Specifications - Kenwood R-280 Service Manual

High performance hf amateur band receiver
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SPECIFICATIONS
Frequency Range
1 60 meter band
80 meter band
40 meter band
20 meter band
1 5 meter band
10 meter band A
10 meter band B
10 meter band C
10 meter band D
1 1 9 meter band (WWV1/JJY
Shortwave band:
49 meter band
31 mei<;r band
25 metir band
1 6 meter band
1.8 ~
3.5 ~
7.0 ~
14.0 ~
21.0 ~
28.0 ~
28.5 ~
29.0 ~
29.5 ~
15.0 ~
5.9 ~
9.4 ~
11.5 ~
17.7 ~
2.0 MHz
4.0 MHz
7.5 MHz
14.5 MHz
21.5 MHz
28.5 MHz
29.0 MHz
29.5 MHz
30.0 MHz
15.5 MHz
6.4 MHz
9.9 MHz
12.0 MHz
18.2 MHz
Notch Filter Attenuation
More than 50 dB
Frequency Stability
Within 1 00 Hz during any 30 minute period after warm up
within ± 1 kHz during the first hour after 1 minute of
warm up.
Antenna Impedance
50 ~ 75J) (unbalanced)
AF Output
More than 1.5W (8fi load, 10% distortion)
AF Load Impedance
4 ~ 16Q for both speaker and headphone
Mode
SSB, CW, AM, RTTY
Receiver Sensitivity
SSB 0.25 juV (SW Band 0.5 pV) S + N/N 10 dB or more
AM 1.5 jiV (SW Band 3 0V) S + N/N 10 dB or more
Image Ratio
Better ihan 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
C W ( 0 2 5 ) more than 250 Hz (-6
dB), less than 500 Hz
(-6 dB) (*,)
CW (0.5) more than 500 Hz ( — 6 dB), less than 850 Hz
(-60
dB) (*
2
)
SSB (2.4) more than 2.4 kHz (-6 dB), less than 3.9 kHz
(-60 dB)
AM (6) more than 6 k H z ( — 6dB). less than 12 kHz ( — 6 0
dB)
Variable Bandwidth
CW (05) 150 Hz -
SSB (2.4) 600 Hz
AM (6) 4.3 kHz ~
< 500 Hz (-6
dB) fully variable (*
3
)
~ 2.4 kHz (-6
dB) fully variable
6 kHz (-6
dB) fully variable (M
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
Power Consumption
AC 120V, 30W
DC 13.8V, 1.6A
Power Supply
AC 100, 120, 220, 240V, 50/60 Hz
DC 1 2 ~ 1 5V
Semiconductors and Tubas
IC's
FET's
Transistors
Diodes
Tube
40
34
89
170
1
Dimensions
13-1/8" ( W ) x 6 " ( H ) x 13-3/16"
(Protection not included)
(D)
NOTE:
The circuit and ratings may change without notice due to
development in technology.

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