Connecting with a Personal Computer

You can use an optional PG-4W cable to connect the transceiver with a personal computer. For this cable, contact your authorized KENWOOD dealer.

Note: Turn OFF the transceiver power before making the connection.

OPERATING TNC

This transceiver has a built-in TNC which conforms to the AX.25 protocol. This protocol is used for communications between TNCs. The TNC accepts data from your personal computer and assembles it into packets. It then converts packets to audio tones which the transceiver can transmit. The TNC also takes audio tones from the transceiver, converts them to data for the computer, and checks for errors in the data.

To PC jack

PG-4W

2.5mm (1/10") 3-conductor plug

RXD2

TXD1 GND3

1To RXD on PC

2To TXD on PC

3To GND on PC

To COM port

DB-9 connector

Pin No.

Pin Name

tGND

eTXD

wRXD

The TNC mainly functions in Command or Converse mode. First learn the difference between these two modes.

•	Command mode
	When you select Packet mode, the TNC enters this
	mode. A “cmd:” prompt appears on the computer
	screen. You can type commands from the computer
	keyboard to change the settings on the TNC. When
	in Converse mode, press [Ctrl]+[C] on the keyboard
	to restore the Command mode.
•	Converse mode
	The TNC enters this mode when a linkage with the
	target station is established. On the computer
	keyboard, type an appropriate command and if
	necessary a message, then press [Enter] or
	[Return]. What you type is converted into packets

Note: When the built-in TNC is ON, some internal frequency relationships may induce an internal heterodyne and cause the squelch to be opened unexpectedly. Shifting the interference will solve this problem. Press [TNC]+ POWER ON to access “BEAT SHIFT”. Press [UP]/ [DWN] to select “UPPER”. Press [OK] to complete the setting. The default is “NORMAL”.

and transmitted over the air. When in Command

mode, type CONVERSE to restore the Converse

mode; you can also type CONV or K instead.

For the commands supported by the built-in TNC, see “TNC COMMANDS LIST” on page 99.

144, 440 MHz TH-D7A, 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.

Kenwood 440 MHz TH-D7A, 144 Connecting with a Personal Computer, Operating TNC, Command mode

Models: 144 440 MHz TH-D7A TH-D7A

CONNECTING WITH A PERSONAL COMPUTER

OPERATING TNC

Command mode

Converse mode

144, 440 MHz TH-D7A, TH-D7A specifications