INTERFACING TO PERIPHERALS
42
SP/MIC JACK
The SP/MIC jack on the transceiver can be
configured to interface to various kind of the
peripherals available for the transceiver, such as a
speaker microphone (SMC-32/ 33/ 34), PC interface
cable and a TNC. Access Menu No. 9 (SP/MIC
JACK) and select the peripheral type from “SP/MIC”,
“TNC”, and “PC”.
You can further configure the transceiver to interface
to a high speed (9600 bps) TNC that requires a direct
FM modulation {below}.
SELECTING SP/MIC JACK FUNCTION
Unless you connect the transceiver to a TNC or PC,
the default setting of the SP/MIC jack function (Menu
No. 9), “SP/MIC” works fine. However, if you want to
interface to a different type of peripheral, configure
the SP/MIC jack function:
1
Press
[MNU]
to enter Menu mode.
2
Turn the
Tuning
control or press
[ ]
/
[ ]
to select
Menu No. 9 (SP/MIC JACK).
3
Press
[ ]
or
[MNU]
.
4
Turn the
Tuning
control or press
[ ]
/
[ ]
to select
the appropriate peripheral type from “SP/MIC”
(default), “TNC”, and “PC”.
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5
Press
[ ]
or
[MNU]
to store the setting.
Otherwise, press
[ ]
or
[PTT]
to cancel.
•
If necessary, configure and select the
additional settings.
6
Press
[ ]
(POWER) to turn the transceiver OFF.
7
Connect a peripheral to the SP/MIC jack.
8
Press
[ ]
(POWER) to turn the transceiver ON.
■
SP/MIC
If you plug the speaker microphone or headset
into the SP/MIC jack, access Menu No. 9 and
select “SP/MIC” (default). To emulate the
programmable function keys using external keys in
order to control the transceiver, refer to the circuit
diagram below.
3.5 V
10
µ
F
PTT
LOCK SW
SW-1 3.9k
SW-2 10k
SW-3 27k
TH-F7A
SP
MIC
Note 1:
Voltage is developed across a 100W resistor on the 3.5 V line in
the transceiver. When 2 mA flows, approximately 3.3 V is
developed.
Note 2:
A 10 mF capacitor is not required in the following cases.
•
When other equipment has DC blocking capacitors.
•
When a 2-terminal electret condenser microphone is used.
■
TNC
If you want to utilize the squelch status on your
TNC, access Menu No. 9 and select “TNC”. From
the TNC, make the interface cable that connects to
SP/PRD, MIC/PKD, PTT, REM/SQ, and GND on
the transceiver SP/MIC jack terminal. In addition,
if your TNC supports 9600 bps packet (G3RUH/
GMSK 9600 bps modem), access Menu No. 28
(PACKET) and select “9600” bps. This option
allows you to transmit/ receive packet signals in a
direct FM modulation/ quadrature detector output.
You must use the A-band to transmit and receive
9600 bps packet signal.
The following diagram shows the available
terminals on the SP/MIC jack for the TNC.
To TNC RX
audio input
To TNC
DCD input
GND
NC
To TNC TX
audio output
PTT
Demodulator output
Modulation input
Speaker output
Remote input
Squelch output
Microphone input
PTT input
3.5 V DC
High speed
(9600 bps)
High speed
(9600 bps)
Normal
(1200 bps)
Normal
(1200 bps)
SP/PRD
REM/SQ
GND
3.5 V
MIC/PKD
PTT
Note:
◆
When you select 9600 bps for Menu No. 28 (PACKET), you
cannot monitor the sound from the speaker. Select 1200 bps
for Menu No. 28 (PACKET) when you return to normal
operation.
◆
While the VOX function is turned ON, Menu No. 28 (PACKET)
returns to 1200 bps {page 39}.
2.5 mm
Plug
3.5 mm
Plug
Speaker
Microphone
3.5 mm
Plug
2.5 mm
Plug
Note 1
Note 2
Содержание TH-F7A
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