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BC9000XLT Discriminator Modifications
Although it will void your warranty, it's easy to add a baseband audio
output jack to connect the BC9000XLT to a CTCSS or DTMF reader, such as
the CSI CD-1. You only need to drill a hole on the rear panel, mount a
phono jack, and wire it to the appropriate point on the main printed
circuit board (Figure 1).
Drill and deburr a 1/4" hole through the BC9000XLT rear panel, in the
vicinity of the jack labeled DC13.8V. Mount an RCA-type phono jack (Radio
Shack #274-346) through the hole and fasten with the supplied hardware.
On the top of the main board, find the test point labeled TP3, located
about 3 inches behind the AUX jack. You can choose to solder a wire to
TP3 from either the top or bottom of the printed circuit board, but it's
easier to solder it to the bottom because the bottom solder pad is
larger.
Connect a wire from TP3 to the center pin of the newly added jack. It's a
good idea to use very small diameter coaxial cable, e.g. RG174/U, but
ordinary hookup wire will suffice. If you use hookup wire, connect
another wire from the ground lug of the new jack to a ground pad on the
printed circuit board, or place a solder lug under the nearest screw which
holds the board to the chassis and solder the ground wire to the solder
lug....
</p>
Although it will void your warranty, it's easy to add a baseband audio
output jack to connect the BC9000XLT to a CTCSS or DTMF reader, such as
the CSI CD-1. You only need to drill a hole on the rear panel, mount a
phono jack, and wire it to the appropriate point on the main printed
circuit board (Figure 1).
Drill and deburr a 1/4" hole through the BC9000XLT rear panel, in the
vicinity of the jack labeled DC13.8V. Mount an RCA-type phono jack (Radio
Shack #274-346) through the hole and fasten with the supplied hardware.
On the top of the main board, find the test point labeled TP3, located
about 3 inches behind the AUX jack. You can choose to solder a wire to
TP3 from either the top or bottom of the printed circuit board, but it's
easier to solder it to the bottom because the bottom solder pad is
larger.
Connect a wire from TP3 to the center pin of the newly added jack. It's a
good idea to use very small diameter coaxial cable, e.g. RG174/U, but
ordinary hookup wire will suffice. If you use hookup wire, connect
another wire from the ground lug of the new jack to a ground pad on the
printed circuit board, or place a solder lug under the nearest screw which
holds the board to the chassis and solder the ground wire to the solder
lug....