[MRCA] MRCA Digest, Vol 243, Issue 3
dodgecomcar at aol.com
dodgecomcar at aol.com
Sat Jul 6 09:04:42 EDT 2024
Hi Jeff, long time no see, I’m doing well. I hope you are as well.I’m moving along with what’s necessary for the SCR – 299 set up. I now have a K 51 Chevy with the Radio table in the back. Looking forward to putting everything together. I had to fabricate the proper mounts for the 312 and 342.
I do need one FT-162-A For the BC 342. I am also looking for a T-50 microphone. I have been to Gilbert the last two years, it is a great show. I’ll be looking forward to the one this September.If you are able to find anything, please by all means, call me that would be great.I’m definitely on the hunt to complete the set up!Good hearing from you hope to hear from you soon. Emil 🇺🇸🫡
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On Saturday, July 6, 2024, 8:56 AM, JEFF CICCONE <kg2bz at comcast.net> wrote:
hi Emil. how have you been? . I saw your note on the MRCA. How is the SCR299 project going? I ‘m still in the MVPA with 2 m151a2 and 1 m38a1 jeeps all radio equipped . I’m in Absecon Let me know if you need anything for the project Unfortunately I had a BC312 since sold but Ill check to see if I have any other stuff laying around A good show is the Gilbert show in September where the MRCA has a big display Jeff
On 07/06/2024 7:09 AM EDT dodgecomcar--- via MRCA <mrca at mailman.qth.net> wrote: Hello all, I am new to this forum. I a hoping someone has: FT-162-A radio mount for a BC-312 or BC-342. If so please contact me, I am in New Jersey, cell # 609-780-7145 . Thank you very much, Emil Martinelli
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On Friday, July 5, 2024, 11:44 PM, mrca-request at mailman.qth.net <mrca-request at mailman.qth.net> wrote:
Send MRCA mailing list submissions to mrca at mailman.qth.net To subscribe or unsubscribe via the World Wide Web, visit http://mailman.qth.net/mailman/listinfo/mrca or, via email, send a message with subject or body 'help' to mrca-request at mailman.qth.net You can reach the person managing the list at mrca-owner at mailman.qth.net When replying, please edit your Subject line so it is more specific than "Re: Contents of MRCA digest..." Today's Topics: 1. BC-652 Video (Ray Fantini) 2. M&S Net on Youtube (MilComm Guy) 3. Re: [ARC5] Them Dynamotors (scottjohnson1 at cox.net) ---------------------------------------------------------------------- Message: 1 Date: Wed, 3 Jul 2024 19:53:43 +0000 From: Ray Fantini <RAFANTINI at salisbury.edu> To: "mstangelo at comcast.net" <mstangelo at comcast.net>, "MMRCG at groups.io" <MMRCG at groups.io>, "milsurplus at mailman.qth.net" <milsurplus at mailman.qth.net>, "mrca at mailman.qth.net" <mrca at mailman.qth.net> Subject: [MRCA] BC-652 Video Message-ID: <DM8P220MB0472A3F41E0B9074AE39E30EB8DD2 at DM8P220MB0472.NAMP220.PROD.OUTLOOK.COM> Content-Type: text/plain; charset="us-ascii" Dynamotors and capacitors, have done a lot with homebrewing solid state inverters. Can do efficiencies and interference issues with ease. But this dynamotor presented itself at the right time, for the right place and on that radio the dyna fits right into the chassis. From the beginning the plan was to use this radio in the field so an AC supply was out of the question. Procedures, Step one is to strip out all the weird stuff so the AC power supply had to go. Step two was to return as much of the existing wiring back to the original circuit as possible. That did not take that long after removing the AC supply and the S meter circuit that was installed. Step three is to start doing power on test with HV applied and using current limiting as not to burn too much up. Its step three where you start seeing bad capacitors. You keep searching where current is going and what is and is not working. For some reason not all are bad, along with some having good capacity and high leakage or no capacity and no leakage. Think just about every capacitor that was a screen bypass and plate decoupling was high leakage with a couple being shorted, but some of the oil filed "bath tub" capacitors and other capacitors in the AVC and osculator systems were all solid. There was a big multi part filter capacitor in a rectangular can on the dyna deck that was the prim ary B+ filter that leaked almost as much current as the radio uses and that was replaced with three 10 uf 450-volt electrolytics. At least that how I do capacitors, way too many to just shotgun all of them and if they do work why not keep them in the circuit? These radios get run for hours on the bench so generally if they are going to fail you will see it right away. Completely different radio but same thing, on the Harris RF-350K transceivers you will always