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MB1 User Manual
© 2016 Expert Electronics
TRANSCEIVER OPERATIONS
Note:
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Receive quality and overload capability of the receive path in the presence of the powerful
signals, depend on the correct attenuation coefficient of the transceiver's receive path.
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For the quality receiving, air noise should surpass the receiver's own noise on 10-15 dB.
Disable the receive antenna and make sure that are noise level got lower on 10-15 dB to
match receiver's noise level. Lowering of the noise much lower (20-50 dB) means that you set
exceedingly high receiver attenuation, it may lead to receiver's overload with powerful signals.
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Receiver's overload with powerful signals is expressed as a rapid rise of the receiver noise
level above air noise level on 20-40 dB and lowering to the normal values if the overload
emitter is off.
Overload emitter may be beyond the receiver's panorama, you can find it wit the help of the
Band Scope.
7.12 Selecting AGC presets
MB1's receiver has AGC, which triggers only by the receive signals in RX filter bandwidth.
For the signals with different speed of rise and fall, use different speed of AGC settings.
Selecting AGC presets - is carried out by pressing the AGC button on the front panel of the
transceiver (marked with the red rectangle).
Successive presses of the AGC button cycles the AGC presets in the following order: OFF,
LONG, SLOW, MED, FAST, USER.
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