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13
OTHER FUNCTIONS
D
Packet jack pin assignment
Rear panel view
w
y
r
q
e
t
q
DATA IN
Input terminal for data transmit. See previous page for de-
tails on how to toggle data speed between 1200
(AFSK)
and 9600 bps
(G3RUH, GMSK)
.
w
GND
Common ground for DATA IN, DATA OUT and AF OUT.
e
PTT P
PTT terminal for packet operation only. Connect ground to
transmit data.
r
DATA OUT
Data out terminal for 9600 bps operation only.
t
AF OUT
Data out terminal for 1200 bps operation only.
y
P SQL
Output is high (+5 V) when the transceiver receives a sig-
nal which opens the squelch.
• To avoid unnecessary TNC transmission, connect squelch to the
TNC to inhibit transmission when receiving signals.
• Keep audio output at a normal level, otherwise a “P SQL” signal
will not be output.
D
1200 bps packet operation
q
Connect the transceiver and a TNC as illustrated below.
SQL
PTT
RX AUDIO
GND
TX AUDIO
TNC side
q
DATA IN
w
GND
e
PTT P
t
AF
y
P SQL
w
Set the TNC for transmit.
e
Set transmit delay on the TNC to 50–100 msec., if
available.
r
Adjust the TNC frequency deviation if necessary.
•
When using a deviation meter:
Adjust the output of the TNC so that frequency deviation
is in the range ±3 to ±4 kHz.
•
When NOT using a deviation meter:
A receiver or transceiver is needed to monitor the
transmission—compare the received audio output level
when receiving a TNC modulated signal with high level
voice signals using the microphone. Then adjust the
TNC modulated signal to a lower level than the voice
modulated signal.
Summary of Contents for ID-E880
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