Midland Radio SP-300 service manual Description of Controls

MAXON

SP-300 HAND HELD

DESCRIPTION OF CONTROLS

The controls, indicators and antenna connections on the VHF and UHF Scanning Handheld Series radios are all located on the top panel. The accessories socket is located on the radio chassis right hand side. The monitor and PTT buttons are located on the radio chassis left hand side.

		ITEM	DESCRIPTION
1. Antenna Connector			1/4" UNEF socket
2.	4 Channel Select Switch		Rotary switch, used to select one of four and to engage in scanning function
3.	16 Channel Select Switch		Rotary switch, used to select one of sixteen and to engage in scanning function
4.	Status Indicator (busy TX/BT)		Tri-colored LED indicator
5.	ON/OFF Volume Control		Main power switch and volume control. Fully counter-clockwise is OFF position
6.	Battery Lock		Used to lock the battery in place
7.	Push-To-Talk Button		Push to talk, release to listen
8.	Monitor Button		When pressed, monitors the chosen channel
9.	Option		Used for controlling installed external option
10.		Speaker	Sound reception
11. Microphone			Sound transmission
12.		External Speaker	Socket used for external microphone with speaker
13.		Belt Clip	Belt Clip
14.		Battery	Power Supply
15.		Battery Charger Contacts	Contacts used for charging battery
16.		VHF Antenna	Antenna
17.		UHF Antenna	Antenna

ANT	CH	VOL	ANT	CH	VOL
	4		7		11
	3
			4
	2				13
	1		1
				16

1 2 3 4 5

7

8

9

CON701 Pinouts		CON701 - Pin 1
Pin	Function
1	Data
2	Clock
3	N/C
4	+7.5V
5	N/C
6	N/C
7	Gnd
8	Mic+
9	N/C
10	Int_Spkr_Mic_Dsbl
11	Spkr+
12	N/C

13	16
12

10 maxon

11

14

17

6

15

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May 2001