Kenwood R2000 User Guide

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

Design: Henrik Wissing, Offermannstrasse 39, 52159 Roetgen

drmv01_new.UTSCH - drmv01.sch

8

7

6

5

4

3

DRM-MIXER FOR KENWOOD R2000 (RECEIVE MODE SET TO FM !)

2

1

L1

100mH

1

D D

9VDC INPUT

2

J2

C2

100nF

LINKED TO

U2

1

IN

78L05

GND

2

3

OUT

C4

100nF

C1

10uF

C3

330pF

C11

680pF

C13

R2000
Q54 OUTPUT

ZF 455 KHZ INPUT

LINKED TO

C C

R2000
BASE Q33
R198/27K

C10

1
2

J3

100nF

LINKED TO
R2000

B B

GROUND

R1 160K

B

C

T1
BC817-40

E

R3
1K

GND

R2
3K3

C9
100nF

POTI SET TO
75% OUTPUT

5k
P1

SA612A

C8

100nF

U1

8

1

C7

100nF

V+

IN12IN2

50pF

5

6

OS27OS1

OUT2

OUT1

GND

3

4

C6

C5

100nF

2n2

467kHz

X1

R4 33K

C12

1nF

GND

AUDIO OUTPUT
TO PC-SOUND CARD

1
2

J1

TP1

THIS STAGE
MAY NEED

GND

BO1

IMPROVEMENT OR
OMMITED ?!

REV: DATE: ENG:

A

A A

PROJECT:
COMPANY:

ADDRESS:
CITY
COUNTRY:

INITIAL PAGE: OF:

DRM MIXER
HUSKY ELECTRONIC DESIGN CENTER

GRUENEPLEISTRASSE 45
D-52159 ROETGEN
GERMANY

8

02.02.2003

FILE:DRMV01.SCH

10.12.2002

7

V.COMMICHAU

11

6

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!

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Page 1 of 1 (26-Jul-2003)

4

3

BO2

BO3

BO4

2

1