3 APRS
23
Disclosing Audio Standby Frequency (QSY Feature)
3.1.3
APRS makes use of a wide-band data frequency, which basically cannot be used for audio
communication. Therefore, disclosing the frequency that can be used for audio
communication helps to facilitate the communication process. For example, during
communication at remote locations such as in a mountain, announcing the frequency for
audio communication via the APRS beacon makes it easier to establish communication with
a nearby amateur radio station.
Let us look at how we can carry out audio communication on band A and APRS data
communication on band B. In general, positional information on of one's own station is
transmitted periodically as an APRS beacon in the case of band B. In this case, it is
possible to embed the frequency information of a non-data band (band A in this example) in
the APRS data. This is known as the QSY feature.
When sending out information such as like that of the a audio repeater and or EchoLink as
QSY information, information on
Tone/ Shift/ Wide
can also be appended applied as
needed in addition to the frequency information.
"
F
" is displayed when APRS received data that contains QSY information. The user at the
radio station that has received the data can operate the
“Tune”
function to shift the
non-data band to the VFO mode, which enables the frequency to be adjusted automatically
according to the audio frequency of the other station.
Sending out QSY information in this way by this method easy and very certain way of
shifting the other station to the audio communication channel.
Disclosing D-STAR Standby Information with the QSY Feature (New Feature)
3.1.4
The TH-D74A/E also allows disclosure of the D-STAR standby information using the QSY
feature.
Operating the
“Tune”
function of the station that has received the D-STAR standby
information enables the information of the station to be adjusted automatically according to
the D-STAR configuration information of the transmitting station.
For example, during D-STAR audio communication on band A and APRS data
communication on band B, the frequency of a non-data band (band A in this example) and
the D-STAR access repeater Callsign can be embedded in the APRS data and transmitted
as a beacon.
If the
DR mode
of D-STAR is configured, APRS data that is embedded with the access
repeater Callsign of one's own station will be transmitted. By operating the
“Tune”
function
of the station that has received this APRS data, the non-data band switches to the
DR mode
and enters the gateway CQ state, and the access repeater Callsign of the receiving station
is configured to
TO Call
.
If the
DV mode
of D-STAR is configured, the repeater Callsign is not embedded in the
APRS data as a repeater is not used (the frequency information is embedded). The user at
the radio station that has received the APRS data can operate the
“Tune”
function to shift
the non-data band to the
DV mode
, which enables the VFO frequency to be adjusted
automatically according to the standby frequency of the other station.
