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BX-7300 • 180403

Automatic Antenna Selector

Commissioning

Commissioning and functions
testing

First, for commissioning, a jumper lead is connected to posi-
tion 1 of the two pole connector strip J2 and the FA-AS, by
way of the assembled DC cable and power supply
(13.8V/ 0.2A) is powered up. As long as the working voltage
is attached the microprocessor starts to work. This is con-
firmed by the short relay clicking and the subsequent flash-
ing of the LED’s. We’ll go into this again later.
Where all remains quiet and unlit then we have a wealth of
working voltages to check. 13V and 5V must be found at the
check points on the main board. If not then perhaps the fuse
is defective or not sitting correctly in its holder. Hook up a
transceiver or receiver to the antenna socket 1 and set the
frequency to 18.4320MHz in CW mode and a (faint)
tone should be heard. This is the sign that the microproces-
sor is working. If nothing is heard then it could be a defec-
tive quartz Q1 or one of its connections shorting to earth.
Before the commissioning can continue the aforementioned
“vital signs” of the microprocessor both audible and visible
must be present otherwise there is the task of finding and re-
placing the failed component.
If everything up to this point is in order then the FA-AS can
be disconnected from the power supply and the jumper wire
removed. Picture 30 shows how the connection of the FA-
AS to the transceiver and peripherals should be, for commis-
sioning only the pair of cables shown on the left hand side
are of interest.

Test of control by line voltage

Connect the FA-AS and the (powered down) Icom trans -
ceiver with the prepared control cable. There should be no
jumper leads plugged into the J2 connector strip. The appara-
tus now finds itself in test mode, where it will now check the
band information delivered from the transceiver and pro-
cessed by the microprocessor. This mode can also be useful
in some failure events. In test mode antennas will not be se-
lected or stored. The bi coloured LED’s on the front panel,
having nothing to do with antennas 1 to 4, now serve sepa-
rately as indicators. Immediately after switching on the
transceiver the FA-AS will also be powered up over
the control cable with 13.8V working voltage (see paragraph
‘

assembly of control cables

’). LED 1 briefly lights up and

thereby signals the running through of the initialisation phase
of the programme, after which, in test mode, a precise com-
bination of LED’s light up in accordance with the applied
line voltage. This is set out in table 2.
Switching the transceiver to one of the amateur bands the ap-
propriate LED’s on the FA-AS must light up. At the test point
BSP (near the fuse holder) measure the line voltage delivered
from the transceiver against earth (test point M). This should
be within the range given by Ubsp in table 2. Of note is that
the WARC bands and the neighbouring classic bands are

Table 4. Set specific CI V address of some Icom
transceivers.

Transceiver CIV address

IC-7300 94H

IC-7200 76H

IC-7100 88H

IC-7000 70H

IC-7410 80H

IC-718 5EH

IC-706MKIIG 58H

IC-7400 66H

IC-756ProIII 6EH

IC-761 1EH