www.SteamPoweredRadio.Com
0.
PACIFIC
RECORDERS
&
ENGINEERING
CORPORATION
-
---------+------------
I
THE
LSM-1O
LINE
SELECTOR
MODULE
FEATURES:
■
10
SELECTABLE STEREO
INPUTS
■
MAIN AND AUXILIARY
OUTPUTS
PLUS
3
RECORDING OUTPUTS
■
STEREO GAIN RANGE CONTROLS
■
SELECTABLE
INPUT/
OUTPUT METERING
■
SELECTABLE MONITORING OFMAIN OUTPUTAND 3 TAPE
RETURNS
■
INDEPENDENT MONITOR WITH LEVEL CONTROL
■
RECORD/PLAY-
BACK FEEDBACK LOCKOUT
T
he
LSM-10
Li
ne
Selector M
odule
allows production,
newsroom
and
recording personnel
to
selectanyof10
li
ne
-
l
eve
l signal sour
ces
(i
ncluding
thr
ee
t
ape
machines)
fo
r
mon
it
oring,
mete
ri
ng
and
recording. This ster
eo
unit
is
base
d
upon
a program amplifier
preceded
by
a source-
selector
swit<::h
, to which montoring
and
metering circuitry
has
been
added.
Th
e program
amp
l
ifier
output
is
routedto
a se
ri
esofconnectors
on
t
he
r
ear
of
theuni
t:
a
ma
in output,
an
auxiliary
ou
tput
and
a
se
t of
ou
tpu
ts
to
three
ta
pe
recorders. T
he
sour
ce
-selectorswitch
is
con
fi
guredso th
at
whena t
ape
machine is selected
as
the source,the output
line to t
hat
tape
reco
r
der
is
int
errupted,
pr
eventing
the
possibility
of
f
eed
b
ack
. The program
amp
li
fie
r
has
a
front-
panel
ga
in
-t
rim
contro
l.
T
he
mon
it
oring ampli
fi
er,
wi
th h
eadphone
-driving
capa
-
b
ility,
allows mon
it
or
ing
of
the
output of
any
of
t
he
t
hree
t
ape
machines
oroft
he
program
amplifier, all
indepe
n-
den
t
of
the sour
ce
-selector switch. T
he
monitoring
ampli
fi
er
gain
is adjust
able
wi
th a front-
panel
level
con
t-
ro
l.
It
s
outpu
t
appears
at
the
front-
pane
l
head
-
phone
jackwhich
is
normalled-throu
gh
to a rear-
pane
l
connec
-
tor,
fo
r possible
app
li
cation to
an
ex
t
ernal
power
amp
lifi
er.
T
he
VU
m
ete
rs
are
driven
by
buffer
amp
lifi
ers
and
qre
fr
ont-
panel
switch
ab
le to a
ll
ow level
measurement
/
of
eitherthe selectedsource or the program amplifier output.
LS-4
·
an:d
LS-10
LINE
SWITCHERS
LS-4
LS-10
Also
available
are
two
passive
switching systems. The LS-4
is
a
set
of
four 4-input by ]-outputstereo switches. T
he
inputs
are
all isolated; a total
of
sixteen inputs
can
be
accommodated. The
LS
-
10
is
a pair
of
JO
-input by ]-output stereo switches.
Th
e inputs are connected
in
parallel on the LS-10.
LSM-10 Functional Block Diagrmn
MET
ER
INPUT
OUTPUT
INPUT1
$2
$7
'----
~
AUX.
OU
T.
SB
A
TAPEINPUT1
o--
-
--+-O
-----------
-------
-
-------~
S8B TAPEOUT 1
TAP
EIN
PUT2
o-------+--o
S9A S9B
- -
--
- - - - -
--<>+--+0----
--
- -
----0
TAPE OUT 2
S10A
TAP
EI
NPUT3
o-----+--+-o
S1
0B
- - - -
----
-+--o+-.C>--------
--'--
---o
TAPEO
U
T3
INTERLOC
KS
IMO
NI
TO
R I
OUTPUT NOTES:
1.
Left
C
hann
el
on
ly
is
show
~
TAPE1
2.~Cont
r
ol
TAPE2 3.
Po
wer
supply
not
shown
TA
PE
3
'------o
MONITOR OUT.
4.
Wilen
a
Tape
Input
is
cho
S8f\
t
l'e
corres
pon-
ding
T
ape
Out
put
lin
e
is
opened
• -- ---'-
______
L_S_
M-
_ l_0_TE_ C_
HNI
_ C_AL
__
SP
_E_C_
IFI
_ C_A_
TI
_O_N_S_·
_______
----/
Nominal Input
Signal
Levels
:
Ga
in Adjustment &
Range
:
Source
Impedance
:
·'input
Impedance
:
Common-mode
Rejection:
Output Level:
+ 4
to
+ 8
dBu;
see
notes
- 2 to + 24
dB
600
ohms or les
s,
ba
l
anced
or
unbalanced
Program amplifier: 50K ohms line-to-
line,
balanced,
instrumentationinput
amplifiers
Monitor Amplifier:
as
above
Metering Amplifier: 60K ohms
Program Amplifier: better
than
50
dB
,
20
Hz
to 20
kHz
(60
dB
typical)
Monitor Amplifier: better
tha
n
40
dB,
20
Hz
to 20
kHz
(55
dB
typical)
Program
Amplifier:
+ 8 dBu nominal;
clip point
is
+ 29 dBm into 600 ohm
load
Monitor
Amplifier:
+ 8 dBu nominal;
clip point
is
+
21
d~hm
load /
Output Source
Impedance
:
Output
Load
Impedance
:
Frequency
Response
:
Signal to
Noise
Ratio:
Harmonic Distortion:
Intermodulation Distortion:
Crosstalk:
Power Requirements:
Size: 19" wide, 3.5"
hi
gh, 10''
deep
Weight: 10
pounds
; 20
pounds
domestic
shipping
~1
003,
Pacific Recorders & Engineering Corporation
I. These specifications
are
subject to
change
without prior notice.
Program Amplifier: Less
than
100
ohms,
balanced,
floating, transformer-
coupled
Monitor Amplifier: Less
than
40
ohms
unbalanced
600 ohms or
greater
+0, -0.6
dB,
20
Hz
to 20
kHz
Better
than
90
dB with + 8 dBu test
tone, 20
Hz
to
30
kHz
bandwid
th
Program Amplifier: better than 0.01%
at + 29 dBm into 600 ohm load,
1
kHz
; better than 0.03% at + 29 dBm
into 600 ohm load, 50
Hz
to
20
kHz
;
Monitor
Amplifier:
less than 0.01%
at +
21
dBm into 600 ohm load,
20
1-lz
to 20
kHz
Less than 0.005%, + 8
to
+ 29 dBm
in
to 600 ohm load,
SMPTE
(60/7000
Hz)
Better
than
85
dB,
20
Hz
to 20 kHz
120 VAC,
50/60
Hz
,
10
watts
2.
0 dBu corresponds to
an
amplitude
of
0.775 V
RMS
regardless
of
impedance.
It
is
the
same
as
0 dBm
if
the
i
mpedance
of
the circuit
under
discussion
is
600ohms
.
It
may
be
consklered
0 dBm (enabling convenient
measurement
with meters
calibrated
for
a
600
ohm circu
it)
if
the
circuit
impedance
is
simply
disregarded.
3. The program amplifier
and
me
tering amplifiers in the LSM-IO
have
ad
justable gain,
enabling
operations on either
+4
dBu
or
+ 8 dBu systems.
