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impedance of the B.F.O. OUTPUT socket is then 600
n.
If the B.F.O.
ATTENUATOR is in the "10 V Source Imp. 5
Q"
position, the output is
taken directly from the fixed gain output amplifier, and the output imped-
ance is 5-
n.
The matching impedance is 140
n.
If the B.F.O. REF. SIGNAL push button is depressed, a fixed voltage is
applied to the V.C.O. which, depending on the scale range factor chosen,
produces a frequency at the B.F.O. OUTPUT socket of 100, 1000, or
10000 Hz. The signal voltage is a function of the B.F.O. ATTENUATOR
and the B.F.O. OUTPUT VOLTAGE settings.
Fig.5.11 shown typical distortion curves depending on load and output
settings.
Fig.5.12 shown typical distortion curves depending on compressor speed
settings. The compression level is 26 dB in this case.
-
10dBr---~----~---.--~----~----r---.-----.----.--~
-60dB~--~----~--~--~----~----~--~----~--~--~
1 Hz
2Hz
5 Hz
10 Hz
20 Hz
50 Hz 100 Hz 200 Hz
500 Hz 1 kHz
2 kHz
Frequency
1714'"~
Fig.5.12.
Typical distortion curves for different compressor speed settings
5.5. AUTOMATIC FREQUENCY CONTROL (A.F.C.)
The A.F .C. circuit enables the V.C.O. to be locked onto resonance peaks.
The A.F .C. is actuated by depressing the appropriate push-button on the
57
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