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26.07.2003
Kenwood R-2000 Modification for DRM
Receive Mode : FM
RF Gain setting: manual mode, adjusted to 6-8 depending on the station signal
Tested at Roetgen/Germany (near Aachen) DRM Station received:
Deutsches Welle Sines/Portugal (900km), reception quality: 1-2 Deutsche Welle Ju lich/Germany (30km), reception quality: 3
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Design: Henrik Wissing, Offermannstrasse 39, 52159 Roetgen
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drmv01_new.UTSCH - drmv01.sch
8 7 6 5 4 3 2 1
DRM-MIXER FOR KENWOOD R2000 (RECEIVE MODE SET TO FM !)
L1 100mH
D
J2
1 2 C2
1 IN
U2 78L05 GND 2
3 OUT C4 100nF C1 10uF C3 330pF C13 C11 680pF
D
9VDC INPUT
LINKED TO R2000 Q54 OUTPUT
100nF
GND 50pF 8 V+ U1 SA612A IN1 7 OS1 6 OS2 5 OUT1 OUT2 467kHz
ZF 455 KHZ INPUT
C
LINKED TO R2000 BASE Q33 R198/27K
C10 1 2 J3 100nF
C
X1
3K3 R1 160K
1 C B T1 BC817-40 E C9 100nF R3 1K 5k P1 C8 C7 100nF 100nF
2
3
GND
IN2
R2
4 GND
AUDIO OUTPUT TO PC-SOUND CARD
POTI SET TO 75% OUTPUT
C5 2n2
C6 R4 33K 1 2 100nF C12 1nF
B
LINKED TO R2000 GROUND
TP1
J1
B
THIS STAGE MAY NEED IMPROVEMENT OR OMMITED ?!
GND
BO1
REMARK: WITH THIS MODIFICATION A VERY GOOD RECEIPT OF DEUTSCHE WELLE SINES/PORTUGAL (900KM) WAS POSSIBLE BUT RECEIPT OF DEUTSCHE WELLE GERMANY/J*LICH WAS BAD, EVEN THE DISTANCE WAS ONLY 30KM!
BO2
REV:
A
DATE:
02.02.2003
ENG: V.COMMICHAU
BO3
A
PROJECT: COMPANY: ADDRESS: CITY COUNTRY: INITIAL
DRM MIXER HUSKY ELECTRONIC DESIGN CENTER GRUENEPLEISTRASSE 45 D-52159 ROETGEN FILE:DRMV01.SCH GERMANY 10.12.2002 PAGE: 1 OF: 1
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Page 1 of 1 (26-Jul-2003)
R198
Q33

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