Icom IC-R9000L [41/72] Tech talk from loom

Содержание

Похожие устройства

FUNCTIONS RECEI 7 3 AUTOMATIC GAIN CONTROL AGC AGC switches AGC holds audio output constant during fluctu signal strength AGC keeps irritating backgrou from being heard during the short pauses in speech OFF POSITIONS Used when receiving a very weak signal loca stronger signals In this case the RF GAIN useful for reducing receive gain The S meter does not move when the AGC is set t The received audio may be distorted when a stro is received FAST POSITION Normally used when receiving a signal with sho fading such as in CW or FSK mode or when searc signal with the main dial SLOW POSITION Normally used when receiving a signal in SSB mode In FM WFM or AM mode use the SLOW o positions 7 4 NOISE BLANKER The noise blanker effectively reduces interfere pulse type noise such as car ignition systems pulse type noise known as woodpecker noise 1 Push the NB switch ON 2 Adjust the NB LEVEL control as required d on the noise level 3 To suppress woodpecker noise and ot pulse type noise push the NAR WIDE sw WIDE is set NOTE If you turn the NB LEVEL control clockwise the audio output from the may be distorted Tech Talk from loom Q Why does the receiver need AGC A AGC is necessary to output signals constantly from the speaker regardless of the strength of incoming signals Signals of varying strengths enter the receiver circuit through the antenna connector In SSB or CW mode especially signal strength changes a lot from the wave characteristics AGC reduces the receiver gain when a strong signal is received preventing distortion of speaker output After strong signals disappear the receiver gain returns to the original gain AGC automatically controls the receiver gain AGC slow or fast selects the return sp the receiver gain from the reduced gain original gain By holding the receiver gain fo periods AGC constantly emits receive signa the speaker and signals can be comfortably he One aspect of AGC is that very weak signals near stronger signals may be blocked when th is set in the slow or fast position A therefore equipped with an OFF position fo when you wish to receive very weak signals reducing receiver gain

Скачать