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-
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C;1je~:~:c,~~
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ai-:Se.
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LPE
C'LS'\'='~111er
Ser\'i:e
i:::..iTi::"cldL"eiy
IC:~lrl~i)"=(;llC:ll
ird"~:-::~".c"i.ic..n
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;:"IL!
shcy~ld
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ioe
·.i,:he:J
:z,iiing
0;'
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1:'1C~JJeS,
n~c)df!
il;,.E:lbe~'
ser~zj
j-ll.L1J~!ei·.
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fi'e~u::~!c~\
2l-J"j
8~ll':"
,::)f
pl.l:"cllaSe,
TbJS
1Il~'oL~rl3~10:1
Is
found
011
rile
]denlitlc2~jon
13~ej
,~r;
L~le
T;-ans;"11i7~e:'
This
equipment,
in
general
IS ?\OT
CSER
SERVICEABLE.
If
a
m~.lfuDction
arises
or
is
suspected,
\ve
urge
~ou
to r-eturn
the
equipment
to
the
factor~'
for
proper
repair.
If
the
need
for
service
arises
contact
LPB's
Customer
Service
Department
for
a
Material
Retum
Authorization
(l\:IRA)
and
shipping
instructions
before
shipment.
The
l\1R--'\.
number
must
appear
OIl
the
shipping
label.
LPB
Communications,
Inc.
Phone
856-365-8585 Fax
856-365-8999
3.0
APPLICABLE
FCC
RULES
-\\1ARNING!!!!
In
paragraph
10
of
Report
and
Order
in
the matter
ofMM
Docket 85-125 adopted December 20, 1985,
the commission amended Pari 73.58 to read as follows:
"
However,
auxiliary transmitters \vith nominal
power
ratings
of
100 watts
or
less
are
not required to
be
equipped
with instruments to determine
power
by
the indirect
method
provided that the licensee can
determine
t11e
antenna input
power
at all times."
The
Relative
Power
Output meter in the LPB
AM-30P
transmitter
does
not satisfy this
metering
requirement.
We
suggest the licensee
employ
an
Antenna Current Meter,
such
as
the
Simpson
model
37 (
3
Y2
)RF Ammeter. When looking into a 50 ohm load, the 30-watt transmitter needs a
0-1/\
full-scale
ammeter.
It should
be
noted that the
Commission
does not require the RF
ammeter
meter
to be m the circuit
a1
alJ
times, however, you must have and
use
this capability to
measure
the output.
3.1 ADVISING
THE
FCC
When
installing a
transmitter
for use with low
power
authorization, the user must
advise
the
Commission,
in writing
of
this action.
The
make and
model
number
of
the transmitter
must
be
submitted.
4.0
CIRCUIT
DESCRIPTION
We
do not recommend user repair
of
this equipment
but
furnish the following theory
of
operation
information for those interested. It will assist in isolating a problem. Furthennore, refer to the
troubleshooting
guide in Section 7.0
and
to the block
diagrams
and schematics in this manual,
4.1
Summary
(REFER
TO
TRANSMITTER
BLOCK
DIAGRAM,
FIG. lJ
The
transmitter uses an integrated circuit technique to generate a high-stability signal at six times
the
carrier frequency. A digital countdov,'n circuit produces the carrier frequency. which is tben
amplitude
modulated
at
a low level. A
linear
RF
power
amplifier increases the output to full rated TPO.
The
linear
RF
amplifier
allows output
power
adjustment down to about 10%
of
rated
TPO.
The internal
meter
is
used to
measure
Modulation and
Relative
RF
Power
Output.
Page
2
From the library of WØMTU
