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

[Mike Morrow]

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