[Milsurplus] Re: Milsurplus Digest, Vol 56, Issue 16

Wed Dec 17 16:58:28 EST 2008

I've enjoyed good success with simply recycling used 9V batteries for
ARC-5 receiver use.  These receivers only pull about 10mA at 60V
(assuming you've taken care of leaky caps) and run just fine there.
So I just connect roughly 9 used batteries together directly (terminal
to terminal) in a double-wide string.  I then get many hours of
additional use from batteries I would have otherwise tossed because
today's finicky gadgets reject batteries with less than 8V left in
them.  You could of course just connect up 7 new ones and get even
longer service life.  No ripple, no noise, small size, and relatively
light.  I power the filaments with a gel cell.

Dennis AE6C

On Wed, Dec 17, 2008 at 11:37 AM,  <milsurplus-request at mailman.qth.net> wrote:
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> Today's Topics:
>
>   1. CR-88 and RDM-1 (Robert Flory)
>   2. Re: URC-4 (Mike Morrow)
>   3. BC-348 w. 2nd conversion to 85kcs in BC-453 (Marty Reynolds)
>   4. solid state dynamotor (Ray Fantini)
>   5. Re: solid state dynamotor (Lloyd KK7IZ)
>   6. Re: BC-348 w. 2nd conversion to 85kcs in BC-453 (Jim Haynes)
>   7. Re: BC-348 w. 2nd conversion to 85kcs in BC-453 (John Franke)
>   8. Re: solid state dynamotor (B. Smith)
>   9. Re: solid state dynamotor (Robert Nickels)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Wed, 17 Dec 2008 05:38:19 -0500
> From: "Robert Flory" <robandpj at earthlink.net>
> Subject: [Milsurplus] CR-88 and RDM-1
> To: "Johan Keulder" <keuldej at mweb.co.za>,       "milsurplus"
>        <milsurplus at mailman.qth.net>, "Al Klase" <al at ar88.net>
> Message-ID: <410-2200812317103819265 at earthlink.net>
> Content-Type: text/plain; charset="us-ascii"
>
> Hi,
>
> I can't remember now who was asking about the CR-88 tag.  This led to some head-scratching on my part.
>
> I could not connect the CR-88 with the  RDM.  Further scholarship, with the help of my friend Johan in ZS-land and our friends at W2VTM, reveals that CR-88A AKA CRV-46246-B  was used in the RDM-1.  CR-88 was not set up for diversity as revealed by my manual.
>
> RDM(-0 omitted) used AR-88F AKA CRV-46246-A.
>
> http://www.qsl.net/w2vtm/rca_equip.html  shows CR-88As
>
> Just goes to show that sometimes those suffixes sometimes have real significance.
>
> 73, Rob K2WI
> -------------- next part --------------
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>
> ------------------------------
>
> Message: 2
> Date: Wed, 17 Dec 2008 09:28:30 -0600 (GMT-06:00)
> From: Mike Morrow <kk5f at earthlink.net>
> Subject: Re: [Milsurplus] URC-4
> To: milsurplus at mailman.qth.net
> Message-ID:
>        <22824861.1229527711180.JavaMail.root at elwamui-mouette.atl.sa.earthlink.net>
>
> Content-Type: text/plain; charset=UTF-8
>
>>Manufactured by Philharmonic or Philmore? The latter made xtal sets.
>
> Not Philmore.
>
> All the vacuum-tube RT-159*/URC-4 units, plus the much smaller RT-285*/URC-11 and RT-350*/URC-14 survival kit units that I've ever come across were made by Philharmonic Radio and Telephone Corporation.
>
> I find it interesting that the small RT-285A and RT-350A radios have one audio tube replaced by two transistors.  Small entertainment AM broadcast band portables like the 1954 Emerson 838 (based on the 1953 all-subminiature-tube Emerson 747) use a "hybrid" design with two transistors in the audio stage, but did so about five years before these military units did.  But I digress.
>
> Mike / KK5F
>
>
> ------------------------------
>
> Message: 3
> Date: Wed, 17 Dec 2008 10:34:35 -0500 (EST)
> From: "Marty Reynolds" <cosmoline at aa4rm.ba-watch.org>
> Subject: [Milsurplus] BC-348 w. 2nd conversion to 85kcs in BC-453
> To: "David Stinson" <arc5 at ix.netcom.com>
> Cc: cosmoline at netboobie.org, milsurplus at mailman.qth.net
> Message-ID:
>        <4447.24.30.81.88.1229528075.squirrel at fracas.netboobie.org>
> Content-Type: text/plain;charset=iso-8859-1
>
> Dave in short u wrote
>
>
>>
>> but
>> you still didn't say how it was done or how it worked.
>> Where in the "hole?"  How was it fed?
