
Document 8K088X04 R5.01
Portable Digital Repeater Programming Guide
Page 44 of 86
Repeater
P25 Preamble
Length
7.50-265.00 ms
40 ms
Specifies the duration of bit sync
preamble packets that are sent at
the beginning of all ASTRO
transmissions.
RSSI
RSSI Off
Hysteresis
2-20dB
5 dB
Sets the Received Signal Strength
Indicator Off threshold in dB below
the Received Signal Strength On
Threshold (see Channel
Configuration)
Typically set to 5dB.
RSSI Speed
1-10ms
5ms
Sets the Received Signal Strength
Indicator averaging integration time.
Typically set to 5ms.
Squelch
Squelch Speed
10-150ms
25 ms
Squelch Averaging Integration
Time.
Affects Analog Mode only.
Typical setting is 25ms.
PL STE Duration
120-250ms
140 ms
PL Squelch Tail Elimination Delay.
Must be set to match the portable
setting.
Typical setting is 140ms.
Affects Analog Mode only.
If this field is programmed too
short the squelch tail will not
be fully eliminated. If it is
programmed too long, the
portable may unmute
unnecessarily.
FM Deviation
Audio Limit
12.5kHz
25kHz
25kHz
(NPSPAC)
0.75
–2.52 kHz
2.13 kHz
1.5
– 5.04 kHz
4.26 kHz
1.20-4.03 kHz
3.41 kHz
Typically set to 2.12kHz (12.5kHz
channel spacing) or 4.24 kHz
(25kHz channel spacing or 3.41
kHz (25 kHz NPSPAC channel
spacing).
Affects Analog Mode only.
Depends on the selected
Channel Spacing
– refer to the
Frequency Band Setup
menu.