Ramko Research PRIMUS P-8S/16M User manual

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OWNERS MANUAL
\
PRINIUS

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Dear PRIMUS
Owner
:
What
exactly
is PRIMUS? Well,
the
name
by itself is
simply
ancient
Greek
meaning
"first."
We all know
that
brand names
or
catchy
phrases seldom
portray
the
true
quality
and performance of a
product
or
service.
However, every
once
in a
while
this rule is
broken. The PRIMUS
series
of
audio
equipment
is
just
such an exception.
As
you will see
by
its
leading
edge
per-
formance, its
quality
workmanship
and
flexiblefunctionality, you have purchased
truly
the
"first"
and
finest
available.
Until recently,
the
PRIMUS
concept
simply was not possible. Certain crucial
components
just
had
not
been invented
yet.
Once
these
obstacles
were over-
come though, a
new
generation
of high
benefit
products
became
reality.
For
example: a
new
exclusive packaging
design
allows
instant
access
to
all
electronics
without
having
to
remove the
housing from
your
installation; a new
concept
in
construction
allowing
emphasis
to
be placed on high quality,
long life
components
instead of high
cost
labor
(3
year partsand
labor
warranty);
the
incorporation of
many
user
features
that in
the past were
not
economically
feasible;
and last,
but
certainly
of prime concern,
the
highest
performance
technically
possible.
The
product
itself is
only
part of
the
PRIMUS
story
. The rest lies in
our
high
stress placed on
customer
service, from
the moment the
order
is placed and
for
as
long as you own the unit.
Whether
it be
service
or
just
advice
there
is a toll free
number
and the
best
people
in the
business
at
your service.
Thank
you for
your
confidence
in us and
we
all
look
forward
to
serving you
in
the
future.
Sincerely,
~Id
i--
-;;_,--5}54
President
.1

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--
R
AMl<0
RESEARCH
PRIMUS
P-8S/16'1
PRIMUS
P-BS/
18M
DISTRIBUTION
AMPLIFIERS
Cop
yr
ight
198
3 - Ramko
Research,
Rancho
Cordova,
California
9:5670
All
right
s
reserved.
Reproduction
or
any
other
use
of
the
text,
drawings
or
other
information
contained
in
this
publication
without
the
prior
express,
written
permission
of
Ramko
Research
is
prohibited.
PRIMUS
is
a
trademark
of
Ramko
Research,
Rancho
Cordova,
California
95670
I
I
...
PRIMUS!
P-BS/16M
ORIGIN~L RELEASE
RAMK0
RESEARCH
Customer
Assistance
Group
1135:5-A
Folsom
Blvd.
Rancho
Cordova,
CA
95670
1-800-821-2:54:5:
(916)
63:5-3600
AUGUST
:5,
1983

www.SteamPoweredRadio.Com
RAMKO
RESEARCH
PRIMUS
P-BS/16M
..
,
ORIGINAL RELEASE
2
AUGUST~,
1983

