[Milsurplus] Early military radios in estate auction
w4ron at carolina.rr.com
w4ron at carolina.rr.com
Fri Feb 12 02:32:07 EST 2010
You guys might be interested in the auction that's going take
place at the Charlotte antique radio conference coming
up in March.
There a number of early military radios in the estate auction.
There's a BC-14A WW1 crystal set, BC-131/SE-1420, IP-501, etc.
Here's a link to the main conference web page,
http://charlottearc2010.homestead.com/index.html
Hope to see ya there.
--
73, Ron w4ron
http://radioheaven.homestead.com/menu.html
http://charlottearc2010.homestead.com/index.html
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> Today's Topics:
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> 1. Re: TBX-8 transceiver for sale (David Stinson)
> 2. If You Need a Regulated Low B+ Supply (David Stinson)
> 3. Re: auction time linked to what timeing source?
> (jcoward5452 at aol.com)
> 4. Re: [ARC5] If You Need a Regulated Low B+ Supply (Mike Feher)
> 5. Re: If You Need a Regulated Low B+ Supply (David Stinson)
> 6. Re: If You Need a Regulated Low B+ Supply (Mike Feher)
> 7. Re: [ARC5] If You Need a Regulated Low B+ Supply
> (Dennis Monticelli)
> 8. Re: [ARC5] If You Need a Regulated Low B+ Supply (Mike Feher)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Thu, 11 Feb 2010 11:22:48 -0600
> From: "David Stinson" <arc5 at ix.netcom.com>
> Subject: Re: [Milsurplus] TBX-8 transceiver for sale
> To: "Military Surplus Mail List" <milsurplus at mailman.qth.net>
> Message-ID: <50BD12E5E1C7428F9317C824ACFE15EC at boudreaux>
> Content-Type: text/plain; format=flowed; charset="iso-8859-1";
> reply-type=original
>
>
> >... it is in basically mint condition. ...
> > The outer case is a little rusty....
>
> <facepalm>
>
> LOL,
> Dave S.
>
>
>
> ------------------------------
>
> Message: 2
> Date: Thu, 11 Feb 2010 13:55:06 -0600
> From: "David Stinson" <arc5 at ix.netcom.com>
> Subject: [Milsurplus] If You Need a Regulated Low B+ Supply
> To: "Old Tube Radios" <boatanchors at theporch.com>,
> <milsurplus at mailman.qth.net>, "ARC5" <arc5 at mailman.qth.net>
> Message-ID: <AF3A5FC5FED94F5CBFD55C51DE9F8B25 at boudreaux>
> Content-Type: text/plain; format=flowed; charset="iso-8859-1";
> reply-type=original
>
> More adventures with surplus DC/DC converters:
>
> http://home.netcom.com/~arc5/90%20VDC/90VDC.html
>
>
> ------------------------------
>
> Message: 3
> Date: Thu, 11 Feb 2010 21:10:00 -0500
> From: jcoward5452 at aol.com
> Subject: Re: [Milsurplus] auction time linked to what timeing source?
> To: jcoward5452 at aol.com, milsurplus at qth.net, arc5 at mailman.qth.net,
> armyradios at yahoogroups.com, boatanchors at mailman.qth.net
> Message-ID: <8CC799F9DCDBF8E-3E6C-E12A at webmail-m092.sysops.aol.com>
> Content-Type: text/plain; charset="us-ascii"
>
>
> Well folks,
> Thank you one and all who responded to my question.I had no intent of bringing on the "snipe" issue.I presume that was a gut reaction by someone and that triggered a lively discussion.
> I had several responses that included html's to time sources that can be linked to and I will investigate as Fr. Time allows.
> However,no one has actually answered my question.To what time source is the auction place linked to? Maybe a Heathkit clock some employee bought on epay? (That would just roll me over!).
> One comment mentioned a 5 mS delay/time zone for WWV.That seems kind of long to me.I would think uS units.
> And, so that you all know, I snipe too.However,lately I have been trying to put in my snipe bid after the auction is over.....A blessing in disguise,I am sure.
