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Note:
◆
If the TX delay of your TNC is not long enough, connection errors
may occur. If connection errors frequently occur, it is recommended
to set the TX delay parameter on the TNC to 300 ms by using your
computer.
◆
Using a modulator input level that is far different from the optimum
40 mV
P-P
or 2 V
P-P
specifications may result in deterioration of the S/N
ratio or signal distortion. This could result in increased errors or a
complete failure to connect with other stations.
◆
If the modulator input level exceeds approximately 3 V
P-P
the limiter
circuit functions to maintain the same transmit bandwidth as that of
3V
P-P
.
◆
Packet operation, easily affected by transmit and receive conditions,
requires a full-scale S-meter reading for reliable communication.
When the S-meter reads less than maximum during 9600 bps
operation, communication errors are frequent.
◆
Inputting 9600 bps GMSK signals at too high a level or inputting
significantly distorted signals into the transceiver can cause errors
and a wide transmit bandwidth that may interfere with other stations.
■ DATA Connector Pin Functions
This section describes each pin of the DATA connector
equipped on this transceiver.
DATA connector
E (GND)
•
•
•
•
•
•
Pin
Name
Pin
No.
Function
PKD
DE
PKS
PR9
PR1
SQC
1
2
3
4
5
6
Packet data input
TX data from TNC to transceiver
Ground for PKD
Packet standby
TNC can use this pin to inhibit the
transceiver microphone input while
transmitting packet signals.
Output of detected 9600 bps data
(500 mVP-P, 10 kΩ)
Also functions as a common pin for
1200 bps and 9600 bps data output.
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
communications on the same
frequency. Also prevents retries.
Output Level
Open squelch: +5 V (High)
Closed squelch: 0 V (Low)
Note:
◆
If your 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.
◆
When DC voltage is input to the PR1 pin, the TNC may not function.
If this problem happens, add a 10
µ
F capacitor between the PR1 pin
and the TNC. Be careful about the polarity of the capacitor.