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Spectra VX
3
User’s Guide
Recovery Delay
A detected target creates an audio response in the all-metal
channel which exactly follows the target’s received signal. In
the discrimination channel, an accepted target creates an audio
response which is generated near the peak of the received signal
where the VDI is likely to be most accurate, especially neces-
sary for generating a proper tone ID. A rejected target produces
a null in the audio threshold. The disc tone or threshold null is
maintained for a short time thereafter. This is illustrated as fol-
lows:
The recovery delay determines how long the disc response
(tone or null) lasts. A longer delay results in a longer response.
In trashy sites, a long response delay can mask targets that are
close to rejected trash. Even good targets close to each other
will be difficult to separate. A short response (shorter recovery
delay) makes it easier to separate close targets.
The drawback to a faster response is that deep targets may
not generate a long enough response to be noticeable. The
default setting for recovery delay is moderately fast. In trashy
sites, an alternative to reducing recovery delay is to slow down
the sweep speed of the loop.
Received
Signal
Disc.
Tone
Slow Recovery Delay
Fast Recovery Delay