>> Thanks!
>>
>>
>
> Fella put a 1000kc xtal in the 453's 12SK7 RF AMP socket (the
> hole).  He  unwired two lugs that went to xtal & wired same so
> the 12K8's triode section.  That in turn was re-wired as a xtal osc.
>
> 915kc came in to 12K8's pentode mixer section which had
> been altered to bypass normal 190-550 LC ckt. Result was
> 1000-915 = 85kc
>
> I didn't do that adaptation but had it related ages ago &
> was taken on it's direct and reversible nature
>
>   Marty
>
>
>
>
> ------------------------------
>
> Message: 4
> Date: Wed, 17 Dec 2008 11:22:57 -0500
> From: "Ray Fantini" <rafantini at salisbury.edu>
> Subject: [Milsurplus] solid state dynamotor
> To: <milsurplus at mailman.qth.net>, <mrca at mailman.qth.net>
> Message-ID: <4948E112.9A7D.0031.0 at salisbury.edu>
> Content-Type: text/plain; charset=US-ASCII
>
> Anyone have a DC to DC inverter or solid state dynamotor replacement? Was thinking of building up a replacement power supply deck for my ARR-41 I am going to remove the original dynamotor deck and set it aside in case I want to use it but want to build a solid state replacement deck that will fit into the original radio and allow it to operate without the noise of the dynamotor deck. Do not want to change any of the DC distribution wiring so would prefer to use something like the solid state replacement dynamotors that were used on some of the last produced ARC equipment, also if anyone has a hacked ARR-41 power supply deck less dynamotor that will save a lot of fabrication.
> Ray Fantini KA3EKH
>
>
>
>
> ------------------------------
>
> Message: 5
> Date: Wed, 17 Dec 2008 09:32:43 -0700
> From: "Lloyd KK7IZ" <kk7iz at cox.net>
> Subject: Re: [Milsurplus] solid state dynamotor
> To: "Ray Fantini" <rafantini at salisbury.edu>,
>        <milsurplus at mailman.qth.net>, <mrca at mailman.qth.net>
> Message-ID: <6365DA1D2B6B4F6B942E4749027A6271 at userlvnwsus9dr>
> Content-Type: text/plain; format=flowed; charset="iso-8859-1";
>        reply-type=original
>
> One long overlooked source is the old Narco Mark 12 power supply modulators,
> T-12MP12 ,12A, 12B.
> They provide a high voltage PS capable of handling a multi-tube receiver, a
> 5763 transmitter and associated stages, a modulator good for a conservitave
> 10 watts and a speaker amp same power. For a number of years aircraft radios
> were hybrid, tubes and transistors. Have never seen anyone take advantage of
> the parts in them.
>
> Thanx
> Lloyd  KK7IZ
> kk7iz at cox.net
>
>
> ----- Original Message -----
> From: "Ray Fantini" <rafantini at salisbury.edu>
> To: <milsurplus at mailman.qth.net>; <mrca at mailman.qth.net>
> Sent: Wednesday, December 17, 2008 9:22 AM
> Subject: [Milsurplus] solid state dynamotor
>
>
> Anyone have a DC to DC inverter or solid state dynamotor replacement? Was
> thinking of building up a replacement power supply deck for my ARR-41 I am
> going to remove the original dynamotor deck and set it aside in case I want
> to use it but want to build a solid state replacement deck that will fit
> into the original radio and allow it to operate without the noise of the
> dynamotor deck. Do not want to change any of the DC distribution wiring so
> would prefer to use something like the solid state replacement dynamotors
> that were used on some of the last produced ARC equipment, also if anyone
> has a hacked ARR-41 power supply deck less dynamotor that will save a lot of
> fabrication.
> Ray Fantini KA3EKH
>
>
> ______________________________________________________________
> Milsurplus mailing list
> Home: http://mailman.qth.net/mailman/listinfo/milsurplus
> Help: http://mailman.qth.net/mmfaq.htm
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>
>
>
> ------------------------------
>
> Message: 6
> Date: Wed, 17 Dec 2008 10:36:43 -0600 (CST)
> From: Jim Haynes <jhhaynes at earthlink.net>
> Subject: Re: [Milsurplus] BC-348 w. 2nd conversion to 85kcs in BC-453
> To: Marty Reynolds <cosmoline at aa4rm.ba-watch.org>
> Cc: David Stinson <arc5 at ix.netcom.com>, cosmoline at netboobie.org,
>        milsurplus at mailman.qth.net
> Message-ID: <alpine.LFD.2.00.0812171031060.2664 at localhost.localdomain>
> Content-Type: TEXT/PLAIN; format=flowed; charset=US-ASCII
>
> The late W6NRM published an article in CQ - and I can't lay my hand on
> it right at the moment, but was in the mid 1950s - where he converted the
> 915 KHz down to 85, went through the transformers from the Command Set,
> and then converted back to 915 and sent it through the regular detector
> and audio.  He had an external AC power supply, so mounted this stuff in
> the dynamotor space.
