Radio Frequency Systems 48750 Models 48750 & 48751 Cellular Repeaters User Manual Manual

Radio Frequency Systems Inc Models 48750 & 48751 Cellular Repeaters Manual

Manual

USERS MANUAL
For
48750 Series Cellular Repeater
200 Pondview Drive, Meriden, CT 06450
877 737-9675, Fax 203 821-3852, www.rfsworld.com
C
Co
op
py
yr
ri
ig
gh
ht
t
1
19
99
93
3-
-R
Ra
ad
di
io
o
F
Fr
re
eq
qu
ue
en
nc
cy
y
S
Sy
ys
st
te
em
ms
s-
-A
Al
ll
l
r
ri
ig
gh
ht
ts
s
r
re
es
se
er
rv
ve
ed
d.
.
Disclaimer
All information and statements contained herein are accurate to the best of the knowledge of Radio
Frequency Systems, but Radio Frequency Systems does not make any warranty with respect
thereto, including without limitation any results which may be obtained from the products described
herein or the infringement by such products of any proprietary rights of any persons. Use or
application of such information or statements is at the user’s sole risk, without any liability on the part
of Radio Frequency Systems. Nothing herein shall be construed as license of or recommendation for
use which infringes upon any proprietary rights of any person. Product material and specifications
are subject to change without notice. All sales of the products described herein are subject to Radio
Frequency Systems’s standard terms of sale and the specific terms of any particular sale.
USER’S MANUAL SERIES 48750 RF REPEATER AMPLIFIERS
i Dwg 13863 / Rev. 5
TABLE OF CONTENTS
General Statements -------------------------------------------------------------------------------------- --------1
M
MP
PE
E
S
St
ta
at
te
em
me
en
nt
t--------------------------------------------------------------------------------- 1
1
F
Fi
ie
el
ld
d
A
Al
li
ig
gn
nm
me
en
nt
t
S
St
ta
at
te
em
me
en
nt
t------------------------------------------------------------------- 2
2
F
FC
CC
C
a
an
nd
d
D
DO
OC
C
C
Ce
er
rt
ti
if
fi
ic
ca
at
ti
io
on
n----------------------------------------------------------------- 2
2
Product Overview and General Information ----------------------------------------------------- --------3
Block Diagram--------------------------------------------------------------------------------- 3
Electrical and Mechanical Specifications ------------------------------------------------- 4
Outline Drawing ------------------------------------------------------------------------------- 4
Automatic Gain Control---------------------------------------------------------------------- 5
Table 1. Typical Output Power------------------------------------------------------------ 5
AGC Automatic Shutdown ------------------------------------------------------------------ 5
Installation Issues---------------------------------------------------------------------------------------- --------6
Antenna Isolation ------------------------------------------------------------------------------ 6
Installation Proceedure ----------------------------------------------------------------------- 7
AC/DC Power---------------------------------------------------------------------------------- 7
Diagnostics ------------------------------------------------------------------------------------- 8
Test Points -------------------------------------------------------------------------------------- 8
Maintenance, Repair, and Warranty---------------------------------------------------------------- --------9
Periodic Maintenance ------------------------------------------------------------------------- 9
Returning Amplifiers For Repair------------------------------------------------------------ 9
Limited Warranty ------------------------------------------------------------------------------ 9
USER’S MANUAL SERIES 48750 RF REPEATER
1 120556
GENERAL STATEMENTS
M
MA
AX
XI
IM
MU
UM
M
P
PE
ER
RM
MI
IS
SS
SI
IB
BL
LE
E
E
EX
XP
PO
OS
SU
UR
RE
E
L
LI
IM
MI
IT
TS
S
T
TH
HI
IS
S
P
PR
RO
OD
DU
UC
CT
T
I
IS
S
C
CA
AT
TA
AG
GO
OR
RI
IC
CA
AL
LL
LY
Y
E
EX
XC
CL
LU
UD
DE
ED
D
F
FR
RO
OM
M
R
RO
OU
UT
TI
IN
NE
E
E
EN
NV
VI
IR
RO
ON
NM
ME
EN
NT
TA
AL
L
E
EV
VA
AL
LU
UA
AT
TI
IO
ON
N
A
AC
CC
CO
OR
RD
DI
IN
NG
G
T
TO
O
C
CF
FR
R
4
47
7
S
SE
EC
CT
TI
IO
ON
N
1
1.
.1
13
30
07
7.
.
R
Re
ep
pe
ea
at
te
er
rs
s
l
li
ik
ke
e
t
th
he
e
4
48
87
75
50
0
g
ge
en
ne
er
ra
at
te
e
r
ra
ad
di
io
o
s
si
ig
gn
na
al
ls
s
a
an
nd
d
t
th
he
er
re
eb
by
y
g
gi
iv
ve
e
r
ri
is
se
e
t
to
o
e
el
le
ec
ct
tr
ro
om
ma
ag
gn
ne
et
ti
ic
c
f
fi
ie
el
ld
ds
s.
.
T
Th
he
e
i
in
ns
st
ta
al
ll
le
er
r
i
is
s
e
ex
xp
pe
ec
ct
te
ed
d
t
to
o
h
ha
av
ve
e
a
a
c
co
om
mp
pl
le
et
te
e
u
un
nd
de
er
rs
st
ta
an
nd
di
in
ng
g
o
of
f
C
CF
FR
R
T
Ti
it
tl
le
e
4
47
7
s
se
ec
ct
ti
io
on
ns
s
1
1.
.1
13
30
07
7
a
an
nd
d
1
1.
.1
13
31
10
0.
.
A
A
b
br
ri
ie
ef
f
d
di
is
sc
cu
us
ss
si
io
on
n
f
fo
ol
ll
lo
ow
ws
s
b
bu
ut
t
i
is
s
n
no
ot
t
i
in
nt
te
en
nd
de
ed
d
t
to
o
b
be
e
a
a
s
su
ub
bs
st
ti
it
tu
ut
te
e.
.
A
Ad
dd
di
it
ti
io
on
na
al
l
i
in
nf
fo
or
rm
ma
at
ti
io
on
n
c
ca
an
n
a
al
ls
so
o
b
be
e
o
ob
bt
ta
ai
in
ne
ed
d
f
fr
ro
om
m
O
OE
ET
T
b
bu
ul
ll
li
it
te
en
n
6
65
5.
.
!
!
A
AN
NT
TE
EN
NN
NA
A
I
IN
NS
ST
TA
AL
LL
LA
AT
TI
IO
ON
N
B
BY
Y
Q
QU
UA
AL
LI
IF
FI
IE
ED
D
T
TE
EC
CH
HN
NI
IC
CA
AL
L
P
PE
ER
RS
SO
ON
NN
NE
EL
L
O
ON
NL
LY
Y.
.
!
!
