[ARC5] ARC5 Digest, Vol 185, Issue 12

Sun Jun 9 08:59:29 EDT 2019

thanks to all for the infor on the 53&32 dyno  ka9dzr dennis

In a message dated 6/9/2019 3:13:17 AM Central Standard Time, arc5-request at mailman.qth.net writes:

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Today's Topics:
  1. Re: Fwd: T23 tuning tool (John Hutchins)  2. DM-32/ 12 and 28 volt dynamotors (Bill Pileggi)  3. Re: DM-32/ 12 and 28 volt dynamotors (AKLDGUY .)  4. Re: DM-32/ 12 and 28 volt dynamotors (Brian Clarke)

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Message: 1Date: Sat, 8 Jun 2019 17:54:07 -0500From: John Hutchins <jphutch60bj at gmail.com>To: arc5 at mailman.qth.netSubject: Re: [ARC5] Fwd: T23 tuning toolMessage-ID: <71585029-2ab6-61ba-40c0-e2d6786c9cf3 at gmail.com>Content-Type: text/plain; charset="utf-8"; Format="flowed"
Neil =
Most likely easier said than done}
YouTube is your friend, how to mold things.....
mcmaster car has :
1. Shrink-Resistant Modeling Clay : or use paster?
2. rubber/plastic molding compounds:
3. socket head screws (brass or bronze)
It May cost ~15.00 $ bucks for each tool when all is said and done ?
Take a small handle screwdriver,? make a split Mold from it, sheet of paper between the two halves mold of the screwdriver handle.
Pour in the rubber/or/plastic compound, stick the socket head screw in the middle and VO-La ! Custom tuning tool.
Hutch

On 6/8/2019 3:21 PM, AKLDGUY . wrote:> Hi John. I know nothing about this method of fabricating things. I > guess I would have to pay someone to draw up the design from my > instructions?>> Neil ZL1ANM>>> On Sun, Jun 9, 2019 at 2:47 AM John Saxon <johnbsaxon at yahoo.com > <mailto:johnbsaxon at yahoo.com>> wrote:>>    This may be a bit naive, but would this lend itself to a 3d>    printed, custom built tool?? It may very well be too small for a>    hobby printer to print.>>    Just a thought,>    John>    K5ENQ>>> ______________________________________________________________> 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-------------- next part --------------An HTML attachment was scrubbed...URL: <http://mailman.qth.net/pipermail/arc5/attachments/20190608/8cbf4771/attachment-0001.html>
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Message: 2Date: Sun, 9 Jun 2019 06:44:33 GMTFrom: "Bill Pileggi" <wpileggi at juno.com>To: arc5 at mailman.qth.netSubject: [ARC5] DM-32/ 12 and 28 volt dynamotorsMessage-ID: <20190609.024433.22705.1 at webmail03.vgs.untd.com>Content-Type: text/plain; charset=windows-1252
You can use a 28 volt dynamotor even though the filaments are wired for 12 volts. The dynamotor will simply turn a little slower and put out approx. 100-110 volts.  The receiver will still be very happy. (You did replace all the bypass capacitors in the receiver, didn't you? Otherwise, you might have a problem or 2 with high voltage in the receiver...)
I've run the 28 volt dynamotors from as little as 8 volts reliably...Bill KA3AIS
i have a bc-455 Rx that has been converted to 12vdc i know that the dynamotor should be the dm-32 for 28vdc can i use a dm-53(az) dyno 12v/220vdc are they the same size thanks for any help ka9dzr dennis____________________________________________________________Drink This Before Bed, Watch Your Body Fat Melt Like CrazyDiet Insiderhttp://thirdpartyoffers.juno.com/TGL3131/5cfcab07ba61a2b0722efst01vuc

