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INSTRUCTION
SHEET
435-667
a GENERAL INSTRUMENTcompany
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DESCRIPTION
Models SMA-" are high-gain, duaJ-output, strip amwillers
designed for head-ends of master antenna or closed-.circuit
systems, distributing vhf television channels or f.m. sound.
Outstanding
features are high overload capability, excel-
lent frequency
stability,
and low power
consumption.
In addition, each amplifier has its own built-in d.c. power
supply with line cord and plug, working directly from a
117 V a.c. outlet. The input circuitry permits the use of
plug-in attenuation
pads Models PIP-" for reduction
of
the input signal level over a range of 15 dB in 3-dB steps,
in accordance with system requirements.
Bridged output
terminals allow interconnection
of amplillers directly or
through appropriate
mixing networks in order to derive
a common broadband
output.
Three F -659 cable con-
nectors are shipped with each unit.
The amplifiers are contained in perforated
housings for
good ventilation and are designed for vertical installation
side by side on a mounting plate Jerrold Model MP-7.
\
The mounting plate in turn is designed to accept addi-
tional units such as splitters and traps, and can be mounted
on a standard relay rack or installed in an equipment
cabinet.
Models SMA-" are the solid-state advance of the well-
known Jerrold PMA-" tube type series and can be used
not only in new systems but also for expanding or mod-
ernizing existing PMA-" systems, or replacement of indi-
vidual PMA-" units.
INSTALLATION
CN-174
1. Mounting:
Each SMA-" ampliller strip is mounted
with two #6 x 1/2 round-head,
self-tapping
screws
(shipped with the SMA-") on a mounting plate, Jer-
rold Model MP-7. Where a different arrangement
is
planne~<L-the "neeessary-mounting
hardware will have
to be procured separately.
Model MP-7 will accept eight ampliller strips side-by-
side and a number of accessory units. A typical lay-out
example is given in Fig. 2. Note that the recom-
mended installation method is to mount the strips in
two groups of non-adjacent
channels.
The strips in
each group can be jumpered directly; the outputs of
the
two groups
are then
combined
in a hybrid
mixing network such as Jerrold Model 1596A
to
.....
Fig. l-Typical
SMA.* Strip
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