Kenwood TH-F6A, TH-F7E Interfacing to Peripherals, Selecting SP/MIC Jack Function, Sp/Mic

INTERFACING TO PERIPHERALS

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”.

■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 {page 38}.

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).

SP

TH-F6A/ TH-F7E

MIC

Note 1:

LOCK SW	SW-1 3.9k	SW-2 10k	SW-3 27k
2.5 mm
Plug

Speaker

	3.5 mm	PTT
	Plug
3.5 V	10 ∝F	Microphone
Note 1	Note 2

3	Press [ ] or [MNU].
4	Turn the Tuning control or press [ ]/ [ ] to select
	the appropriate peripheral type from “SP/MIC”
	(default), “TNC”, and “PC”.

SP/MIC	Peripheral Type
Function
	Speaker microhone, headset,
SP/MIC	earphone, TNC without a squelch
	status support
TNC	TNC with a squelch status support
PC	PC with the memory channel control
	software for the transceiver

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.

Voltage is developed across a 100Ω resistor on the 3.5 V line in the transceiver. When 2 mA flows, approximately 3.3 V is developed.

Note 2:

A 10 ∝F 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.

7 Connect a peripheral to the SP/MIC jack.

Demodulator output

High speed (9600 bps)

To TNC RX audio input

8 Press [ ] (POWER) to turn the transceiver ON.

Speaker output

NormalSP/PRD

(1200 bps)

Remote input REM/SQ GND

Squelch output

3.5 V DC	3.5 V
	High speed
Modulation input	(9600 bps)
	MIC/PKD
Microphone input	PTT
	Normal
PTT input	(1200 bps)

To TNC DCD input

2.5mm

Plug

GND

NC

3.5mm

Plug

PTT

To TNC TX audio output

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 41}.

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