2013年6月16日 · TM 11-238 Radio Sets SCR-194 And SCR-195 And Auxiliary Equipment 1942-04-17 "Radio sets SCR-194 and SCR-195 are highly portable, low power / high frequency sets which include transceivers. They are used to communicate over distances up to 5 miles.

1939年，他们造出了第一台无线背负式步话机（walkie talkie），型号为SCR-194。 SCR-194推出之后，缺陷很多，不适合战场使用。 于是，军方开始邀请民营企业加入，共同进行项目的研究。

2020年9月16日 · Field artillery set. 27.7 to 52.2 Mc. T-24 mic. This page was last edited on 16 September 2020, at 17:31. Content is available under Creative Commons Attribution Non …

不久后（1939年），他们造出了第一台无线背负式步话机（walkie talkie），型号为SCR-194。东西虽然造出来了，但是缺陷很多，不适合战场使用。 于是，他们开始邀请民营企业加入研究项目。加尔文公司，就是其中之一。 加尔文公司牵头研发的型号，是SCR-536。研发 ...

SCR-194 / BC-222 . is an American backpack, developed for the artillery. It dates from the 1930s. It is generally considered to be the first true US Army portable transceiver. It contains two tubes It used plug in coils Because it was intended for use by the Artillery, it had Earphones (HS-22) and a separate Microphone (T-24).

The radio set SCR-I94 is operated with all tweh'e sections of A.N-29-B drawn out usiug coil C-17-i, marked A; with the ten largest or lower sections using coil C-175, marked D.

The BC-222 is a battery operated portable transceiver developed for the US Army Artillery. Operating frequency bands are 27.7 - 38.5 MHz (Coil A) and 36.9 - 52.2 MHz (Coil B), the frequency coil not in use is fixed by two metal braces at the left inside the cabinet.

This document provides instructions for operating Radio Sets SCR-194 and SCR-195. It describes the components of each radio set including the radio receivers and transmitters BC-222 and BC-322. It provides details on operating techniques for transmitting and receiving, adjusting calibration settings, and portable or vehicular operation.

Radio set SCR 178 is a ground transportable radio set, intended for point-to-point ad ground-to-plane communication between artillery units and aircraft observation purposes. Replaced by SCR 608, 609, 610 and 628. Used by Sig.C, AAF, FIA. Pack; same as SCR-178 except carrying cases have pack saddle hangers for transportation by animal.

2017年6月12日 · 二战前，美国军方已经认识到无线电通信的重要性，于1938年研制出第一款便携式无线通信工具——步话机（Walkie Talkie）SCR-194。 它全部由电子管制成，非常笨重，不很适用，很快就被淘汰。