US Signal Corps: Horseback mobile

Source: Time Magazine; BETTMANN / CORBIS

Yesterday, I stumbled upon this 1940 photograph of the US Army Signal Corps communicating via radio in the field.

I bet that radio kit weighs almost as much as or more than the typical soldier!

Does anyone know what model of Signal Corps radio that would be?

Update"

Richard comments:

Thomas,

The original photo is at the site below.

At the link, https://tinyurl.com/hxp5akx

It's a Radio Set SCR-203 (Phillip pack saddle mounted). Consisted of:
BC-228 transmitter - Transmitter, 2.1-3.1 MHz, 2 ea VT-25 & VT-50, Part of SCR-203
BC-227 receiver - Receiver, 2.1-3.1 MHz, Part of SCR-203
BC-235 control box - Control box, Part of SCR-203

The unit was powered by various battery packs and a GN-35 hand cranked generator and used a 25 ft whip antenna (Image: W.J. Schweitzer collection)

Thanks so much for identifying the equipment, Richard!