TONE CODED SQUELCH
Yaesu FT-8900R Operating Manual Expanded Edition (courtesy of W5JCK) Page 31 of 77
Typical situations that might cause inversion to occur are:
Connection of an external receiver preamplifier
Operating through a repeater
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 DCS code.
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 DCS code, you or the other station (but not
both) can try the following:
1. Press the SET key momentarily to enter the Set mode.
2. Rotate the DIAL knob to select Menu #11 DCS.N/R.
3. Press the DIAL knob momentarily, then rotate the DIAL knob to select the
mode:
TRX N : Encoder; Normal, Decoder; Normal
RX R : Encoder; Normal, Decoder; Reverse (Inverted)
TX R : Encoder; Reverse (Inverted), Decoder; Normal
TRX R : Encoder; Reverse (Inverted), Decoder; Reverse (Inverted)
4. Press and hold in the DIAL knob for ½ second to save the new setting and exit to
normal operation.0.
Remember to restore the default setting to TRX N (Encoder; Normal,
Decoder; Normal) when done.
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