Marti Electronics CLA-40A User manual
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CLA
-40A
CO
MP
RESSOR/LIMITER
AMPLIFIER
WARRANTY:
Except
as
otherwise provided in this secllon,
the
equipment deicrlbed herein is sold under the followlng
guarantee:
Marti
agrees
to
repair
or
replace
within o
one
(1)
year
period
ond
without
ch
arge
,
any
equ
ipment
or
parts
which
ore
defective
as
to workmanship
or
material
ond
which
are
returned to Marti
at
its factory,
transportation
prepaid
and
properly insured, provided:
(a) Notice
of
the
claim
ed
defect is given Marti within
one
(1)
year
from
dote
appearing
on
invoice
and
go
o
ds
a
re
returned in accordance with
Mart
i instructions.
(b) Equipment, accessories, tubes
and
ba
tteries not manufactured
by
Marti
are
subject to only such
ad
-
iustments
o,;
Marti
may
obtain from the supplier thereof.
(c) Equipment
or
acc
essories shall not
be
deemed
to
be
defective if,
oft
er
examination
by
Marti
or
its appointed representative, the equipment evidences
damage
from moisture, imp
roper
han
-
dling, installation
or
operation.
(d)
In
the
eve
nt
tha
t Marti is requir
ed
lo demonstrate equipment capability either
as
to
specifications
or
defects in ports or workmanship
and
where
ii
is found
that
the equipment meets specifications,
Marti shall be
en
titled
to
collect all
reasonable
expenses from the Buyer including but not
li
mited
to,
tra
vel,
per
diem living e
xp
enses
and
hourly
wage
rotes
wh
ich have
been
established
by
Marti
and
which are in effect
at
the time.
Marti furth
er
guarantees
that
any
radio transmitter described herein
will
de
li
ver specified
radio
frequency
power output
at
the
an
ten
na
leod when connected
to
a ,uitable load, but su
ch
guarantee
shall not
be
con-
strued
as
a
guarantee
of
any
definite
coverage
or
range
of
sa
id
apparatus.
The
guarante
e of these
para
-
graphs
is void if equipment is
alt
ered
or
repa
ired
by
others than Marti
or
its authorized service
Repr
e•
sentotive,
or
unless specifically authorized
In
writing
by
Mart
i.
No
o
ther
warranties, expressed or implied,
shall
be
applicable
to
any
equipment sold hereund
er,
and
the foregoing shall constitute the
Buy
er's
,ofe
right
and
remedy un
der
the agreements contained
In
this
paragraph
.
In
no event shall Marti have
any
liability for consequential damages,
or
for
loss,
damag
e
or
expense directly
or
In
directly arising from the
use of
the
products, or
any
inability
lo
use them either
separately
or
in combination with other equipment
or m
ater
ials, or from
any
other
ca
us
e.
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CLA
-
40
SPECIF
ICATIONS
Application
------------
-
---------
AM
or
FM
(Characteristics
Selectable
.)
Combines
both
compressio
n
and
limiting
functions.
S
ymmetrical
peak
limiting
for
FM,
selectable
asymmetrical
or
symmetrical
peak
limiting
for
AM
.
Peak
limiting
l
evel
adj
u
stab
le.
Input
and
Output
Impedances
------
600
o
hms
ba
la
n
ced
or
unba
l
anced
.
Input
Level--
---
-
---------
-
------
-15
to
+
20
DBM
Maximwn
Output
Level---
--
-
-------
+
20
DBM
RMS
Fr
e
quency
Response
--
-------------
50
Hz.
to
15
KHz
flat
withi
n 0 . 5
DB
in
AM
or
FM
mode~
Maximum
Gain
----
-
----------------
40
DB
Noise
Level
------------
----------
Minu
s
66
DB
Re
f . +
10
DBM
output
(FM
Mode)
Distortion
--------
-
--
- -
------
----
Less
than
1%
THD
(Normal
c
ompression
leve:;.s)
Compression
Ratio-------
---------
Better
than
10
:1
Automatic
Gain
Control
Range
---
- -
40
DB
D
yna
mic
Release
Time
------------------
-
--
Adjusta
ble
800
milliseconds
, 2
sec
. ,
5
sec.
approx
. C
LA-40A.
Attack
Time-
-
-------
-------------
L
ess
~han
l
microsecond
in
compress/
limit
mode
.
Met
er
ing-
--------------
- -
--
------
Gain
~ed~ct
i o
n,
output
level,
+4
VU
,
+10
VJ
_T•
AM
-
FM
Operation
----
---
--------
-
Both.
Stano
.
ard
75
microsecond
pre-
emphasis/de-
emp
hasis
used
in
FM
operation.
Shielding
and
RF
Filtering
----
---
For
use
in
high
RF
fields
.