> BTW a psychologist/iatrist would have a field day with all these responses! Maybe we should all collaborate on a book about collecting and on line auctions.The proceeds could go to help Hams tossed out of the house for having too much junque.
> Jay KE6PPF
>
>
>
>
>
>
>
> -----Original Message-----
> From: jcoward5452 at aol.com
> To: milsurplus at qth.net; arc5 at mailman.qth.net; armyradios at yahoogroups.com; boatanchors at mailman.qth.net
> Sent: Wed, Feb 10, 2010 5:51 pm
> Subject: auction time linked to what timeing source?
>
>
>
> Hi Folks,
> Maybe I missed something along the way but I am curious as to what time it is on the auction place.I just synched my watch to my laptop's clock and then went and checked it against "live over the air"WWV and it was 4 seconds behind WWV.
> Is there a link to ebay's clock so one can sync to them?
> Thanks or reading,
> Jay
>
>
>
>
>
> ------------------------------
>
> Message: 4
> Date: Fri, 12 Feb 2010 00:16:16 -0500
> From: "Mike Feher" <n4fs at eozinc.com>
> Subject: Re: [Milsurplus] [ARC5] If You Need a Regulated Low B+ Supply
> To: "'David Stinson'" <arc5 at ix.netcom.com>, "'Discussion of AN/ARC-5
> military radio equipment.'" <arc5 at mailman.qth.net>, "'Old Tube
> Radios'" <boatanchors at theporch.com>, <milsurplus at mailman.qth.net>
> Message-ID: <020501caaba2$842cca60$8c865f20$@com>
> Content-Type: text/plain; charset="us-ascii"
>
> BTW Dave - this is a nice approach as you can get taps on the output in 15
> volt increments, which is a nice feature for some of the old time rigs. 73 -
> Mike
>
> Mike B. Feher, N4FS
> 89 Arnold Blvd.
> Howell, NJ 07731
> 732-886-5960
>
>
>
>
> -----Original Message-----
> From: arc5-bounces at mailman.qth.net [mailto:arc5-bounces at mailman.qth.net] On
> Behalf Of David Stinson
> Sent: Thursday, February 11, 2010 2:55 PM
> To: Old Tube Radios; milsurplus at mailman.qth.net; ARC5
> Subject: [ARC5] If You Need a Regulated Low B+ Supply
>
> More adventures with surplus DC/DC converters:
>
> http://home.netcom.com/~arc5/90%20VDC/90VDC.html
> ______________________________________________________________
> 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: http://www.qsl.net/donate.html
>
>
>
> ------------------------------
>
> Message: 5
> Date: Thu, 11 Feb 2010 23:42:47 -0600
> From: "David Stinson" <arc5 at ix.netcom.com>
> Subject: Re: [Milsurplus] If You Need a Regulated Low B+ Supply
> To: "'Discussion of AN/ARC-5 military radio equipment.'"
> <arc5 at mailman.qth.net>, "'Old Tube Radios'"
> <boatanchors at theporch.com>, <milsurplus at mailman.qth.net>
> Message-ID: <696F94E15F204D4CA9E5C5311453F681 at boudreaux>
> Content-Type: text/plain; format=flowed; charset="iso-8859-1";
> reply-type=original
>
> Some folks have asked where I got the converters.
> It was a local surplus house in Carrolton, Texas,
> called "Tanners." We call it the "candy store."
> Lots of good stuff but, alas, none of these remain in stock.
> You find them often on Ebay. Check with any local
> surplus houses you know, because these kind of
> DC/DC converters are becoming pretty common.
> You can get them for all kinds of voltages out.
> If you look at some, be sure they have an isolated output
> (i.e the input and output negatives are not common).
> All of them I've seen in surplus are isolated, but some are not.
> One caution: Many of these can source better than an amp.
> It's easy to look at these little bricks and think of
> safe, cute 12-volt plastic radios, and get careless.
> When you start stacking them,
> they ain't "play-prettys" no more.
> An amp at 300 volts will kill you mos'-very-buncha dead.
> Be careful.
