[Milsurplus] Capacitor across AOT primary, was: RadioMarine Corporation AR-8506-B Receiver Resurrected.

Tue May 3 13:19:39 EDT 2022

No, the function of the capacitor across the audio output transformer is to attenuate the upper audio frequencies.  It operates along with the transformer's leakage inductance to act as a limiting tone control.  See Radiotron Designer's Handbook, 4th Ed, page 214, 4th paragraph.Jim

Logic: Method used to arrive at the wrong conclusion, with confidence.  Murphy

-----Original Message-----
From: Ray Fantini <RAFANTINI at salisbury.edu>
To: MMRCG at groups.io <MMRCG at groups.io>; Joe Connor <joeconnor53 at yahoo.com>; milsurplus at mailman <milsurplus at mailman.qth.net>
Sent: Tue, May 3, 2022 10:12 am
Subject: Re: [Milsurplus] [MMRCG] RadioMarine Corporation AR-8506-B Receiver Resurrected.

#yiv7624675710 #yiv7624675710 -- _filtered {} _filtered {} _filtered {}#yiv7624675710 #yiv7624675710 p.yiv7624675710MsoNormal, #yiv7624675710 li.yiv7624675710MsoNormal, #yiv7624675710 div.yiv7624675710MsoNormal {margin:0in;margin-bottom:.0001pt;font-size:11.0pt;font-family:sans-serif;}#yiv7624675710 a:link, #yiv7624675710 span.yiv7624675710MsoHyperlink {color:blue;text-decoration:underline;}#yiv7624675710 a:visited, #yiv7624675710 span.yiv7624675710MsoHyperlinkFollowed {color:purple;text-decoration:underline;}#yiv7624675710 p.yiv7624675710msonormal0, #yiv7624675710 li.yiv7624675710msonormal0, #yiv7624675710 div.yiv7624675710msonormal0 {margin-right:0in;margin-left:0in;font-size:11.0pt;font-family:sans-serif;}#yiv7624675710 p.yiv7624675710msonormal0, #yiv7624675710 li.yiv7624675710msonormal0, #yiv7624675710 div.yiv7624675710msonormal0 {margin-right:0in;margin-left:0in;font-size:11.0pt;font-family:sans-serif;}#yiv7624675710 p.yiv7624675710msonormal, #yiv7624675710 li.yiv7624675710msonormal, #yiv7624675710 div.yiv7624675710msonormal {margin-right:0in;margin-left:0in;font-size:11.0pt;font-family:sans-serif;}#yiv7624675710 p.yiv7624675710msochpdefault, #yiv7624675710 li.yiv7624675710msochpdefault, #yiv7624675710 div.yiv7624675710msochpdefault {margin-right:0in;margin-left:0in;font-size:11.0pt;font-family:sans-serif;}#yiv7624675710 p.yiv7624675710msonormal1, #yiv7624675710 li.yiv7624675710msonormal1, #yiv7624675710 div.yiv7624675710msonormal1 {margin-right:0in;margin-left:0in;font-size:11.0pt;font-family:sans-serif;}#yiv7624675710 p.yiv7624675710msonormal2, #yiv7624675710 li.yiv7624675710msonormal2, #yiv7624675710 div.yiv7624675710msonormal2 {margin-right:0in;margin-left:0in;font-size:11.0pt;font-family:sans-serif;}#yiv7624675710 p.yiv7624675710msonormal01, #yiv7624675710 li.yiv7624675710msonormal01, #yiv7624675710 div.yiv7624675710msonormal01 {margin-right:0in;margin-left:0in;font-size:11.0pt;font-family:sans-serif;}#yiv7624675710 p.yiv7624675710msonormal02, #yiv7624675710 li.yiv7624675710msonormal02, #yiv7624675710 div.yiv7624675710msonormal02 {margin-right:0in;margin-left:0in;font-size:11.0pt;font-family:sans-serif;}#yiv7624675710 p.yiv7624675710msochpdefault1, #yiv7624675710 li.yiv7624675710msochpdefault1, #yiv7624675710 div.yiv7624675710msochpdefault1 {margin-right:0in;margin-left:0in;font-size:11.0pt;font-family:sans-serif;}#yiv7624675710 span.yiv7624675710msohyperlink {}#yiv7624675710 span.yiv7624675710msohyperlinkfollowed {}#yiv7624675710 span.yiv7624675710msohyperlink1 {}#yiv7624675710 span.yiv7624675710msohyperlinkfollowed1 {}#yiv7624675710 span.yiv7624675710emailstyle181 {}#yiv7624675710 span.yiv7624675710emailstyle34 {}#yiv7624675710 p.yiv7624675710msonormal3, #yiv7624675710 li.yiv7624675710msonormal3, #yiv7624675710 div.yiv7624675710msonormal3 {margin:0in;margin-bottom:.0001pt;font-size:11.0pt;font-family:sans-serif;}#yiv7624675710 p.yiv7624675710msonormal4, #yiv7624675710 li.yiv7624675710msonormal4, #yiv7624675710 div.yiv7624675710msonormal4 {margin:0in;margin-bottom:.0001pt;font-size:11.0pt;font-family:sans-serif;}#yiv7624675710 span.yiv7624675710msohyperlink2 {color:blue;text-decoration:underline;}#yiv7624675710 span.yiv7624675710msohyperlinkfollowed2 {color:purple;text-decoration:underline;}#yiv7624675710 p.yiv7624675710msonormal03, #yiv7624675710 li.yiv7624675710msonormal03, #yiv7624675710 div.yiv7624675710msonormal03 {margin-right:0in;margin-left:0in;font-size:11.0pt;font-family:sans-serif;}#yiv7624675710 p.yiv7624675710msonormal04, #yiv7624675710 li.yiv7624675710msonormal04, #yiv7624675710 div.yiv7624675710msonormal04 {margin-right:0in;margin-left:0in;font-size:11.0pt;font-family:sans-serif;}#yiv7624675710 p.yiv7624675710msonormal5, #yiv7624675710 li.yiv7624675710msonormal5, #yiv7624675710 div.yiv7624675710msonormal5 {margin-right:0in;margin-left:0in;font-size:11.0pt;font-family:sans-serif;}#yiv7624675710 p.yiv7624675710msochpdefault2, #yiv7624675710 li.yiv7624675710msochpdefault2, #yiv7624675710 div.yiv7624675710msochpdefault2 {margin-right:0in;margin-left:0in;font-size:11.0pt;font-family:sans-serif;}#yiv7624675710 p.yiv7624675710msochpdefault3, #yiv7624675710 li.yiv7624675710msochpdefault3, #yiv7624675710 div.yiv7624675710msochpdefault3 {margin-right:0in;margin-left:0in;font-size:11.0pt;font-family:sans-serif;}#yiv7624675710 p.yiv7624675710msonormal11, #yiv7624675710 li.yiv7624675710msonormal11, #yiv7624675710 div.yiv7624675710msonormal11 {margin:0in;margin-bottom:.0001pt;font-size:11.0pt;font-family:sans-serif;}#yiv7624675710 p.yiv7624675710msonormal12, #yiv7624675710 li.yiv7624675710msonormal12, #yiv7624675710 div.yiv7624675710msonormal12 {margin:0in;margin-bottom:.0001pt;font-size:11.0pt;font-family:sans-serif;}#yiv7624675710 p.yiv7624675710msonormal21, #yiv7624675710 li.yiv7624675710msonormal21, #yiv7624675710 div.yiv7624675710msonormal21 {margin:0in;margin-bottom:.0001pt;font-size:11.0pt;font-family:sans-serif;}#yiv7624675710 p.yiv7624675710msonormal22, #yiv7624675710 li.yiv7624675710msonormal22, #yiv7624675710 div.yiv7624675710msonormal22 {margin:0in;margin-bottom:.0001pt;font-size:11.0pt;font-family:sans-serif;}#yiv7624675710 span.yiv7624675710msohyperlink11 {color:blue;text-decoration:underline;}#yiv7624675710 span.yiv7624675710msohyperlinkfollowed11 {color:purple;text-decoration:underline;}#yiv7624675710 p.yiv7624675710msonormal011, #yiv7624675710 li.yiv7624675710msonormal011, #yiv7624675710 div.yiv7624675710msonormal011 {margin-right:0in;margin-left:0in;font-size:11.0pt;font-family:sans-serif;}#yiv7624675710 p.yiv7624675710msonormal012, #yiv7624675710 li.yiv7624675710msonormal012, #yiv7624675710 div.yiv7624675710msonormal012 {margin-right:0in;margin-left:0in;font-size:11.0pt;font-family:sans-serif;}#yiv7624675710 p.yiv7624675710msonormal021, #yiv7624675710 li.yiv7624675710msonormal021, #yiv7624675710 div.yiv7624675710msonormal021 {margin-right:0in;margin-left:0in;font-size:11.0pt;font-family:sans-serif;}#yiv7624675710 p.yiv7624675710msonormal022, #yiv7624675710 li.yiv7624675710msonormal022, #yiv7624675710 div.yiv7624675710msonormal022 {margin-right:0in;margin-left:0in;font-size:11.0pt;font-family:sans-serif;}#yiv7624675710 span.yiv7624675710emailstyle1811 {font-family:sans-serif;color:windowtext;}#yiv7624675710 p.yiv7624675710msochpdefault11, #yiv7624675710 li.yiv7624675710msochpdefault11, #yiv7624675710 div.yiv7624675710msochpdefault11 {margin-right:0in;margin-left:0in;font-size:10.0pt;font-family:sans-serif;}#yiv7624675710 p.yiv7624675710msochpdefault12, #yiv7624675710 li.yiv7624675710msochpdefault12, #yiv7624675710 div.yiv7624675710msochpdefault12 {margin-right:0in;margin-left:0in;font-size:10.0pt;font-family:sans-serif;}#yiv7624675710 span.yiv7624675710emailstyle341 {font-family:sans-serif;color:windowtext;}#yiv7624675710 span.yiv7624675710EmailStyle57 {font-family:sans-serif;color:windowtext;}#yiv7624675710 .yiv7624675710MsoChpDefault {font-size:10.0pt;} _filtered {}#yiv7624675710 div.yiv7624675710WordSection1 {}#yiv7624675710 Pure speculation, remember that I know nothing about ships but think the liberty ships used DC power system because if they did not have steam up and were not  underway they would run off the battery banks on board and when the boilers were up and running they would use the three fifty volt DC generators that were in series to keep the batteries charged and also maybe provide some form of regulation of the DC distribution system? Real simple system that works regardless of if the boilers were on line or not. The had oil lamps in the engine room so if there was no electrical power at all they would be able to get steam up and running the generators and get everything running that way. That ship although built during WW2 was all built around nineteen twenties technology. If they had AC generators just imagine the problems of trying to sync them and transferring and always having to have at least one on line. With DC distribution you just fall back on batteries like in your car. Also with AC they would have to have at least two generators and there are no backup systems on a liberty ship, one engine, one shaft but they did have two boilers. Interesting footnote, the deck winches and all the machines on deck were all directly powered from steam and not electric. They have a huge diesel air compressor that you would see for being used for jack hammers and the like so that they can operate all the deck equipment without having to run the boilers.    Ray F/KA3EKH       From: MMRCG at groups.io <MMRCG at groups.io> On Behalf OfJ Mcvey via groups.io
Sent: Tuesday, May 3, 2022 10:55 AM
To: Joe Connor <joeconnor53 at yahoo.com>; MMRCG at groups.io; milsurplus at mailman <milsurplus at mailman.qth.net>; MMRCG at groups.io
Subject: Re: [Milsurplus] [MMRCG] RadioMarine Corporation AR-8506-B Receiver Resurrected.       Hi Ray,    I didn't know that model receiver, so I looked it up and found a reference on "Radiomuseum.org". It says the radio is an ac/dc type.    I always assumed that all shipboard systems were AC for the same reasons AC not DC distribution is used on land. What would they use distributed DC for?    On Tuesday, May 3, 2022, 10:35:45 AM EDT, Ray Fantini <rafantini at salisbury.edu> wrote:       Lot of weirdness and mystery, at least for me about how the whole DC distribution system worked aboard ship. Had the opportunity to crawl all around the SS John Brown and the original electrical system was 110 volt DC where they had three fifty volt DC steam powered generators in series and a massive battery bank that at one time powered the ships electrical system but think none of that’s connected today and they are all 120 Volts AC from a huge Onan atop one of the holds. Don’t know how that relates to things like there gyro compass and displays being all that was up and running and if original would assume it’s still DC powered. Looking at that web site for that receiver can see where the B+ and B- are all isolated from ground so with that in mind there are plenty of places for feedback and osculation if everything is not right and also got to assume that over the radios lifetime someone has gotten into it and screwed with the wiring in a AC conversion. When restoring one of those do you restore it to that point of working from the isolated DC source? And was there any reference to ships ground on DC distribution systems? Somewhere recall how on modern Navy ships the AC system is split in such a way that each leg is fifty or sixty volts relative to ground or something like that and not a hot and a neutral.   Ray F/KA3EKH     ______________________________________________________________
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: <http://mailman.qth.net/pipermail/milsurplus/attachments/20220503/7f62764a/attachment-0001.html>