Operati
ng
Temperature
------
-
----
-
-20°C
to
+50
°C
.
Physical
Dimensions
-----
---------
J½"
by
19"
rack
pan
e l
or
I/16th
of
7"
by
19"
rack
ho
us
ing.
Power
Re
quir
e
ment
----------------
120/240
volts
,
50
-
60
Hz.
,
10
watts
Weight-----
-------------
---------
6
pounds
.
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~ I
MODEL
:
CLA
-
40A
TEST
REPORT
SERIAL
NUMBER
/6 t./ I
FREQUENCY
RESPONSE
so
100
400
1
3
5
7. 5
10
1
2.5
15
AM
Hz
.
-.,'
0.
p9
DB
Hz
.
------o
.
-,--
Hz.
t O.
'~
KHz.
====O
·
=c====
KHz.
__
o
__,
.
tJ~:5..,__-
~~:
--ig
.....
•
-,...,..
D--
. ·~
KHz.
4o
L
---=-;,-
·"'>"17--
KHz
·_
_.,,,.4-
e)
.....
,:9.
-6--
KHz.--1-'
0-.
3&--
DISTORTION
(COMPRESS
ONLY)
AT+
10
DBM
b
l!/i
NOISE
RE:
+ 10
DBM
b:l..DB
COMPRESSION
RATIO
ABOVE
VU
-
1.
5
LIMIT
LEVEL
SET
DISTORTION
INTRODUCED
AT
7
DB
COMPRESSION
(400
Hz.)
so
100
400
1
3
5
7.5
10
12
.5
15
DAT
E
------
FM
Hz
.
i6·~
DB
Hz
.
- .
7'D
Hz.
,o.
C,
KHz.
~:
~~
KHz.
KHz.
-+-0
.
-5
Z>
KHz
.
~:~
KHz
.
KHz
.
"::f
v.
i:f'D
KHz.
:fD
,
JO
f)
I
13
%
I I •1
I
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~ I
TEST
REPORT
MODEL:
CLA-40A
SERIAL
NUMBER
DATE
FREQUENCY
RESPONSE
AM
FM
50 Hz.
o.
DB
50
Hz
.
o.
DB
100
Hz
.
0.
100
Hz
.
o.
400
Hz
.
0.
400 Hz.
0.
1
KHz
.
0.
1
KHz.
0.
3
KHz.
o. 3
KHz.
0.
5
KHz.
0.
5
KHz
.
o.
7.5
KHz
. o. 7. 5
KHz
.
0.
10
KH
z. o. 10
KHz
. o.
12. 5
KH
z. 12. 5
KHz.
15
KHz
. 15
KHz
.
DISTORTION
(COMPRESS
ONLY)
AT+
10
DBM
% %
NOISE
RE:
+ 10
DBM
DB
DB
COMPRESSION
RATIO
ABOVE
VU
-
LS
LIMIT
LEVEL
SET
DI
S
TORTIO
N
INTRODUCED
AT
7
DB
COMPRESSIO
N (400
Hz.)
% %
BY
:
-------------------
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I
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LA
-40
COMPRESSOR/LIMITER
AMPL
IFIER
I
INSTALLATION
&
OPERA
TING
INSTRUCTIONS
I
INSTALLATION
~
1. The
model
CLA-40H
unit
re
qu
ires
3-\
inches
of
s
tandard
rack
space
.
M
odel
CLA
-40V
unit
1.s
1/6
rack
sp
a
ce
wide
and
7"
hig
h
and
15 i nc
hes
deep
l
for
use
in
Marti
Type RS- 1
rac
k she
lf
.
2. J
'l
s!:a
ll
th
e
unit
so
tha
t
it
does
not
receive
excessive
heat
from
tube
typ
e
equip
ment
which
may
be
l
ocate
d
in
th
e same
rac
k. The
ambient
operating
l
ai.r
temperatu
r e s
hould
not
exceed
40°C
(104°F).
CAUTION:
DO
NOT
INSTALL
CLA
-
40A
UNI
TS
NEAR
POWER
TRANSFORMERS
OF
OTHER
EQUIPMENT
WHICH
CAN
I
NDUCE
NOISE
INTO
THE
AUDIO
CIRCUITS.
13.
Connect
the
600
o
hm
program
lin
e
to
termina
l s
1
and
2
of
TB
-
1.
Inpu
t
audio
lPvel
shou
ld
be b
etween
- 15
DBM
to
+20
DBM.
Co
nnect
transmitter
l
audi
o
input
to
terminals
4
and
5
of
TB-1. Th
is is
the
compressed
and
l
imited
output
of
the
unit,
and
the
l
eve
l
is
adjustable
up
to
+20 D
BM.
