Dcs Tone Search Scanning; Dcs Code Inversion - Yaesu FT-2600M Operating Manual

Operation
(3) When the radio detects the correct tone, it will halt on that tone, and audio will be
allowed to pass.
(4) Press and hold in the [D/MR] key for one second; the CTCSS tone detected will be
stored as the "current" tone, so it may be used for memory storage purposes.
It can be viewed by accessing M
(5) Press and hold in the [MHz] key for one second to exit to normaloperaion.
DCS T S
ONE EARCH
In operating situations where you don't know the DCS code being used by another station, you can
command the radio to listen to the incoming signal and scan in search of the code being used.
Before you begin the DCS Code search, please check the (programmable) setting of the
microphone's [ACC] button (Menu #21); it should be set to "TSRCH" for proper operation.
To scan for the DCS tone in use:
(1) Set the radio up for the DCS operation.
(2) Press the [ACC] button on the microphone momentarily to start scanning for the i n -
coming DCS tone.
(3) When the radio detects the correct code, it halts on that code, and audio is allowed to
pass.
(4) Press and hold in the [D/MR] key for one second; the DCS code detected will be
stored as the "current" code #, so it may be used for memory storage purposes.
It can be viewed by accessing M
(5) Press and hold in the [MHz] key for one second to exit to normal operaion.
DCS C I
ODE NVERSION
DCS uses a codeword consisting of a 23-bit frame, transmitted (subaudible) at a data rate
of 134.4 bps (bit/sec). Occasionally, signal inversion can result in the complement of a
code to be sent or received. This prevents the receiver squelch from opening with DCS
enabled, as the decoded bit sequence does not match that selected for operation.
Typical situations that might cause inversion to occur are:
m Connection of an external receiver preamplifier.
m Operating through a repeater.
m Connection of an external linear amplifier.
Note that unexpected code inversion does not mean that any of the above listed equipment
is defective !
In certain amplifier configurations, the output signal (phase) is inverted from the input.
Small signal or power amplifiers having an odd number (1, 3, 5, etc.) of amplification
stages may result in inversion of a transmitted or received DCS code.
While under most circumstances this should not occur (amplifier designs and industry
28
#31 (TONEF).
ENU
S
CANNING
#10 (DCSN).
ENU
FT-2600M O
PERATING
M
ANUAL