Midland Radio service manual SP-300INTRODUCTION, Features

SP-300INTRODUCTION

The SP-300 Series of portable radios from Maxon, utilizes the latest technology in its design and manufacturing. Both the VHF and UHF models are PLL (Phase Lock Loop Syn- thesizer) / microprocessor controlled, and offer 1 or 5 watts of power with 4 & 16 channel capability. Multiple functions including Scan, CTCSS / DCS signaling and 12.5 & 25 kHz channel spacing are standard in these fully programmable wide bandwidth handheld units.

MAXON

SP-300 Series HAND HELD

FEATURES

Main Features

•Wideband

•Scan Mode

•Busy Channel Lockout/Marked Idle Enable

•Standard/Non-Standard CTCSS/DCS Signaling

•Transmit Time-Out Timer/Tx Inhibit

•Beep Tone Enable/Disable

•Low Battery Indication

•Memory Protect

•External Option Detect

•5/1 Watts Programmable RF Power

•Battery Save Circuitry

•Locking Accessory Connector

Wideband

This software is made to work and control the wide band receiver/transmitter boards.

Scan Mode

During programming of the radio, any channel can be selected as a scanned channel. When a channel is selected as a scanned channel, it becomes part of the scan list. The scan list will be activated by switching to the channel that was selected as the scan channel during programming of the sys- tem parameters.

The channel that was selected as the scan channel can still be used as a receive only channel when in scan mode or receive and transmit channel if the channel has been programmed for “Priority Scan TX”.

Scan Channel Delete

When the unit is in scan mode the monitor button can be pushed to delete a channel from the scan list. If the monitor button is pushed while scanning has stopped to monitor an active channel, that channel will be deleted from the scan list. The channel will remain inactive in the scan list until the scan mode is re-initiated by switching off the scan list channel and switching back to the scan list channel. Any number of channels can be deleted from the scan list in this way. The scan list is always initiated with all the scan list channels active.

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May 2001