Kenwood TM-D710E User Manual 3 - Page 52
Aprs-12, Qsy Function, Setting Packet Filter
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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 select of [TUNE]. Transmitting QSY Information A properly configured functioning TM-D710 QSY station can automatically embed the voice frequency from the non-data band to the beginning of status text. 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, 5 MHz Offset • "-060": Minus Shift, 600 kHz Offset The value of the Offset shall be a 3-digit number. (x 10 kHz/ 50 kHz step) ■ Operation when Receiving a QSY 1 Select text setting number 5. • Frequency information is imbedded to the first 10 characters of the status text message. 2 Enter the status text message. 3 When QSY (frequency) information is received, the station list appears (list summary and details) with the verified frequency. Press [TUNE]. • The QSY (frequency) is set to the non data band. Note: When using 6.5 kHz or 12.5 kHz step values, the display does not indicate values for 100 Hz and lower. SETTING PACKET FILTER Enter Menu mode and access Menu 609. ■ Position Limit If APRS is popular in your area, you may receive too many APRS packets for a short period. If this disturbs your APRS activities, specify a distance from your location. You will not receive APRS packets from stations beyond this distance. Select the range from 10 to 2500 in steps of 10, plus OFF (default). The unit is mile or kilometer depending on the selection in Menu 626 (DISPLAY UNIT 1). ■ Packet Filter Type The APRS position data is filtered. • Check the type(s) you want to receive. • If all types are checked, you will receive all types of data. Refer to the website for QSY Information Format: http://aprs.org/info/freqspec.txt (as of April 2013) APRS-12