I
IN
NS
ST
TA
AL
LL
LA
AT
TI
IO
ON
N
I
IN
NS
ST
TR
RU
UC
CT
TI
IO
ON
NS
S
A
AR
RE
E
F
FO
OR
R
T
TH
HE
E
P
PU
UR
RP
PO
OS
SE
E
O
OF
F
S
SA
AT
TI
IS
SF
FY
YI
IN
NG
G
F
FC
CC
C
R
RF
F
E
EX
XP
PO
OS
SU
UR
RE
E
C
CO
OM
MP
PL
LI
IA
AN
NC
CE
E
A
AN
ND
D
A
AR
RE
E
N
NO
OT
T
O
OP
PT
TI
IO
ON
NA
AL
L.
.
!
!
A
AL
LL
L
A
AN
NT
TE
EN
NN
NA
AS
S
(
(D
DO
ON
NO
OR
R
A
AN
ND
D
S
SE
ER
RV
VI
IC
CE
E)
)
A
AR
RE
E
T
TO
O
B
BE
E
F
FI
IX
XE
ED
D
M
MO
OU
UN
NT
TE
ED
D
A
AN
ND
D
P
PH
HY
YS
SI
IC
CA
AL
LL
LY
Y
S
SE
EC
CU
UR
RE
E
T
TO
O
O
ON
NE
E
L
LO
OC
CA
AT
TI
IO
ON
N.
.
!
!
M
MA
AX
XI
IM
MU
UM
M
D
DO
ON
NO
OR
R
A
AN
NT
TE
EN
NN
NA
A
G
GA
AI
IN
N
2
28
8
D
DB
B
!
!
N
NO
ON
N-
-B
BU
UI
IL
LD
DI
IN
NG
G
M
MO
OU
UN
NT
TE
ED
D
D
DO
ON
NO
OR
R
A
AN
NT
TE
EN
NN
NA
AS
S
M
MU
US
ST
T
B
BE
E
G
GR
RE
EA
AT
TE
ER
R
T
TH
HE
EN
N
1
10
0
M
ME
ET
TE
ER
RS
S
A
AB
BO
OV
VE
E
G
GR
RO
OU
UN
ND
D.
.
!
!
M
MA
AX
XI
IM
MU
UM
M
S
SE
ER
RV
VI
IC
CE
E
A
AR
RE
EA
A
A
AN
NT
TE
EN
NN
NA
A
E
ER
RP
P
I
IS
S
1
1.
.0
0
W
WA
AT
TT
T
!
!
M
MI
IN
NI
IM
MU
UM
M
S
SE
EP
PE
ER
RA
AT
TI
IO
ON
N
T
TO
O
A
AN
NY
Y
B
BO
OD
DY
Y
P
PA
AR
RT
T
O
OF
F
A
AN
NY
Y
P
PE
ER
RS
SO
ON
N
I
IS
S
2
25
5
C
CM
M
T
Th
he
er
re
e
a
ar
re
e
t
tw
wo
o
t
ty
yp
pe
es
s
o
of
f
a
an
nt
te
en
nn
na
as
s
a
at
tt
ta
ac
ch
he
ed
d
t
to
o
t
th
he
e
4
48
87
75
50
0.
.
T
Th
he
e
d
do
on
no
or
r
a
an
nt
te
en
nn
na
a
i
is
s
t
ty
yp
pi
ic
ca
al
l
r
ro
oo
of
f
m
mo
ou
un
nt
te
ed
d
a
an
nd
d
s
se
er
rv
vi
ic
ce
e
a
an
nt
te
en
nn
na
as
s
a
ar
re
e
t
ty
yp
pi
ic
ca
al
ll
ly
y
m
mo
ou
un
nt
te
ed
d
i
in
n
p
pu
ub
bl
li
ic
ca
al
ll
ly
y
a
as
ss
se
es
sa
ab
bl
le
e
a
ar
re
ea
as
s.
.
A
Al
ll
l
o
of
f
t
th
he
e
a
an
nt
te
en
nn
na
as
s
a
ar
re
e
f
fi
ix
xe
ed
d
m
mo
ou
un
nt
te
ed
d.
.
I
In
ns
st
ta
al
ll
la
at
ti
io
on
n
c
co
on
ns
si
id
de
er
ra
at
ti
io
on
ns
s
f
fo
or
r
b
bo
ot
th
h
o
of
f
t
th
he
es
se
e
w
wi
il
ll
l
b
be
e
d
di
is
sc
cu
us
ss
se
ed
d
s
se
ep
pa
ar
ra
at
te
el
ly
y.
.
D
Do
on
no
or
r
a
an
nt
te
en
nn
na
as
s
r
re
ec
ce
ei
iv
ve
e
t
th
he
e
B
Ba
as
se
e
s
si
it
te
e
T
TX
X
s
si
ig
gn
na
al
ls
s
a
an
nd
d
t
tr
ra
an
ns
sm
mi
it
t
t
th
he
e
m
mo
ob
bi
il
le
e
T
TX
X
s
si
ig
gn
na
al
ls
s
(
(8
82
24
4-
-8
84
49
9
M
MH
Hz
z)
)
b
ba
ac
ck
k
t
to
o
t
th
he
e
b
ba
as
se
e
s
si
it
te
e
(
(u
up
pl
li
in
nk
k
p
pa
at
th
h)
).
.
T
Th
he
es
se
e
a
ar
re
e
t
ty
yp
pi
ic
ca
al
ll
ly
y
m
mo
ou
un
nt
te
ed
d
o
on
n
r
ro
oo
of
f
t
to
op
ps
s
o
or
r
t
to
ow
we
er
r
s
st
tr
ru
uc
ct
tu
ur
re
es
s.
.
T
Th
he
e
m
ma
ax
xi
im
mu
um
m
c
co
om
mp
po
os
si
it
te
e
p
po
ow
we
er
r
o
of
f
t
th
he
e
4
48
87
75
50
0
u
up
pl
li
in
nk
k
p
pa
at
th
h
i
is
s
1
10
00
00
0
m
mW
W
(
(+
+3
30
0
d
dB
Bm
m)
).
.
S
Se
ec
ct
ti
io
on
n
1
1.
