I have test and the newer model MOS 114 but the result is the same and i don't know why;Borber said:For stereo separation of 40dB your FM oscillator must have flat frequency response within 0.1dB up to 100kHz if you plan to use RDS also. In front of varicap diode there may be resistor connected to DC input and it is together vith diode capacitance forming LPF. Question is is POS suitable for MPX modulation at all. You should check it first. You should check your circuit in front of POS for frequency response also.
Stereo LED is driven by 19kHz pilot tone in MPX and it is on low frequency side so less attenuated.
I use with pll and without pll , but the result is the sameBorber said:OK if you testedd with MOS-114 then post your circuit. There must be something wrong. Just a suggestion: your modulation and PLL output to POS should be low impedance.
I have test the same circuit (no PLL) and with MOS-114 , but the result is same.Borber said:If POS connected as in the last circuit (no PLL) has low stereo separation then POS is not capable to be modulated with MPX (modulation bandwidth is smaller than specified 100kHz) or it has additional capacitor connected between DC input and ground. In this case insert voltage follower in front of DC input (pin 8).
I have post the circuit of the MOS-144 inside and haven't any capacitor in input.Borber said:As I presume the problem can be the input capacitance of POS or MOS.
I don't have buy this kit.Borber said:Anyway your kit has low impedance drive to VCO imput and correct circuit for PLL-AF combinning. You circuit above has 6dB peak at 100Hz.
If i use this circuit is ok;Borber said:Left Lf353 is PLL filter and the second is low impedance drive.
Ok , i will try it.Borber said:Only under one condition: PLL out must have low impedance like in kit schematics. After 3.3kohm resistor put another follower.
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