[ARC5] [Milsurplus] B-10 Exported with SCR-134, SCR-183

[Mark K3MSB]

Hi Mike

Well, I'm not surprised various sources do not agree on something that
occurred 85 years ago!

I show the XB-907, XB-10, 14 YB-10, and a single YB-10A were made between
1932 and 1933.

Doing a quick sanity check on Wikipedia "The first 14 aircraft were
designated YB-10 and delivered to Wright Field, starting in November 1933.
The production model of the XB-10, the YB-10 was very similar to its
prototype"

I certainly agree that the radios delivered on the early variants were
probably not the ones later ones.

Here's a photo of the cockpit of a B-10B (of which about 105 were produced
between 1934 and 1936).

http://www.k3msb.com/temp/B10B_Cockpit.jpg

Note the coffee grinder towards the left of the control panel.   That looks
similiar to one used with an ARB (and I have no idea if that's what it
is.....).   Point being, I don't think that remote head was controlling an
SCR-134,  Different radios may very well have been used in later variants
(or changed during the aricraft's career, which lasted in some fashion
towards the latter part of WW II.).

73 Mark K3MSB

On Wed, Nov 11, 2015 at 3:40 PM, Mike Morrow <kk5f at earthlink.net> wrote:

> Mark wrote:
>
> > I was reading an article on the Martin B-10 bomber in the Aug/Sep 1965
> > issue of Air Classics magazine.  The article states:  “Standard radio
> > equipment included both the SCR-183 command set and the SCR-134..."
>
>
> > The B-10 was produced for the USAAF between 1932 to 1934, and exported
> > between 1936 and 1939.
>
> The sources I've read says that the production version of the B-10 entered
> USAAC service in the last half of 1934.
>
> Dave Stinson wrote:
>
> > The SCR-134 transmitter topped-out at 850 KC.
>
> As Mike Feher wrote, that is the BC-114.  Other sources say that the upper
> frequency was considerably lower.
>
> > Receiver went to 1500 KC.
>
> That was the BC-115 tuner with BC-116 RF amp.
>
> > http://radionerds.com/index.php/SCR-134
>
> I have found reference to the SCR-134 in a Signal Corps document dated
> October 1920, but it appears that its hey-day was around 1925.  As Dave
> says in a later posting, there wasn't any liaison set between it and the
> SCR-AA-187.  I believe the SCR-134 MAY have graced the various
> pre-production proto-B-10 models, but it strains credulity that when the
> production B-10 entered service in 1934 as a revolutionary,
> high-performance, world state of the art aircraft, it did not carry the
> 1934 SCR-AA-187 (BC-AA-191 transmitter and BC-AD-219 receiver).  What other
> USAAC aircraft would have merited more the likewise state-of-art SCR-AA-187
> liaison set???
>
> > Also, consider the SCR-183 transmitter coil for 1250-1500 KC but with
> > Navy Acceptance Test stampings.  A.R.C. number 2930 Coil Set.
> > Range 1250-1500 KC. serial X, Cont. N156s-19737, Date 7-1-1941.
> >
> > Photos at:  http://www.ebay.com/itm/361414531223
>
> That's a great find!
>
> But...I see in the photos NO indication that it is associated with
> SCR-A*-183 or -283.  Everything looks like a GF-* coil to me, especially
> the various markings.  I can not determine from the photos if it has the
> center-tapped PA coil that only a GF-* uses.  What am I missing?
>
> Even if it's not SCR-A*-183, it's interesting enough.  For the normal GF
> set, coil set CBY/CW-47135 (2000-2500 kHz) is the lowest frequency coil.
>
> > I submit this is more circumstantial evidence for the LW-MW Command Set
> > "Tertiary Powers" hypothesis.
>
> And that would gain support more if it is a GF coil, IMHO.
>
> Mike / KK5F
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