APRS® MESSAGE

1The APRS® supports a function for transmitting and

2receiving a message independent of position reports.

3You can transmit a message to a single station only or a bulletin to all other stations in your group. If you specify

4a station, the entered message is transmitted up to 5

5times until a reception acknowledgment is returned.

6Each message which you transmit can consist of up to

745 alphanumeric characters. A maximum of 16 incoming or outgoing messages can be held in the message

8memory.

9

10OPERATION FLOW

11

12The following steps should guide you to a good start of

APRS Message operation.

13

14q Press [TNC] to switch ON the TNC.

15• “” appears.

16w Access Menu 1–4–1 to select band A or B as the

17data band {page 55}.

18

19e On the data band select the same frequency as

20other stations in your group.

21• You may tune to the frequency of an appropriate digipeater {page 72}.

22

23

rAccess Menu 2–1 to program your call sign (9 digits max.) {page 66}.

Now you are ready to receive a message from other stations. Refer to “RECEIVING A MESSAGE” {page 77}. To transmit a message, proceed to step t.

tIf necessary, access Menu 2–8 to program a packet path {page 72}.

yEnter a message (or bulletin) using up to 45 alphanumeric characters {page 79}.

Completing step y causes the transceiver to automatically transmit the message (or bulletin). If you send a message (not a bulletin), a reception acknowledgment should be returned; “ack” appears.

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Kenwood TH-D7A instruction manual Aprs Message, Operation Flow
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TH-D7A specifications

The Kenwood TH-D7A is a sophisticated handheld transceiver designed especially for amateur radio enthusiasts. It combines advanced features with user-friendly operation, making it a popular choice among both beginners and seasoned operators.

One of the standout features of the TH-D7A is its dual-band capability, allowing users to operate on both the 2-meter (144 MHz) and 70-centimeter (440 MHz) bands. This dual-band functionality gives operators increased flexibility and access to a wider range of communication channels. Additionally, the transceiver supports the simultaneous transmission and reception of two different frequencies, allowing for efficient monitoring of multiple communications.

The TH-D7A is equipped with an impressive 1,000 memory channels, which can be organized into 100 memory groups. This allows users to store a vast amount of frequencies and access them easily when needed. The transceiver also provides a wide frequency coverage, extending from 144 to 148 MHz and from 430 to 450 MHz in the VHF and UHF bands, respectively.

Another remarkable feature of the TH-D7A is its built-in Automatic Packet Reporting System (APRS) capabilities. This technology enables users to share real-time location data, send and receive messages, and provide status updates, making it an invaluable tool for outdoor activities and emergency communication.

In terms of construction, the TH-D7A features a durable and compact design, making it suitable for both portable and mobile use. The large, easy-to-read LCD display provides clear visibility in various lighting conditions. Additionally, the transceiver supports a variety of advanced voice modes, including FM, AM, and SSB (Single Side Band), offering a versatile communication experience.

The TH-D7A also incorporates a wide range of digital modes, enhancing its operational capabilities. With the included programming software, users can easily customize their settings, manage memory channels, and update firmware, ensuring the transceiver remains compatible with evolving technologies.

Power management is another highlight, as the TH-D7A provides adjustable output power levels, enabling users to conserve battery life when needed. Overall, the Kenwood TH-D7A is a feature-rich handheld transceiver that combines robust performance with innovative technology, making it a top choice for amateur radio operators seeking reliable communication in diverse environments. Its versatility, combined with its intuitive design, ensures it meets the needs of users across all experience levels.
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