When
t
he
d
es
ir
ed
outpu
t
level
of
the
CLA-40
is
bel
ow
+4
DBM
,
it
is
advisable
to
operate
the
CLA-40
at
ap
proximate
l y +10
DBM
ou
tput
l
eve
l
and
insert
a 600
l
ohm
L~s
i
stive
pad
in
the
l
ine
to
obtain
th
e
desired
level.
Thi
s
wil
l
pro
-
vid
e th~ s
am
e
sig
nal
to
noise
ratio
as
is
o
btained
at
higher
levels
.
Un1cs
are
sh
ipped
connecte
d
for
120
volt«,
,o/60
Hz. o
peration
.
14
5.
Stereo
operation
Jl
of
the
units
with
l
ordered
for
s
ter
eo)
~
of
two
CLA
-40
units
is
obtained
by
interconnecting
a
short
length
of
RG-58
ca
bl
e(prov
id
ed when
units
AM
OPERATION:
1
1.
Set
contro
l s
initially
as
fol
lows:
I
I
Input
pad
- 0
DB
M
ode
Switch
-
AM
Li'Tlit
<:!
l
Switch
-
Sym.
(Svmmet
ri
cal
l
imiting)
M
eter
Swit
ch
-
Gain
R
eduction
Compre~s/
Limit
Switch
-Compress
Only
Output
L
eve
l - Maximum
counte
r -
clockwise
posi
tion
Input
Lev
el -
Maximum
cl
ockwise
posi~ion
Re
covery
Time -
Pos
ition
2 (CLA-40A
ONLY)
I
2.
With
normal
program
line
level
into
th
e
CL
A-
40,
adjust
inpu
t
pad
until
a
gain
reduction
rea
d
ing
between
~7
and
~20
VU
is
noted
on
the
meter
.
I
Ad
ju
s t
the
in
put
l
eve
l
potentiomete~
for
an
ave
r
age
gain
red
uc
tion
of
approximat~
l y - 7
VU
. T
he
exact
gain
redu
cti
on (comp~e
ssion)
setting
to
be
used
sh
ou
ld
be
deLermined
by
th
e
station
enginee~~
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I
lctA-40
COMPRFS
S
OR/LIMITER
AMPLIFIER
l
..M
OPERATION,
c.o
ntin
aed:
3.
The
modulation
level
of
the
AM
tra
r.smir
t~r
1s
adj
us
ted
wi
th
t he
out
p
ut
■
lev
el
potentiometer
whi
le
observing
the
station
m0dltlation
mo
ni
to
r.
T
hi
s
lllrurJ'u's
tment
is
made
wi
th
the
compress/lim
it
~
wit~h
;:,
the
compress
/ l
imit
po
sition
.
(This
switch
should
alwa
ys
be
ir.
t r_i s__pos
it
ion
when pr ogram
audio
l
is
modulatin
g the
transmitter.)
4.
Symmetri
cal
peak
limiting
will
be
obtained
i.
11
step
3
above
be
caus
e
of
th
e
in~t
ial
se
tting
s
ca
lled
for
i n s t ep
1.
If
a
syrmnetrical
pe
ak
limiting
l (H
ighe
r
µositive
peak
s
than
negative
peaks)
is
desired,
the
li
m
it
er
switc
h
can
be
se
t
to
"Asym
."
po
sition
.
It
is
now neces3a!."y
to
de
t
erm
in
e
th
e
correct
po
la
rity
(phasing)
bet ween
the
compressor/lirr.i
ter
a."1d
t r
ansmi
tt
er
au
di o
l
input
terminals.
Pr
oceed
as
follows:
Fe€d a
40V
Hz
. Lone
into
the
CLA-40
~
1,~l1
t.
tc1.,hl
:·
1.ls
at.
a
leve
l t o pr o
du
ce
1
-7
VU
gain
re
du
ction
on
the
mete
r
and
apprcxirnat.Ely
100%
mo
d
ula
t i on
of
th
e
tr
ansmi
tte
r.
Place
the
l
imiter
switch
in
"A
sym. " p::-.sitio
n.
Sel
ec
t
po
s
itive
peak
monit.
oring
on
the
star.ion
modulation
moni.Lo1.
Nace
rhe
mo
dulation
perce
nt.age..
Re
verse
the
audio
output
li
ne
at
t.e::ni.inais 4
and
5
of
TB
- 1
f
nd
again
observe
the
modulation
percenLage
.,
Sel
e:t
ncga
Li
ve
peak
mon
i
tor-
ing
at
the
s
ta
tion
modulation
monit.nr
and
adJust
ou
r
put
level
on
the
CLA-li.0
for
t
he
d1;sired
regative
modulatior.
;-12r.cf-:i~a.ge
1-:>etween
90 a
nd
1
00%
.
lr
he
(".on
diti
ons
e2tablished
ato·
✓
e
shouJ.d px.Jduce a
positi
ve
to
neg
ati
ve
pe
ak
m0d
ula
tion
Yati:>
of
approximate
ly
L
3.5
to
J.