www.SteamPoweredRadio.Com
~
"1lAMKO
RESEARCH
PRIMUS
P-BS/16M
THE
PRIMUS
P-BS/16M
AUDIO
DISTRIBUTION AMPLIFIER
The
PRIMUS
P-8S/16M
is
a
dual
one-by-eight
Audio
Distribution
Amplifier
designed
to
provide
broad
expansion
capabilities
for
either
monaural
or
stereo
audio/broadcast
systems.
Here
is
a
versatile
unit
which
can
be
used
either
as
an
eight-channel
stereo
DA,
a
dual
one-by-eight
mono
DA,
or
as
a
16-out
mono
DA,
and
can
drive
virtually
any
load
which
might
be
encountered,
even
8-ohm
headphones,
without
adversely
affecting
performance
in
any
way.
In
addition,
the
P-BS/16M
boasts
operating
specifications
that
surpass
even
the
most
demanding
requirements,
including
the
SMPTE
Time
Code.
Without
modification,
the
P8S/16M;
can
accept
a
single
stereo
pair
and
provide
up
to
eight
balanced
stereo
outputs;
can
ac
c
ept
two
separate
monaural
inputs
to
provide
eight
balanced
outputs
for
each
input;
or
can
accept
a
single
monaural
input,
and
by
paralleling
inputs
sixteen
balanced
outputs
Car
up
to
32
unbalanced
outputs)
·
can
be
accomplished.
The
P8S/16M
unit
may
be
ordered
with
individual
push-button-
selectable
output
metering
and
phones
monitor.
Also,
the
unit
comes
factory-equipped
with
screwdriver-adjustable
trimmers
(standard)
or
with
optional
front
panel
pots
and
knobs.
The
unit
is
packaged
in
a
single
case
which
may
be
used
either
as
a
tabletop/bracket
mount
unit
or
as
a
single
rackmount.
The
only
difference
between
these
units
is
the
front
panel
(faceplate).
The
PRIMUS
8S/16M
unit
is
available
in
four
basic
configurations.
These
configurations,
together
with
their
corresponding
equipment
part
numbers
are:
001-0249
~
The
basic
tabletop/bracket-mount
unit,
without
the
meter/phones
option
and
with
screwdriver-adjustable
front
panel
trimmers.
001-0249M
Incorporates
the
003-0250
meter/head-phones
option.
Screwdriver-adjustable
front
panel
trimmers.
001-0249P
-
The
basic
tabletop/bracket-mount
unit
but
with
front
panel
pots
and
knobs
replacing
the
screwdriver-adjustable
front
panel
trimmers
001-0249R1
-
The
basic
unit
(002-02491
equipped
with
a
single
rackmount
faceplate
panel
and
trimmers.
These
options
may
be
combined
to
form
4
other
composite
units;
the
001-0249PM,
the
001-0249PR1,
the
001-0249RlM,
and
the
001-0249PR1M.
Each
unit
has
dual-regulated
power
supplies
and
may
be
-operated
from
either
117VAC
or
234VAC
by
means
of
a
selector
switch
located
on
the
printed
circuit
board
inside
the
unit.
ORIGINAL RELEASE
3
AUGUST~,
1983

www.SteamPoweredRadio.Com
RAMKO
RESEARCH
Gain
PRIMUS
P-8S/16M
P-8S/16M
OPERATING
SPECIFICATIONS:
Selectable
to
+66dB.
Variable
from
-60dB
to
+14dB
standard
from
factory
Ba
lanced,
gain-selectable;
mic
level
thru
+26dBm.
Bridging
high
impedence
Balanced
600
ohm,
+25d8m
ma
x
out
.0
05%@
+8d8m
out
+O, -
ldB;
10Hz-
100
k
Hz
-,
Inputs
Outputs
Distortion
Response
Signal/Noise
-
87dB
reference
10Hz- 8
0k
Hz @
+BdBm
out.
-95dB
A
weighted
Size
Operating
Power
Requirements
FEATURES:
Tabletop/Bracket
mount
17''W
>:
2''H
>:
7-
1/
2
1
"D
Available
rac
l:
mount
·
19'
'W
x 1-
3/4
'
'H
x 7- 1/ 2 ' ' D
117VAC/2
30VAC,
50/60H
z
<I
nter
n
al
switch-
selectable
*
Slide-out
PCB
module
for
easy
ser
v
icing
-
no
need
to
remove
cabinet
from
installation
*
17
'
'W
x
2''H
Tabletop/bracket
or
19
''
W x
1-3
/
4''H
rackmoun
t
*
Only
minutes
required
for
ejsy
con
v
ersion
from
tabletop/
bra
ck
et
to
ra
ck
mount
*
Individual
and
isolated
balanced
outputs
*
Independent
,
dual-regulated
power
sup~lies
*
Optional
push-button-select
output
metering
and
phones
monitor
*
Meter
s
electable
for
VU
or
Peak
ballistics
*
Individual
recessed
front-panel
le
v
el
co
n
tr
o
ls
*
Pot/knob
option
*
Response
flat
to
100kHz
* 3
year
warranty
*****CAUTION*****
THE
8S
/
16M
UNIT
WILL
BE
SHIPPED
FROM
THE
FACTORY
WITH
THE
INPUT
POWER
SELECTOR SWITCH IN
THE
117VAC
POSITION
UNLESS OTHERWISE
SPECIFIE
D.
IF
THE
UNIT
IS
TD
BE
OPERATED
FROM
A 23
4VAC
POWER
SOURCE
THIS
SWITCH
MUST
BE
MOVED
TO
THE
PROPER
POSITION.
WHEN
INSTALLING
THE
UNIT
FOR
THE
FIRST
TIME
TO
A
23
4VAC
SOUR
C
E,
OR
WHEN
REINSTALLING THE UNIT,
IT
IS
RECOMMENDED
THAT
THE
SETTING
OF
THIS
SWITCH
BE
VERIFIED
TO
AVOID
POSSIBLE
DAMAGE
TD
THE
UNIT
WHICH
MIGHT
BE
CAUSED
BY
AN
OVER
-
VOLTAGE
CONDITION.
* * * * * * * * * * * * * *
0
INSTALLATION
All
of
the
system
interface
connectors,
the
AC
power
cord,
and
a
grounding
stud
are
located
on
the
rear
panel
(see
figure
1).
Connection
of
this
stud
to
an
external
earth-type
ground
i ~
recommended
to
assure
proper
operation
of
the
unit
and
ma
>:
imum
efficiency
of
the
noise
shielding.
..
,
ORIGINAL RELEASE
4
AUGUST
5,
1983

