This article/file is for the benefit of all. (c) 1995-96 Bill Cheek-COMMtronics Engineering This file is for personal use only and may NOT be placed on a CD-ROM nor any other media that conveys, stores, or transports for any monetary cost, without expressed permission of the author. This file can only be given away, absolutely free of charge. -Bill Cheek- NFM DISCRIMINATOR CHIPS - BASEBAND AUDIO - SQUELCH GATE DATA ============================================================ There is a growing interest in tapping the baseband audio out of various scanners for decoding of a variety of esoteric signals, including CTCSS, SCA, FSK, RTTY, FAX, etc. By and large, such signals cannot be take from TAPE REC jacks, headphone jacks, and EXT SPEAKER jacks because of the voice-band filtering that is done between the signal source and these output jacks. Therefore, it is necessary to tap the "baseband audio" directly at the output of the discriminator chip for your scanner. The below Table shows a list of scanners, the discriminator chip(s) used in the scanner, circuit symbols of those chips, and three pins of general interest on the chips: RF-Input, Scan Control, and, of course, the baseband audio pin. Even though your scanner may not be listed, if you can find its discriminator chip, it will be listed with one or more scanners below, the pins of which will be the same for your unlisted scanner! Corrections and additions to this list are requested. See my mail and other addresses at the end of this file. SCANNER DISCRIMINATOR CHIP PINS OF INTEREST Updated 7/25/96 CKT RF-in SCAN AUDIO SCANNER NFM CHIP TYPE SYMBOL Pin Pin BASEBAND =============== =============== ======= ===== ===== ========= Not known MPS5071 n/a 16 13 9 AR-1000 TA-7787AF IC-4 16 none 9 AR-2002 MC-3357P IC-4 16 13 9 AR-2500 TA-7761P IC-13 Please verify? 9? AR-3000 MC-3357P ? 16 13 9 AR-800 MC-3361N IC-200 16 13 9 AR-900 MC-3361N IC-201 16 13 9 AR-950 MC-3361N IC-201 16 13 9 BC-100XL MC-3359P IC-1 18 15 10 BC-100XLT TK-10421M-2 IC-401 20 16 11 BC-200XLT TK-10421M-2 IC-401 20 16 11 BC-205XLT TK-10421M-2 IC-401 20 16 11 BC-250 ? IC-3 16 13 9 BC-2500XLT TK-10930VTL IC-201 24 - 12-FM 13-AM BC-3000 NFM/AM TK-10930V IC-202 24 - 12-NFM 13-AM BC-3000 WFM TK-10489M IC-203 20 16-17 11 BC-350A NJM-3359D-A IC-3 18 15 10 BC-400XLT NJM-3359D-A IC-1 18 15 10 BC-560XLT NJM-3359D-A IC-1 18 15 10 BC-700A NJM-3359D-A IC-3 18 15 10 BC-760XLT NJM-3359D-A IC-2 18 15 10 BC-800XLT MC-3359P IC-1 18 15 10 BC-8500XLT MC-3361BP IC-9 16 13 9 BC-855XLT TK-10421M-2 IC-401 20 16 11 BC-890XLT NJM-3359D-A IC-3 18 15 10 BC-950XLT NJM-3359D-A IC-2 18 15 10 HX-1000 TK-10420 U-201 16 13 9 MR-8100 NJM-3359D-A IC-3 18 15 10 MX-5000 MC-3357P IC-4 16 13 9 MX-7000 MC-3357P IC-4 16 13 9 PRO-2002 MC-3357P IC-101 16 13 9 PRO-2003 MC-3357P IC-104 16 13 9 PRO-2004 NFM/AM TK-10420 IC-2 16 13 9 (TP4) PRO-2004 WFM KB4419A IC-1 1 ? 