(T":is
is
dependent
up
on
th
e
l
capabil1ty
of
th
e t~an3m1t
t.e!:'
in
pr.Jvidi.r
6 r.squi!'.'ed
peak
po
wer
. )
5. Ph
asing
0£
the
aud
...
o
input
to
the
C
lA-
l+O
i
·.,;
.3cc.ompli~
hed
as
f
oll
ows :
W
~th
the
cont::-nls
3ei:
as
in
(
4)
ab
ove,
reduce
"i;:~p;.:t. lev£.l "
unti
l no
ga
i n
te1dr.:.tiDn 1.s s
howr.
on
th~
m~.=te!'..
Set
modulat...i
..;r,
mor.
1
t0r
for
positive
peak
onitoting.
Wi
th
voice
p=ogram
aud
i
o,
note
rc3itive
peak
mo
dulation
le
ve
l .
R
eve-::-.sg
audio
input:
te_rrnina
l.
s 1
and
2 of
IB~l
and
ag.:1.in
no
t e
positive
lltn
odulation
levE:L
Select
u.:i:mination
ph.a
=n~g
th-at
p-\1d
-.i
ce~
greatest
■
p
os
itive
peak
mo
dulat
ion,
~ ·
In
cre
a
se
input
le
ve
l t o
the
d
esirej
ga.1.n
rectur:
tion
rea
d
ing
on
th
e
me
ter.
■
thi
s
c•.~rr.
plete
s
the
AM
adjus
tm
en
t
procedure.
FM
OPERATI
ON~
1
1.
Set
1
_on
t.--;;".>ls
ini
ti':ll
1y a.s
foll
cw.s
~
I
I
I
I
Input
P
ad~
O!:IB
M~Ge
Sw
i
tc
h -
fM
L
1m1ter
Switc.h
-Sym. (Syrr
an
e t
r-i.:a:
l.i..mi:in
6)
ME:ter
Switch
-G-!irl Re
du::tic
,P
Compress/Limit:
Swit..::h •
C-::mpre~<:-
Or:]\.
Outp~1t
Leve)
,
Mfixi.mum
cot..int€r-
_l
,,..'
:..kwi:'E
~()31..tion
Input
Level
-Ma
.:dmum
clo,.k-wi-.,E.
r,c•::.it1,'r
R<:::coverv
T1,12
-
Position
2
"rr:slL..i.,,r
l
-;
f C
LA
~
L.O
ls
precee
ded
.,
.
·tv
AGC
Amp.
·1
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cLA-40
COMPRESSOR/LIM
ITER
AMPLIFIER
~
OPERATION:
continued.
2~
W
ith
normal
program
lin
e
level
into
the
C
LA
-
40
input,
adjust
i
nput
pad
9Jn
til
a
gai
n
redu
c
tion
rea
din~
between
- 7
and
-20
VU
is
noted
on
the
meter.
• d
jus
L
the
input
l
eve
l
potentiometer
for
an
average
gain
reduction
of
approximately
- 7
VU
. The
exact
gain
reduction
(compression
setting
to
be
[
sed
s
hould
be
det
ermine
d
by
the
statioP
engineer
.
3. The
modulation
l
evel
of
the
FM
tran
smitter
is
adjuste
d
with
the
output
lev
el
potentiometer
while
observing
the
station
modulation
monitor
.
This
t
dju
s
tmenl
is
made
with
the
compr
ess
/limit
~witch
i n t
he
compress/
limit
osition.
(
This
s
wi
tc
h
should
always
be
in
this
position
when
program
audio
is
modulating
the
t
ransmit
t
er
.)
The
meter
swi
t
ch
can
be
placed
in
the
+10
i>
r +
6.
VU
position
to
monitor
th
e
ac
tual
audio
le,
·el
into
the
transmitter.
't.
When
operated
in
the
FM
MODE,
the
C
LA
-40
emp
loy
s a 75
microse
cond
•
re
-empha~i~
network
b
efore
co
mpression/limiting
and
a 75
microse
cond
e-emphasi
~
network
after
Lnmpression/
li
miting.
Thi3
provides
a
very
effec
-
ive
co
ntrol
of
total
transmitted
RF
bandwL1Lh
whi
l e
maintai
ning
the
highe
st
average
~oduiation
level
.
How
ever
,
this
FM
pre-emp
ha
si s c
haracter
-
l
stll
must
be
cons
id@red when
making
fre
q
uen~y
response
measurements
hrough
Lhe
CLA
-
40
unit.
