PAr~

L~s’r

.............................................................

72.

4XSS0

UHF

RADIO

PA£rS

~.,~;t

..............

72,1

Audio£Xsp~a~

Board

..............................................................................................

?.2.2

Mahs

Board

........................................................

~r~r~

~oohma~

aot

d~e~e&

PARTS

9,1

HX420

V~4F

RADIO

~iCU~T

Db~s£S~A~’~

................................

HX480

UHF

I"<,/,@~O

CiRCUFr

[)~AGRAM

...........................................................

10.1

ItX420

VHF

RAOIO

COMPO~N¢:NT

IL,~YO~J:TS

.............................................................

10,

HX420

VH;F

Control

rSi

Top

~ts

Compone~1~

¢oul

...............................

H£4,20

VH~::

Cont~’o/Board~

Botto~l

PaRs

!0,t,3

HX4,20

VHF

Board

Top

Parts

Cosspdnent

10,

~qX420

VH~

Board

Bottom

Par~s

Com#o~e~t

Layou~

.................................

:,!7

10.2.1

Hx480

UHF

Oon~ro~

:Board

Too

Pa~ts

CamE~onsnt

LaTout

.......................

2~3,

HX480

UH:F

Board

Top

Psr~s

C0ntDonen~

f0.2A

HX42~0

[..~H~F

Board

Bo~o~}

Pads

Coms~nent

FIGURES

F~gL~re

4,24

Syntt~es~zer

B!gc,

Diagram

.........................................................

F~gure

4~3..I

Rece~ve~

B~ock

D~agram

.......................................................................

F~gu.re

4,4-~

Tra~sm~te~

B~ock

Di~sgram

.........................................................

LFB00089134

0003

LFB00089134/3

lhe

ENTBL

HX400

series

PMR

haadh@d

twa~way

VHF.iLJ~NF

~ransceival.

Ultra

camsact

s~ze

and

deanna,

:~s

made

o~a

heew

du~.

commercial

canstr(4c~ed

with

m~c~’ep~{scesso~

con~relled

temperatu~-e

compensal:ed

Pha

LocKed

Loop(PLL}

croquette},

s~nt~es~zet

Th~s

#me~

the

capabllbCy

256

progra;mmable

channels.

CTCSS

DCS

Most

t:be

receP~m9

pa~s

are

swi~cbed

off

ee-riod~ca~y

p~’war

save

node

red~ce

ba~e9

carre~t

d~ak~

dudng

slandby.

The

t~ansce~ve~

includes

¢he

fo4158wM9

p~og

~ammab~e

2/5

tone

sel~ca~

Lo:ne

WL~rke.r

Stun

sad

Unsttm

Feature

B.u~!

b4n

Scrar

~b~ef

M~ssed

call

faci~tV

Emer~eacy

Call

feature

VOX

[~o-lce

operated

transmit

with

auto

easy~to-read

LCD

The

batte~

uses

L:lth~um-~on

te,ohno~ogy,,

which

g~ves

~sour

d{.£y

Oyc~e

The

Ba~e~

system

slse

has

batteH

leve~

me%ajar,

low

baUScH

wara~ng

~b~eep.

The

t~ansCeive~"

aiso

~as=

e×tensive

range

accessories;

2:1,

!~e

....................................................................................................................

m°P~:

°~e!

..............

?~’~T’T"

~T":

’i=~:~=’=!

,..

~:{~2~!.!

...............

......

Radie

~:,

HT420

(VHF)Or

Antenn~

.............................................................

!~O0mAh

~0n

ba~ter~

~.~Hng

Leaded

Rear

Cii~,

LFB00089134

0004

LFB00089134/4

The

blX40O

.Series

suppoded

wide

raoge

of’

~seful’

access,er~es

For

,up

date

~st

visit

our

web

site

at’.

www,enleLco.,uk

LFB00089134

0005

LFB00089134/5

describe

the

circuit

®pe.~’atio~

,el

~he

~adie;

tae

desc~iptiel~

!~a.s

been

The

Sy~hesizer

section

The

~eceiver

section.

~he

ma~n

rn~croprocesss.ro

has

seve~el

a:r~eilla@’

eompo,nea~s,

which

assist

operation.

Th÷y

ate

~esc=.ribed

the

following..}

sec~}ons.

t’his

(U805)

holds

(he

remai~sing

pa4

,~he

soRwa~’~s

for

the

Mio~oprecessor.

The

ROM

communicates

w~tls

the

Micro~’ocesso~

~sir~9

4.!~2.

The

L~D

Drive

Three

L.[ID’s

are

driven

the

dig~ta

outputs

from

the

Mic:roprecesso~

One

drives

the

Red

EE©,

one

ddves

the

Green~

LeD

and

o~se

drwes

the

b~:~c~k~i!~ht

[.,.ED’s

conr~ected

The

cro<>roces~.or

requires

reset

¢ircu.it

for

correct

~ower

operatio~

’RI~s

~rovided

LFB00089134

0006

LFB00089134/6

The

PTT

button

(8W608.)is

iqterfasoed

to,Be

Microprocessor

di~’ectl~,

via

U801

80,

A!!

o~ber

buttons

ose:nste

~h~ough

resistance

vakse

aath

switchers9

systam.

