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  9. Standard Horizon HX400 User manual

Standard Horizon HX400 User manual

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i
.....................
SERVICE
MANUAL
LFB00089134
0001
LFB00089134/1
CONTENTS
TH:~OR¥
OF
OP~RAT~O~
........
41.1
41.2
4,1.3
4,114
41~:i
411~
4,1
~7
The
Rese~
C~-cu~t
..............................................................................................
Extemm
sgna~
connections
and
fnterf~a:~ng
PT"[
and
Fro~
Par)e!
B,ut~o~
..................................................
7
S
c~a~~b~et
C}rcu~t
....................................................................................................
Secondary
[}~g:~la~
to
A~na~ogue
coavmser
........................................................
7
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
4.
z;,.~
VCO
Buff:er
.Am~lifi:ers
..............................................................................................
9
4.3,
R~[.
;EwEA
SECRON
.............................................................................................................
I0
43
~
A~~te~’~
L~>,~
>aSS
~}~ter
..........................................................................................
10
4.3,5
Second
RF
Fil~er
..............................................................................................
11
4.3
5
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~
...........................................................................
13
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
4i
LFB00089134
0002
LFB00089134/2
5.,
~ISASSE.~SLY
...............................
~..3.
R
E
M(]VI
N
G
TH
I;;.
A
U
~3K3;~©
~SPI..~sY
BO,o%;R
D
..................................................................
1~5
T,
I.
HX420
VHF
R/{o:lo
PAr~
L~s’r
.............................................................
1~
72.
4XSS0
UHF
RADIO
PA£rS
~.,~;t
..............
24
72,1
Audio£Xsp~a~
Board
..............................................................................................
24
?.2.2
Mahs
Board
........................................................
~r~r~
~oohma~
aot
d~e~e&
PARTS
9,1
HX420
V~4F
RADIO
C
~iCU~T
Db~s£S~A~’~
................................
32
HX480
UHF
I"<,/,@~O
CiRCUFr
[)~AGRAM
...........................................................
33
10.1
ItX420
VHF
RAOIO
COMPO~N¢:NT
IL,~YO~J:TS
.............................................................
10,
I,
1
HX420
VH;F
Control
Bo
a
rSi
Top
Pa
~ts
Compone~1~
La
¢oul
...............................
34
t
0.
t
.2
H£4,20
VH~::
Cont~’o/Board~
Botto~l
PaRs
!0,t,3
HX4,20
VHF
RF
Board
Top
Parts
Cosspdnent
10,
~
,4
~qX420
VH~
RF
Board
Bottom
Par~s
Com#o~e~t
Layou~
.................................
:,!7
10.2.1
Hx480
UHF
Oon~ro~
:Board
Too
Pa~ts
CamE~onsnt
LaTout
.......................
38
I0
2~3,
HX480
UH:F
RF
Board
Top
Psr~s
C0ntDonen~
f0.2A
HX42~0
[..~H~F
RF
Board
Bo~o~}
Pads
Coms~nent
FIGURES
F~gL~re
4,24
Syntt~es~zer
B!gc,
k
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
is
~
PMR
haadh@d
twa~way
VHF.iLJ~NF
~ransceival.
el
Ultra
camsact
s~ze
and
deanna,
~t
:~s
made
o~a
heew
du~.
commercial
It
is
canstr(4c~ed
with
a
m~c~’ep~{scesso~
con~relled
temperatu~-e
compensal:ed
Pha
se
LocKed
Loop(PLL}
croquette},
s~nt~es~zet
Th~s
#me~
the
capabllbCy
of
256
PC
progra;mmable
channels.
CTCSS
&
DCS
Most
e[
t:be
receP~m9
pa~s
are
swi~cbed
off
ee-riod~ca~y
m
~e
p~’war
save
node
to
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
a
1~
~sour
d{.£y
Oyc~e
The
Ba~e~
~
system
slse
has
a
batteH
leve~
me%ajar,
a
low
baUScH
wara~ng
~b~eep.
The
t~ansCeive~"
aiso
~as=
an
e×tensive
range
of
accessories;
2:1,
!~e
[~
....................................................................................................................
m°P~:
M
°~e!
..............
?~’~T’T"
~T":
’i=~:~=’=!
,..
~:{~2~!.!
~
...............
......
Radie
~:,
HT420
(VHF)Or
i
Antenn~
.............................................................
!~O0mAh
L~
~0n
ba~ter~
~.~Hng
Leaded
Rear
Cii~,
LFB00089134
0004
LFB00089134/4
The
blX40O
.Series
is
suppoded
by
s
wide
raoge
of’
~seful’
access,er~es
For
an
,up
to
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
2~
The
Sy~hesizer
section
3,
The
~eceiver
section.
