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October, 1996 6880902Z36-B

5-3

GM300 Radio Service Software Manual Scanning Features

Scan Features

Priority Sampling Method

RSS LOCATION

DEFINITION

Determines the way in which the priority channel(s) is checked for activity during

a “lookback” from an active second priority or non-priority channel.

DEFAULT/CHOICES Default: Continuous

Choices:

■

Continuous

■

1-SHOT PL

Continuous

Continuous always performs a complete check of the channel. If no

carrier is present, then the sampling ends. If a carrier is present, a

full PL check is made on each sample.

1-Shot PL

For 1-Shot PL, once a carrier is seen, a full PL sample is only done

once until a sample is seen with no carrier present (that is, a carrier

“break”). See PIX.

RECOMMENDATIONS

Almost always use Continuous. Use 1-Shot PL to reduce hole size on shared chan-

nels (for example, community repeaters, timeouts). Your best advantage occurs if

you reduce the priority sampling rate when using 1-Shot PL.

WARNINGS

There is a risk that messages will be lost on the priority channel. Use Continuous

for critical priority channels (public safety, etc.).

IMPORTANT NOTE

Best performance of 1-Shot PL is attained on a well-controlled channel, since a

wide carrier break is needed to reduce lost priority activity. Your repeater panel

may have an access timer that will help. Busy Channel Lockout on all radios will

help.

Radius GM300 User Manual

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