.3
30
07
7
(
(b
b)
)
(
(1
1)
)
e
ex
xc
cl
lu
ud
de
es
s
f
fr
ro
om
m
r
ro
ou
ut
ti
in
ne
e
e
en
nv
vi
ir
ro
on
nm
me
en
nt
ta
al
l
e
ev
va
al
lu
ua
at
ti
io
on
n
f
fa
ac
ci
il
li
it
ti
ie
es
s,
,
o
op
pe
er
ra
at
ti
io
on
ns
s,
,
a
an
nd
d
t
tr
ra
an
ns
sm
mi
it
tt
te
er
rs
s
t
th
ha
at
t,
,
a
ac
cc
co
or
rd
di
in
ng
g
t
to
o
t
ta
ab
bl
le
e
1
1
“
“C
Ce
el
ll
lu
ul
la
ar
r
R
Ra
ad
di
io
ot
te
el
le
ep
ph
ho
on
ne
e
S
Se
er
rv
vi
ic
ce
e”
”,
,
a
ar
re
e
l
le
es
ss
s
t
th
he
en
n
1
10
00
00
0
W
W
E
ER
RP
P
f
fo
or
r
b
bu
ui
il
ld
di
in
ng
g
m
mo
ou
un
nt
te
ed
d
a
an
nt
te
en
nn
na
as
s
a
an
nd
d
l
le
es
ss
s
t
th
he
en
n
1
10
00
00
0
W
W
a
an
nd
d
g
gr
re
ea
at
te
er
r
t
th
he
en
n
1
10
0
m
me
et
te
er
rs
s
a
ab
bo
ov
ve
e
g
gr
ro
ou
un
nd
d
f
fo
or
r
n
no
on
n-
-b
bu
ui
il
li
id
dn
ng
g
m
mo
ou
un
nt
te
ed
d
a
an
nt
te
en
nn
na
as
s.
.
A
As
s
s
su
uc
ch
h,
,
w
wi
it
th
h
a
a
m
ma
ax
xi
im
mu
um
m
p
po
ow
we
er
r
f
fr
ro
om
m
t
th
he
e
4
48
87
75
50
0
u
up
pl
li
in
nk
k
p
pa
at
th
h
o
of
f
1
10
00
00
0
m
mW
W
(
(+
+3
30
0
d
dB
Bm
m)
)
a
an
nd
d
a
a
m
ma
ax
xi
im
mu
um
m
a
an
nt
te
en
nn
na
a
g
ga
ai
in
n
o
of
f
2
28
8
d
dB
B,
,
t
th
he
e
d
do
on
no
or
r
a
an
nt
te
en
nn
na
a
i
in
ns
st
ta
al
ll
la
at
ti
io
on
n
w
wi
il
ll
l
n
no
ot
t
e
ex
xc
ce
ee
ed
d
1
10
00
00
0
W
Wa
at
tt
ts
s
(
(+
+6
60
0
d
dB
Bm
m)
)
a
an
nd
d
i
is
s
c
ca
at
ta
ag
go
or
ri
ic
ca
al
ll
ly
y
e
ex
xl
lc
cu
ud
de
ed
d.
.
H
Ho
ow
we
ev
ve
er
r,
,
a
ac
cc
co
or
rd
di
in
ng
g
t
to
o
s
se
ec
ct
ti
io
on
n
1
1.
.1
13
30
07
7
(
(b
b)
)
(
(1
1)
),
,
t
th
he
e
a
ap
pp
pr
ro
op
pr
ri
ia
at
te
e
e
ex
xp
po
os
su
ur
re
e
l
li
im
mi
it
ts
s
o
of
f
1
1.
.1
13
31
10
0
a
ar
re
e
a
ap
pp
pl
li
ic
ca
ab
bl
le
e
t
to
o
a
al
ll
l
f
fa
ac
ci
il
li
it
ti
ie
es
s,
,
o
op
pe
er
ra
at
ti
io
on
ns
s,
,
a
an
nd
d
t
tr
ra
an
ns
sm
mi
it
tt
te
er
rs
s.
.
A
As
s
s
su
uc
ch
h,
,
t
th
he
e
M
MP
PE
E
(
(m
ma
ax
xi
im
mu
um
m
p
pe
er
rm
mi
is
ss
sa
ab
bl
le
e
e
ex
xp
po
os
su
ur
re
e)
)
o
of
f
s
se
ec
ct
ti
io
on
n
1
1.
.1
13
31
10
0
a
ap
pp
pl
ly
y
t
to
o
t
th
he
e
d
do
on
no
or
r
a
an
nt
te
en
nn
na
a
i
in
ns
st
ta
al
ll
la
at
ti
io
on
n.
.
O
OE
ET
T
B
Bu
ul
ll
li
it
te
en
n
6
65
5
p
pr
ro
ov
vi
id
de
es
s
s
so
om
me
e
m
me
et
th
ho
od
ds
s
c
ca
al
lc
cu
ul
la
at
ti
in
ng
g
t
th
he
e
p
po
ow
we
er
r
d
de
en
ns
si
it
ty
y
b
ba
as
se
ed
d
u
up
po
on
n
t
th
he
e
E
ER
RP
P
a
an
nd
d
d
di
is
st
ta
an
nc
ce
e.
.
I
It
t
w
wo
ou
ul
ld
d
b
be
e
i
im
mp
po
os
ss
si
ib
bl
le
e
t
to
o
c
co
ov
ve
er
r
e
ev
ve
er
ry
y
p
po
os
ss
si
ib
bl
le
e
c
co
on
nf
fi
ig
gu
ur
ra
at
ti
io
on
n
i
in
n
t
th
hi
is
s
m
ma
an
nu
ua
al
l.
.
L
Li
ik
ke
ew
wi
is
se
e
i
it
t
w
wo
ou
ul
ld
d
b
be
e
u
un
nr
re
ea
as
so
on
na
ab
bl
le
e
t
to
o
d
di
ic
ct
ta
at
te
e
t
th
he
e
e
ex
xa
ac
ct
t
p
pa
ar
ra
am
me
et
te
er
rs
s
f
fo
or
r
e
ev
ve
er
ry
y
i
in
ns
st
ta
al
ll
la
at
ti
io
on
n.
.
A
As
s
m
me
en
nt
ti
io
on
ne
ed
d
i
in
n
t
th
he
e
b
be
eg
gi
in
nn
ni
in
ng
g
o
of
f
t
th
hi
is
s
s
se
ec
ct
ti
io
on
n,
,
i
it
t
i
is
s
t
th
he
e
r
re
es
sp
po
on
ns
si
ib
bi
il
li
it
ty
y
o
of
f
t
th
he
e
i
in
ns
st
ta
al
ll
le
er
r
t
to
o
k
kn
no
ow
w
a
an
nd
d
a
as
ss
su
ur
re
e
t
th
ha
at
t
s
se
ec
ct
ti
io
on
ns
s
1
1.
.1
13
30
07
7
a
an
nd
d
1
1.
.1
13
31
10
0
a
ar
re
e
b
be
ei
in
ng
g
m
me
et
t.
.
N
No
on
ne
et
th
he
el
le
es
ss
s,
,
a
a
r
re
ec
cc
co
om
me
en
nd
de
ed
d
i
in
ns
st
ta
al
ll
la
at
ti
io
on
n
s
se
en
na
ar
ri
io
o
f
fo
or
r
t
th
he
e
d
do
on
no
or
r
a
an
nt
te
en
nn
na
a
i
is
s
p
pr
ro
ov
vi
id
de
ed
d.
.
