Sherwood R-725/RDS Service Manual page 5

Audio/video pro-logic receiver
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a FM SECTION
Measuring methods in confirmity with IEC standard 315
Measurements condition FM : Radio frequency = 98.1 MHz, Audio frequency = 1kHz
* Reference level = 1mV on ( 75 ohms, 300 ohms )
* Deviation : MONO = +75kHz, Stereo = +67.5kHz +7.5kHz (USA Version)
MONO = +40kHz, Stereo = +40kHz +7.5kHz (Europe Version)
* Test Point : TP 1 = 90.14MHz, TP2 = 98.1MHz, TP 3 = 106.1MHz
* Filter = B.P.F at STEREO
~NO:
DESCRIPTION
VERSION
| UNIT
LIMIT
| NOMINAL |
| 1 Tuning Renge
LOW~HIGH
|
USA
| MHz
|
87.5 ~ 107.9
oa
Europe
|
87.5 ~ 108.0
'Step
AUTO/Man
USA
kHz
;
200
fo
Europe
100/50
| 2 |Usable Sensitivity
TP 1
i
USA
| GBF
|
<17.2
<14.2
|
SIN = 30 dB
TP 2
| dBf
;
<17.2
<14.2
|
TP 3
|
|
dBf
<17.2
<14.2
|
'S/N = 26 dB
TP 1
Europe
qBf
| §
<202
( |
<17.2
TP2
| dB
|
<20.2
<17.2
|
TP 3
|
=a
dBf
<20.2
<17.2
3 Full Limiting Sense
Output = -3 dB
|
USA
| dBf
<152
|
<122
|
Europe
| dBf | <20.2
<17.2_|
| 4 'Auto Stop Level
2
dBf
|
31.245
| 31.24+3
|
| 5 Auto Error
USA
1
KHz
| 0 64200
|
425
1
|
| _ _ _
Europe
kHz
+15
|
+20
6 S/N Ratio
MONO
| dB
>64
>68
|
STEREO
dB
260
|
=64
|
| 7 'Total Harmonic Distortion
MONO
%
<05
|
<O03
|
|
STEREO |
|
%
|
<08
<O.5
|
_ 8 '50 dB Quietion Sensitivity
MONO
|
USA
| GBF
|
<23.2
|
<202
|
|
STEREO
|
dBf
§ <48.3
| <453
|
46 dB Quietion Sensitivity
MONO
___
Europe
qBf
=
<232
<202
|
|
STEREO |
___OBf
<483
<453
| 9 |Channel Separation
100 H2z
|
| dB
235
i
>40
—_
1 kHz
dB
6340,
345
oa
10 kHz
|
| dB
|
230
|
235
10 |Frequency Response at +1.5 dB
|
I Hz
20~12.5
10~14
| 11 Spurious Response
|
USA
|
dB
|
270
|, >80
|:
p o
4
Europe
| dB
> 80:
>90
|
| 12 |IF Rejection
TP 1
|
|
4B
|
=70
>80
|
| 13 Image Rejection
TP 3
USA
dB
386560)
|
«0365
a
___Europe
|
OB
|
=70
|
>80
|
| 14 :AM rejection Ratio
|
;
dB
>50
i:
355
|
15 _ Capture Ratio
{__ dB
22.5.)
22
| 46 .Alternative CH Selectivity +400 kHz
|
dB
|
245
|
>860
' 17 'Output Level
MONO
|
mV
| 500+150 | 50+100 |
| 48 [RDS Sensitivity
(Europe
| dBf
|
<40.2
| «382
|
w= GENERAL
Power consumption ----------
rrr rrr crt rte
r rer
ctee USA/Canada : 4.5A, Europe 1 100W
Power Supplies +--+ =s<se-ise snes e neste es ee Seite reese
s USA/Canada : AC 120V, 60Hz
Europe : AC 230v, 5OHz
Dimensions (WxHxD) -----++--0 rrr rrr rrr cre rrr retest
cress 440 x 140x380 mm
17-5/16 x 5-1/2 x 14-1546 inchs
Weight (Net)- --------------2-e
eer e rte rere
eee
renee! 15.9 kg (31.3 3 Ibs)

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