I've been watching all the old B&W episodes of the WW2 TV show "Combat!" filmed in the 1960's, on YouTube.
Most of us have seen, in such old shows/movies, the hand-held 'portable' Walkie-Talkies' they always used back then...
Back then, they weren't called that though, and were first referred to as "Handie-Talkies". First, here's a picture of one.

This model was called a '
BC-611', and alternatively a model '
SCR-536', initially made by Motorola.
They contained
5 valves/tubes, and the internal construction was very neat and modular. They had 2 sets of batteries, one
set being
1.5 V for the directly heated tube filaments, and the other set for approx
100-V for the plates etc. Depending on the
terrain etc., they were good for a range of about 1 to 3 miles in general. Their output power was only
360 Milli-Watts though!!

Some interesting points...
Firstly, in the photo above, the aerial looks like a HF snub, but that's just an unscrewable 'cover', for a 3-foot telescopic aerial.
They were A.M. radios, that could be used on between about 3 to 8 MegHz, and came with boxes of alternative Chrystal's & inductors,
to interchange with, giving you about 50 variations of frequencies in the 80-Meter band.
The aerial, being so short, and no real 'ground' ref, their 'real' actual RF output was only about 30 Milli-Watts or less!!

The units were made to be as 'simple' as possible to use in the field. They had no ON/OFF switch, and raising the aerial turned them on!
They also had
NO volume control, and
no 'squelch' control. They only had a 'transmit' button, and nothing else!!
There were later copies made by the French, (and others), and they were of a much better quality, but looked exactly the same.
I'd love to have one of these for my collection, but they about $600 at least, even if you can find one...

Have a nice day/night...