6 (TP3) PRO-2005 NFM/AM TK-10420 IC-2 16 13 9 (TP2) PRO-2005 WFM KA2243N/HA12413 IC-1 1 - 10 (TP1) PRO-2006 NFM/AM TK-10420 IC-2 16 13 9 (TP2) PRO-2006 WFM KA2243N/HA12413 IC-1 1 - 10 (TP1) PRO-2011 TK-10420 IC-1 16 13 9 PRO-2020 MC-3357P IC-101 16 13 9 PRO-2021 TK-10420 IC-2 16 13 9 PRO-2022 MC-3361N IC-1 16 13 9 PRO-2023 NJM-3359D-A ? 18 15 10 PRO-2024 MC-3361N IC-2 16 13 9 PRO-2025 NJM-3359D-A IC-1 18 15 10 PRO-2026 NJM-3359D-A IC-7 18 15 10 PRO-2027 MC-3361N IC-2 16 13 9 PRO-2028 NJM-3359D-A IC-2 18 15 10 PRO-2030 NJM-3359D-A IC-3 18 15 10 PRO-2035 NFM/AM TK-10420 IC-2 16 13 9 (TP2) PRO-2035 WFM KA2243N/HA12413 IC-1 1 - 10 (TP1) PRO-2042 NFM/AM TK-10420 IC-2 16 13 9 (TP2) PRO-2042 WFM KA2243N/HA12413 IC-1 1 - 10 (TP1) PRO-23 MC-3361BD IC-1 16 13 9 PRO-26 NFM/AM TK-10930V IC-14 24 - 12-NFM 13-AM PRO-26 WFM TK-10489M IC-16 20 16-17 11 PRO-31 TK-10420 IC-1 16 13 9 PRO-32 TK-10420 IC-101 16 13 9 PRO-34 TK-10420 IC-101 16 13 9 PRO-35 TK-10421M-2 IC-401 20 16 11 PRO-36 TK-10420 IC-101 16 13 9 PRO-37 TK-10420 IC-101 16 13 9 (TP103) PRO-38 MC-3359P IC-1 18 15 10 PRO-39 MC-3361N IC-201 16 13 9 PRO-41 MC-3359P IC-1 18 15 10 PRO-42 MC-3361N IC-2 16 13 9 PRO-43 TK-10427/-10420 IC-301 16 13 9 PRO-44 MC-3361N IC-201 16 13 9 PRO-46 TK-10421M-3LT IC-401 20 16 11 PRO-51 MC-3361BD IC-1 16 13 9 PRO-60 ? IC-301 16 13 9 Icom R-1 NFM TK-10487 DET-A IC-1 20 Q1 11 Icom R-1 WFM TA-7787AF DET-B IC-1 16 7 9 R-1600 NJM-3359D-A IC-2 18 15 10 R-4030 TK-10421M-2 IC-401 20 16 11 SR-15 TK-10421D-2 IC-1 16 13 9 TurboScan 2 3130-6056-502 U-201 18 ? 10 or 16 ==================================================================== This file is copyrighted (c) 1995-96 Please let me have your input and feedback on the above information and Table, especially for additions and corrections, and I will repost it periodically.. Included below my signature line is a *.BMP graphic of a "typical" NFM discriminator chip to assist those who might have difficulty in identifying the one in their scanner. Save this message to a *.TXT file and then run UUDECODE on it to retrieve the archive file, TK10930.ZIP. Run PKUNZIP on that file and then use any graphic viewer to review the image (not copyrighted). Thanks, +----------------------------------------------------------------------+ | Bill Cheek E-mail: bcheek@cts.com FidoNet: 1:202/731 | | COMMtronics Engineering Compuserve: 74107,1176 | | World Scanner Report Voice Phone: (619) 578-9247 1:30pm-5:30pm | | PO Box 262478 BBS & FAX: after 5:30pm & before 1:30pm | | San Diego, CA 92196-2478 24-hrs, weekends/holidays | | WWW home page: http://ourworld.compuserve.com/homepages/bcheek | | FTP Sites: ftp://ftp.cts.com/pub/bcheek | | ftp://ftp.cts.com/users/crash/b/bcheek | +----------------------------------------------------------------------+