Kenwood 144, 440 MHz TH-D7A Equipment Connections, Connecting Other External Equipment

Models: 144 440 MHz TH-D7A TH-D7A

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EQUIPMENT CONNECTIONS

EQUIPMENT CONNECTIONS

1CONNECTING EQUIPMENT FOR REMOTE CONTROL

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3Make connections as shown when remotely controlling equipment.

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LockSW

-1 3.9K

-2 10K

-3 27K

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CONNECTING OTHER EXTERNAL EQUIPMENT

When connecting an external speaker, an external microphone, or other equipment such as a TNC for packet radio to the SP jack or MIC jack, refer to the diagram below.

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SW

SW

SW

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Speaker

SP

Ground

Ø2.5

plug

External speaker,

TNC RX, etc.

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SP jack

Ø2.5

External

speaker

 

plug

3.5 V

100 Ω 3.5 V

Ø3.5

switch

plug

10

switch

 

MIC PTT

MIC

PTT

External microphone,

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MIC jack

Ø3.5

 

 

plug

 

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PTT

External

 

 

 

 

 

 

microphone

PTT

Note 1

Note 2 10μF

TNC TX, etc.

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Note 1

Note 2 10 μF

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15Note 1: Voltage is developed across the 100 Ω resistor in the 3.5 V line

16in the transceiver. When 2 mA flows, approximately 3.3 V is developed.

17Note 2: A 10 μF capacitor is not required in the following cases:

18When the other equipment has DC blocking capacitors.

When a 2-terminal electret condenser microphone is used.

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Note 1: Voltage is developed across the 100 Ω resistor in the 3.5 V line in the transceiver. When 2 mA flows, approximately 3.3 V is developed.

Note 2: A 10 μF capacitor is not required in the following cases:

When the other equipment has DC blocking capacitors.

When a 2-terminal electret condenser microphone is used.

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Page 104
Image 104
Kenwood 144, TH-D7A Equipment Connections, Connecting Other External Equipment, 1CONNECTING EQUIPMENT FOR REMOTE CONTROL