Ameco PT Petunjuk Manual
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AMECO
PREAMPLIFIER
MODEL
PT
The
AMEC0
Model PT
Preamplifier
is
a
unit that
may
be added
to
most
existing
trans-
ceivers
in
the
frequency range
ot l.B to
54
MHzf
improving
the
gain,
noise
ftgure,
spurious signal
and
image
rejection
of
the receiver section. This
All-New
pf
ImgCO
Preamplifier
has
been
designed
-oecifically for
use
with a transceiver.
The
sophis-
ticated control circuitry incorpoi '-t
permits the
PT
to
be added
to virtually
any
transceiver without modiflcation.
Ttre
fundamental requirement
is that
the
transceiver
have
control circuitry built in for
use
with a
!'1near
ampl
if ier.
This
I
inear
ampl
if
ier
control circuitry is
used
to
bypass
the preamplifier
during transmit
mode
or to
control
the
I
inear
ampl
ifier dlrect!y.
When
the
transceiver
I
inear
ampl
ifier
control
ci
rcuitry
actuates
the relay
in
the
PT,
additional contacts
in
ifr.-pf
-"ontiol
the
linear
so
that
loss
of linear amplifier facility
does
not result.
The
PT
consists
of a
tuned
RF
amplifier,
covering
all
the
amateur bands
from
150
throuqh
5
meterc
sndi in oiiili,-::,, lll
..i:.
l;.ig,:
,Ioadcasts, as
wel
i
as
otlrgr
services
within this
frequency range.
The
Mo"del PT
employs
a
low noise frame
grid
tdbei
pro-
viding a
noise
figure of
1.5
to'3.5
db, over the frequency
range
of i.B to
S4'nnz.
The PT
Preampl
if ier
wi
ll
be found especial
ly
ef
fective wiir, tr,or"
transceivers
em-
ploying the
Pl
output
network
of
the transmitter section as the receiver
RF stage
input.
Most
transceivers
of this
type begin
to suffer
a
noticeable decrease
in
sensi-
tivity
on
l5
meters and
especiatly on 10.
The
PT
will
be most
beneficial
on
these
bands
and
the
inclusion
of
6
meters
makes
it
r.rsable
with
those
second
receivers
having
a
6-meter
range
or with
the
newer
6-meter
single-sideblna
tnansceivers.
ln addition,
the output
of
the
frame
grid
RF
amplifier seition
feeds
an
isolation
net-
work
with
two
outputs.
One
output
is
used
to
feed
the transceiver input
when
re-
ceiving,
while
a
second
output
is
used
to
feed
a
second
receiver,
which
may
be
of
the
general
coverage
or
amateur-band-only
type.
The
built.-in
relay
of
the
pT
also
includes
a set of
contacts
with
three terminals
brought
out to tfie reai of
the cabinet so that
either
normally-open
or
normally-closed receiver
mutinglmay ne employea
in
the
sec-
ond
receiver,
whenever
the transceiver
transmits.
The PT
is
designed
specifical
ly for
I
I7-vol
t
60-cycle operation.
The
input
and
output
impedances
are nominally
50
ohms
to
match most
popular types of
amateur
installations.
The
input
and
output
impedances
of
the
pT
are not
critical
and'
therefore
no adjustments
or
modifications are
necessary
with other
impedances.
The
AMECO
PT
is truly
a great step forward
in
increasing
the
flexibility of a
trans-
ggiver
equipped amateur
station.
The use
ofra
second
reieiver with its
extremely
Ax-rble
operating
characteristics
will
be
greatly
appreciated by the
contest,
DX,
?y-Brffiious.operator,.both
with
cw
and
single
sideband. once
the operator
has
A
DIVISION
OF
AEFTOTRON,
INC
RALEIGH, N.C
INSTRUCTIONS
ustomed
to a typical
setup using
a transceiver,
together
with a pr
and
a
$v"r,
he
will
wonder how he
ever got along
wiihout it.