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6 APRS IN ACTION
TM-D710A/E CONTENTS 25
6.1.6 QSY Function
The QSY function uses AFRS (Automatic Frequency Reporting System) to report a frequency on
which voice communications can be established. A station using the QSY function embeds the
frequency information in a position beacon transmission. A receiving station of this information
can change frequency, or QSY, over to the reported voice frequency to begin voice
communication by the press of [TUNE] on the TM-D710A/E.
6.1.6.1 Transmitting QSY Information
A properly configured functioning TM-D710A/E QSY station can automatically embed the voice
frequency from the non-data band to the beginning of status text. In Status 5, “[Freq MHz]” is
entered. This is the mechanism used for automatically transmitting the frequency information.
The format of the transmitted frequency is FFF.FFF MHz.
So, for example, if at the time of a beacon transmission, the non-data band has a frequency of
446.100 MHz selected, then the frequency of “446.100MHz” gets embedded to the beginning of
the status text. If you configure in any of Statuses 1 through 4 the frequency of “446.100MHz” at
the beginning of the status text messages, then this fixed frequency will be transmitted as QSY
information along with the beacon transmission. In addition to frequencies, there are fields where
you can send other settings such as Wide/Narrow, Tone/CTCSS/DCS, Shift (+/-), and Offset
frequency simply by leaving one space between each value. Therefore, other information besides
just a frequency can be sent.
QSY Information Format:
(Insert one space after the frequency before entering Wide/Narrow, Tone/CTCSS/DCS and
Shift/Offset.)
• “T079”: An upper case “T” indicates Wide. Tone frequency of 79.7 Hz. (Encoding)
• “t079”: A lower case “t” indicates Narrow. Tone frequency of 79.7 Hz. (Encoding)
• “tOFF”: A lower case “t” indicates Narrow. Tone = OFF (Without any tone Encoding or Decoding.)
• “C079”: An upper case “C” indicates Wide. CTCSS frequency of 79.7 Hz. (Encoding/
Decoding)
• “c079”: A lower case “c” indicates Narrow. CTCSS frequency of 79.7 Hz. (Encoding/ Decoding)
• “D023”: An upper case “D” indicates Wide. DCS code of 023. (Encoding/ Decoding)
• “d023”: A lower case “d” indicates Narrow. DCS code of 023. (Encoding/ Decoding)
• “+” : Plus Shift (A default offset frequency is applied.)
• “-” : Minus Shift (A default offset frequency is applied.)
• “+500” : Plus Shift, 5MHz Offset (“+5000kHz” is also available)
• “-060”: Minus Shift, 600kHz Offset (“-0600kHz” is also available)
The value of the Offset shall be a 3-digit numeric. (x 10kHz/ 50kHz step)
Note: For detailed information on the QSY Function format, refer to the following link (http://www.ew.usna.edu/~bruninga/
aprs/freqspec.txt). The TM-D710A/E transceiver complies with the standard which was proposed by Bob Bruninga,
WB4APR.