Uniden BC-890XLT_Cellular_modification_1993.pdf Uniden_BC-890XLT_Cellular_modification_1993.pdf
ask bob
Bob
Grove, WA4PYQ
Q.
Grove
Elgee,
Uniden
No
modifier, Larry
boot!
Although
damages resulting
unlawful
The modification requires delicate
are unfamiliar
TOOLS
1. Remove
plug and set the cabinet
2. Remove the four faceplate screws and
loosen the faceplate. Carefully
the
3.
Unplug connectors J4 and
J503 (CAREFULLY
and logic board together.
4. Position the circuit
1514), and the three
the closest of the three
the memory
5. Reassemble the
reassemble
transmit through the
MiniTuner?
Jennifer
Moncton, NB,
C
BC890XLT
sooner did the
to
monitor cellular telephone conversations.
NEEDED:
all ten
faceplate downward toward you,
new Uniden BC890XLT scanner hit the streets than our intrepid scanner
Wiland,
we
with
battery as shown.
the cover.
figured
validated
have
from attempting
surface
Philips
cabinet screws and carefully
nudge them loose by pulling close to
board as shown below and
chip
(marked "104 ") and reinstall
front panel
This completes the cellular
Day
Canada)
Bo
Ws
Cellular
out
this
-mount devices and microsoldering techniques.
screwdriver,
sections aside.
depress the outside edges of the
(white
J5
resistors by the chip's upper -right -hand
and all connectors.
you
Can
A. No. The MiniTuner is not an impedance
matching device; it is a frequency
-
Tip of
preselector
swath of frequency spectrum
the
whose
Month
sole purpose is to narrow the
being fed to the
Modification
the cellular restoration -with appropriate 30 kHz
procedure in
this
manipulation
exposing
and
our
own labs, MT accepts no responsibility for
modification, and
of
fragile
small -tip soldering
separate
bracket
one
blue wires),
the halves; carefully
screw at the center of the main
the
logic board.
and ribbon connectors J501, J502
locate the microprocessor chip
it between the two empty
the
Test
restoration and
we remind our readers that it
components;
iron, small gauge rosin -core solder.
metal
sockets).
the
radio by entering 871.200
not
do
attempt
unplug
faceplate shield and tilt
Remove
corner. Carefuly unsolder
30 kHz tuning step.
the
(Uniden ÚC-
pads closest to
- tunable
steps, to
it
you
if
the speaker
board
to
and
faceplate
MHz, then
receiver. Since
nents are much too
level power.
Q. One of
installed
fence" which
transmitting
What frequency
will it
and
receiver?
Hills,
OH)
When I push
button
lock;
is
I've
anything
What frequency
on? (George
CA)
A. Neither
because of rigid
power)
(low
There are
spectrum reserved
medical (ISM)
13.56,
27.12, 40.68
ally, some frequency
used by garage
Up
dogs
run loose
I've never
Any
of our readers
things are
it is for
reception only, compo-
fragile to
my neighbors
"invisible
an
controls
signals
does it work
cause
interference
(Jeffrey Zell,
the remote
my
on
car
alarm,
been unable
on my frequency
are these devices
Froberg,
device
radiation devices
here in
seen either
on?
likely
is
FCC
restrictions
several
frequencies
for industrial,
radiations;
and
902 -928
ranges
door openers.
the mountains,
and
leaves
of these
know what
transmitter -
handle
has
radio
dog
by
pets
to their
collars.
on
to
Walton
control
my
doors
to measure
counter.
Mill Valley,
to cause
his car unlocked,
interference
against Part
like these.
throughout
scientific and
these include
MHz. Addition-
near 300
everyone
devices
frequency
MHz
up close.
lets his
my
15
the
6.78,
are
so
these
106
Illlllllllllll
Unsolder
July 1993
and remove this
resistor (marked
"104 ")
MONITORING
Reinstall
www.americanradiohistory.com
the resistor
these two
TIMES
across
empty pads
Why
Q.
fade
do AM
when
you
bridge but FM
Greenberg,
A.
all
It
between
higher the
Shorter
more easily
materials
wavelengths
How
Q.
in
my
attic
ing
it
at
the roof?
Summit,
Skokie, IL)
has to
do
successive
frequency,
wavelengths
reflected
like metal
(AM
will
mounting
be
about
Tom
MO)
broadcast
drive
signals
with
wavelength,
waves
of
the
shorter
(the
and
scattered
and
earth
broadcast)
different
the
same
Carroll,
signals
under
a
don't?
the
a
radio signal.
the wavelength.
FM signal)
by
conductive
than
are
are
an
antenna
from
the longer
absorbed.
mount-
which
height
Lee's
(Ken
spacing
The
are
on
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