MAXON

SP-300 Series HAND HELD

VCO Lock Time

The micro will allow more lock time for the VCO before the out-of-lock beep indication.

Low Battery Indication

Low Battery Indication will be changed so that it does not inhibit RX and will allow one transmission after low cell is indicated. Low cell will not be indicated during transmit mode. If the battery goes below specified limits during the TX mode, low cell will be indicated immediately after releasing the PTT button.

After the low cell indication is issued, the transmitter can only be used one time. When the PTT is pushed again and then released, the transmitter is locked out until the unit is powered down and then powered back up.

Memory Protect

The software is such that if the radio is inadvertently put into program mode it will not lose the contents of the EEPROM memory. Data will only move in and out of the memory when the programmer is attached.

External Option Detect

An input to the microprocessor will be available that will indicate to the microprocessor that the external option has been selected. This input should be connected to the exter- nal option connector. External option should be selected for each channel. If a channel is selected during programming for external option, this input should be active when the channel is selected during operation of the unit.

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May 2001

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Midland Radio SP-300 service manual VCO Lock Time