mance was 54dB at 1kHz.
THD+N at 1kHz was 0.087% mono, and 0.29% stereo. During distortion testing, I engaged the test set 80kHz
The mono audio distortion residual waveform shows mainly the second harmonic, overlaid with noise.
The C 420 tuner quieting charac-
teristics are shown in Fig. 2. I had to switch to FM/Mute mode to measure mono sensitivity. The sta- tion auto search threshold, where it would stop at the signal genera- tor’s frequency during a station scan, was 27dBf. There was no overload at the maximum RF input of 100dBf. The audio output disap- peared when I moved the FM test signal ±50kHz to either side of the tuned center frequency. Stereo audio output was −0.9dB below
the mono audio at 65dBf signal strength.
The seven bars of the display’s tuning strength meter change at the RF signal levels are:
Bar 1 (always on)
Bar 2 at 25dBf
Bar 3 at 30dBf
Bar 4 at 33dBf
Bar 5 at 36dBf
Bar 6 at 39dBf
Bar 7 at 41dBf
MEASUREMENTS— PARASOUND FM SECTION
Again, I did not run any tests on the AM section, except to verify its operation. The
The
−0.5dB from 20Hz to 15kHz. |
Crosstalk performance at 1kHz |
THD+N at 1kHz was 0.09% mono, and 0.15% stereo. THD from
The mono audio distortion residual waveform again showed mainly the second harmonic, over- laid with noise.
The
The audio output didn’t disap- pear until I moved the FM test sig- nal ±150kHz to either side of the tuned center frequency, probably reflecting the reduced sensitivity of the
strength.❖
PHOTO 4: Interior view of Parasound TDQ-150.
measured 58dB. |
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