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Message: 3Date: Sun, 9 Jun 2019 20:04:14 +1200From: "AKLDGUY ." <neilb0627 at gmail.com>To: ARC-5 List <arc5 at mailman.qth.net>Subject: Re: [ARC5] DM-32/ 12 and 28 volt dynamotorsMessage-ID:    <CAETC+7OHj_Pu4D2g4Rf4mgODi89m8DAf6ampn_xqtuDAT9OVGw at mail.gmail.com>Content-Type: text/plain; charset="utf-8"
I've brought out the dynamotor 28V lead separate from the heater lead. Adiode in the dynamotor B+ lead and another in the mains-powered B+ leadmeans I don't need to switch the B+ from one to the other. With either thedynamotor or the power supply running, the other's diode is reverse-biased.
Neil ZL1ANM
On Sun, Jun 9, 2019 at 6:45 PM Bill Pileggi <wpileggi at juno.com> wrote:
> You can use a 28 volt dynamotor even though the filaments are wired for 12> volts. The dynamotor will simply turn a little slower and put out approx.> 100-110 volts.  The receiver will still be very happy. (You did replace all> the bypass capacitors in the receiver, didn't you? Otherwise, you might> have a problem or 2 with high voltage in the receiver...)>> I've run the 28 volt dynamotors from as little as 8 volts reliably...Bill> KA3AIS>> i have a bc-455 Rx that has been converted to 12vdc i know that the> dynamotor should> be the dm-32 for 28vdc can i use a dm-53(az) dyno 12v/220vdc are they the> same size> thanks for any help ka9dzr dennis> ____________________________________________________________> Drink This Before Bed, Watch Your Body Fat Melt Like Crazy> Diet Insider> http://thirdpartyoffers.juno.com/TGL3131/5cfcab07ba61a2b0722efst01vuc> ______________________________________________________________> 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>-------------- next part --------------An HTML attachment was scrubbed...URL: <http://mailman.qth.net/pipermail/arc5/attachments/20190609/fb189cf7/attachment-0001.html>
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Message: 4Date: Sun, 9 Jun 2019 18:12:37 +1000From: "Brian Clarke" <brianclarke01 at optusnet.com.au>To: "'Bill Pileggi'" <wpileggi at juno.com>,    <arc5 at mailman.qth.net>Subject: Re: [ARC5] DM-32/ 12 and 28 volt dynamotorsMessage-ID: <[email protected]>Content-Type: text/plain;    charset="us-ascii"
Command receivers are now about 80 years old; they were probably onlydesigned for the average life of an airman - about 6 weeks. Dave Stinson andothers have been achieving good results with reduced HT on Commandreceivers. The advantage of this is that those potted capacitors don't ejecttheir innards, or dry out and fail OC. But there are two negative effects of lower HT:* The screen Voltages on the RF stages are rather too low for goodperformance - lower sensitivity and worse S/N* The audio output is rather lower.Possible fixes:* Feed the screens from the top of the screen Voltage divider; maybe evendisconnect the screen Voltage divider and reduce the under-chassis heatingto get better drift performance* Run the audio output into a dummy load and feed the audio to an ordinaryamplifier.
You can get more HT out of a DM-32 run on 12 Vdc; connect the field windingsin parallel.
To answer Dennis' query: you can swap the DM-32 body for the DM-53Z; theyare the same size and use the same fastenings. However, then you run therisk of damaging the potted bypass capacitors. I have cut open the pottedcapacitors and replaced the contents with capacitors rated at 400 V and 630V, depending on their position in the circuit. Shortly after WWII, the laterSeries 12 receivers used potted capacitors rated at 400 V - if you can findthese, they can be a straight drop in.
73 de Brian, VK2GCE
On Sunday, 9 June 2019 4:45 PM, Bill Pileggi said:
You can use a 28 volt dynamotor even though the filaments are wired for 12volts. The dynamotor will simply turn a little slower and put out approx.100-110 volts.  The receiver will still be very happy. (You did replace allthe bypass capacitors in the receiver, didn't you? Otherwise, you might havea problem or 2 with high voltage in the receiver...)
I've run the 28 volt dynamotors from as little as 8 volts reliably...BillKA3AIS
i have a bc-455 Rx that has been converted to 12vdc i know that thedynamotor should be the dm-32 for 28vdc can i use a dm-53(az) dyno 12v/220vdc are they thesame size thanks for any help ka9dzr dennis

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End of ARC5 Digest, Vol 185, Issue 12*************************************
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