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EDMUND A. LAPORT COLLECTION,
ca. 1920-1950
#16
(.66 cu. ft.: 2 DB)
by Robert S. Harding, 1983
Biography
Six months after graduation from Concord, New
Hampshire High School in 1920, Edmund A. LaPort obtained a commercial first
grade radio operator's license from the Department of Commerce in Chicago. The
Autumn of 1921 found him as a radio operator at KDKF in New York City. However,
due to lack of funds this station closed shortly after he arrived. In December
of 1921, he moved to the New York Service Department of Westinghouse installing
radio receivers.
On January 2, 1923 he joined General Electric and was made laboratory assistant
to I.F. Byrnes, who was in charge of low-power transmitter design. However,
LaPort decided he wanted to be a forest ranger and left in July of 1923 and
headed back to the woods of New Hampshire. In early 1924 LaPort began working in
Montana as a forest ranger. Within a very short time, however, he realized that
he was more interested in radio. Before the year was out, he returned to
Westinghouse where he worked largely on high power transmitters until the Spring
of 1933. On one assignment he traveled to Peking, China where he helped build
three short-wave broadcasting stations.
The depression proved difficult for fledgling radio companies with many going
out of business shortly after opening up. LaPort worked for one of these
unfortunate firms before settling in at Wired Radio, Inc. in Newark, New Jersey.
Here he gained invaluable experience helping to develop equipment for commercial
program transmission over power distribution systems.
In May of 1936 he joined RCA in Camden, New Jersey where he headed up the
formation of their first high-power transmitter operation. He stayed with RCA
until he retired in 1967. In December of 1938 he moved to Montreal where he
helped RCA Victor Co., Ltd. start the development and manufacture of military
and professional equipment. He organized engineering and manufacturing
facilities and trained personnel. He also took a role in leading the company in
developing aviaton navigational equipment.
In July, 1944 he returned to the United States to become chief engineer of the
newly formed RCA International Division. Over the next ten years he traveled
widely, undertaking many important field construction projects, and consulted
with other governments in communications, broadcasting, aviation, and marine
matters.
Edmund A. LaPort was a director of broadcast engineering for the Radio
Corporation of America. From 1954 until 1967 he worked with others in a
corporate level engineering consulting group to coordinate work in the many RCA
plants in all aspects of communications. He authored, Radio Antenna
Engineering, which was published by McGraw-Hill in 1952.
Scope and Content
This collection, assembled by LaPort, consists of about 300 photo prints of
antennas and broadcast installations. Mr. LaPort's original order for these
photo prints has been maintained. His extensive captions for these photo prints
can be found in the individual folders. A Second series contains three articles
by LaPort on aspects of radio and an autobiographical essay.
Provenance
Transferred from the Division of Electricity 4/13/83
Container List
SERIES 1: PHOTOGRAPHS,
1923-1947
| 1 |
1 |
U.S. Navy Type MB Spotting Set,
1925 |
| |
2 |
(2) 500 Watt & (1) 1000
Watt transmitters for installation in China, 1928 |
| |
3 |
TV, TW, TX Radio Telegraph
Transmitters, 1925-27 |
| |
4 |
RE, RF, RG Radio Receivers,
1925 |
| |
5 |
Miscellaneous Radio & Audio
Equipment |
| |
6 |
RCA Type 50-A, May-June, 1927 |
| |
7 |
RCA 50KW HF & AM Type 50F,
1940's |
| |
8 |
Cone-of-Silence Transmitter and
Antenna, 1940-1942. |
| |
9 |
RCAF-AT 3 Transmitter, 1939 |
| |
10 |
RCA CW-1, 4 gc Microwave Relay,
1947 |
| |
11 |
U.S. Navey Model TZ
Transmitter, 1926 |
| |
12 |
RCA 50-B 50 KW Broadcast
Transmitter, 1929 |
| |
13 |
Westinghouse Plant, Home
Receiver Production, 1926 |
| |
14 |
Westinghouse Automatic HF