Th~s

ope~’ates

b~,

measu:nng

the

vo~t;~ge

po~a~

whe~e

the

volb~ge

eeper~dant

which

switch

~sct~va~(ed,

Th~

~de~t~fies

which

the

various

sw~tches

are

achvated

qh~

sw~ch.es

are

8W801

8W8.07

:n~c:~us~ve.

an:d

8W80~

LFB00089134

0007

LFB00089134/7

The

s~nttses~.ze¢

spe~a{®s

ims.lementi~sg

tae

p[~Ise

swallowing

reel:had,

using

the,

btoc~k

diagram

~iv÷n

i,n

:gure

4;2,q

below.

mod:t~lat~os

the

Refe~-ence

Osc~a~gi-’

(TCXO},

"Cb~s

permits

modulation

requwe

extreme

low

frequency

medL~at~on

the

VOO

The

I,oop

fi~ter

takes

ihe

variabie

p#!Se

w:idth

ou~pu¢

from

the

Phase

Page8

LFBO0089134

0008

LFB00089134/8

The

tfansmi~

VCO

w~tn

c~mpone~l(s

art}uF~d

Q405

[ak.es

~t]~e

~oop

:Nter

output

the

~s~ain

#equenc~

cont~ol

~n~ut,

but

aBo

has

b~7o

other

frequenc~

con~rc

~~od[s

These

are

~he

Speech

(MOD

AU~3~O)~nPuL

arid

the

MOD

TONE

a~alo

}npuL

These

tater

~np8~s

con¢re:

the

freqLae~soy

the

VCO

c~’~amg~g

the,

voRage

across

common

vat,cap

~Siode

D403

The

ma~n

~reqqe~cy

aput

controls

the

frequency

the

VCO

changu:ng

the

voltage

across

vancap

d’4odes

D404

~nd

[3405

The

MO©...oTONE

signal

also

conr~ected

}he

Reference.

Osciita£or

(TCXO}~

provide

the

c~oss

point

modu~a~o~

capability.

Refe~

~o=

the

l:rsns~’~~it

Sect@~

~or

fl.idher

deta~ils.

The

Receh~e

VCO

The

rececve

VCO

takes

the

same

=.ooo

~}.ter

output,

.....

the

ors:y,

frequ~ncy.

contro

in~u~

a~d

cor~trols

Ihe

~req~ency

t~.e

VCO

cna~~g~g

th~

Voltage

across

var~ca~

@ode

:netwOrR

O48!.

an~8

D402

~he

,7CO

operates

u~s~ag

t~ans~:stor

Q4O

The

TransmWRecei~ve

VCO

3~er

Swi~chin9

CirC[,.~@l

sets

oower

the

Transmit

VCO

dudr~g

Transmit

an~

the

Rec~ve

VCO

durir~g

rece~v~.

The

ir@~l-~

th~s

ci~rcwt

the

TX/RX

IoMc

contR)~

~l~i~e.

Th~s

~(~g~c

s~al

swKches

Q406

~rov~d@

power

ether

~he

VCO’s

s~o~nd

Q402

asd

Q4O&

LFB00089134

0009

LFB00089134/9

F~g~8

4,3-1

Receiver

Block

D.iag~am

4.S.1.

A~te~na

}Low

pass

Receiyed

si!~na{s

fr:o~’

pass

t£w.ough

[he

co~snector

(CON201}

a~d

are

passed

the

an{e~na

switching

c~rcu~

4.3..2o

Ar~;e#~a

Tra~smidReceive

switc~i#~

c~x;~it,

Th~s

Transm~b’Rece#/e

sw~tc~:

co¢-~tro~ed

~he

TXEN_SV

s~9na~

recerwng

d~Od,e

D202

D205.

are

~umed

off.

which

isolates

the

antenna

from

the~ra~smcter

c~-c~J

"’

.......

sw:~ched

wh~c~

gro~)ds

ou~

the

Rec@ve

:}r~ou~,

.a~d

connects

t’n:e

F~rst

R~F

F:llter

r~ext

stage

the

first

~itt:~r.

which

has

pass

ba~d

co~’~t~x~lled

.b~

~he

the

RDAC

~igna

:l"h~s

fiatet

al.~o

~a~

s@na~

~s~er

L~S~ng

Dt03

The

~qex[

:stage

the

first

R~~

,Amotifier

based

aroused

QI01_

The

©C

~,ower

for

i:h~s

stag¢~

~=.s

~’ovided

from

RX....SV

Page

0~8~

4’1

LFB00089134

0010

LFB00089134/10

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