S
TEREO
OPERATION;
~
nth
€
FM
Mn
de
two C
LA~40
unics
ca
n
be
inttr:
ccnrec.ted
by
a jumper
cable
of
jG-3U c.oax
between
n
of
each
unit,
Tu
t:
5
air
, ,..~~u.
ti
'"'n
ac.Lion
of
eac
h
nit
causes
a
c0r
r
~spond1ng
reducti
on
J
"l
the
cr'ier
1n
ord
P.r
to
preserve
hannPl
S
0
faration
.
I
IMI
r
r
NQ._
LEVEL
~
A
peak
l2m1t~n~
ci~cJ~t
is
provided
1n
~oth
AM
and
FM
rn~des
of
op
eration
.
'
he
Limi~ L
evel
Adju
st
pocent1omet2r
is
f1r,to~y
1
,l1u"
!ed
such
that
no
more
han
l
pe-:
cent
harmoriic dic:t-o:?:t1.on
is
int.:::~<1· 1 J.n
c
he
peak
limiti.]lg
roceo;;s.
This
adjustment
car..
be
set
t o
provi,j
e
.2
l
<i::=ge-::
or
s
maller
ra
tio
'
between
average
and
pe~k
modulation.
A
Fmall~~
ratio
will
necessa
rily
rcduc~
~n
in
crea~r:
~n
distorti0n,
whil
e a
1argey
~at:J
will
r
ed
uce
the
v-2r:tg~
modula
..
ic:-1
~~-;•el .
See
Limit
Le
vel
A.::J~st.ment
1n
the
Adju
s
tment
and
Te5t
Pr
ccedure
s~~tion.
I -
I
I
I
I
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I
I
LA-40
OMPRE
SSOR
/LIMITE
R
AMPLIFIER
ADJUSTMENT
AND
T
EST
PRO
C
EDURE
I
A-4
0
AGC
MODULE
AD
JUS
TMENT:
I. Rem
ove
the
CA
-
40
m
odu
le
fro
m
the
CLA
-
40
unit,
Remove
the
CA
-40
m
od
ule
ov
er.
Referring
to
the
f
igur
e
below,
initially
set
th
e
four
potentiometers
as
fo
llow
s :
R-20
fully
counter
- c
lo
ckw
ise,
R
l7
and
R
21
appro
xima
tely
mid-
ran
ge
, R2
fully
clockwise.
I
I
I
I
I
Co
mpr
ession
Threshol
d
R 2
Adj
~
VVR
Bias
Adjust
R
17
Meter
Cal.
R
21
F.
E.T.
Adj.
R
20
2,
Set
CL
A-4
0
controls
as
follo
ws~
Meter
Switch
to
+10
VU, Com
pr
ess
/Limit
w
itch
"to
comp
r
ess/limit
out
,
t:n
pu
t
Lever
Co:1trol
to
maxi
mum
cloc
kwise
osition
,
Out
put
Level
to
maxi
mum
cow:ter-clockwise
positi~n
, I
npu
t
Pad
t o
"0
11
DB,
AM-FM
Switch
to
AM
, SYM-A
SYM
S
wi
tch
to
SYM
p0.sitio::-i.
'
pply
a
400
Hz .
audio
signal
at
O
DBM
level
to
input
ter
m
inals.
Connect
a
00
ohm
load
resistor
to
outp~t
ter
mi
nals.
W
ith
CA-40
m
odule
remove
d
fro
m
the
unit
,
set
Outnut
L
e:
-.re
'
for
O
VU
on
the
me+0
..,.,
(+
JO
vu).
Re
-
inst
all
C
A-4
0
l
odule
and
tighten
hold-down
screws.
AdJ
~St
Rl7
fer
-6
VU
on
t
he
meter.
J.
Rem
ove
t
ne
400
Hz.
3ignal
fro
m
input
term
~Lals
and
place
Meter
S
wit
ch
l
:n
GaJn
Reduction
p
osition.
Adjc.st
"Mer.er
Cal.
11
pJ
ta:n:t
iometer
R21
for
a 0
U
reading
on
the
m
eter,
-
•
Applv
a
400
Hz .
signal
to
their.put
term
inals
at
a
-15
DBM l
eve
l.
With
eter
Switch
in
Gain
Reduction
p
osition~
Comp
~ess/Limit
S
wit
ch
in
"compre
ss
nly
1t
position~
adju~t
R2
at
the
threshold
of'
gl'i1.n
reduc
ti
on
as
indicated
by
a
slight
mo
ve
men-c
in
the
negative
direction
;:·rom 0
0"
VU
meter
pointer
1
os1t.1.on.
5.
In
cre
a
::::e
the
400
Hz
.
inpu't
signal
leve
l
unt
il
~5
VU
Gain
R
ed
uc
tion
is
I
ndicated
on
the
ni~ter,
S:!.owly
rotate
R
20
i n a
clock
w
ise
di:r-ectio
n
un
t i l
an
n
cre
a
se
in
meter
reading
(
positive
mov
em
ent
)
o:
appro
x
imately
¼
VU
is
o
bt
ained,
R
epeate
p=ccedure
if
necessary
.