A
As
ss
su
um
mi
in
ng
g
a
a
r
ro
oo
of
f
t
to
op
p
i
in
ns
st
ta
al
ll
la
at
ti
io
on
n
a
an
nd
d
t
th
ha
at
t
t
th
he
e
a
ar
re
ea
a
i
is
s
u
un
nc
co
on
nt
tr
ro
ol
ll
le
ed
d/
/
g
ge
en
ne
er
ra
al
l
p
po
op
pu
ul
la
at
ti
io
on
n
(
(w
wo
or
rs
se
e
c
ca
as
se
e)
),
,
t
th
he
e
M
MP
PE
E
a
at
t
8
82
24
4
M
MH
Hz
z
i
is
s
.
.5
54
49
9
USER’S MANUAL
SERIES 48750 RF REPEATER
Dwg xxxxx / Rev. 1 2
m
mW
W
p
pe
er
r
c
cm
m2
2.
.
A
A
h
hi
ig
gh
he
er
r
l
le
ev
ve
el
l
i
is
s
s
sp
pe
ec
ci
if
fi
ie
ed
d
f
fo
or
r
c
co
on
nt
tr
ro
ol
ll
le
ed
d
a
ar
re
ea
as
s
i
in
n
1
1.
.1
13
31
10
0
t
ta
ab
bl
le
e
1
1
(
(A
A)
).
.
U
Us
si
in
ng
g
a
a
1
10
0
d
dB
B
g
ga
ai
in
n
y
ya
ag
gi
i
a
an
nt
te
en
nn
na
a
(
(t
ty
yp
pi
ic
ca
al
l
i
in
n
a
ab
bo
ou
ut
t
8
80
0%
%
o
of
f
i
in
ns
st
ta
al
ll
la
at
ti
io
on
ns
s)
)
a
an
nd
d
a
as
ss
su
um
mi
in
ng
g
t
th
he
e
u
up
pl
li
in
nk
k
i
is
s
b
be
ei
in
ng
g
d
dr
ri
iv
ve
en
n
t
to
o
i
it
ts
s
m
ma
ax
xi
im
mu
um
m
o
ou
ut
tp
pu
ut
t
p
po
ow
we
er
r
(
(+
+3
30
0
d
dB
Bm
m)
),
,
t
th
he
e
r
re
es
su
ul
lt
ta
an
nt
t
E
ER
RP
P
i
is
s
+
+4
40
0
d
dB
Bm
m
o
or
r
1
10
0,
,0
00
00
0
m
mW
W.
.
O
OE
ET
T
B
Bu
ul
ll
li
it
te
en
n
6
65
5
p
pr
ro
ov
vi
id
de
es
s
t
th
he
e
f
fo
or
rm
mu
ul
la
a
b
be
el
lo
ow
w
f
fo
or
r
c
ca
al
lc
cu
ul
la
at
ti
in
ng
g
t
th
he
e
p
po
ow
we
er
r
d
de
en
ns
si
it
ty
y
w
wi
it
th
h
t
th
he
e
E
EP
PA
A
r
re
ec
cc
co
om
me
en
nd
de
ed
d
f
fa
ac
ct
to
or
r
f
fo
or
r
g
gr
ro
ou
un
nd
d
r
re
el
lf
fe
ec
ct
ti
io
on
n:
:
1
1.
.0
05
5
E
ER
RP
P
/
/
π
π
R
R2
2W
Wh
he
er
re
e
R
R
i
is
s
t
th
he
e
d
di
is
st
ta
an
nc
ce
e
t
to
o
c
ce
en
nt
te
er
r
(
(a
an
ny
y
b
bo
od
dy
y
p
pa
ar
rt
t
o
of
f
p
pe
er
rs
so
on
n)
)
S
So
ol
lv
vi
in
ng
g
f
fo
or
r
1
10
0,
,0
00
00
0
m
mW
W
a
at
t
3
3
f
ft
t.
.
(
(9
91
1.
.4
44
4
c
cm
m)
)
w
we
e
g
ge
et
t
a
a
p
po
ow
we
er
r
d
de
en
ns
si
it
ty
y
o
of
f
.
.4
4
m
mW
W
p
pe
er
r
c
cm
m2
2.
.
T
Th
he
e
y
ya
ag
gi
i
a
an
nt
te
en
nn
na
a
i
in
n
t
th
hi
is
s
s
se
en
na
ar
ri
io
o
m
mu
us
st
t
b
be
e
m
mo
ou
un
nt
te
ed
d
i
in
n
s
su
uc
ch
h
a
a
w
wa
ay
y
t
th
ha
at
t
n
no
o
b
bo
od
dy
y
p
pa
ar
rt
t
o
of
f
a
an
ny
y
p
pe
er
rs
so
on
n
m
ma
ay
y
c
co
om
me
e
c
cl
lo
os
se
er
r
t
th
he
en
n
3
3
f
fe
ee
et
t
i
in
n
t
th
he
e
d
di
ir
re
ec
ct
ti
io
on
n
o
of
f
t
th
he
e
m
ma
ai
in
n
p
po
ow
we
er
r
b
be
ea
am
m.
.
T
Th
hi
is
s
w
wi
il
ll
l
l
li
im
mi
it
t
e
ex
xp
po
os
su
ur
re
e
t
to
o
w
we
el
ll
l
w
wi
it
th
hi
in
n
t
th
he
e
M
MP
PE
E
S
Se
er
rv
vi
ic
ce
e
a
an
nt
te
en
nn
na
as
s
a
ar
re
e
a
al
ls
so
o
f
fi
ix
xe
ed
d
m
mo
ou
un
nt
te
ed
d
a
an
nd
d
c
co
ov
ve
er
re
ed
d
b
by
y
t
th
he
e
s
sa
am
me
e
M
MP
PE
E
c
co
on
ns
si
id
de
er
ra
at
ti
io
on
ns
s
a
as
s
t
th
he
e
d
do
on
no
or
r
a
an
nt
te
en
nn
na
a.
.
H
Ho
ow
we
ev
ve
er
r,
,
i
it
t
c
ca
an
n
b
be
e
a
as
ss
su
um
me
ed
d
t
th
ha
at
t
t
th
he
e
a
ar
re
ea
a
i
is
s
a
al
lw
wa
ay
ys
s
g
ge
en
ne
er
ra
al
l
p
po
op
pu
ul
la
at
ti
io
on
n/
/u
un
nc
co
on
nt
tr
ro
ol
ll
le
ed
d
a
an
nd
d
t
th
ha
at
t
t
th
he
e
m
mi
in
ni
im
mu
um
m
d
di
is
st
ta
an
nc
ce
e
i
in
n
m
mo
os
st
t
i
in
ns
st
ta
al
ll
la
at
ti
io
on
ns
s
w
wi
il
ll
l
b
be
e
l
le
es
ss
s
t
th
he
en
n
3
3
f
fe
ee
et
t.
