Introductory remarks on the audio recordings of the tests by Carl Swanson. The speech Maj. E. H. Armstrong gave to the Radio Club of America can be found after the test videos.
FM
Test 1 -- Comparison of two, separate AM and FM radio stations in
New York City as received in downstate New Jersey near Phildelphia PA. Test was performed in 1935.
FM
Test 2 -- Comparison of AM and FM transmissions on the 2.5-meter band
using the same transmitter from Yonkers, NY to Columbia University,
performed in 1936 with Major Armstrong's friend and colleague Carmine Runyon as disk jockey.
FM
Test 3 -- Two trans-Atlantic tests of FM on 23 MHz in 1950. The
first was under poor propagation conditions, the second, a month
later, under much better ones.
FM
Test 4 -- Long distance transmission test on VHF between Cedar Rapids
IA and South Dartmouth MA. Noisy, but notable for detection of
meteor scatter. (1951)
FM
Test 5 -- First test transmission over a side channel (subcarrier) on
April, 1952. This technology, later, in modified form, became the
means of transmitting stereophonic audio over present-day FM radio.
FM
Test 7 -- Direct comparison between side-channel (subcarrier) audio and
conventional AM radio as received 75 miles from NYC in Peconic, LI,
NY. Test performed on Nov. 10, 1952.
Speech given by Major E. H. Armstrong in 1952 introducing the recipient of the Armstrong medal, Captain Henry J. Round, at the Radio Club of America.
In this speech, Armstrong recounts numerous advances in radio art and
science from the 1900's to the 1920's in which Capt. Round was involved.
Captain Round
perfected high-accuracy radio direction-finding in WWI which was
instrumental in detecting the movement of the German High Seas Fleet
prior to the Battle of Jutland. He also discovered and reported on the phenomenon of electroluminesence in crystals of Carborundum (silicon carbide), leading eventually to the development of LED's.
