19:
66:. It permitted direct two-way voice communication with an aircraft up to a range of 30 miles (48 km). While the S-Phone provided directional information to the pilot it gave no range information, although a pilot could tell when he was directly over the "Ground" operator because at that point no communication was possible.
61:
The "Ground" set - which was to be used by agents on the ground - weighed about 15 pounds (6.8 kg) including batteries and was typically worn attached to its operator with two canvas straps. It was a highly directional unit which required the operator to face the path of the aircraft. It had the
69:
The primary purpose of the S-Phone was not navigational as such; rather, it was to provide a reasonably secure channel for coded conversation between staff officers based in London and agents in the field, allowing for the exchange of orders and information. The security of a circuit was sometimes
48:
agents working behind enemy lines to communicate with friendly aircraft and coordinate landings and the dropping of agents and supplies. The system was composed of a "Ground" transceiver, designed by
Captain Bert Lane, and an "Air" transceiver designed by Major Hobday, both of the
62:
useful trait that transmitted signals could not be picked up by ground monitoring stations more than one mile distant; however, its signal was only good to 10,000 feet (3,000 m), which brought the aircraft within range of
230:
235:
225:
202:
182:
70:
tested by using an officer who could recognize whether a voice was actually that of the agent who was supposedly speaking to him.
220:
74:
106:
82:
45:
34:
197:
Wireless for the
Warrior, Volume 1 Wireless Sets No. 1 - 88, Louis Meulstee, G. C. Arnold Partners 1995,
31:
102:
198:
178:
87:
37:
214:
50:
41:
18:
91:
144:
174:
73:
It was designed in late 1942, using some of the component parts of the
17:
63:
80:
Use of the phone is shown in the post-war docu-drama
149:Clandestine Radios and SOE Equipment 1940 - 1945
122:Frequency: 337 MHz (TX) / 380 MHz (RX)
8:
135:
169:Foot, Michael Richard Daniell (2004).
7:
105:a similar system developed for the
231:Telecommunications in World War II
14:
236:World War II British electronics
1:
226:Special Operations Executive
46:Special Operations Executive
252:
125:Output Power: 0.1 to 0.2 W
40:system developed during
143:Soerensen, Lars Peter.
221:British military radio
23:
21:
22:S-phone MK-IV, 1943
83:Now It Can Be Told
75:Wireless Set No.37
24:
88:School_for_Danger
243:
205:
195:
189:
188:
166:
160:
159:
157:
155:
140:
251:
250:
246:
245:
244:
242:
241:
240:
211:
210:
209:
208:
196:
192:
185:
168:
167:
163:
153:
151:
142:
141:
137:
132:
119:
114:
100:
59:
12:
11:
5:
249:
247:
239:
238:
233:
228:
223:
213:
212:
207:
206:
190:
183:
177:. p. 80.
161:
134:
133:
131:
128:
127:
126:
123:
118:
115:
113:
112:Specifications
110:
99:
96:
58:
55:
38:radiotelephone
13:
10:
9:
6:
4:
3:
2:
248:
237:
234:
232:
229:
227:
224:
222:
219:
218:
216:
204:
203:1-898805-08-3
200:
194:
191:
186:
184:0-7146-5528-7
180:
176:
172:
171:SOE in France
165:
162:
150:
146:
139:
136:
129:
124:
121:
120:
116:
111:
109:
108:
104:
97:
95:
93:
89:
85:
84:
78:
76:
71:
67:
65:
56:
54:
52:
51:Royal Signals
47:
43:
39:
36:
33:
30:system was a
29:
20:
16:
193:
170:
164:
152:. Retrieved
148:
145:"SOE Radios"
138:
103:Joan-Eleanor
101:
81:
79:
72:
68:
60:
42:World War II
27:
25:
15:
90:, 1946) on
57:Description
44:for use by
215:Categories
154:23 January
175:Routledge
98:See also
117:General
92:YouTube
28:S-Phone
201:
181:
35:duplex
130:Notes
86:(aka
199:ISBN
179:ISBN
156:2008
64:flak
26:The
107:OSS
32:UHF
217::
173:.
147:.
94:.
77:.
53:.
187:.
158:.
Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
