Kenwood R 820 Schematic

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' SPECIFICATIONS

Frequency Range
160 meter band 1.8 ~ 2.0 MHz
80 meter band 3.5 ~ 4.0 MHz
40 meter band 7.0 ~ 7.5 MHz
20 meter band 14.0 ~ 14.5 MHz
15 meter band 21.0 ~ 21.5 MHz
10 meter band A 28.0 ~ 28.5 MHz
10 meter band B 28.5 ~ 29.0 MHz
10 meter band C 290 ~ 29.5 MHz
10 meter band 0 29.5 ~ 30.0 MHz

119 meter band (WWV)/JJY 15.0 ~ 15.5 MHz
Shortwave band:
49 meter band
31 meter band
25 meter band
16 meter band

5.9 ~ 6.4 MHz
9.4 ~ 9.9 MHz
11.5 ~12.0 MHz
17.7 ~ 18.2 MHz

Mode
588. CW. AM, RTTY

Receiver Sensitivity .
858 0.25 pV (SW Band 0.5 pV) S + N/N1O d8 Or more
AM 15 av (SW Band 3 uV) S + N/N 10 dB or more

Image Ratio
Better than 80 dB (SW Band better than 50 dB)

IF Rejection

IF Frequency is 90 dB or more down from output signal
(SW Band more than 40 dB)

Receiver Selectivity
CW (0.25) more than 250 Hz (-6 dB). less than 500 Hz
(-6 d8) (fl)
CW (0.5) more than 500 Hz (-6 dB). less than 850 Hz
(-60 dB) (*2)
$88 (2.4) more than 2.4 kHz (-6 d8). less than 3.9 kHz
(-60 dB)
AM (6) more than 6 kHz ( -6 dB). less than 12 kHz ( -60
d8)

Variable Bandwidth _
CW (0.5) 150 Hz ~ 500 Hz (-6 dB) fully variable (3)
$58 (2.4) 600 Hz ~ 2.4 kHz (-6 dB) fully variable
AM (6) 4.3 kHz ~ 6 kHz (-6 dB) fully variable (4)

*1 Installed optional filter-YG-455CN

*2 Installed optional filter-YG-455C

*3 Installed optional filter-YG-88C and YG-455C
4 Installed optional filter-YG-88A

Notch Filter Attenuation
More than 50 dB

Frequency Stability
Within 100 Hz during any 30 minute period after warm up
within i 1 kHz during the first hour after 1 minute of
warm up.

Antenna Impedance
50 ~ 759 (unbalanced)

AF output
More than 15W (852 load, 10% distortion)

AF Load Impedance
4 ~ 169 for both speaker and headphone

Power Consumption
AC 120V. 30W
DC 13.8V. 1.6A

Power Supply .
AC 100. 120. 220. 240V. 50/60 Hz
DC 12 ~ 15V

Semiconductors and Tubes

lC's 4O
FETs 34
Transistors 89
Diodes 170
Tube 1

Dimensions
13-1/8" (W) x 6" (H) x 13-3/16' (D)
(Protection not included)

NOTE:
The circuit and ratings may change without notice due to
development in technology.

SCHEMATHEEK
Beh. T. Hultermans

Postbus 4228
5604 EE Eindhoven

Il-BZI]

3'5 I'HKENWOOD