CONNECTING WITH A TNC AND PERSONAL COMPUTER

Note:

◆Turn the transceiver power OFF before making any connections.

◆Do not share a single power supply between the transceiver and the TNC.

◆Keep as wide a separation as possible between the transceiver and the computer, to reduce noise-pickup by the transceiver.

To connect an external TNC to the

 

 

transceiver, use an optional PG-5A

 

 

cable. The DATA connector on the

 

 

front of the main unit mates with the

 

GND

6-pin mini DIN plug on this cable.

 

Power￿

Power￿

Antenna

supply

supply

 

 

TNC

 

Personal￿

TM-V708A

Data￿

Computer

 

terminal

 

 

 

PG-5A cable￿

 

 

(6-pin mini DIN)

 

Pin No.

Pin Name

Function

 

1

PKD

Packet data input

 

• TX data from TNC to transceiver.

 

 

 

 

 

 

 

 

2

DE

Ground for PKD

 

 

 

 

 

 

 

Packet standby

 

3

PKS

• TNC can use this pin to inhibit the

 

 

 

transceiver microphone input while

 

 

 

transmitting packet signals.

 

 

 

 

 

 

 

Output of detected 9600 bps data

 

4

PR9

(500 mVP-P, 10 kΩ)

 

• Also functions as a common pin for

 

 

 

 

 

 

1200 bps and 9600 bps data output.

 

 

 

 

 

5

PR1

Output of detected 1200 bps data

 

(500 mVP-P, 10 kΩ)

 

 

 

 

 

 

 

 

 

 

Squelch control output

 

 

 

• Inhibits TNC data transmitting while

 

 

 

transceiver squelch is open.

 

6

SQC

• Prevents interference to voice

 

communications on the same

 

 

 

frequency. Also prevents retries.

15

 

 

• Output Level

 

 

 

 

 

Open squelch: +5 V (High)

 

 

 

Closed squelch: 0 V (Low)

 

 

 

 

 

Note:

◆If the external TNC has a common pin for 1200 bps and 9600 bps data input, connect this pin to the DATA connector PR9 pin. Shorting the PR9 and PR1 pins will cause the TNC to malfunction.

◆If DC voltage is input to the PR1 pin, the external TNC may not function. If this problem happens, add a 10 ∝F capacitor between the PR1 pin and the TNC. Be careful with the polarity of the capacitor.

71

Page 76 Page 78
Page 77
Image 77
Kenwood TM-V708A instruction manual Connecting with a TNC and Personal Computer, Function
Page 76 Page 78

TM-V708A specifications

The Kenwood TM-V708A is a versatile and powerful dual-band transceiver that caters to amateur radio enthusiasts seeking advanced communication capabilities. Designed for operation in the 144 MHz and 440 MHz bands, this mobile radio provides exceptional performance in various modes, making it ideal for both casual users and serious operators alike.

One of the standout features of the TM-V708A is its ability to operate in both VHF and UHF frequencies simultaneous, enabling users to monitor multiple channels at once. With a powerful output of up to 50 watts on VHF and 35 watts on UHF, the TM-V708A ensures strong, clear signals that can reach distant stations. The user-friendly interface includes a large display that provides clear readings of the frequency and other operational parameters, enhancing the overall experience for operators.

The Kenwood TM-V708A is equipped with advanced digital signal processing (DSP) technology. This feature minimizes background noise, ensuring that voice communications remain crystal clear even in challenging conditions. The built-in CTCSS and DCS capabilities add further functionality, allowing for selective calling and improved privacy during conversations.

This transceiver comes with a wide range of operating modes. It supports FM, AM, and SSB, providing flexibility based on operator preference and environmental conditions. Furthermore, the inclusion of APRS (Automatic Packet Reporting System) capabilities allows for real-time tracking and position reporting, making it an excellent tool for emergencies and outdoor adventures.

Another notable characteristic is its built-in memory. The TM-V708A can store a substantial number of memory channels, allowing users to quickly access their preferred frequencies. Additionally, the dual-receive function permits the monitoring of two different frequencies simultaneously, providing seamless communication in dynamic environments.

For enhanced usability, the TM-V708A includes multiple connectivity options. It features a variety of ports for connecting external equipment, allowing operators to customize their setup according to their specific needs. The unit also balances robust performance with portability, making it suitable for both mobile and stationary use.

In summary, the Kenwood TM-V708A is a powerful and feature-rich transceiver that combines advanced technologies and user-friendly design. Its dual-band capabilities, robust power output, and extensive operational modes make it an invaluable tool for amateur radio operators seeking to enhance their communication experience. Whether for casual chatting or emergency response, the TM-V708A stands as a premier choice in the market.
Top Page Image Contents