[Milsurplus] Re; Modified APS-13 radar units & Yagi antennas in first A-bombs
Jack Sullivan
wa1tej at yahoo.com
Tue Jan 8 13:54:53 EST 2013
The ultimate reference on the modified APS-13 units & specially fabricated Yagi antennas is to be found in John Coster-Mullen's self-published 'Atom Bombs - The Top secret Inside Story of Little Boy and Fat Man.' (2011) (No ISBN) (Available from Amazon).
The bombs did not use the standard issue AS-62 Yagis but specially designed & fabricated units. In the photo of the top of one of the modified unit with the cover removed a can next to the dynamotor has been hand labeled 'Gate Forming Line.' This is a thick book & I can't readily find the reference to this mod. Each unit was also specially calibrated as far as altitude to initiate the trigger circuit went.
My copy is autographed. He sent me some hi-res pix of the APS-13s which I posted in the Vintage Military Radar Group on Yahoo where you will also find my pix of my NOS example of the APS-13 made by RCA in Camden, NJ.
Anyone interested in these matters should get a copy of this encyclopedic study of all aspects of early A-bomb development & technology.
Jack
________________________________
From: "milsurplus-request at mailman.qth.net" <milsurplus-request at mailman.qth.net>
To: milsurplus at mailman.qth.net
Sent: Tuesday, January 8, 2013 12:00 PM
Subject: Milsurplus Digest, Vol 105, Issue 10
3. The AN/APS-13 In Three Different Combat Roles (Mike Morrow)
Message: 3
Date: Mon, 7 Jan 2013 15:57:39 -0500 (EST)
From: Mike Morrow <kk5f at earthlink.net>
To: milsurplus at mailman.qth.net, arc5 at mailman.qth.net
Subject: [Milsurplus] The AN/APS-13 In Three Different Combat Roles
Message-ID:
<10072271.1357592260368.JavaMail.root at wamui-junio.atl.sa.earthlink.net>
Content-Type: text/plain; charset=UTF-8
> When I visited the Hiroshima Memorial museum in Japan, I saw a
> cylindrical transmitter ( about the size of a quart of milk)that stated
> was used to trigger "Fat Boy". It appeared to be a vhf transmitter with
> either a 4-65A or 3x-250 in the final.
That bears no similarity at all to the four units that were used.
It has already been pointed out that four AN/APS-13 units (RT-34/APS-13,
made by both RCA and GE) were used in the altitude radar triggering system.
The stock RT-34 operates around 450 MHz, 450 watts peak pulsed, from two small
6J6 tubes. These four sets used in the triggering system had to be altered
in frequency of operation to prevent mutual interference. The small antennas
seen on the bombs are AS-62/APS-13 units.
Mike / KK5F
------------------------------
Message: 4
Date: Mon, 7 Jan 2013 20:32:45 -0800 (PST)
From: "J. Forster" <jfor at quikus.com>
To: Milsurplus at mailman.QTH.net
Subject: [Milsurplus] APR-4 and RDO
Message-ID:
<36973.12.6.201.31.1357619565.squirrel at popaccts.quikus.com>
Content-Type: text/plain;charset=iso-8859-1
Does anybody have a handy-dandy table of APR-$ and RDO versions and TN-xx
plug-ins and which is compatible with what and their features/differences?
Also, are there any other versions of the APR-4, other than the -4Y?
Finally, roughly when did the -4Y enter service?
Thanks,
-John
===================
------------------------------
Message: 5
Date: Tue, 8 Jan 2013 09:49:51 -0500
From: "Bob" <hoopmonk at snet.net>
To: "ARC 5" <ARC5 at mailman.qth.net>, "Milsurplus"
<Milsurplus at mailman.qth.net>, "Boatanchors"
<Boatanchors at mailman.qth.net>
Subject: Re: [Milsurplus] Tube entenders
Message-ID: <F6F3AE491FE341B391E9CF0AAAF0108D at robertspc>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
I want to thank all that replied to my question . I have a couple of leads
and I now know that there were at least some produced. I have never failed
to get the help I need from the list members.
Bob
W1GTH
----- Original Message -----
From: "Bob" <hoopmonk at snet.net>
To: "ARC 5" <ARC5 at mailman.qth.net>; "Milsurplus"
<Milsurplus at mailman.qth.net>; "Boatanchors" <Boatanchors at mailman.qth.net>
Cc: "Boatanchors" <Boatanchors at mailman.qth.net>
Sent: Sunday, January 06, 2013 7:50 PM
Subject: [Milsurplus] Tube entenders
>I think that this is the right forum to find answers for my lack of
>experience.I am not sure if they were even ever made as I am a relative
>newcomer but as I am now playing around with different boatanchors( ART-13&
>DX 100's etc.) I can see the sometimes need for tube extenders for 7 pin
>1625 and 837 tubes. 4 pin 811's and 7 pin 813's (which have a different pin
>circle diameter than the 1625 type). The base of these sockets are
>sometimes hard to get at.If there are such things and anyone has any of
>these that they no longer have a use for I would like to purchase them.
> Thanks in advance.
> Bob
> W1GTH
> ______________________________________________________________
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Message: 6
Date: Tue, 8 Jan 2013 08:46:29 -0700
From: Richard Solomon <dickw1ksz at gmail.com>
To: Milsurplus at mailman.qth.net
Subject: Re: [Milsurplus] "The Green Books"
Message-ID:
<CAC5FBO8HiVCtsH_JLUp5djjUUfdXh+qSB9og-8bjB2_ssoXwXQ at mail.gmail.com>
Content-Type: text/plain; charset=ISO-8859-1
I have Volume 2 & 3, any idea where I could get Volume 1 ?
Tnx, Dick, W1KSZ
On Mon, Jan 7, 2013 at 1:31 AM, <COURYHOUSE at aol.com> wrote:
> Dave - But I like RADAR so all is well!
>
> <grin> Ed#
>
>
> In a message dated 1/6/2013 6:41:09 A.M. US Mountain Standard Time,
> arc5 at ix.netcom.com writes:
>
> Re: The Signal Corps in WWII Series, aka "Green Books"
>
> ----- Original Message -----
> From: "Francesco Sartorello" <francesco.sartorello at virgilio.it>
>
>
>> Hi gang,
>> is the book mentioned below (US Signal Corps in WWII) still available
>> anywhere?
>
> Original hard copies show up on Ebay but are not cheap.
>
> However- take heart, because the famous (and sometimes "infamous")
> three "Green Books" are available for free .PDF download:
>
> http://archive.org/details/SignalCorpsTheEmergency
>
> http://archive.org/details/TheSignalCorpsTheTest
>
> http://archive.org/details/TheSignalCorpsTheOutcome
>
> While an outstanding and invaluable reference and worth
> the long hours to read it, be aware that the authors
> made some errors concerning the aircraft radio subjects
> (... I'd have to go back and look. Don't remember).
>
> Also- alas, like most every comtemporary commentator
> on communications during WWII, the authors were smitten
> with a fawning love of Radar, going on and on about it
> while giving much less attention to developments in radio equipment.
> It's much like the man who neglects attention to his familiar lady,
> having been stricken by a new and pretty young "honey"
> who's come to town.
> While a frying pan can cure the negligent man,
> we have no such remedy for a Radar-smitten author.
>
> 73 DE Dave AB5S
>
>
>
> ______________________________________________________________
> Milsurplus mailing list
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>
> 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
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> Post: mailto:Milsurplus at mailman.qth.net
>
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> Please help support this email list: http://www.qsl.net/donate.html
------------------------------
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