.
A
Ac
cc
co
or
rd
di
in
ng
g
t
to
o
t
ta
ab
bl
le
e
1
1
(
(B
B)
)
o
of
f
s
se
ec
ct
ti
io
on
n
1
1.
.1
13
31
10
0,
,
t
th
he
e
M
MP
PE
E
f
fo
or
r
p
po
ow
we
er
r
d
de
en
ns
si
it
ty
y
a
at
t
8
89
94
4
M
MH
Hz
z
(
(w
wo
or
rs
se
e
c
ca
as
se
e
d
do
ow
wn
nl
li
in
nk
k)
)
i
is
s
.
.5
59
96
6
m
mW
W
/
/
c
cm
m2
2.
.
T
Th
he
e
m
ma
ax
xi
im
mu
um
m
p
po
ow
we
er
r
o
ou
ut
t
o
of
f
t
th
he
e
4
48
87
75
50
0
o
on
n
t
th
he
e
d
do
ow
wn
nl
li
in
nk
k
(
(b
ba
as
se
e
t
to
o
s
se
er
rv
vi
ic
ce
e
a
ar
re
ea
a)
)
i
is
s
+
+3
30
0
d
dB
Bm
m
(
(1
10
00
00
0
m
mW
W)
).
.
A
As
ss
su
um
mi
in
ng
g
n
no
o
f
fe
ee
ed
de
er
r
a
ab
bl
le
e
l
lo
os
ss
s
a
an
nd
d
a
a
s
se
er
rv
vi
ic
ce
e
a
ar
re
ea
a
a
an
nt
te
en
nn
na
a
g
ga
ai
in
n
o
of
f
0
0
d
dB
B,
,
a
a
s
sa
av
ve
e
m
mi
in
ni
im
mu
um
m
s
se
ep
pe
er
ra
at
ti
io
on
n
o
of
f
2
25
5
c
cm
m
(
(1
10
0
i
in
nc
ch
he
es
s)
)
i
is
s
r
re
eq
qu
ui
ir
re
ed
d
t
to
o
s
st
ta
ay
y
w
wi
it
th
hi
in
n
t
th
he
e
M
MP
PE
E.
.
1
1.
.0
05
5
x
x
1
10
00
00
0
m
mW
W
/
/
3
3.
.1
14
4
x
x
2
25
52
2
=
=
1
10
05
50
0
/
/
1
19
96
62
2.
.5
5
=
=
.
.5
53
35
5
m
mW
W
/
/
c
cm
m2
2
T
Th
hu
us
s,
,
t
th
he
e
s
se
er
rv
vi
ic
ce
e
a
ar
re
ea
a
a
an
nt
te
en
nn
na
as
s
s
sh
ho
ou
ul
ld
d
b
be
e
m
mo
ou
un
nt
te
ed
d
s
su
uc
ch
h
t
th
ha
at
t
a
a
n
no
o
b
bo
od
dy
y
p
pa
ar
rt
ts
s
o
of
f
a
an
ny
y
p
pe
er
rs
so
on
n
m
ma
ay
y
c
co
om
me
e
c
cl
lo
os
se
er
r
t
th
ha
at
t
2
25
5
c
cm
m.
.
T
Th
he
e
s
se
er
rv
vi
ic
ce
e
a
ar
re
ea
a
a
an
nt
te
en
nn
na
a
g
ga
ai
in
n
i
is
s
0
0
d
dB
B
i
in
n
t
th
he
e
e
ex
xa
am
mp
pl
le
e
a
ab
bo
ov
ve
e
b
bu
ut
t
m
ma
ay
y
b
be
e
i
in
nc
cr
re
ea
as
se
ed
d
t
to
o
m
ma
ak
ke
e
u
up
p
f
fo
or
r
c
ca
ab
bl
le
e
a
an
nd
d/
/o
or
r
s
sp
pl
li
it
tt
te
er
r
o
or
r
t
ta
ap
p
l
lo
os
ss
se
es
s.
.
F
Fo
or
r
e
ex
xa
am
mp
pl
le
e;
;
i
if
f
a
a
2
2
w
wa
ay
y
s
sp
pl
li
it
tt
te
er
r
i
is
s
u
us
se
ed
d
t
to
o
p
pr
ro
ov
vi
id
de
e
f
fo
or
r
t
tw
wo
o
a
an
nt
te
en
nn
na
as
s
i
in
n
d
di
if
ff
fe
er
re
en
nt
t
p
pa
ar
rt
ts
s
o
of
f
t
th
he
e
s
se
er
rv
vi
ic
ce
e
a
ar
re
ea
a,
,
t
th
he
en
n
t
th
he
e
a
an
nt
te
en
nn
na
a
g
ga
ai
in
n
m
ma
ay
y
b
be
e
i
in
nc
cr
re
ea
as
se
ed
d
t
to
o
3
3
d
dB
B
t
to
o
m
ma
ak
ke
e
u
up
p
f
fo
or
r
t
th
he
e
l
lo
os
ss
s
o
of
f
t
th
he
e
s
sp
pl
li
it
te
er
r
3
3.
.6
6
d
dB
B.
.
T
Th
he
e
m
ma
ax
xi
im
mu
um
m
s
se
er
rv
vi
ic
ce
e
a
ar
re
ea
a
a
an
nt
te
en
nn
na
a
g
ga
ai
in
n
f
fo
or
r
a
an
ny
y
s
sp
pe
ec
ci
if
fi
ic
c
l
lo
oc
ca
at
ti
io
on
n
c
ca
an
n
b
be
e
c
ca
al
lc
cu
ul
la
at
te
ed
d
b
by
y:
:
0
0
d
dB
B
+
+
a
ac
cc
cu
um
mu
ul
la
at
te
ed
d
l
lo
os
ss
se
es
s
t
to
o
t
th
he
e
a
an
nt
te
en
nn
na
a.
.
FIELD TUNE-UP, ALIGNMENT OR CALIBRATION
The 48750 series of bi-directional amplifers are aligned and calibrated at the time of manufacture.
These units are designed to retain this calibration for the useful life of the product. There is no field tune-
up or alignment necessary.
FCC ID AND CANADA CERTIFICATION NUMBERS
The listed models have been tested and granted Certification by the FCC in accordance with Title 47,
Part 22, and have been granted Certification by the DOC in accordance with RS 118, Issue 2.
The FCC identification number for each particular model appears on a label within the amplifier
enclosure as required by the FCC. Applicable FCC Identification and DOC Certification Numbers are
shown in Table 1.
FCC ID Number CANADA
USER’S MANUAL SERIES 48750 RF REPEATER
3 120556
IWD 48750 XXXX XXXX
PRODUCT OVERVIEW and GENERAL INFORMATION
The 48750 series band specific Cellular Repeaters are designed to enhance radio communications in
buildings, basements, tunnels and other RF shielded environments. The 48750 is tuned for A band only
operation, the 48751 is tuned for B band only.
