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Concerning the received frequency display, an unmodulated signal may be
received. This is according to the set intrinsic frequency form.
<A band> <B band>
VxU reception
(144 MHz + 49.95 MHz) x 2
– (430 MHz - 45.05 MHz) =
45.05 MHz, 49.95 MHz
(144 MHz + 49.95 MHz) x 4
–
(430 MHz - 45.05 MHz) x 2
=
45.05 MHz, 49.95 MHz
UxV reception
(430 MHz - 49.95 MHz) –
(144 MHz + 45.05 MHz) x 2
=
45.05 MHz, 49.95 MHz
(430 MHz - 49.95 MHz) x 2
–
(144 MHz + 45.05 MHz) x 4
=
45.05 MHz, 49.95 MHz
GPS setting: 16.369 MHz x n (n = multiple)
Problem Probable Cause Corrective Action
When using a GPS
receiver, you cannot
correctly transmit
position data.
The GPS receiver did
not yet start correct
measurement.
Before starting correct
measurement, the GPS
receiver generates a low-
pitch tone every 10 seconds.
When starting correct
measurement, it generates a
high-pitch tone. (If not using
the internal GPS receiver,
press [F], [MARK] and
select “OFF”).
You cannot receive any
APRS data.
You did not correctly
program a group code.
Access Menu 3S0 and
program “APK003”.
“MCP ERR” appears on
the display. (MCP-4A
communications error)
1 Loose cable
connection.
2 Your PC may be
trying to process too
much at once.
3 There are other
reasons as to why
communications was
not possible.
1 Ensure that the connection
between the TH-D72 and
the PC is correct.
2 Shut down other software
that you may be running.
3 Turn the TH-D72 power
source OFF and ON, one
time.