Kenwood TM-V708A User Manual - Page 77

Connecting With A Tnc And Personal, Computer

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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 6-pin mini DIN plug on this cable. GND Power supply Power supply Antenna Personal Computer TNC TM-V708A Data terminal PG-5A cable (6-pin mini DIN) Pin No. Pin Name Function Packet data input 1 PKD • 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. • Prevents interference to voice 6 SQC 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 µF capacitor between the PR1 pin and the TNC. Be careful with the polarity of the capacitor. 71

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71
15
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.
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.
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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
6-pin mini DIN plug on this cable.
GND
Power
supply
PG-5A cable
(6-pin mini DIN)
Data
terminal
TM-V708A
TNC
Antenna
Personal
Computer
Power
supply