These units work by receiving and amplifying the Base TX signals via a donor antenna directed at the
desired base site. This RF path is called the ‘downlink”. The amplified base TX signal is re-radiated via
antenna(s) or radiating cable into the “Service Area”. Subscriber mobile RF signals are received by the
same service area radiating elements, amplifed in the “uplink”RF path to be radiated back to the base via
the donor antenna.
Duplexing band pass filters direct the RF signal to the proper gain path. Band selective down conversion
filtering is used to provide exceptional band edge rejection of the competitive spectrum. Amplification
consist of independent amplifiers in the Down and Up links respectively, as shown in the block diagram.
Both links have AGC to prevent overdrive. Manual gain adjustment is provided. The composite output
power is set at the factory and limited by the AGC circuitry so that intermodulation signals will not exceed
-13 dBm as specified by the FCC.
LED indicators provide visual diagnostics for the 48750 series. DC and TTL Test points provide more
indepth information for set up and troubleshooting. Together with the diagnostics section of this manual,
these features make field set up and repair fast and easy.
USER’S MANUAL
SERIES 48750 RF REPEATER
Dwg xxxxx / Rev. 1 4
ELECTRICAL / MECHANICAL SPECIFICATIONS
S
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.
USER’S MANUAL SERIES 48750 RF REPEATER
5 120556
INTERMODULATION PRODUCTS, AGC, AND OUTPUT POWER
A general requirement exists within 47 CFR 90, Subpart I and 47 CFR 22, Subpart K regarding
emissions outside of any particular channel of operation. As a general rule, there shall be no spurious
emissions greater than {43 + 10 Log10 (Power Out watts)} dB below the carrier Power Out (dB) level.
This is always equivalent to a fixed level of -13 dBm maximum spurious emission.
Radio Frequency Systems has designed the 48750 amplifier line using a combination of an automatic
gain control and a low distortion power amplifier to achieve maximum output while automatically
maintaining spurious intermodulation levels below -13 dBm for any number of input channels.
AGC automatically varies the overall gain of the system by up to 20 dB. The gain set by AGC is a
function of the total power present in the amplifier at the final output power amplifier stage. The total
power level is the sum of all signals within the applicable bandwidth. This includes all active channels, all
intermodulation products, and any other noise power in the band.
Table 4 lists the typical output power per channel which can be expected from the amplifier for a given
number of active channels operating at equal input levels. The numbers given in Table 4 are valid only
when operating within the active AGC region of the AGC amplifier stage. Operation in the AGC region
occurs for input power levels such that the sum of total input power plus the amplifier's maximum gain
exceeds the stated maximum level for the given number of channels. AGC will then actively limit the total
output power to the stated maximum levels.
TABLE 1. TYPICAL OUTPUT POWER

  
 
 
 
 
  
  
  
AGC AUTOMATIC SHUTDOWN
When the automatic gain control circuit reaches its control limit, power to the power amplifier stage is
cut. This feature ensures that spurious emissions are never allowed to exceed permissible levels. Note
that only the path (Tx or Rx) which has reached its control limit is shut down.
Shutdown will only occur if the AGC control limit is reached and maintained for about a half second.
Power is then cut for 5 to 7 seconds. After this time-out, power is brought back on-line. If the overload
condition is still present, shutdown will again occur in about a half second. This cycle will be repeated
until the condition causing AGC to reach its limit is removed. Conditions which can cause AGC to reach
USER’S MANUAL
SERIES 48750 RF REPEATER
Dwg xxxxx / Rev. 1 6
its limit include the presence of one or more very strong channels, a strong in-band noise source, amplifier
oscillation, etc.
INSTALLATION ISSUES
ANTENNA ISOLATION
Proper implementation of the antennas is absolutely crucial to the repeater system. Several important
issues must be considered when selecting and implementing the antennas. The most important
consideration, besides the obvious concerns for gain and area of coverage, is the antenna isolation. Radio
Frequency Systems Technical Support is available at 800-659-1880 to assist with antenna selection and
installation considerations.
BASE STATION AND SERVICE AREA ANTENNA ISOLATION SHOULD BE A MINIMUM OF 20
dB GREATER THAN THE MAXIMUM GAIN OF THE REPEATER AMPLIFIER. If the isolation is
less than the amplifier gain, then positive feedback sufficient for oscillation is present in the system. Such
oscillations will overdrive one or both amplifier chains and continuously activate the AGC auto-shutdown
circuitry. This situation will be apparent by all status LEDs lighting up and then quickly off every 5
seconds.
Also, gain ripple as a function of frequency, antenna spacing, and antenna isolation is always present in
the system due to feedback. The feedback is a function of the frequency and spacing (i.e., the standing
wave between the antennas). The magnitude of the ripple can be expected to be on the order of 5.7 dB for
a 10 dB isolation-gain margin. 11 dB ripple for a 5 dB isolation margin, 1.7 dB ripple for a 20 dB margin,
and 0.5 dB for a 30 dB isolation margin. The ripple goes to infinity at 0 dB margin thus indicating runaway
oscillation. In general the magnitude of ripple may be calculated from:
Ripple = 20 LOG10 {(1 + [A] [B]) / (1 - [A] [B])} dB
where: [A] is the magnitude of the forward voltage gain of the repeater as a function of frequency.
[B] is the feedback voltage "gain" magnitude as a function of frequency.
Antenna isolation may be achieved by several means. High-gain (high directivity) antennas usually have a
significant front-to-back ratio (isolation between front and back). Additional decoupling can be achieved
by spatially separating the antennas. Other factors influencing isolation include multi-path reflections,
structures, other antennas, passing vehicles, personnel proximity, etc.
Generally, for in-building applications with one outside antenna and one or more indoor antennas, the
isolation due to spatial separation and the structure itself is adequate. It is always best to measure the
actual isolation under worst case conditions, if possible. The most direct way to measure the isolation is
to inject a known signal into one antenna, and measure the coupled signal at the other antenna. This
should be done across the applicable bandwidth to account for the frequency dependency of standing
waves.
4
48
87
75
50
0
D
Do
on
no
or
r
A
An
nt
te
en
nn
na
a
S
Se
er
rv
vi
ic
ce
e
A
An
nt
te
en
nn
na
a(
(s
s)
)
USER’S MANUAL SERIES 48750 RF REPEATER
7 120556
INSTALLATION PROCEEDURE
Review this entire manual
Do not apply power until antennas have been connected to botht eh base and service area ports
! Install donor antenna, aligned with desired base site and measure base signal strength.
The 48750 has sufficiniet filtering to prevent undesired signals from causing interference, however, it
is best to use a directional donor antenna to reduce the chance for interfernece by directing the mobile
signals only towards the desired donor base site.