Telephone System for Carrier-Current Communication Over Utility Power
Lines, 1925 |
| |
15 |
RCA 100 KW AM Broadcast
Transmitter Type 100 D for Norway, 1937 |
| |
16 |
RCA TE-260A Telegraph
Transmitter and TE-343 20-30 KW Transmitter, 1942-1943 |
| |
17 |
RCA 75-MC Transportable
Cone-of-Silence Transmitter, 1940-1942 |
| |
18 |
RCA 500-KW AM Transmitter
installed at Hornby, England - Called "Aspedistra", 1936-1937 |
| |
19 |
Broadcast Station Speech Input
Equipment, 1928 |
| |
20 |
Station 2XAR (WJZ) 30 KW on 760
KC at Bound Brook, NJ, 1926 |
| |
21 |
Westinghouse Aircraft Radio
Communication Equipment Sold to Royal Japanese Navy, 1927 |
| |
22 |
U.S. Army Signal Corps BC-137
Receiver, 1926 |
| |
23 |
-Westinghouse 200W 2000-3000 KC
Telegraph Transmitter, 1928
-Westinghouse 20 KW HF Model T-7 Transmitter, Modulator, and Amplifier,
1927 |
| |
24 |
U.S. Army BC-127 Mobile
Telephone-telegraph Transmitter 250-400 W at 150 to 350 KC, 1923 |
| |
25 |
Station Photographs 1924 - 1925
ERA Antennas, Equipment, and Possible Later Model Amplifier, 1924 - 1925 |
| |
26 |
Westinghouse 200 W CW and MCW
200 to 500 KC Shipboard Model, 1926 |
| |
27 |
RCA Victor (Montreal) Type
TE-147 50-80 KW Telegraph Transmitter, n.d. |
| |
28 |
Westinghouse, high power, low
frequency Transmitter, ca. 1926-1927 |
| |
29 |
Turnstile Antennas, n.d. |
| |
30 |
Wide Band Television Antenna
development stages at RCA Laboratories, Rocky Point, NY, n.d. |
| |
31 |
Electronic production photos at
RCA Victor Company, Ltd., Montreal, 1942 |
| |
32 |
Royal Canadian Air Force AT-12
HF & LF Radio Equipment, 1943 |
| |
33 |
RCA SSB-1, 60 Watt HF
single-sideband complete communication system |
| |
34&35 |
Radiomarine Corporation of
America |
| |
36 |
High Frequency Broadcast
Monitoring Equipment, Vatican Radio, 2949 |
| |
37 |
Pacific Communication Program |
| |
38 |
NBC, Miscellaneous,
1930's-1940's |
| |
39 |
RCA ET-4332; RCA ET-4336
Telegraph Transmitters |
| |
40 |
RCA Communications, Inc. |
| |
41 |
Royal Canadian Air Force GT-24
5 kw Transmitter |
| |
42 |
U.S. Navy Type TAH 5 kw low
frequency Telegraph Transmitter |
| |
43 |
500 Watt 150/200 kc Telegraph
Transmitter TE 237, 1941 |
| |
44 |
U.S. Navy TAK Shipboard Radio
Telegraph Transmitter, 1929-1930 |
| |
45 |
Wired Radio Inc. supressed
carrier single sideband Exciter |
| |
46 |
200 watt LF Radio Telegraph
Transmitter, 1925 |
| |
47 |
NBC 50 KW Broadcasting Station
WEAF (Later WNBC) |
| |
48 |
Navy Transmitter, possibly TBQ,
1932 |
| |
49 |
10 KW Low-Frequency
Transmitter, 1926-1927 |
| |
50 |
CTR-140 VHF Radio Relay
Equipment |
| |
51 |
Pre 1955 RCA Test &
Measuring Equipment |
| |
52 |
WCFL of the Chicago Federation
of Labor, Navy Pier, Chicago, 1931 |
| |
53 |
Phasing and Impedence-matching
Networks for Broadcast Directive Antennas |
| |
54 |
Inspector's Wavemeter, 270-550
KC, 1926 |
| |
55 |
Canadian Broadcasting
Corporation Broadcast Studio Control and Switching System, 1941 |
| |
56 |
RCA 250 watt & 5000 watt AM
Broadcast Transmitters, ca. 1944 |
| |
57 |
Production of Electronic
Equipment, RCA Camden Plant, during WWII |
| |
58 |
Developmental low-power HF
Radio Transmitter, 1940 |
| |
59 |
Schmidt Optical System Control
Console & RCA Large-Screen Home Television, 1940s |
| |
60 |
Fixed-Frequency Receivers for
Airport Traffic Control, Canadian Department of Transportation, 1940;
Airport Receiver Console |
| |
61 |
RCA 15 watt Hailing System,
Royal Canadian Navy, 1942 |
| |
62 |
RCA Type PM-45 Portable Sound
Film Recording Equipment, 1943 |
| |
63 |
U.S. Navy TBH Radio Telegraph
Transmitter |
| |
64 |
40,000 watt Broadcast
Transmitter, Khobarsk, 1927-1928 |
| |
65 |
Photo album of Finnish
Transmitters |
SERIES 2: LAPORT ARTICLES
|
66 |
- "Notes on Radio
Instrumentation"
- "Modulation Systems for Amplitude Modulation"
- "Technical Evolution of American
Broadcast Transmitters" |
| |
67 |
"Brief Outline of Career
of Edmund A. LaPort in Radio Engineering" (autobiographical) |
Robert S. Harding, April, 1983, revised July, 1994
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