Wh
en
properly
se
t,
the
m
eter
should
l
ea
d u-
3/1.J.
'\i-t.
J
under
tl~e
above
test
co~dit.:.on.
T.rds
co:r..cludes
C
A-40
adjust
-
ent,
R
eplace
cove=
a~d
screws.
I
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I
l
cLA-40
COMPRESSOR/LIMITER
AMPLIFI
ER
to
JUSTMENT
AND
TEST
PROCEDURE
,
contin
ued
FM
RESPONSE
ADJUSTMENT:
1
1.
Set
I
I
CLA-40
controls
as
follows:
Input
Pa
d
-ODB
Mode
Swit
ch
-
AM
L
imiter
Swi
tch
-
Sym
.
(Symmetrical
l
imi
ting)
Meter
Switch
-+10
VU
Compress/Limit
Switch
Input
L
eve
l -
Maximum
Output
Level
-
Set
to
of
400
-Compress
Limit
Out
c
lo
ckwise
positio
n
0
VU
indication
on
meter
with
an
input
signal
1
2.
Connect
an
audio
vo
ltm
eter
having
a
sensitivity
g
reater
than
-20
DBM
to
th
e out~ut
terminals
of
the
CLA
-40
unit
. Al
so
loa
d
th
e
output
with
a
Hz.
at
O
DBM
level
1600
ohm
res
istor
. Reduce
th
e
input
lev
el 15 DB
by
setti
ng
Input
Pad
Switch
to
ce
nt
er
position
.
Record
output
l
eve
l
on
the
au
d
io
voltmeter
with
t he
400 H
z.
s
ignal
applied
as
in
Step
1
above.
Set
input
sig
nal
at
15
KHz
at
~
ame
l e
vel.
Output
voltm
e
ter
s
hould
read
the
same
as
with
t
he
400 Hz. s
ig
-
•
.al
+
or
-0. 5
DB
.
3. P
os
ition
Mode
Switch
to
"FM"
and
note
out
p
ut
level.
Return
Mode
Sw
itch
■
to
"
AM
"
position
and
adjust
R22
for
the
same
reading
as
was
noted
in
"
FM'
'
an
ode.
Swit
ch
again
to
FM
to
check
that
the
two l
eve
ls
are
the
same.
R22
i s a
ttached
to
pin
s
1,
2
and
3
of
the
output
LA-40
amplifier
socket
, P3.
1-,
rMrT
LEVEL
ADJUSTMENT
:
I
Pos
ition
CLA
-
40
co
ntrols
as
follows:
Input
Pad
-ODB
Mode
Switch
-
AM
Limiter
Swit
ch -
SY
.
(Symmetrical)
Com
p
res
s
/Limit
Switch
-Compress
only
Inp
ut
Level -
Maximum
clo
c
kwis
e
po
sitio
n
r• C
on
n
ec
t a 400
Hz
.
signal
at
O
DBM
level
to
input
t
ermina
ls.
Connect
a
111
arm
oni
c d
is
tortion
meter
to
the
output
terminals
.
Also
load
the
CLA-40
o
utput
with
a 600
ohm
r es i s
tor
.
Set
input
level
for
- 7
VU
compressio
n.
Set
output
level
fo
r +10
DBM
level
.
13. U
nder
condition
s
specifi
ed
in
(2)
above,
meas
ure
the
CLA-40
distort
io
n
a t 400 Hz .
It
sho
uld
be
0. 15 50 0. 45
percent
total
harmonic
d
isto
rtion
.
■
Pla
ce
com
pr e
ss
/limit
swit
ch
in
compress/limit
position
and
adjust
Limit
~
pot e
nt
i
ometer
for
0. 9
percent
distortion
.
I
I
I
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I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
THEORY
OF
OPERATION
OF
THE
MARTI
CA
-
40
SOLID
STATE
COMPRESSOR/LIMITER
MODULE
The
Marti
CA
-4
0
compressor/limiter
unit
operates
on
the
variable
audio
attenuator
princip
l
e.
A
full
wave
audio
detector
provides
a
vo
ltag
e
proportional
to
audio
peak
level
which
controls
a
voltage
va
ria
ble
resistor
(VVR)
average
level
attenuator.
This
VVR
de-
vice
has
a
very
large
dynamic
operating
range,
adds
no
audio
dis
-
tortion
but
has
a
comparatively
slow
attack
time.
For
instantaneous
co
ntr
ol
of
short
rise
ti
me
audio
waveforms,
the
control
voltage
is
differentiated
and
applied
to
the
gate
of
a
field
effect
transistor.
