From RAFANTINI at salisbury.edu Tue Jul 1 13:56:54 2025 From: RAFANTINI at salisbury.edu (Ray Fantini) Date: Tue, 1 Jul 2025 17:56:54 +0000 Subject: [Milsurplus] BC-474 Cap Pack Mystery! Message-ID: Ok, another project. The BC-474 transmitter receiver. Not my radio just doing it for someone else. Got the radio in and started by removing the Ham radio modifications like a different receiver power cable and the like. Pulled a couple capacitors in the receiver and they were questionable so decided maybe it's time to replace most, at least the ones associated with RF and AF bypassing, coupling and AVC filtering. The smallest amount of leakage in a AVC filter has a huge effect on the AVC action. The more I worked on the radio the more it became apparent that I was not able to find a lot of the capacitors, then the discovery! A thing called the CAP Pack, C10, C17 and C18 and a couple of the screen bypass capacitors all live in the cap pack. Looks like a IF Transformer and located right next to one of the IF cans. Attached are a couple pictures of the cap pack and what was removed after I melted away some of the wax its sealed in. Heat gun works for that. Any leaky capacitors in a battery radio are an issue. Remember that all the time the B Battery is connected the B+ bus in the radio is hot and any leakage will kill the battery when not in use. Somehow the 474 has somewhat of a following so posting this information for anyone who may also work with this radio. Will be posting more as work progresses, maybe video too. Still have a bucket full of BC-654 video that I have to edit. Ray F/KA3EKH -------------- next part -------------- An HTML attachment was scrubbed... URL: -------------- next part -------------- A non-text attachment was scrubbed... Name: capcan2.jpg Type: image/jpeg Size: 986262 bytes Desc: capcan2.jpg URL: -------------- next part -------------- A non-text attachment was scrubbed... Name: capcan1.jpg Type: image/jpeg Size: 1540536 bytes Desc: capcan1.jpg URL: From kargo_cult at msn.com Tue Jul 1 15:56:07 2025 From: kargo_cult at msn.com (Hubert Miller) Date: Tue, 1 Jul 2025 19:56:07 +0000 Subject: [Milsurplus] BC-474 Cap Pack Mystery! Message-ID: I sold off around 5 of BC-474 including one set with bags and generator, but never found one that was not still working. One radio was the "Swedish set". I still have one radio to sell. These emails will jog me to get on that. I suggest Dave Stinson's idea to move the trans lytic cap from cold end to hot end of B+ switch is something you really need to do. As he said, it's really a design error. -Hue Miller Sent from my Galaxy -------------- next part -------------- An HTML attachment was scrubbed... URL: From navy.radio at gmail.com Tue Jul 1 16:19:34 2025 From: navy.radio at gmail.com (Nick England) Date: Tue, 1 Jul 2025 16:19:34 -0400 Subject: [Milsurplus] Navy VLF transmitter tower construction Message-ID: Off topic sort of - I recently got email from someone saying he had been told that the 1200' tower at the Navy's VLF transmitter site in Guardamar Spain was erected by members of an American Indian tribe from Oklahoma. Have you ever heard anything like that? https://www.navy-radio.com/commsta/guardamar.htm I know that Mohawk Indians were famous for working on skyscrapers and bridges in the US and Canada but they were from the northeast and not Oklahoma. best regards, Nick England K4NYW www.navy-radio.com -------------- next part -------------- An HTML attachment was scrubbed... URL: From ersmar at verizon.net Tue Jul 1 17:24:45 2025 From: ersmar at verizon.net (Gene Smar) Date: Tue, 1 Jul 2025 21:24:45 +0000 (UTC) Subject: [Milsurplus] Navy VLF transmitter tower construction In-Reply-To: References: Message-ID: <1744131257.1370875.1751405085254@mail.yahoo.com> In the 1970s in NE PA (Slatington area) where I lived at the time, AT&T was installing microwave relay towers, prolly for DOD. It was reported in the local papers that the ironworkers were from the Mowhawk Nation, from upstate New York. 73 de?Gene Smar AD3F? Sent from my Radio Shack TRS-80 model 100 laptop On Tue, Jul 1, 2025 at 4:19 PM, Nick England wrote: Off topic sort of - I recently got email from someone saying he had been told that the 1200' tower at the Navy's VLF transmitter site in Guardamar Spain was erected by members of an American Indian tribe from Oklahoma. Have you ever heard anything like that?https://www.navy-radio.com/commsta/guardamar.htm I know that Mohawk Indians were famous for working on skyscrapers and bridges in the US and Canada but they were from the northeast and not Oklahoma. best regards,Nick England K4NYW www.navy-radio.com ______________________________________________________________ Milsurplus mailing list Home: http://mailman.qth.net/mailman/listinfo/milsurplus Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Milsurplus at mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html -------------- next part -------------- An HTML attachment was scrubbed... URL: From mstangelo at comcast.net Tue Jul 1 17:35:20 2025 From: mstangelo at comcast.net (mstangelo at comcast.net) Date: Tue, 1 Jul 2025 17:35:20 -0400 (EDT) Subject: [Milsurplus] Navy VLF transmitter tower construction In-Reply-To: References: Message-ID: <1841181349.190036.1751405720201@connect.xfinity.com> At work our purchasing department purchased some equipment from Cherokee owned companies. In discussions with them they mentioned the bulk of their work were federal and military contracts. They may have contracted out the work but they managed the project. Here is an example: https://cherokee-federal.com/contracting-solutions Mike N2MS > On 07/01/2025 4:19 PM EDT Nick England wrote: > > > Off topic sort of - I recently got email from someone saying he had been told that the 1200' tower at the Navy's VLF transmitter site in Guardamar Spain was erected by members of an American Indian tribe from Oklahoma. Have you ever heard anything like that? > https://www.navy-radio.com/commsta/guardamar.htm > > I know that Mohawk Indians were famous for working on skyscrapers and bridges in the US and Canada but they were from the northeast and not Oklahoma. > > best regards, > Nick England K4NYW > www.navy-radio.com (http://www.navy-radio.com) From n2lxm at juno.com Thu Jul 3 17:18:40 2025 From: n2lxm at juno.com (n2lxm at juno.com) Date: Thu, 3 Jul 2025 17:18:40 -0400 Subject: [Milsurplus] Happy 4th of July Message-ID: As we go forward this Holiday Weekend, Please take some time to Honor Our Countries Patriots both passed and present. For with out these men and women we would not be able to live free. Jeff N2LXM Amateur Radio Operator American Patriot Proud Father of Two US Marines -------------- next part -------------- An HTML attachment was scrubbed... URL: