User's Manual Part 2

58
Maintenance / Reference
Problem
Packet
communication does
not function.
APRS does not
function.
The unit does not
enter V-V/U-U mode.
Possible Causes
a. TNC is not connected or set
properly.
b. The unit is not in the packet
mode.
c. The squelch is open.
d. The data transmission speed
is not configured.
e. A PC cable other than the
straight type is used.
a. The unit is not in the packet
mode.
b. The unit is not configured for
automatic transmission.
c. The squelch is open.
d. The GPS receiver is not
geolocating.
Either the MAIN or SUB side is
in memory mode.
Potential Solutions
a. Make sure the connections and
configurations are properly set.
b. Switch to the packet mode.
c. Adjust the squelch level where it
will open by a reception signal.
d. Adjust the speed by the PC.
e. Use a straight type PC cable.
a. Switch to the packet mode.
b. Use the PC to set transmission
time separation.
c. Adjust the squelch level where it
will open by a reception signal.
d. Wait until the GPS receiver
properly geolocates.
Switch to VFO mode.
IMPORTANT: When reception frequencies fall in any one of the formulas below, the unit may
receive non-modulated signal.
This is due to the structure of frequencies of this unit and not a malfunction of the
unit.
• (Reception frequency on the MAIN side - 45.1MHz )
: Reception frequency on the SUB side - 43.4MHz (In u-u)
• (FM reception frequency + 10.7MHz x 4) : UHF reception frequency - 90.2MHz
• (FM reception frequency + 10.7MHz x 5) :UHF reception frequency
• (Reception frequency in the UHF band - 45.1MHz) x 2
- (Reception frequency in the VHF band - 21.7MHz) x 6 : 45.1MHz
• EMS-57 DTMF equipped microphone
(This comes standard with the DR-620T)
• EJ-50U TNC unit
Optional accessories
• EMS-53 Microphone
(This comes standard with the DR-620E)