R2000

w w a D . w S a t e e h U 4 t m o .c 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 w w w t a .D S a e h U 4 t e .c m o Design: Henrik Wissing, Offermannstrasse 39, 52159 Roetgen w w w .D a t a e h S 4 t e U m o .c 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/JLICH 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 DR...