>
> Based on his ideas I did something similar, and brought the conversion
> oscillator frequency control out to the front panel so it allowed
> passband tuning.  And I used a bandpass filter I had found in some
> surplus store rather than the 85 KHz IF transformers for selectivity.
>
> Jim W6JVE
>
>
>
> jhhaynes at earthlink dot net
>
>
>
>
> ------------------------------
>
> Message: 7
> Date: Wed, 17 Dec 2008 12:06:09 -0500
> From: "John Franke" <jmfranke at cox.net>
> Subject: Re: [Milsurplus] BC-348 w. 2nd conversion to 85kcs in BC-453
> To: "Jim Haynes" <jhhaynes at earthlink.net>,      "Marty Reynolds"
>        <cosmoline at aa4rm.ba-watch.org>
> Cc: David Stinson <arc5 at ix.netcom.com>, cosmoline at netboobie.org,
>        milsurplus at mailman.qth.net
> Message-ID: <4BA568E323AF44D5B8DDE5A2F85073E8 at youre7075dc078>
> Content-Type: text/plain; format=flowed; charset="iso-8859-1";
>        reply-type=response
>
> It was "A New, Simplified Q5-er" and was in the July 1953 issue of CQ, pages
> 25-27.
>
> John  WA4WDL
>
> ----- Original Message -----
> From: "Jim Haynes" <jhhaynes at earthlink.net>
> To: "Marty Reynolds" <cosmoline at aa4rm.ba-watch.org>
> Cc: "David Stinson" <arc5 at ix.netcom.com>; <cosmoline at netboobie.org>;
> <milsurplus at mailman.qth.net>
> Sent: Wednesday, December 17, 2008 11:36 AM
> Subject: Re: [Milsurplus] BC-348 w. 2nd conversion to 85kcs in BC-453
>
>
>> The late W6NRM published an article in CQ - and I can't lay my hand on
>> it right at the moment, but was in the mid 1950s - where he converted the
>> 915 KHz down to 85, went through the transformers from the Command Set,
>> and then converted back to 915 and sent it through the regular detector
>> and audio.  He had an external AC power supply, so mounted this stuff in
>> the dynamotor space.
>>
>> Based on his ideas I did something similar, and brought the conversion
>> oscillator frequency control out to the front panel so it allowed
>> passband tuning.  And I used a bandpass filter I had found in some
>> surplus store rather than the 85 KHz IF transformers for selectivity.
>>
>> Jim W6JVE
>>
>>
>>
>> jhhaynes at earthlink dot net
>>
>>
>> ______________________________________________________________
>> 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
>>
>
>
>
> ------------------------------
>
> Message: 8
> Date: Wed, 17 Dec 2008 12:37:49 -0500
> From: "B. Smith" <smithab11 at comcast.net>
> Subject: Re: [Milsurplus] solid state dynamotor
> To: <milsurplus at mailman.qth.net>, <mrca at mailman.qth.net>
> Message-ID: <000701c9606e$2e82c180$271cc847 at BCXHTR8HVC4P>
> Content-Type: text/plain; format=flowed; charset="iso-8859-1";
>        reply-type=response
>
> Commercial tube type two way radios made by GE, Motorola, Comco, Johnson,
> RCA  and many,many others all have transistor  switching power supplies. My
> favorites are GE as they have bullet proof  hugh germanium transistors.
> 73
> breck k4che
>
> ----- Original Message -----
> From: "Lloyd KK7IZ" <kk7iz at cox.net>
> To: "Ray Fantini" <rafantini at salisbury.edu>; <milsurplus at mailman.qth.net>;
> <mrca at mailman.qth.net>
> Sent: Wednesday, December 17, 2008 11:32 AM
> Subject: Re: [Milsurplus] solid state dynamotor
>
>
>> One long overlooked source is the old Narco Mark 12 power supply
>> modulators, T-12MP12 ,12A, 12B.
>> They provide a high voltage PS capable of handling a multi-tube receiver,
>> a 5763 transmitter and associated stages, a modulator good for a
>> conservitave 10 watts and a speaker amp same power. For a number of years
>> aircraft radios were hybrid, tubes and transistors. Have never seen anyone
>> take advantage of the parts in them.