> 73 Dave S.
>
> p.s. I don't know if the case insulation will stand really high voltages,
> since they were designed to never be more than 30 volts above ground.
> I don't allow the cases to contact ground. Haven't had a problem
> so far at the 90-volt level, but I've stacked them to 300 and
> I think that might be a bit "dicey." I'm going to stick with 90 to 120
> volts and be happy.
>
>
>
>
>
> ------------------------------
>
> Message: 6
> Date: Fri, 12 Feb 2010 00:48:23 -0500
> From: "Mike Feher" <n4fs at eozinc.com>
> Subject: Re: [Milsurplus] If You Need a Regulated Low B+ Supply
> To: "'David Stinson'" <arc5 at ix.netcom.com>, "'Discussion of AN/ARC-5
> military radio equipment.'" <arc5 at mailman.qth.net>, "'Old Tube
> Radios'" <boatanchors at theporch.com>, <milsurplus at mailman.qth.net>
> Message-ID: <020701caaba7$00ae9510$020bbf30$@com>
> Content-Type: text/plain; charset="us-ascii"
>
> Switching regulators are inherently isolated, unless, they make an effort to
> connect the input common to the output common. I have never seen one like
> that, which does not mean they do not exist, HI. 73 - Mike
>
>
> Mike B. Feher, N4FS
> 89 Arnold Blvd.
> Howell, NJ 07731
> 732-886-5960
>
>
>
>
> -----Original Message-----
> From: milsurplus-bounces at mailman.qth.net
> [mailto:milsurplus-bounces at mailman.qth.net] On Behalf Of David Stinson
> Sent: Friday, February 12, 2010 12:43 AM
> To: 'Discussion of AN/ARC-5 military radio equipment.'; 'Old Tube Radios';
> milsurplus at mailman.qth.net
> Subject: Re: [Milsurplus] If You Need a Regulated Low B+ Supply
>
> Some folks have asked where I got the converters.
> It was a local surplus house in Carrolton, Texas,
> called "Tanners." We call it the "candy store."
> Lots of good stuff but, alas, none of these remain in stock.
> You find them often on Ebay. Check with any local
> surplus houses you know, because these kind of
> DC/DC converters are becoming pretty common.
> You can get them for all kinds of voltages out.
> If you look at some, be sure they have an isolated output
> (i.e the input and output negatives are not common).
> All of them I've seen in surplus are isolated, but some are not.
> One caution: Many of these can source better than an amp.
> It's easy to look at these little bricks and think of
> safe, cute 12-volt plastic radios, and get careless.
> When you start stacking them,
> they ain't "play-prettys" no more.
> An amp at 300 volts will kill you mos'-very-buncha dead.
> Be careful.
> 73 Dave S.
>
> p.s. I don't know if the case insulation will stand really high voltages,
> since they were designed to never be more than 30 volts above ground.
> I don't allow the cases to contact ground. Haven't had a problem
> so far at the 90-volt level, but I've stacked them to 300 and
> I think that might be a bit "dicey." I'm going to stick with 90 to 120
> volts and be happy.
>
>
>
>
> ------------------------------
>
> Message: 7
> Date: Thu, 11 Feb 2010 22:47:55 -0800
> From: Dennis Monticelli <dennis.monticelli at gmail.com>
> Subject: Re: [Milsurplus] [ARC5] If You Need a Regulated Low B+
> Supply
> To: "Discussion of AN/ARC-5 military radio equipment."
> <arc5 at mailman.qth.net>
> Cc: Old Tube Radios <boatanchors at theporch.com>, David Stinson
> <arc5 at ix.netcom.com>, milsurplus at mailman.qth.net
> Message-ID:
> <2e972efa1002112247o7985be35id7a5c86f5312112c at mail.gmail.com>
> Content-Type: text/plain; charset=ISO-8859-1
>
> Actually DC/DC switching regulators are mostly non-isolated. But the little
> modules you see in surplus stores are often from the telecom industry which
> is the chief user of isolated power and for good reason considering the huge
> ill-defined ground loops that would otherwise result in a big telco central
> office.
