Dcs; P25 Nac - GRE 0716 Owner's Manual

present, or an incorrect tone is found, the receiver will remain
muted. Additionally, the 0716 can detect the CTCSS tone
that is in use on a transmitter, and will allow you to store the tone
value with a CONV object when a CTCSS transmission occurs.
It is possible to hear this tone if you listen with headphones.
CTCSS sounds like a low, steady "hum" in the background of a
voice transmission.

DCS

DCS stands for Digital Coded Squelch. In DCS, the transmitter
sends a special, low level data signal continuously while a
transmission is in progress. This is known as subaudible data -
the level of the data signal is such that the data is difficult or
impossible to hear in a receiver s speaker. The receiver (or your
scanner) will detect and decode this data, and if it matches the
programmed code, the speaker will be unmuted and voice audio
allowed to pass. If the DCS code is not present, or an incorrect
code is found, the receiver will remain muted. Additionally, the
0716 can detect the DCS code that is in use on a transmitter,
and will allow you to store the code value with a CONV object
when a DCS transmission occurs.
It is possible to hear this tone if you listen with headphones. DCS
sounds like a low "purring" in the background of a voice
transmission.

P25 NAC

P25 NAC stands for Project 25 Network Access Code. NAC is a
part of the APCO Project 25 digital radio standard, and works
much like CTCSS or DCS to block undesired transmissions from
a receiver. Project 25 voice information is sent as a series of data
packets, and each packet includes the NAC that has been
configured in the transmitter. A receiver can be programmed to
unmute and play a voice transmission only when the packets
from the transmitter include the correct NAC. Your scanner
operates in the same way. Like CTCSS and DCS, it can detect
the NAC that is in use on a transmitter, and will allow you to store
the code value with a CONV object when a P25 transmission
occurs.
0716 User Manual Page 131