Icom IC-7000 instruction manual Packet Operation, Packet operation, Adjusting the data speed

PACKET OPERATION 11

■Packet operation

DData socket

		PIN #/NAME	DESCRIPTION
		q DATA IN	Communication data input.
q	w	w GND	Ground for DATA IN, DATA OUT and AF OUT.
e	r		Transmits when grounded.
t	y	e PTTP	When grounded, microphone input (pin 6) of [MIC]
			connector will be disconnected.
Rear panel view		r DATA OUT	Outputs 9600 bps receive data.
		t AF OUT	Outputs 1200 bps receive data.
		y SQL	Squelch output.
			Goes to ground when squelch opens.

DAdjusting the data speed

q Select M-3.

w Push [F-49600] to select the 9600 mode ON and OFF.

• “ ” appears when the 9600 mode is activated.

10

11

[MENU/GRP] [F-4]

DAdjusting the transmit signal output from the TNC

When setting data transmission speed to 9600 bps, the data signal coming from the TNC is applied ex- clusively to the internal limiter circuitry to automati- cally 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-7000.

1.When using a level meter or synchroscope, adjust the TX audio level (DATA IN level) from the TNC as

follows.

0.4 Vp-p (0.2 Vrms): recommended level

0.2–0.5 Vp-p (0.1–0.25 Vrms): acceptable level

2.When not using a measuring device.

➀Connect the IC-7000 to a TNC.

➁Enter a test mode (“CAL”, etc.) on the TNC, then

transmit some test data.

➂When the transceiver fails to transmit test data or

transmits sporadically ([TX] indicator doesn’t light red or blinks):

- Decrease the TNC output level until [TX] indica- tor lights red continuously.

When transmission is not successful even though [TX] indicator lights red continuously:

-Increase the TNC output level.

118