>
> Do be careful about how high you stack them because they were not designed
> for that. Extra insulation in the case mounting area is a good idea and
> also antiparallel diodes across the output to prevent inadvertant current
> backfeeding. No guarantee these supplies will all power up in the right
> sequence and could easily force current into their slow-to-come-up brothers.
>
> I had some Lamda 100V AC/DC bricks (isolated) that I tried stacking even
> though I could not find a hard spec on their voltage floating ability. I
> did real well up to 400V and then blew out the "top" brick when I went for
> 500V. Like the hams say, "If your antenna survived the winter, it wasn't
> tall enough!"
>
> Dennis AE6C
>
> On Thu, Feb 11, 2010 at 9:48 PM, Mike Feher <n4fs at eozinc.com> wrote:
>
> > Switching regulators are inherently isolated, unless, they make an effort
> > to
> > connect the input common to the output common. I have never seen one like
> > that, which does not mean they do not exist, HI. 73 - Mike
> >
> >
> > Mike B. Feher, N4FS
> > 89 Arnold Blvd.
> > Howell, NJ 07731
> > 732-886-5960
> >
> >
> >
> >
> > -----Original Message-----
> > From: milsurplus-bounces at mailman.qth.net
> > [mailto:milsurplus-bounces at mailman.qth.net] On Behalf Of David Stinson
> > Sent: Friday, February 12, 2010 12:43 AM
> > To: 'Discussion of AN/ARC-5 military radio equipment.'; 'Old Tube Radios';
> > milsurplus at mailman.qth.net
> > Subject: Re: [Milsurplus] If You Need a Regulated Low B+ Supply
> >
> > Some folks have asked where I got the converters.
> > It was a local surplus house in Carrolton, Texas,
> > called "Tanners." We call it the "candy store."
> > Lots of good stuff but, alas, none of these remain in stock.
> > You find them often on Ebay. Check with any local
> > surplus houses you know, because these kind of
> > DC/DC converters are becoming pretty common.
> > You can get them for all kinds of voltages out.
> > If you look at some, be sure they have an isolated output
> > (i.e the input and output negatives are not common).
> > All of them I've seen in surplus are isolated, but some are not.
> > One caution: Many of these can source better than an amp.
> > It's easy to look at these little bricks and think of
> > safe, cute 12-volt plastic radios, and get careless.
> > When you start stacking them,
> > they ain't "play-prettys" no more.
> > An amp at 300 volts will kill you mos'-very-buncha dead.
> > Be careful.
> > 73 Dave S.
> >
> > p.s. I don't know if the case insulation will stand really high voltages,
> > since they were designed to never be more than 30 volts above ground.
> > I don't allow the cases to contact ground. Haven't had a problem
> > so far at the 90-volt level, but I've stacked them to 300 and
> > I think that might be a bit "dicey." I'm going to stick with 90 to 120
> > volts and be happy.
> >
> >
> > ______________________________________________________________
> > 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: http://www.qsl.net/donate.html
> >
>
>
> ------------------------------
>
> Message: 8
> Date: Fri, 12 Feb 2010 02:15:48 -0500
> From: "Mike Feher" <n4fs at eozinc.com>
> Subject: Re: [Milsurplus] [ARC5] If You Need a Regulated Low B+
> Supply
> To: "'Discussion of AN/ARC-5 military radio equipment.'"
> <arc5 at mailman.qth.net>
> Cc: 'Old Tube Radios' <boatanchors at theporch.com>, 'David Stinson'
> <arc5 at ix.netcom.com>, milsurplus at mailman.qth.net
> Message-ID: <020b01caabb3$371f6320$a55e2960$@com>
> Content-Type: text/plain; charset="us-ascii"
>
> I realize now you are right. A simple DC/DC regulator is a PWM design,
> hence, not isolated. I was obviously only thinking of the ones where they
> went through a transformer between the input and the output. Darn, first
> time I am wrong this year and it is only February. 73 - Mike
>
> Mike B. Feher, N4FS
> 89 Arnold Blvd.
