Dcs Code Inversion - Yaesu FT-8800R Operating Manual

DCS Code Inversion

The system was first introduced in the commercial
DCS
where it is now in widespread use.
names, such as
DPL
uses a codeword consisting of a 23-bit frame, transmitted (subaudible) at a data rate of
DCS
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
decoded bit sequence would not match that selected for the operation.
Typical situations that might cause inversion to occur are: connection of an external receiver
preamplifier, operating through a repeater, and connection of an external linear amplifier.
Note that 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
While under most circumstances this should not occur (amplifier designs and industry
standards take this into account), if you find that your receiver squelch does not open when
both you and the other station are using a common
both) can try the following:
1. Press the
2. Rotate the
3. Press the
mode:
•
TRX N
•
RX R
•
TX R
•
TRX R
4. Press and hold in the
to normal operation.
Remember to restore the default setting to TRX N (Encoder; Normal,
Decoder; Normal) when done.
Yaesu FT-8800R Operating Manual (courtesy of W5JCK)
is sometime referred to by its different proprietary
DCS
® (
Digital Private Line
key momentarily to enter the
SET
knob to select
DIAL
knob momentarily, then rotate the
DIAL
: Encoder; Normal, Decoder; Normal
: Encoder; Normal, Decoder; Reverse (Inverted)
: Encoder; Reverse (Inverted), Decoder; Normal
: Encoder; Reverse (Inverted), Decoder; Reverse (Inverted)
DIAL
0.
(
LMR
®, a registered trademark of Motorola, Inc.).
code.
DCS
code, you or the other station (but not
DCS
mode.
Set
Menu #11 DCS.N/R
knob for ½ second to save the new setting and exit
TONE CODED SQUELCH
) service,
Land Mobile Radio
enabled, as the
DCS
.
knob to select the
DIAL
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