NAD C420 دليل المستخدم

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FM Tuners:
NAD and Parasound
Reviewed by Charles Hansen and Nancy and Duncan MacArthur
PHOTO 1:
The NAD C 420
stereo tuner.
NAD C 420 stereo AM/FM tuner. screen shows the band and fre- antenna connector, and a threaded
sent the budget end for high-end
NAD Electronics International, 633 tuners. These two manufacturers’ quency of the station being tuned, 75Ω F-type FM antenna jack.
Granite Court, Pickering, Ontario, higher-priced tuners (NAD C 440, FM stereo, whether the station is a The C 420 p

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steps of 50kHz. The AM tuning unit is very light and easy to move. The ten-page manual is entirely of the chassis, and connects to the steps are 10kHz (9kHz for the The front panel has six push in English. Ancillary equipment switch/LED board in the left front. 230V version). buttons: On-Off, FM-AM, Preset includes the remote control with The display/control PC board sits The RDS PS (Program Service) Up/Down, and Tune Up/Down. batteries, power cord, FM dipole behind the front panel. Occupying au

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■ CRITIQUE−NAD C 420, PARASOUND TDQ-150, AND ADCOM GFT-555II ■ By Nancy and Duncan MacArthur reproduction system was identical in each case, and sets sequentially using buttons on the front panel). The all three tuners were plugged into the same circuit of a remote is also handy for changing stations and ac- Some years ago we moved toward a minimalist audio Monster Cable HTS 2000 power conditioner. cessing the presets in random order; in addition, it has system: one source, one volume control, o

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PC board behind the front panel. transformer cases to the RF front- TABLE 2 The compact double-sided epoxy end shield. Parasound describes it PARASOUND TDQ-150 SPECIFICATIONS AND MEASURED RESULTS tuner board occupies most of the as an ultra-wideband IF section for chassis. A schematic was not fur- low distortion, flat response, and a FM SECTION SPECIFICATIONS PARASOUND TDQ-150 MEASURED RESULTS Usable sensitivity, mono 10dBf nished with the unit. wide dynamic range. Several audio Mono quieting @

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mance was 54dB at 1kHz. teristics are shown in Fig. 2. I had the mono audio at 65dBf signal THD+N at 1kHz was 0.09% THD+N at 1kHz was 0.087% to switch to FM/Mute mode to strength. mono, and 0.15% stereo. THD from mono, and 0.29% stereo. During measure mono sensitivity. The sta- The seven bars of the display’s 100–10kHz, mono, did not exceed distortion testing, I engaged the tion auto search threshold, where tuning strength meter change at 0.28%. test set 80kHz low-pass filter to it would stop at