This
d
ev
ice
is
connected
in
paralle
l
with
the
VVR,
and
serves
as
an
ex
t r
emely
fast
attenuator
,
uper
a
ti
ng
only
on
short
rise
time
waveforms,
thus
c
omplimenting
the
sl
ower
VVR
device.
The
re-
sult
is
a
compress
or
with
a
40
db
dynamic
.range
and
a
limiter
with
microseconds
attack
time.
AUDIO
IN
Ra
LA
20/
12
AMP
LIMITED
AUDIO
OUT
r
I
-~-----
VVR
--------
R2
7I
I
I
I
I
I
I
I
I
I
I
L
DIFF.
NET.
.......
--~coMP
.
LEVEL
DC
AMP
AMP/DE
T.
CA-40
MODULE
------
----
_J
www.SteamPoweredRadio.Com
,r - - - - - - - -,_,_,_- - - -·- - - -
INPUT
PAD
R.
F.
FILTER
LI
SW-I
INPUT
PAO
SW·I
POS
.
I.
0
DB
,__;;,,;,,;a...,.=:...1,.:S::..:T..:.R:.::;A~P
2.
1508
1·3 3.
30D8
2·4
2
40
I
1-4
I 2-s
Tl
METER
SWITCH
SW-15 POSITIONS
I.
8AIN
REDUCTION
2. +
10
VU
OUT
.
3. +
4VU
OUT.
MODE ~ -
SW
·2
POS. I 2
I.
AM
-,-
ca
2. F
B-1
MI
SW
-
15
::Z.
fl~fr
v
Ll
.
12.
v
Pl -
LA
-20
[:!
---1:
·2
•
sw-2
OWG
700
·
098
· I
MARTI
Gfeclronied.
-9-nc.
SW-3
POSITIONS
I. COMPRESS /
LIMIT
2.COMPRESS ONLY
3.
COMPRESS/
LIMIT
OUT
-
LA-
20
R24
STEREO
STRAP
LIMIT
LEVEL
ADJ.
OUTPUT
LEVEL
LIMITER
+I
'"
SW-4
POS.
115
I.
ASYM
.
2.
SYM
.
41
600A
,
,:louTPUT
TB·I
COMP
RESSOR
/
LIMITER
CLA
-
40
www.SteamPoweredRadio.Com
I
I
PART
LIST
MAIN
FRAME
CLA
-
40A
I
ITEM
Bl
I
Cl
C2
I
C3
C4
cs
Cfr·
I C71
C8
cg
...
I
c10,
Cll
Cl2
Cl3
I
Cl4
ClScr
Cl6
I
Cl7
Cl8
I Dl
D2
D3
I
D4
DS
D6
D7
I
D8
D9
I
Fl
Jl
I
Ll
L2
L3
I
Ml
I
I
I
I
PART
NO.
383-004
256-471
256
-4
71
226-010
215-682
256
-1
51
215
-1
03
235-254
215-
333
219-500
219-500
219-401
219-641
219-641
235-254
2
15-5
00
255-750
297-202
297-202
414-007
413
-19
3
413
-
193
410
-
914
410
-
914
412-494
412-
494
412-494
412-494
510-009
550-022
330
-0
04
330-
004
330-009
030-017
DESCRIPTION
Lamp,
14
volt
No
. 1813
or
No. 756
Capa
ci
tor,
470
PF
, l
KV,
10%
Capa
citor,
470
PF,
1
KV,
10%
Capa
ci
to
r,
1 UF,
100
V,
1
0%
Capacitor,
6800 PF,
33
V,
5%
Capacitor
, 150
PF,
1
KV,
10%
Capacitor,
10,0
00
PF,
33
V,
5%
::=
• o I
,Jr
Capacitor,
0
.25
UF, 200
V,
5%
Capacitor
,
33,000
PF, 33
V,
5%
Capacitor,
50 UF, 40 V
Capacitor,
50
UF
, 40 V
Capacitor,4
00
MF,
40
V
Capacitor,
640
MF,
25 V
Capacit
or
, 640
MF
. 25 V
Capacitor
,
0.25
UF, 200
V,
5%
Capacitor,
50
UF,
40
V
Capacitor,
75
PF
, 1
KV,
10%
Capacitor
,
.002
UF, 2
KV
Capacitor
,
,0
02
UF,
2
DV
Diode,
1N
4007,
0.
