4 RECEIVE AND TRANSMIT
■Packet operation
DConnections for packet
DATA IN | wGND |
q |
PTTP e | r DATA OUT |
y SQ
tAF OUT
DATA
TX AUDIO
GND
TNC SIDE
RX AUDIO
SQL
PTT
Rear panel | TU or TNC |
|
Personal computer
DData socket
qw
e 
r
ty
PIN #/NAME | DESCRIPTION |
qDATA IN Communication data input.
w | GND | Ground for DATA IN, DATA OUT and AF OUT. |
e | PTTP | Transmits when grounded. |
rDATA OUT Outputs 9600 bps receive data.
tAF OUT Outputs 1200 bps receive data.
Rear panel view
y SQ
Squelch output.
Goes to ground when squelch opens.
DAdjusting the transmit signal output from the TNC
| ☞ NOTE: For packet operation the transceiver can | 1. When using a level meter or synchroscope, adjust |
| be set to one of two data speeds: 1200 bps or | the TX audio level (DATA IN level) from the TNC as |
| 9600 bps. Data speed is set in initial set mode | follows. |
| (see p. 54 item 29 9600 MODE). | 0.4 |
| Data speed is set in initial set mode (see p. 53 item | 0.2 |
| acceptable level | |
| 29 9600 MODE).When setting data transmission | |
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| speed to 9600 bps, the DATA signal coming from the | 2. When not using a measuring device. |
| TNC is applied exclusively to the internal limiter cir- | ➀Connect the |
| cuitry to automatically maintain bandwidth. | ➁Enter a test mode (“CAL”, etc.) on the TNC, then |
| NEVER apply data levels from the TNC of over 0.6 | transmit some test data. |
| ➂When the transceiver fails to transmit test data or | |
| maintain the band width and may possibly interfere | transmits sporadically (TX indicator doesn’t appear |
| with other stations. | or flashes): |
| ☞ NOTE: Read the instructions supplied with your | Decrease the TNC output level until the transmit |
| indicator lights continuously. | |
| TNC carefully before attempting packet operation | |
| When transmission is not successful even though | |
| with the | |
| the TX indictor lights continuously: | |
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| Increase the TNC output level. |
37 |
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