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In spectrometer mode, the combination and consequent value of these
amplifiers and attenuators depend on the setting of reference level, and the
whole adjustable range of gain can be up to 100dB.
In receiver mode, by default the attenuators and amplifiers would adjust
themselves automatically according to input. Meanwhile, the user can
forcefully set the criteria to be reference level like spectrometer mode, instead
of input.
Receiver not only displays the measured results, but also vocalize it. In
quite a few cases, hearing even replaces vision to play the major part.
Receivers are frequently used to search signals in a mobile manner, in which
level varies across a large range. In this case it would be inconvenient for the
user to adjust the reference level. Thus by default in the receiver mode the
attenuator and IF amplifier are adjusted automatically according to the input,
while the AMP still needs to be adjusted manually. User can also overwirte this
setting to make it adjust automatically according to the reference level, just
like the spectrometer.
The adjustment is in accordance with the total level within the whole
sampling bandwidth.
Attention should not only be paid to the strength of the signal of receiving
frequency, as overload can happen outside the demodulation bandwidth. In
case like there is just a small signal on the receiving frequency, yet there is a
large interferening signal beside that frequency, overload would still be
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