[ARC5] ARC5 Digest, Vol 106, Issue 42

Thu Nov 8 17:36:38 EST 2012

Hi guys for info .I was just about to throw out box when i noticed a
instruction book at the bottom.  I dont have a Jones plug on the back  .The
guy that modded the set wrote it all in manual  he had 28 vdc for B+  28
vac  for for heaters . owell .I recapped it last nite trying to get it back
to orignal to nite    73  Darryl   ve3cpo

On Thu, Nov 8, 2012 at 4:06 PM, <arc5-request at mailman.qth.net> wrote:

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> Today's Topics:
>
>    1. Re: BC-1206-CM...and other WWII Beacon Band Units (Clare Owens)
>    2. OD3 VR Tube (k7mks at comcast.net)
>    3. Re: OD3 VR Tube (Kenneth G. Gordon)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Thu, 8 Nov 2012 15:23:18 -0500
> From: Clare Owens <clare.owens at gmail.com>
> Subject: Re: [ARC5] BC-1206-CM...and other WWII Beacon Band Units
> To: Mike Morrow <kk5f at arrl.net>
> Cc: arc5 at mailman.qth.net
> Message-ID:
>         <
> CAFdOJ7Megt5_jdT5+9S5SNvY07FVzfTcxpMHWaDUD0EsVcadzw at mail.gmail.com>
> Content-Type: text/plain; charset=ISO-8859-1
>
> Hi Mike,
>
> I just looked at my BC-1206-CM2 and it has a phenolic terminal strip
> labelled GND, 28V, OUTPUT and ANT.  No Jones plug.  Maybe there were two
> versions??
>
> Clare
>
>
>
>
> On Thu, Nov 8, 2012 at 11:23 AM, Mike Morrow <kk5f at earthlink.net> wrote:
>
> > > also a 512 model that is for 12volts but this requires a separate B+
> > supply about
> > > 150v will do ..different tubes..may be made by Detrola but no maker on
> > mine..
> >
> > Definitely not Detrola.  Detrola made the Model 438, BC-1206-A, and
> > BC-1206-B,
> > which are all basically the same.
> >
> > The 12-vdc filament model is the Setchell-Carlson Model 512.   In
> military
> > service,
> > The Model 512 has the JAN nomenclature of R-76/ARR-13, and it was used
> > with the
> > RCA AVT-112 HF transmitter and AVR-20-A1 HF receiver set in 12-vdc light
> > observation
> > aircraft.  These three units used one AVA-126 vibrator supply for HV,
> > which was
> > 250 vdc.
> >
> > RCA made an AVR-15 beacon band receiver that is the same size as the
> > AVR-20-A1.
> > The AVR-15 is considerably larger than the S-C Model 512, and also lacks
> > the RF stage
> > found in the Model 512 (AN/ARR-13).  I suspect that led to the use of the
> > AN/ARR-13
> > rather than the AVR-15 in these applications.
> >
> > > ...the 512 has a switch for a single beacon frequency or the normal 200
> > to 400khz.
> >
> > No.  That switch selects three pre-adjusted capacitors to place the
> > receiver on
> > 278 kHz, which was the most common **tower** transmission frequency of
> the
> > pre-
> > and post-WWII era.
> >
> > There is another Setchell-Carlson beacon band unit...the
> > dry-battery-powered
> > S-C Model 591 (A and B batteries are required).  In military service it
> is
> > the
> > AN/CRR-1, and it was intended as the receiver companion to the SCR-578-*
> > (BC-778-*)
> > 500 kHz "Gibson Girl" hand-cranked emergency transmitter for USAAF
> aircraft
> > operating over Arctic regions.  It operates from 190 to 420 kHz.
> >
> > So, common beacon band units of the WWII era in US military service were:
> >
> > Detrola Model 438
> > Detrola Model 438 (BC-1206-A)
> > Detrola Model 438 (BC-1206-B)
> > Setchell-Carlson Model 512 (R-76/ARR-13)
> > Setchell-Carlson Model 524
> > Setchell-Carlson Model 524 (BC-1206-C, two major mechanical variants)
> > Setchell-Carlson Model 524 (BC-1206-CM)
> > Setchell-Carlson Model 524 (BC-1206-CM2)
> > Setchell-Carlson Model 591 (AN/CRR-1)
> > Ranger Model 111-C (BC-1206-D)
> > RCA AVR-15
> >
> > IIRC, there are some tube-line up variations between the BC-1206-A and -B
> > models,
> > and the BC-1206-C, -CM, and CM2 models.
> >
> > IIRC, the main difference between the BC-1206-CM2 and earlier
> > Setchell-Carlson
> > beacon band Model 524 receivers is that a square four-pin Jones plug was
> > used
> > at the rear for the power connections.  I don't have a schematic for
> mine,
> > but
> > it is child's play with an ohm-meter to figure out the +28 vdc, common,
> and
> > (maybe) AF output connections on ANY of these beacon band units.
> >
> > Mike / KK5F
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>
> ------------------------------
>
> Message: 2
> Date: Thu, 8 Nov 2012 20:47:36 +0000 (UTC)
> From: k7mks at comcast.net
> Subject: [ARC5] OD3 VR Tube
> To: arc5 <arc5 at mailman.qth.net>
> Message-ID:
>         <
> 1236536801.1455890.1352407656592.JavaMail.root at sz0115a.emeryville.ca.mail.comcast.net
> >
>
> Content-Type: text/plain; charset=utf-8
>
>
>
> The design of t he Chatham Electronics JAN OD3 VR tube is uni qu e with it
> s br own colored base that extends almost full h eigh t of the tube. ?
> There has to be a reason for thi s design - what is it?? I 've also seen
> some rectifier tubes with this similar design.
>
>
>
> Joe k7mks
>
> ------------------------------
>
> Message: 3
> Date: Thu, 08 Nov 2012 13:06:53 -0800
> From: "Kenneth G. Gordon" <kgordon2006 at frontier.com>
> Subject: Re: [ARC5] OD3 VR Tube
> To: arc5 <arc5 at mailman.qth.net>
> Message-ID: <509C1EED.3670.27187E60 at kgordon2006.frontier.com>
> Content-Type: text/plain; charset=ISO-8859-1
>
> On 8 Nov 2012 at 20:47, k7mks at comcast.net wrote:
>
> > The design of t he Chatham Electronics JAN OD3 VR tube is unique
> > with its brown colored base that extends almost full height of the
> > tube. ? There has to be a reason for this design - what is it??
> > I've also seen some rectifier tubes with this similar design.
>
> I have a number of those VR-tubes myself, and have never understood that.
>
> For one thing, VR-tubes must be able to have some input from light to
> "encourage" the formation of the internal "plasma"
>
> Ken W7EKB
>
>
> ------------------------------
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> End of ARC5 Digest, Vol 106, Issue 42
> *************************************
>