www.SteamPoweredRadio.Com
-
--,
RAMKO
RESEARCH
PRIMUS
P-BS/1611
AC
POWIII
CORD
OROU~NDIN:u::u;APS
~+,
-
l SHIELD
-
--
~--------
-----
··
·_•_··_
.
_~=~==~=~:=~
:~~
:~~
:~
-~~~===
~~~~~~~~~~~
~.
..
Jli-24
J4-24
J5-1
-
J4-1
FIGURE 1 -
REAR
PANEL
CONNECTORS
1.
WIRING
THE
INPUT
CONNECTORS
The
A
and
B
Input
connectors
are
wired
a•
shown
in
figure
1.
The
connectors
may
be
interconnected
in
parallel
to
permit
16
balanced
monaural
outputs
(32
unbalanced
monaural
outputs)
from•
single
monaural
input.
Inputs
may
be
operated
either
balanced
or
unbalanced.
BALANCED
SHIELD
(+)
(-)
UNBALANCED
SHIELD
(+)
GROUND
2.
WIRING
THE
AUDIO
OUTPUT
CONNECTORS
PIN
2
3
PRE881LOCK
TO
FRONT OF
To
install
wires
to
the
output
connector
(s),
(see
figure
2)
place
a
wire
across
the
bac
k
of
the
connec-
tor
terminal
to
be
wired
and
press
the
wire
firmly
into
both
of
the
terminal
clips
using
the
wiring
tool
<RAMKO
P/N
012
-0
59
3 1
included
in
the
8S/16M
installation
kit
(which
is
furnished
with
the
unit>.
Then
wrap
Q
LAROER
WIRING
TOOL~
CONNECTOR
IEAYU\LOOP
1:W
.,
a
service
loop
of
wire
back
across
the
terminal.
PAE88
WIRE
FIRMLY INTO
TERMINALS
FIGURE 2 -
CONNECTOR
WIRING
,,.
ORIGINAL RELEASE
5
AUGUST
:5,
1983

www.SteamPoweredRadio.Com
RAMKO
RESE
AR
CH PRIMUS
P-8S/16M
....
Three-,
six-,
nine
or
12-pin
connector
sockets
may
be
used
in
wiring
the
BS/18M
audio
output
connectors.
The
installatio
n
kit
is
made
up
of
four
12-pin
connectors
(RAMKO
P/N
009-0168)
which
are
wired
as
follows:
OUTPUT
(+)
(-)
SHIELD
1 2
7
~-
2 4 5 6
3 7 8 9
4
10
11
12
5
13
14 15
6
16
17 18
7
19
20
21
8
22
23
24
9
25
26
27
10
28 29
30
11
31
7~
·
-'L
.,..,.
.
_,.._,
12
34
35 36
13
37
38 39
14
40
41
42
15
43
44
45
16
46 47
48
The
output
connectors
may
be
wired
stereo
outputs
or
16
balanced
monaural
Stereo
applications,
the
output
pairs
foll
o
ws:
to
allow
eight
balanced
outputs.
In
wiring
for
should
be
connected
as
STEREO
PAIRS
OUTPUT
PIN
GROUPS
1
(L)
and
9CR>
2
2(L)
and
10(Rl
3
3(L)
and
11
(Rl
4
4(L)
and
12(Rl
5
5(L)
and
13(Rl
6
6(L)
and
14CR>
7
7(L)
and
15
<R>
8
8(L)
and
16
(R)
NOTE: Any
or
all
of
the
outputs
may
be
connected
in
either
balanced
or
unbalanced
configurations.
FOR
UNBALANCED
OUTPUTS:
1.
Using
the
POSITIVE
(+>
outputs,
only
the
POSITIVE
(+>
output
terminal
and
the
ground
terminal
are
used.
The
NEGA?IVE
(-)
output
terminal
is
left
unconnected
(free
floating)
(See
figure
3.)
2.
Using
the
NEGATIVE <->
outputs,
only
the
NEGATIVE
<->
output
terminal
and
the
ground
terminal
are
used.
The
POSITIVE
(+)
output
terminjl
is
left
unconnected
(fre&
floating).
These
outputs
will
be
180
degrees
out
of
phase
with
the
input
signal.
...
ORIGINAL RELEASE
6
AUGUST
5,
1983

www.SteamPoweredRadio.Com
v RAMKO RESEARCH
PRIMUS P-BS/16M