> Howell, NJ 07731
> 732-886-5960
>
>
>
>
> -----Original Message-----
> From: arc5-bounces at mailman.qth.net [mailto:arc5-bounces at mailman.qth.net] On
> Behalf Of Dennis Monticelli
> Sent: Friday, February 12, 2010 1:48 AM
> To: Discussion of AN/ARC-5 military radio equipment.
> Cc: Old Tube Radios; David Stinson; milsurplus at mailman.qth.net
> Subject: Re: [ARC5] [Milsurplus] If You Need a Regulated Low B+ Supply
>
> Actually DC/DC switching regulators are mostly non-isolated. But the little
> modules you see in surplus stores are often from the telecom industry which
> is the chief user of isolated power and for good reason considering the huge
> ill-defined ground loops that would otherwise result in a big telco central
> office.
>
> Do be careful about how high you stack them because they were not designed
> for that. Extra insulation in the case mounting area is a good idea and
> also antiparallel diodes across the output to prevent inadvertant current
> backfeeding. No guarantee these supplies will all power up in the right
> sequence and could easily force current into their slow-to-come-up brothers.
>
> I had some Lamda 100V AC/DC bricks (isolated) that I tried stacking even
> though I could not find a hard spec on their voltage floating ability. I
> did real well up to 400V and then blew out the "top" brick when I went for
> 500V. Like the hams say, "If your antenna survived the winter, it wasn't
> tall enough!"
>
> Dennis AE6C
>
> On Thu, Feb 11, 2010 at 9:48 PM, Mike Feher <n4fs at eozinc.com> wrote:
>
> > Switching regulators are inherently isolated, unless, they make an effort
> > to
> > connect the input common to the output common. I have never seen one like
> > that, which does not mean they do not exist, HI. 73 - Mike
> >
> >
> > Mike B. Feher, N4FS
> > 89 Arnold Blvd.
> > Howell, NJ 07731
> > 732-886-5960
> >
> >
> >
> >
> > -----Original Message-----
> > From: milsurplus-bounces at mailman.qth.net
> > [mailto:milsurplus-bounces at mailman.qth.net] On Behalf Of David Stinson
> > Sent: Friday, February 12, 2010 12:43 AM
> > To: 'Discussion of AN/ARC-5 military radio equipment.'; 'Old Tube Radios';
> > milsurplus at mailman.qth.net
> > Subject: Re: [Milsurplus] If You Need a Regulated Low B+ Supply
> >
> > Some folks have asked where I got the converters.
> > It was a local surplus house in Carrolton, Texas,
> > called "Tanners." We call it the "candy store."
> > Lots of good stuff but, alas, none of these remain in stock.
> > You find them often on Ebay. Check with any local
> > surplus houses you know, because these kind of
> > DC/DC converters are becoming pretty common.
> > You can get them for all kinds of voltages out.
> > If you look at some, be sure they have an isolated output
> > (i.e the input and output negatives are not common).
> > All of them I've seen in surplus are isolated, but some are not.
> > One caution: Many of these can source better than an amp.
> > It's easy to look at these little bricks and think of
> > safe, cute 12-volt plastic radios, and get careless.
> > When you start stacking them,
> > they ain't "play-prettys" no more.
> > An amp at 300 volts will kill you mos'-very-buncha dead.
> > Be careful.
> > 73 Dave S.
> >
> > p.s. I don't know if the case insulation will stand really high voltages,
> > since they were designed to never be more than 30 volts above ground.
> > I don't allow the cases to contact ground. Haven't had a problem
> > so far at the 90-volt level, but I've stacked them to 300 and
> > I think that might be a bit "dicey." I'm going to stick with 90 to 120
> > volts and be happy.
> >
> >
> > ______________________________________________________________
> > 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: http://www.qsl.net/donate.html
> >
> ______________________________________________________________
> 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: http://www.qsl.net/donate.html
>
>
>
> ------------------------------
>
> ______________________________________________________________
> 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
>
>
> End of Milsurplus Digest, Vol 70, Issue 14
> ******************************************
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