At the touch
of button the Quad FM4 gives access to a variety, breadth and quality of
programme material that the most dedicated gramophile would find difficult to
equal. Indeed the emotional satisfaction which can be gained froma well
engineered live broadcast is second only to being at the concert itself. A FM
tuner is thus an essential piece of equipment for any serious listener to
music. The FM4, as
one might expect from Quad is deceptively simple and original. Good ergonomics
and advanced electronics are combined to procedure a tuner with exceptional
audio performance and ease of handling.
The Quad FM4 is designed as an adjunct to a high quality music system. As such emphasis in design is placed upon obtaining audio performance from a reasonable input signal rather than the ultimate in selectivity. Performance of the Fm4 is such that given adequate signal strength, it makes no audible contribution to the incoming programme, and provides absolutely faithful reproduction of the original transmission.
The only
controls on the FM4 are an on/off switch, tuning knob and eight pushbuttons
which are used to store and recall stations in the tuner's memory. The tuned
frequency is shown in figures and an ingenious bar graph display provides
simultaneous information of signal strength and centre tuning. A specially
developed dedicated imcroprocessor makes all decisions about muting and AFC and
also controls the tuner's memory in which are stored the preset stations.
Operating
the Quad FM4 issimplicity itself. Once programmed it is only necessary to press
one of the seven preset buttons for the wanted station to be tuned in
perfectly.
Programming
stations into the tuner's memory is very straightforward. The desired frequency
is located by rotating the tuning knob, which will have conspicuous advantages
for anybody who has tried to find a station using pushbuttons to track up and
down. The bar graph confirms that the station is correctly tuned and being
received with sufficient signal strength to give acceptable signal to noise.
AFC and
muting is taken care of automatically. Stereo over-ride, required if the signal
is very weak, is achieved by switching the Quad 44 to MON and adjusting the
balance control for minimum noise.
Programmes
will remain stored in the tuner 's memory almost indefinitely provided that the
tuner is used once in a awhile, and for up to five years even if it is
disconnected from the mains.
When
switched on the tuner remembers the station last used and automatically reverts
to it.
Specifications
Frequency
Range: 88 - 108 MHz
Sensitivity
-30 dB Quieting
[mono] : 1 µV
50 dB
Quieting [mono/stereo] : 2,7 µV / 25 µV
Full
Limiting: less than 1 µV
Signal-to-Noise
Ratio (Input signal 1 kHz at 1 mV, A weighted):
Mono : 76 dB
Stereo
: 70 dB
Distortion
Input Signal (1 kHz):
±75 kHz
[mono/stsreo] : 0-15%/0-15%
±25 kHz
[mono/stsreo] : 0-05%/0-10%
Selectivity: 53 dB
Capture
Ratio: 2-5 dB
IF
Rejection: 100 dB
AM
Suppression: 60 dB
Image
Rejection: 80 dB
Pilot Tone
Suppression: 60 dB
Crosstalk at
1 kHz: 40 dB
Frequency
Response: 20 - 15 kHz : +0 -1 dB
Output Level
30 % Modulation: 100 mV recommended load
Impedance
Source
Indepedance: 100 Ω
Recommended
Load Impedance: more than 20 k Ω
Aerial
Input: 75 Ω unbalanced
De-emphasis: 50 µSec or 75 µsec)
Power
Input: 100-125 or 200-250 50/60 Hz 6VA
Dimensions: (W x H x D):
321 x 64 x 207 mm
Weight: 3 kg