LuciFerko írta:Ja és kéne egy KIS zajú erősítő OIRT-ra és CCIR-re. Sanjos a Sony tunerem érzékenysége kb 0.9 mikrovolt, de pl Zvartoshu blaupunktja 0.66 mV. szóval ezt ellensúlyozni kéne egy normálisabb erősítővel FM-re. itt a lényeg azon van, hogy 14-16 dB jelszinteket kell majd kihalászni a zajból.
When down values 0.9µV to 0.7µV , compensation decrease NOISE !
Correct is when radio have 0.5µV appear multiple radios and scatters , and in time sporadic AGC for the FI module fm tuner is applyed at maxim .
Exemple in FI tda1574 correct is 0.9µV and no noise in imput . When add out amplifier for the 3 BF999 signal have power and noise is very poor amplifier in out . Agc increase automaticaly when signal is increased .
Second HINT , diode actuator not exist in PCB for this radio . No intermodulation appear near stations . Rejection RF voltaje and something appear now .
When FI module have 12dB applyed in TDA1574 AGC increase to 60% .
In moment sporadic need AGC compensation continous to understant low or incoerent signal .
Bouncing DROPED when agc is BRUTE , brute = 80%
BOUNCING reflexion , signal enter and close .. AGC forced down manifestation neter and close and result sporadic with tropo effect .