have at least a hand full of Tantalum bypass capacitors that short and burn up, but after the first couple hours of operation the ones that were going to fail will fail and the rest settle down and work. Don't know what causes this but suspect that if you don't apply power to those things every now and then that's when they go bad when you finally apply power. Certain others who know better will tell you that you should change all the capacitors being they are all the same age or something like that or they only proper way to do it is with all fresh parts or whatever, me I just roll with trying to limit damage by current limiting and look for the current drains and try to fix them one at a time. As far as doing the videos goes, I do have a small advantage in that years ago I use to do a lot of that work for the government, Engineering and Education is where I spent the last thirty years but those old skill still work, and it's fun to produce and get those videos out there. Appreciate hearing that people like seeing them. Have a great forth everyone. Ray F/KA3EKH -----Original Message----- From: mstangelo at comcast.net <mstangelo at comcast.net> Sent: Wednesday, July 3, 2024 2:34 PM To: Ray Fantini <RAFANTINI at salisbury.edu>; MMRCG at groups.io; milsurplus at mailman.qth.net; mrca at mailman.qth.net Subject: Re: [MRCA] BC-652 Video CAUTION: This email originated from outside of Salisbury University. Please exercise caution when clicking links or opening attachments from external sources. Ray, Enjoyed your video. Keep them coming. I noticed you only changed some of the capacitors. What criteria did you se for capacitor replacement? Are the original rectangular capacitors mica? Enjoyed the sound of the dynamotor. The last time I ran a dynamotor rig was the Wireless #19 set I got from my cousin. It kept blowing silicon rectifiers in my homebrew power supply upon startup so I ran it from the battery in my father's car. 73 Mike N2MS ------------------------------ Message: 2 Date: Fri, 5 Jul 2024 22:58:04 -0400 From: MilComm Guy <m38inmaine at gmail.com> To: "mrca at mailman.qth.net" <MRCA at mailman.qth.net> Subject: [MRCA] M&S Net on Youtube Message-ID: <CAGzJkdzO6NXjT6vn3oMK8F-0djLCLmdakF0nfDc=vsHoU8n2Cg at mail.gmail.com> Content-Type: text/plain; charset="utf-8" I found this today. https://www.youtube.com/watch?v=B_Q3fKjeH-o Mark K1HF -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://mailman.qth.net/pipermail/mrca/attachments/20240705/988fdddd/attachment-0001.html> ------------------------------ Message: 3 Date: Fri, 5 Jul 2024 20:43:23 -0700 From: <scottjohnson1 at cox.net> To: "'David Stinson'" <arc5 at ix.netcom.com>, <mrca at mailman.qth.net>, "'milsurplus at mailman'" <milsurplus at mailman.qth.net>, "'ARC-5'" <arc5 at mailman.qth.net> Subject: Re: [MRCA] [ARC5] Them Dynamotors Message-ID: <[email protected]> Content-Type: text/plain; charset="us-ascii" I look forward to the day I fire up my GRC-14 in My M-38A1. The Radio has the biggest 24V dynamotor I have seen; It is roughly the size of a 2500VA aircraft inverter. I have run the GRC-14 from the AC mains, but never with the dynamotor. I hope the battery and 100A charging system in the A1 is up to the task! It runs a TRC-75 or a GRC-19 just fine, but spinning this big boy up will be interesting! Scott W7SVJ -----Original Message----- From: arc5-bounces at mailman.qth.net <arc5-bounces at mailman.qth.net> On Behalf Of David Stinson Sent: Friday, July 5, 2024 20:38 To: mrca at mailman.qth.net; milsurplus at mailman <milsurplus at mailman.qth.net>; ARC-5 <arc5 at mailman.qth.net> Subject: [ARC5] Them Dynamotors Enjoying everyone's Dynamotor fun. I'm working on a big amp to "umph" my mil-rigs and I've decided to go with a two-Dynamotor supply, one for Screen and one for Plate voltages. They are kinda big. I'll fire them up for you. https://drive.google.com/file/d/1ZqUsPwQUPBkN9DOQlDvo4iRhdx9d4OYr/view Better not run them too long. Don't want to cause another black-out: https://drive.google.com/file/d/1ufavqu9sBpsJqEDx4BQ9aBIq7nZ0bOix/view 73 Dave AB5S -- This email has been checked for viruses by Avast antivirus software. www.avast.com ______________________________________________________________ ARC5 mailing list Home: http://mailman.qth.net/mailman/listinfo/arc5 Help: http://mailman.qth.net/mmfaq.htm Post: mailto:ARC5 at mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: https://www.qsl.net/donate.html ------------------------------ _______________________________________________ MRCA mailing list MRCA at mailman.qth.net http://mailman.qth.net/mailman/listinfo/mrca End of MRCA Digest, Vol 243, Issue 3 ************************************
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