Here's the details. Wasn't a problem to wire and it just plugs in the NBFM socket.
Phil Philip LaMarche LaMarche Enterprises, Inc. www.instantgourmetspices.com www.w9dvm.com 800-395-7795 pin 02 727-944-3226 FAX 727-937-8834 NASFT 30210 K3 #1605 CCA 98 00827 W9DVM -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Glen Zook Sent: Tuesday, March 31, 2009 9:36 PM To: [email protected] Subject: {Collins} Product detector for 75A-2 / 75A-3 Several people have asked if I would provide them with a built version of the solid-state product detector for the Collins 75A-2 / 75A-3 receivers which would plug into the NBFM socket. Therefore, I have fabricated the circuit into a sealed unit. To use the product detector (which requires no DC or AC voltage to operate) you have to change a jumper on the mode switch and re-route the BFO signal to the NBFM adapter socket. A marked up section of the schematic is provided. When the modifications are made, the product detector functions in both the CW and NBFM positions of the mode switch. When in the CW position the AVC is turned off and when it the NBFM position the AVC is turned on. The unit utilizes Schottky diodes and is isolated from any DC voltages that are present on the NBFM switch. Other than the 2 connections there are no other changes required in the receiver. Those modifications can be restored with very little effort to remove the circuit and return the receiver to its original condition. Details of the product detector can be found at http://k9sth.com/uploads/Product_Detector_ad-1.JPG I am working on a "generic" version of the product detector that can be used in many "boat anchor" receivers that will require hard wiring or some sort of additional socket. Glen, K9STH Website: http://k9sth.com _______________________________________________ CCA DAYTON 2009 INFORMATION: HOTEL - BANQUET - BOOTH http://tinyurl.com/dlyywg SHARE THE FUN: JOIN THE COLLINS COLLECTORS ASSOCIATION TODAY ! http://www.collinsradio.org/membership/ NETS: Tues & Thur: 3.805 MHz-2000 Central + Fri: 3.895 MHz-2000 Pacific SUNDAYS: 14.263 MHz-2000 UTC + AM Net: 29.050 MHz-1200 Central 1st Wednesday AM Net 3.880 MHz-2000 local (ET, CT, MT, PT) ______________________________________________________________ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/[email protected]/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: [email protected] To unsubscribe, send an email to [email protected] with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