The 48750 will work with a wide range of RF input signal levels. Ideal levels on the down link are in
the range of –60 to –70 dBm. These levels will provide the maximum output power while not causing
significant ovedrive.
! Connect the donor antenna to the 48750 via 50 ohm coaxial cable.
Size and type of cable are a matter of choice. Typically ½” Flexwell foam coax is used, plenum rated
for inside buildings and work areas. However, 7/8th cable may be used to reduce the longitudinal loss.
½’ or smaller superflex cables are easier to install but have higher longitudinal loss.
! Install service area antenna(s).
Determine the location and type of service area antennas is part of the distribution system design.
Generally it is desired to minimize the amount of coax that has to be installed. However, in buidlings
with extensive obstructions it may be neccesary to install several service area antennas For assistance
with antenna placement contact RFS Applications Engineering. Observe MPE cautions when
determining the type and location of all antennas (see section 1)!
! Connect service antenna(s) via 50 ohm coaxial cable
Multiple service area antenna(s)/radiating cable runs may be connected the 48750. Splitters and taps
may be used to accommodate unique distribution systems.
! Mount the 48750 Repeater upright, make sure there is sufficient space above and below the unit to allow
air to flow through the heat sink. Check to make sure the AC power cord can reach the power source.
Also provide adaquet bending room for the coxial cable.
! Connect 50 ohm cables – donor antenna to “Base”, service antenna(s) to “Service”
! Connect AC power to the 48750 and observe power and fault lights
AC / DC POWER
AC power is supplied through a standard 3-wire male plug connected through a standard IEC-320 plug.
Connect this plug to any standard 3-wire 120 VAC outlet. A 5 x 20 mm, 3.15 amp fast blow fuse is used
to cut power in the event of a severe AC fault. A 5 amp mini ATO fuse is used between the 28 VDC
from the power supply and the control board which distributes the power to all components. This is
located on the control board.
WARNING: ALWAYS REMOVE POWER BEFORE CHECKING OR CHANGING FUSES.
120 VAC can be lethal. Always unplug the amplifier before servicing the interior. Never insert
conductive objects into any opening. Do not remove or probe under the plastic safety cover over the AC
terminals of the 24 VDC power supply. Always use a standard 3-wire electrical outlet with safety ground
for AC power.
USER’S MANUAL
SERIES 48750 RF REPEATER
Dwg xxxxx / Rev. 1 8
DIAGNOSTICS
A green power LED will light up when AC power is supplied. If this fails, check power source and the
the AC fuse located in the EIC plug. If the power source and fuse are OK then the internal switching
power supply has failed and will need replacement.
The Red LED indicates a summary fault from any of the fault conditions identified in the Test Points
section. Specific action is describe in that section.
TEST POINTS
T
Th
he
e
D
D-
-s
su
ub
b
c
co
on
nn
ne
ec
ct
to
or
r
i
is
s
l
lo
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ca
at
te
ed
d
o
on
n
t
th
he
e
b
bo
ot
tt
to
om
m
o
of
f
t
th
he
e
u
un
ni
it
t.
.
A
A
D
DC
C
V
VO
OM
M
c
ca
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n
b
be
e
u
us
se
ed
d
t
to
o
q
qu
ui
ic
ck
kl
ly
y
a
as
ss
se
es
ss
s
t
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he
e
h
he
ea
al
lt
th
h
o
of
f
t
th
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e
4
48
87
75
50
0.
.
T
Th
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e
f
fo
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ll
lo
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t
th
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e
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D-
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ub
b
p
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in
n-
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t:
:
1
1
R
Rx
x
L
LN
NA
A
A
Al
la
ar
rm
m,
,
l
lo
og
gi
ic
c,
,
l
lo
ow
w
=
=
f
fa
au
ul
lt
t
2
2
T
Tx
x
L
LN
NA
A
A
Al
la
ar
rm
m,
,
l
lo
og
gi
ic
c,
,
l
lo
ow
w
=
=
f
fa
au
ul
lt
t
3
3
R
Rx
x
C
Co
on
nv
ve
er
rt
te
er
r
A
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la
ar
rm
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,
l
lo
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gi
ic
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,
l
lo
ow
w
=
=
f
fa
au
ul
lt
t
4
4
T
Tx
x
C
Co
on
nv
ve
er
rt
te
er
r
A
Al
la
ar
rm
m,
,
l
lo
og
gi
ic
c,
,
l
lo
ow
w
=
=
f
fa
au
ul
lt
t
5
5
R
Rx
x
P
PA
A
A
Al
la
ar
rm
m,
,
l
lo
og
gi
ic
c,
,
l
lo
ow
w
=
=
f
fa
au
ul
lt
t
6
6
T
Tx
x
P
PA
A
A
Al
la
ar
rm
m,
,
l
lo
og
gi
ic
c,
,
l
lo
ow
w
=
=
f
fa
au
ul
lt
t
C
Co
on
nd
di
it
ti
io
on
ns
s
1
1
–
–
6
6
r
re
eq
qu
ui
ir
re
e
u
un
ni
it
t
t
to
o
b
be
e
s
se
en
nt
t
i
in
n
f
fo
or
r
s
se
er
rv
vi
ic
ce
e
7
7
T
Te
em
mp
pe
er
ra
at
tu
ur
re
e
A
Al
la
ar
rm
m,
,
l
lo
og
gi
ic
c,
,
l
lo
ow
w
=
=
f
fa
au
ul
lt
t
C
Ch
he
ec
ck
k
f
fo
or
r
a
ai
ir
r
f
fl
lo
ow
w
p
pa
as
st
t
h
he
ea
at
t
s
si
in
nk
k.
.
I
If
f
t
th
hi
is
s
f
fa
ai
il
ls
s,
,
s
se
en
nd
d
u
un
ni
it
t
i
in
n
f
fo
or
r
r
re
ep
pa
ai
ir
r.
.
8
8
A
AG
GC
C
A
Al
la
ar
rm
m,
,
l
lo
og
gi
ic
c,
,
l
lo
ow
w
=
=
f
fa
au
ul
lt
t
I
In
nd
di
ic
ca
at
te
es
s
o
ov
ve
er
rd
dr
ri
iv
ve
e.
.
C
Ch
he
ec
ck
k
f
fo
or
r
e
ex
xc
ce
es
ss
si
iv
ve
e
i
in
np
pu
ut
t
s
si
ig
gn
na
al
l
o
or
r
i
in
na
ad
de
eq
qu
ua
at
te
e
a
an
nt
te
en
nn
na
a
i
is
so
ol
la
at
ti
io
on
n.
.
9
9
D
Di
is
sa
ab
bl
le
e
(
(i
in
np
pu
ut
t)
),
,
l
lo
og
gi
ic
c,
,
h
hi
ig
gh
h
=
=
d
di
is
sa
ab
bl
le
e
R
Re
em
mo
ot
te
e
d
di
is
sa
ab
bl
le
e
f
fe
ea
at
tu
ur
re
e
1
10
0
R
Rx
x
A
AG
GC
C
V
Vo
ol
lt
ta
ag
ge
e,
,
a
an
na
al
lo
og
g,
,
n
no
o
A
AG
GC
C
a
ap
pp
pr
ro
ox
x.