75
A,
1
KV,
PRV
Diode,
1N31
93,
lA,
200
PRV
Diod
e,
1N
3193,
lA,
200
PRV
Diode,
1
N4
148
Match
ed
with
DS
Diode,
1N4148
Match
ed
with
D4
Di
ode,
5579
Matched
with
D7, 8, 9
Diode,
5579
Matched
with
D6,8,9
Di
ode,
5579
Ma
tc
h
ed
with
D6,7,9
Diode,
44
79
Ma
tche
d
wit
h
D6,7,8
Fu
se,
3A
G,
3/4
Am
p (120V)
3/8
Amp
(240V)
Ja
ck,
S~ereo
Stra
p
Indu
c
tor,
100 uh ;
10
%
Indu
ct
or,
100
uh,
1
0%
Indu
ctor
. 5
MH,
1
0%
Meter
,
Special
VU
www.SteamPoweredRadio.Com
I
I
PARTS
LIST
CLA
~
40A
MAIN
FRAME
,continued
I
ITEM
PART
NO
.
Pl
550-059
I P2 550
-0
59
PJ
550-059
Rl 11+5-Sbl
I R2 1
45-390
RJ
ll.5-561
R4
145-431
I RS
lLi.
5
-4
31
R6
145-221
R7 105-821
I RB 105
-272
R9,..
105
-103
RIO
..
10
5-
682
Ril
...
:o:;-102
I Rl2 105- 562
R
l3
105- 472
Rll
,.
105~152
I R
lS
t.
i00-~
12
Rl6
,
]05-2
12
R17
~
100-263
I R
l8
115~820
RJ
g
105-561
R
20
105-821
R
21
105-562
I R
22
100-
501
R
l3
lOi
-202
R26
.,_
105
-
4}j
I
R2~
L0.5
- 335
R
26
105- 15(,
R2
7
10)-226
I
SW
l
.'130~018
SW2
SJ0-00
1
SW3 530-018
I
SW<+
530-001
sw, 530•01-8
SW6
530- 0J 8
I
Tl
320~019
T2
110~010
TJ 310-004
I TB-1
).L]
·
·0
'21
~'
00-100
I
700-098
I
I
DESCR[l=TI
0N
Connector,
PC 10
Circuit
C
onneccor
PC 10
Circuit
Connec~or.
FC
l J
Circuit
Re
sis
tcr,
~oO
"'
hrm,, %W 5%
R
esistor,
39
~t.~~, %W
5%
R
Esistc:
1 560
ohrn5
) %W5%
Resi
scc~J
~30
ohm~,¼
W
5%
R
esis':or,
-30
olmls,
t W
5%
R
esislor,
22J
ohms) t W
5%
Re
sisLor,
820
ch.ms
. ~ W
5%
R
eaistor,
2,
7
ohms.~
W5%
R
esistor$
lO K o
hms,\
W
5%
Re
sLstor,
o~~K ohm~,
►
z
W
5%
P
otentiomec
~~" tK )hms,
~
W
20%
R
es~st.or
, .5.?K
,)nrr1-::,
l;
W s
yo
R~
siscor,
~.7K
ohm5,;
W
5%
Resisto-:r..
l.5
K
oh.._'Tis,
\ W
5%
P
ot:.e1:
riomet
e:r . SK chms,
~
W
20%
R
2L-~to~
.
2.
"K ~hms, \ W 5%
Po
terl
t.
1.
omet
er
, 2SK ohms ,
~
W
20%
R .
Q•)
L..
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PARTS
LIST
I
I
LIMITER
AMPLIFIER
MO
D
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MO
D
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NO
. C
A-
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ITEM
I
Cl
C2
C3
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C4
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C6
C7
C8
C9
Cll
Cl2
Cl3
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D2
D4
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Q2
Q3
Q4
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R2
R3
R4
RS
R6
R7
R8
R9
RlO
Rll
Rl2
Rl3
R14
Rl6
Rl7
Rl8
Rl9
R20
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PART
NO.
219-080
..
219-080,
219-
080·
219-223•
235-254'
217-
104;
226-
020·
215-
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219-200•
219-121·
219-121·
219-200~
414-007
410-
914
410-
914
410-
110
422-925
425-306
450-001
425-255
105-106
100-522
105-222
105-470
105-182
105-682
105-272
105-272
105-
184
105-
184
115-820
105-473
105-156
105-150
105-821
105-501
105-272
105-682
100-522
DESCRIPTION
. 1,a
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\8
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40 V
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125
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125
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15 V
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PARTS
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LIMITER
AMPLIFIER
MODULE
MODEL
NO.
CA-40
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PART
NO.
DESCRIPTION
R21
100-522
R22
100-152
R23
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PARTS
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AMPLIFIER
MO
DU
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MODEL
NO.
LA
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C6
C7
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C9
ClO
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D2
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Q3
Q4
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R7
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N o.
219-200•
209-401,
256-301,
219-121·
255-470,
219-
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413-754
413-754
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423-39
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423-391
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450
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105-102 .
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105-184,
105-184 ,
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700-024
MAR
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ELECTRONIC
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BURNE,
TEXAS
D E S C R I P T I 0 N
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ame
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uit
LA-20
Module Meta l Assembly
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