3. Both POSITIVE and NEGATIVE outputs may be utilized
simultaneously in the manner described above, which
provides a capacity of 32 unbalanced outputs - 16 in
phase and 16 out of phase with the input signal.
UNBALANCED -;-
UNBALANCED
~
FIGURE 3 - WIRING POSITIVE (+) UNBALANCED OUTPUTS <IN PHASE>
It is not necessary to remove the top cover of the unit case
to gain access to the PCB module and to the above described
components. To gain access to the interior of the unit, simply
remove two screws from the back panel and slide the module out of
the back of the case. ( See figure 4. >
When reinstalling the module into the case, exercise care to
assure that the front panel power indicator LED slides cleanly
into the opening on the front panel.
FIGURE 4 - REMOVING PCB MODULE FROM CASE
ORIGINAL RELEASE 7
AUGUST~, 1983

www.SteamPoweredRadio.Com
RAMKO
RESEARCH PRIMUS
P-BS/16M
....
,
USER
SELECTIONS
• I
Several
user
-
selectable
features
have
been
incorporated
into
the
8S/16M
un
i
t.
<See
figure
7
for
component
location.>
1.
Power
Source
Select
2 .
Input
Gain
Select
Switch
Change
of
Resistor
s
TABLE
1
Allows
sele
c
tion
of
power
source
of
117VAC
or
234VAC
Allows
for
matching
of
input
line
si
gnals
to
various
operating
levels
(Refer
to
table
1
for
resistan
ce v
al
u
es
for
specific
dBm
gains>
INPUT GAIN LEVEL SELECT
RE
SISTOR SELECTION GUIDE
To
produce
2
VRM
S o
utpu
t
<+BdBm>
with
the
le
v
el
controls
centered
,
us
e t
he
f
ol
l ow
in
g v
alues
for
gain
select
resi
s
to
r
s.
Output
is
ter
mi
nate
d i
nto
a 60
0-ohm
load
.
Refer
to
figure
5
for
resistor
s oc
ket
lo
c
atio
n l
sl.
<I n
put
le
ve
l
for
+BdBm
Ou
tput)
POT
S
TRIMMER
S
-3
8dBm - 52
dBm
)
.
-32dBm
-46dBm
-2
6dBm ( . 0 43
vl
-4
0
dBm
(.
0077v)
-20dBm
(.
0
77vl
- 34dBm
(.
01
3
7v)
-10dBm
(.249vl
-24dBm
(.043vl
OdBm
(.
774vl
-14dBm
(.
154v)
+
BdBm
(
1.94vl
-
6dBm
(.388vl
+14dBm (3
.BBvl
OdBm
C.774v)
MAX
GAIN
<Ctrl
ful
1 C
WI
+66dB
+60dB
+54dB
+48dB
+38dB
+28dB
+20dB
+14dB
RESISTOR
VALUE
24(1
ohms
510
ohms
n:
2K
6.8K
24
1<
100K
NOTES:
1.
With
no
gain
select
resistors,
and
CMR
adjusted,
the
input
signal
will
be
amplified
+14dB
(-6dBm
in
for
+BdBm
out
I
~,i
th
the
level
controls
at
the
full
clockwise
position.
2.
Common Mode
Rejection
(CMRl
trimmers
should
be
adjusted
for
miniJIIUm
each
time
gain
select
resistors
are
changed.
TO
ADJUST
COMMON
MODE
REJECTION
short
the
(+I
and
1-1
input
terminals
of
the
input
to
be
adjusted.
NeNt,
with
respe
c t t o
ground,
feed
a
100Hz
signal
<at
about
2
volts)
into
the
input.
Then,
while
monitoring
any
of
the
outputs
assoc
i
ated
with
that
input,
adjust
the
CMR
trimmer
IR2
or
r
R1
3 1
for
a
null
or
minimum
signal
out.
(Refer
to
figure
7
for
trimmer
location.I
.,..
ORIGINAL RELEASE 8
AUGUST
:5,
1983