I Packet Operation; D Data Socket; D Adjusting The Transmit Signal Output From The Tnc - Icom I706MKTMG Instruction Manual

4
RECEIVE AND TRANSMIT

I Packet operation

D Connections for packet
PTTP
Rear panel

D Data socket

q w
e
t y
Rear panel view

D Adjusting the transmit signal output from the TNC

NOTE: For packet operation the transceiver can
be set to one of two data speeds: 1200 bps or
9600 bps. Data speed is set in initial set mode
(see p. 54 item 29 9600 MODE).
Data speed is set in initial set mode (see p. 53 item
29 9600 MODE).When setting data transmission
speed to 9600 bps, the
TNC is applied exclusively to the internal limiter cir-
cuitry to automatically maintain bandwidth.
NEVER apply data levels from the TNC of over 0.6
Vp-p, otherwise the transceiver will not be able to
maintain the band width and may possibly interfere
with other stations.
NOTE: Read the instructions supplied with your
TNC carefully before attempting packet operation
with the IC-706MKIIG.
37
DATA IN
q w
GND
e r DATA OUT
y SQ
t
AF OUT
DATA
PIN #/NAME
q DATA IN
w GND
e PTTP
r
r DATA OUT
t AF OUT
y SQ
signal coming from the
DATA
TX AUDIO
GND
TNC SIDE
RX AUDIO
SQL
PTT
RS-232C
TU or TNC
DESCRIPTION
Communication data input.
Ground for DATA IN, DATA OUT and AF OUT.
Transmits when grounded.
Outputs 9600 bps receive data.
Outputs 1200 bps receive data.
Squelch output.
Goes to ground when squelch opens.
1. When using a level meter or synchroscope, adjust
the TX audio level (
follows.
0.4 Vp-p (0.2 Vrms): recommended level
0.2 Vp-p–0.5 Vp-p (0.1 Vrms–0.25 Vrms):
acceptable level
2. When not using a measuring device.
➀
Connect the IC-706MKIIG to a TNC.
➁
Enter a test mode ("CAL", etc.) on the TNC, then
transmit some test data.
➂
When the transceiver fails to transmit test data or
transmits sporadically (TX indicator doesn't appear
or flashes):
Decrease the TNC output level until the transmit
indicator lights continuously.
When transmission is not successful even though
the TX indictor lights continuously:
Increase the TNC output level.
Personal computer
level) from the TNC as
DATA IN