|OK, we don't know what the original regenerativer receiver looked like when Armstrong made the initiial discovery, but we're going to guess.|
|In Armstrong's own words:
"All the old timers remember CC, later known as MCC and WCC, the Marconi press station at Wellfleet, Mass. This station was the one-hundred percent reliable testing standby of all experimenters, and on MCC the first tests were made. A standard audion detector system was set up and tuned in, and a tuning inductance introduced into the plate circuit of the audion. Then various things began to happen. As the plate inductance was increased, the signals were boosted in strength
to an intensity unbelievable for those days, the more inductance the louder the signal, until suddenly the characteristic tone of MCC -- the tone which any of the old timers, if they heard it on Judgment Morn, would recognize instantly -- disappeared, and in its place was a loud hissing tone, undeniably the same station, but recognizable only by the characteristic swing and the messages transmitted. A slight reduction of the plate inductance and the old tone was back again, -- and then the placing of the hand near a tuning condenser and the hissing tone reappeared. It required no particular mental effort to realize that here was a fundamentally new
phenomenon, as obscure as the principle of the operation of the audion itself, but which opened up an entirely new field of practical operation."
With our simulated MCC, you'll be able to hear what Howard heard on that important night in 1912.
Here are some of the other radios we expect to have online for you listening pleasure:
|The IP-501 was the U.S. Navy's first receiver with the vacuum tube inside the cabinet. This regenerative design was the work of Alan Hazeltine.|
|In the early 1920's, John Reinartz, of QST, showed the amateur radio world how to build simple and effective regenerative receivers for amateur use. Large number were built by the homebrew crowd. With a little luck will have this one on the air.|
|In the late 1920's National Radio Company introduced a line of TRF-Autodynes (a regenerative detector proceeded by a tuned RF amplifier). Here ithe "big-gun" SW-45, a derivative of the SW-5 with push-pull type 45 triodes for "high-fidelity output. Such receivers helped start the short-wave-listening craze.|
|More homebrew. George Grammar's 1933 QST article "Rationalizing the Autodyne" supurred the construction of a lot of regenerative receivers that largely outperformed all but the best superheterodynes of the day.|
|The U.S. Navy RAL designed by RCA in the mid-1930's is arguably the best short-wave regen ever built. It sports two tuned-RF stages, two tuned audio filters and AVC provided by an audio limiter. They served on small ships and submarines throughout WWII.|
|The regenerative receiver lived on. Many of us got our start in electronics by building kits like this in the 1950's ans '60's.|