>>
>> Thanx
>> Lloyd  KK7IZ
>> kk7iz at cox.net
>>
>>
>> ----- Original Message -----
>> From: "Ray Fantini" <rafantini at salisbury.edu>
>> To: <milsurplus at mailman.qth.net>; <mrca at mailman.qth.net>
>> Sent: Wednesday, December 17, 2008 9:22 AM
>> Subject: [Milsurplus] solid state dynamotor
>>
>>
>> Anyone have a DC to DC inverter or solid state dynamotor replacement? Was
>> thinking of building up a replacement power supply deck for my ARR-41 I am
>> going to remove the original dynamotor deck and set it aside in case I
>> want to use it but want to build a solid state replacement deck that will
>> fit into the original radio and allow it to operate without the noise of
>> the dynamotor deck. Do not want to change any of the DC distribution
>> wiring so would prefer to use something like the solid state replacement
>> dynamotors that were used on some of the last produced ARC equipment, also
>> if anyone has a hacked ARR-41 power supply deck less dynamotor that will
>> save a lot of fabrication.
>> Ray Fantini 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
>>
>> ______________________________________________________________
>> 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
>
>
>
> ------------------------------
>
> Message: 9
> Date: Wed, 17 Dec 2008 13:30:13 -0600
> From: Robert Nickels <ranickel at comcast.net>
> Subject: Re: [Milsurplus] solid state dynamotor
> To: Ray Fantini <rafantini at salisbury.edu>
> Cc: milsurplus at mailman.qth.net
> Message-ID: <49495345.4090807 at comcast.net>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> Ray Fantini wrote:
>> Anyone have a DC to DC inverter or solid state dynamotor replacement?
>>
> Ray, I posted this to another list yesterday, but since the idea is
> applicable to mil radios I figured I'd pass it along here as well.
> DC-AC inverters are getting to be really cheap, and while they all
> require  12VDC input,  voltage multipliers could be used to power higher
> current transmitters and transceivers from the higher capacity
> inverters.  For example, I saw a model rated at 100 watts with a 220VAC
> output for $12 shipped.
>
> ---
>
> I finally had time to do a quick evaluation of what seems to be a decent
> option for generating B+ for small tube gear.   A few weeks ago I found
> the Black and Decker "Pocket Power" on the closeout shelf at a local
> hardware store for $4.99 each, so I bought a couple.   It's about the
> size of a slim paperback book, and contains a 9.6 volt rechargable
> battery and a 16 watt 120 volt AC inverter as well as a regulated power
> supply with a USB connector.  The intended purpose is for charging moble
> phones, MP3 players, etc away from a source of power, but I naturally
> saw other applications!
>
> The first was to plus in a battery set like a Zenith Transoceanic, which
> was not successful.  Two reasons - one being the output current is
> monitored by a processor that just shuts the inverter off if it exceeds
> the design rating, which happens with tube-filament inrush on many
> sets.  Secondly, when I did get it running the RF noise was unbearable.
>
> So I went to plan B, which was to convert the output to DC using a
> bridge rectifier and filter cap, which produces about 140 volts DC with
> a few volts of AC ripple.  A more elaborate filter could have cleaned
> that up, but this supply did a fine job of providing B+ for an ARC-5
> command set (with it's filament power coming from another source).  I
> did a quick characterization using a Clarostat 240C to load the output,
> and found that it held quite well down to about 1000 ohms,  which is
> near the rated maximum output (increased loading causes the unit to shut
> down).  Making a few assumptions about the likely battery capacity and
> efficiency, I'd guess it might provide full output for an hour or so,
> and for several hours with a more nominal load such as the 30ma draw of
> the ARC-5 receiver.  I thought I was so clever until the latest issue of
> QST magazine arrived yesterday, which included an article on ARC-5
> receiver conversions that use the very same idea!  Not a trace of RFI
> could be heard, by the way.
>
> Inverters with internal rechargeable batteries like this have an obvious
> advantage for portable gear, but these days, using a small car-type 120
> inverter may be a smaller, lighter, and even cheaper way to build a
> small isolated B+ supply than by using a conventional transformer.  A
> quick check of eBay showed many in the $5 range with free shipping (go
> figure..)   Twelve volt power to the inverter can come from the same
> transformer or p/s used for your filaments.
>
> Here's what the B&D unit looks like for anyone interested in trolling
> the closeout aisle:
> http://www.amazon.com/Black-Decker-CP120B-20-Watt-Battery/dp/B000H78YXQ
>
> And having satisfied my curiosity (which involved essentially destroying
> the plastic package) - here's what's inside:
> http://smg.photobucket.com/albums/v652/ranickel/Pocket%20Power/
>
> Too big to fit in a BC-611 battery compartment ;-(
>
> 73, Bob W9RAN
>
>
>
> ------------------------------
>
> ______________________________________________________________
> Milsurplus mailing list
> Home: http://mailman.qth.net/mailman/listinfo/milsurplus
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>
> End of Milsurplus Digest, Vol 56, Issue 16
> ******************************************
>