Alinco DJ-V57 - Manual (Page 48)

8.Set Mode
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8.3.8 Menu 8 Clock Shift Setting
In the unlikely event that you may hear a weak noise always on the same frequency, it
may be so-called a CPU-clock noise. Unfortunately this is due to the circuit-design of
this product and can't be eliminated, but can be moved away to another frequency.
1. SFT-OF is displayed on the LCD.
2. Rotate the dial to select the clock shift setting on and off.
8.3.9 Menu 9 Busy Channel Lockout Setting
This function restricts the PTT (transmit) operation.
1. BCL-OF is displayed on the LCD.
2. Rotate the dial to select the Busy Channel Lockout setting on and off.
When Busy Channel Lockout is set to on, transmission is possible only in the
following conditions (and isn't possible otherwise).
The alarm sounds if the PTT key is pressed when transmission is prohibited.
1) When no signal is being received (BUSY isn't displayed).
2) When the tone matches and the squelch is unmuted based on the Tone Squelch
setting conditions.
3) When the codes match and the squelch is unmuted based on the DCS setting
conditions.
BCL-OF BCL-ON
NOTE:
This function isn't a noise-blanker. Also, since not all noises are due to a CPU-
clock noise, the clock shift setting may not be effective.
SFT-OF SFT-ON