Icom IC-703 Installing Manual

Installing a LIF port into the IC-703 transceiver
Introduction
This document describes the procedure for installing a LIF (Low Intermediate
Frequency [9 – 18kHz]) port into the FT-950 transceiver. This procedure requires
a level of expertise sufficient to dismantle the transceiver and to solder.
Nonetheless, the installation is straight forward and should not cause any
difficulties for the experienced radio amateur.
It is important to unplug all connectors and power before working on any
transceiver. It is also important to be grounded to avoid static discharges.
Please note: no responsibility or liability will be taken by the author of this
document for any damage or malfunction caused by user modifications.
LIF port installation
Dismantling the Transceiver
The top cover of the radio must be removed. There are 8 screws that need
to be removed and then the lid will come loose. Remove the lid carefully
because the speaker cable will still be connected to the circuit board.
Unplug the speaker. Now remove all the screws that hold down the PCB
(9 in total). The three white ribbon cables have to be unplugged by slightly
pulling on them. The two coaxial cables in back have to be gently
unplugged. Now the board can be twisted out, starting at the front.
Drilling the Hole
A SMA connector is the preferred connector because of its small size. A
BNC or a RCA connector will also work in the case that a SMA connector
is not available. A hole will need to be drilled next to the phone plug for the
Morse key. Make sure the hole clears the screw stud and is high enough
to allow space for the coaxial cables.
Before drilling the hole, cover all the cutouts to the lower PCB with
masking tape to prevent metal shavings from falling into the lower part of
the transceiver. Blow out the metal dust and clean the surfaces of all dust
before reassembling.