.
2
26
6.
.5
5V
VD
DC
C,
,
F
Fu
ul
ll
l
A
AG
GC
C
a
ap
pp
pr
ro
ox
x.
.
7
7.
.6
65
5V
VD
DC
C
1
11
1
T
Tx
x
A
AG
GC
C
V
Vo
ol
lt
ta
ag
ge
e,
,
a
an
na
al
lo
og
g,
,
n
no
o
A
AG
GC
C
a
ap
pp
pr
ro
ox
x.
.
2
26
6.
.5
5V
VD
DC
C,
,
F
Fu
ul
ll
l
A
AG
GC
C
a
ap
pp
pr
ro
ox
x.
.
7
7.
.6
65
5V
VD
DC
C
P
Pi
in
ns
s
1
10
0
a
an
nd
d
1
11
1
p
pr
ro
ov
vi
id
de
e
i
in
nd
di
ic
ca
at
ti
io
on
n
o
of
f
t
th
he
e
a
am
mo
ou
un
nt
t
o
of
f
A
AG
GC
C
a
at
tt
te
en
nu
ua
at
ti
io
on
n.
.
F
Fu
ul
ll
l
A
AG
GC
C
i
in
nd
di
ic
ca
at
te
es
s
s
st
tr
ro
on
ng
g
d
dr
ri
iv
ve
e
s
si
ig
gn
na
al
l
o
or
r
p
po
os
ss
si
ib
bl
le
e
o
os
sc
ci
il
ll
la
at
ti
io
on
n
a
an
nd
d
s
sh
ho
ou
ul
ld
d
b
be
e
a
av
vo
oi
id
de
ed
d.
.
C
Ch
he
ec
ck
k
d
dr
ri
iv
ve
e
l
le
ev
ve
el
ls
s
a
an
nd
d
a
an
nt
te
en
nn
na
a
i
is
so
ol
la
at
ti
io
on
n.
.
R
Re
ed
du
uc
ce
e
m
ma
an
nu
ua
al
l
g
ga
ai
in
n
t
to
o
r
re
el
la
ax
x
A
AG
GC
C
l
le
ev
ve
el
l
i
if
f
n
ne
ee
ed
de
ed
d.
.
1
12
2
R
Rx
x
D
Dr
ri
iv
ve
e
V
Vo
ol
lt
ta
ag
ge
e,
,
a
an
na
al
lo
og
g,
,
a
ap
pp
pr
ro
ox
x.
.
0
0
t
to
o
3
3V
VD
DC
C
@
@
a
ap
pp
pr
ro
ox
x.
.
0
0.
.3
3V
VD
DC
C
p
pe
er
r
d
dB
B
w
wi
it
th
h
n
no
o
A
AG
GC
C,
,
c
ch
ha
an
ng
ge
es
s
v
ve
er
ry
y
l
li
it
tt
tl
le
e
i
in
n
A
AG
GC
C
1
13
3
T
Tx
x
D
Dr
ri
iv
ve
e
V
Vo
ol
lt
ta
ag
ge
e,
,
a
an
na
al
lo
og
g,
,
a
ap
pp
pr
ro
ox
x.
.
0
0
t
to
o
3
3V
VD
DC
C
@
@
a
ap
pp
pr
ro
ox
x.
.
0
0.
.3
3V
VD
DC
C
p
pe
er
r
d
dB
B
w
wi
it
th
h
n
no
o
A
AG
GC
C,
,
c
ch
ha
an
ng
ge
es
s
v
ve
er
ry
y
l
li
it
tt
tl
le
e
i
in
n
A
AG
GC
C
1
14
4
G
Gr
ro
ou
un
nd
d
1
15
5
+
+5
5V
VD
DC
C,
,
t
th
he
er
rm
ma
al
ll
ly
y
f
fu
us
se
ed
d
(
(s
se
el
lf
f-
-r
re
es
se
et
tt
ti
in
ng
g)
),
,
5
50
0m
mA
A
m
ma
ax
x.
.
P
Pi
in
ns
s
1
14
4&
&1
15
5
a
ar
re
e
u
us
se
ed
d
t
to
o
d
dr
ri
iv
ve
e
a
a
d
di
ia
ag
gn
no
os
st
ti
ic
cs
s
m
mo
od
du
ul
le
e
w
wh
hi
ic
ch
h
w
wi
il
ll
l
p
pr
ro
ov
vi
id
de
e
L
LE
ED
D
i
in
nd
di
ic
ca
at
ti
io
on
n
o
of
f
t
th
he
e
D
D-
-s
su
ub
b
p
pi
in
ns
s.
.
USER’S MANUAL SERIES 48750 RF REPEATER
9 120556
MAINTENANCE, REPAIR, AND WARRANTY
PERIODIC MAINTENANCE
There is no maintenance for the 48750. As long as the amplifiers are kept away from extreme
temperatures and moisture, the amplifier should provide long-term, care-free operation.
However, as a system periodically check all RF connections for corrosion, strain damage, and tightness
and periodically check the AC power connections for integrity
ORDERING & RETURNING COMPONENTS
For technical assistance call Radio Frequency Systems Sales Engineering at 1-800-659-1880.
For returns, repairs and ordering, contact Radio Frequency Systems Customer Service at
1-800-321-4700 for a Return Authorization Number. Be prepared to provide the model number and serial
number of the BDA as well as a description of the symptoms of the problem.
Send components or units freight-paid with the Return Authorization Number on the outside of the
package to: Radio Frequency Systems Corvallis
4100 S.W. Research Way
Corvallis, Oregon 97333
LIMITED WARRANTY
The Seller warrants that, at the time of shipment, the products manufactured by the Seller are free from
defects in material and workmanship. The Seller's obligation under this warranty is limited to replacement
or repair of such products within one year from date of shipment. No material is accepted for replacement
or repair without written authority of the Seller. Replacement or repair is made only after an examination
at the Seller's plant shows defective material or workmanship at the time of manufacture. All shipping
charges on the returned material must be prepaid by the Buyer.
The Seller is in no event liable for consequential damages, installation costs or other costs of any nature
as a result of the use of the products manufactured by the Seller, whether used in accordance with
instructions or not. The Seller is not liable for replacement of any product damaged by lightning.
USER’S MANUAL
SERIES 48750 RF REPEATER
Dwg xxxxx / Rev. 1 10
THIS WARRANTY IS IN LIEU OF ALL OTHERS, EITHER EXPRESSED OR IMPLIED. No
representative is authorized to assume for the Seller any other liability in connection with the Seller's
products.

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