~he
ma~n
rn~croprocesss.ro
has
seve~el
a:r~eilla@’
eompo,nea~s,
which
assist
it
in
~s
operation.
Th÷y
ate
~esc=.ribed
i~
the
following..}
sec~}ons.
t’his
c~
~
(U805)
holds
(he
remai~sing
pa4
of
,~he
soRwa~’~s
for
the
Mio~oprecessor.
The
ROM
communicates
w~tls
the
Micro~’ocesso~
by
~sir~9
~s
4.!~2.
The
L~D
Drive
Three
L.[ID’s
are
driven
by
3
of
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
t4
conr~ected
The
M
cro<>roces~.or
requires
a
reset
¢ircu.it
for
correct
~ower
up
operatio~
’RI~s
~s
~rovided
by
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
a
resistance
vakse
aath
switchers9
systam.
Th~s
ope~’ates
b~,
measu:nng
the
vo~t;~ge
on
a
po~a~
whe~e
the
volb~ge
~s
eeper~dant
which
switch
is
~sct~va~(ed,
Th~
~de~t~fies
which
o~
the
various
sw~tches
are
achvated
qh~
sw~ch.es
are
8W801
to
8W8.07
:n~c:~us~ve.
an:d
8W80~
LFB00089134
0007
LFB00089134/7
The
s~nttses~.ze¢
spe~a{®s
by
ims.lementi~sg
tae
p[~Ise
swallowing
reel:had,
using
the,
btoc~k
diagram
~iv÷n
i,n
F
:gure
4;2,q
below.
mod:t~lat~os
ol
the
Refe~-ence
Osc~a~gi-’
(TCXO},
"Cb~s
permits
modulation
at
requwe
an
extreme
y
low
frequency
medL~at~on
of
the
VOO
The
I,oop
fi~ter
takes
ihe
variabie
p#!Se
w:idth
ou~pu¢
from
the
Phase
Page8
of
4I
LFBO0089134
0008
LFB00089134/8
The
tfansmi~
VCO
w~tn
c~mpone~l(s
art}uF~d
Q405
[ak.es
~t]~e
~oop
:Nter
output
as
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
2
~np8~s
con¢re:
the
freqLae~soy
e~
the
VCO
by
c~’~amg~g
the,
voRage
across
a
common
vat,cap
~Siode
D403
The
ma~n
~reqqe~cy
aput
controls
the
frequency
of
the
VCO
by
changu:ng
the
voltage
across
a
vancap
d’4odes
D404
~nd
[3405
The
MO©...oTONE
signal
is
also
conr~ected
to
}he
Reference.
Osciita£or
(TCXO}~
to
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,
as
.....
the
ors:y,
frequ~ncy.
,.
~
contro
in~u~
a~d
cor~trols
Ihe
~req~ency
o~
t~.e
VCO
by
cna~~g~g
th~
Voltage
across
a
var~ca~
@ode
:netwOrR
O48!.
an~8
D402
T
~
"
,
.
~he
,7CO
operates
u~s~ag
t~ans~:stor
Q4O
1
The
TransmWRecei~ve
VCO
P
3~er
Swi~chin9
CirC[,.~@l
sets
oower
on
to
the
Transmit
VCO
dudr~g
Transmit
an~
the
Rec~ve
VCO
durir~g
rece~v~.
The
ir@~l-~
~o
th~s
ci~rcwt
~s
the
TX/RX
IoMc
contR)~
~l~i~e.
Th~s
~(~g~c
s~al
swKches
Q406
to
~rov~d@
power
~o
ether
oi
~he
2
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
to
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~:
is
co¢-~tro~ed
by
~he
TXEN_SV
s~9na~
m
recerwng
d~Od,e
D202
[o
D205.
are
~umed
off.
which
isolates
the
antenna
from
the~ra~smcter
c~-c~J
"
"’
.......
sw:~ched
oh
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
Is
the
first
RF
~itt:~r.
which
has
a,
pass
ba~d
co~’~t~x~lled
.b~
~he
the
RDAC
~igna
:l"h~s
fiatet
al.~o
~a~
a
s@na~
~s~er
L~S~ng
Dt03
The
~qex[
:stage
s
the
first
R~~
,Amotifier
based
aroused
QI01_
The
©C
~,ower
for
i:h~s
stag¢~
~=.s
f~
~’ovided
from
RX....SV
Page
i
0~8~
4’1
LFB00089134
0010
LFB00089134/10