Icom IC-2820H Instruction Manual - Page 143

Adjusting the transmit signal output from, the TNC, Packet operation band selection

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OTHER FUNCTIONS 15 D Adjusting the transmit signal output from the TNC When setting data transmission speed to 9600 bps, the data signal coming from the TNC is applied exclusively to the internal limiter circuitry to automatically maintain band width. NEVER apply data levels from the TNC of over 0.6 V p-p, otherwise the transceiver will not be able to maintain the band width and may possibly interfere with other stations. 1. When using a level meter or oscilloscope, adjust the TX audio output level (DATA IN level) from the TNC as follows. 0.4 V p-p (0.2 V rms) : recommended level 0.2 V p-p-0.5 V p-p (0.1-0.25 V rms) : acceptable level 2. When NOT using a measuring device. q Connect the transceiver to a TNC. w Enter a test mode ("CALL", etc.) on the TNC, then transmit some test data. e When the transceiver fails to transmit the 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 indicator lights continuously: - Increase the TNC output level. D Packet operation band selection 1 Both bands, or either the left or right band only, can be spec- ified for packet operation to suit your preference. 2 q Push [F• ] to display function guide. 3 w Push [MENU](V/MHz•SCAN) (Right band's) to enter MENU 4 screen. e Rotate [DIAL] to select "PACKET" then push 5 [MAIN•BAND]. 6 r Rotate [DIAL] to select "PACKET BAND" then push [MAIN•BAND]. 7 t Rotate [DIAL] to select desired band from MAIN (default), 8 left (L) and right (R), then push [MAIN•BAND]. • MAIN : The main band is used for packet op- 9 eration. 10 • Left (L)/Right (r) : The selected left or right band can only be used for packet operation. 11 y Push [BACK](V/MHz•SCAN) (Right band's) twice to return 12 to frequency indication. 13 14 15 16 17 18 19 122

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122
15
OTHER FUNCTIONS
1
2
3
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5
6
7
8
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10
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19
D
Adjusting the transmit signal output from
the TNC
When setting data transmission speed to 9600 bps, the data
signal coming from the TNC is applied exclusively to the in-
ternal limiter circuitry to automatically maintain band width.
NEVER
apply data levels from the TNC of over 0.6 V p-p, oth-
erwise the transceiver will not be able to maintain the band
width and may possibly interfere with other stations.
1. When using a level meter or oscilloscope, adjust the
TX audio output level (DATA IN level) from the TNC as
follows.
0.4 V p-p (0.2 V rms)
: recommended level
0.2 V p-p–0.5 V p-p (0.1–0.25 V rms)
: acceptable level
2. When NOT using a measuring device.
q
Connect the transceiver to a TNC.
w
Enter a test mode (“CALL”, etc.) on the TNC, then trans-
mit some test data.
e
When the transceiver fails to transmit the test data or
transmits sporadically (TX indicator doesn’t appear or
flashes):
- Decrease the TNC output level until the transmit indi-
cator lights continuously.
When transmission is not successful even though the
TX indicator lights continuously:
- Increase the TNC output level.
D
Packet operation band selection
Both bands, or either the left or right band only, can be spec-
i
fi
ed for packet operation to suit your preference.
q
Push
[
F
•
]
to display function guide.
w
Push
[MENU](V/MHz•SCAN)
(Right band’s)
to enter MENU
screen.
e
Rotate
[DIAL]
to
select
“PACKET”
then
push
[MAIN•BAND]
.
r
Rotate
[DIAL]
to select “PACKET BAND” then push
[MAIN•BAND]
.
t
Rotate
[DIAL]
to select desired band from MAIN
(default)
,
left (L) and right (R), then push
[MAIN•BAND]
.
• MAIN
: The main band is used for packet op-
eration.
• Left (L)/Right (r) : The selected left or right band can only
be used for packet operation.
y
Push
[BACK](V/MHz•SCAN)
(Right band’s)
twice to return
to frequency indication.