When Allied troops were halted near Anzio, Italy during the spring of 1944, personal portable radios were strictly prohibited as the Germans had radio detecting equipment that could detect the local oscillator signal of superheterodyne receivers. Crystal sets lack local oscillators, so they cannot be detected in this way.

When Allied troops were halted near Anzio, Italy during the spring of 1944, personal portable radios were strictly prohibited as the Germans had radio detecting equipment that could detect the local oscillator signal of superheterodyne receivers. Crystal sets lack local oscillators, so they cannot be detected in this way.

Edwin Howard Armstrong (18 December 1890 – 31 January 1954) was an American electrical engineer and inventor. He has been called "the most prolific and influential inventor in radio history".[2] He invented the regenerative circuit while he was an undergraduate and patented it in 1914, followed by the super-regenerative circuit in 1922, and the superheterodyne receiver in 1918.[3] Armstrong was also the inventor of modern frequency modulation (FM) radio transmission.

Edwin Howard Armstrong (18 December 1890 – 31 January 1954) was an American electrical engineer and inventor. He has been called "the most prolific and influential inventor in radio history".[2] He invented the regenerative circuit while he was an undergraduate and patented it in 1914, followed by the super-regenerative circuit in 1922, and the superheterodyne receiver in 1918.[3] Armstrong was also the inventor of modern frequency modulation (FM) radio transmission.

KS-15RD Low-Noise Superheterodyne Receiver Module - Green

KS-15RD Low-Noise Superheterodyne Receiver Module - Green

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Superheterodyne receiver - Wikipedia, the free encyclopedia

Superheterodyne receiver - Wikipedia, the free encyclopedia

Superheterodyne receiver - Wikipedia, the free encyclopedia

Superheterodyne receiver - Wikipedia, the free encyclopedia

1set RF module 433 Mhz superheterodyne receiver and transmitter Support ASK OOK small size low power kit For Arduino/ARM/MCU                  USD 1.98/pairUSD 2.50/pieceUSD 7.99/setUSD 1.25/pieceUSD 0.99/setUSD 7.60/setUSD 2.50/pieceUSD 9.20/piece  1set RF module 433 Mhz superheterodyne receiver and transmitter Support ASK OOK small size low power kit For Arduino/ARM/MCU    Package Included:    Receiver module    * 1pcs      ...    US $1.98…

1set RF module 433 Mhz superheterodyne receiver and transmitter Support ASK OOK small size low power kit For Arduino/ARM/MCU USD 1.98/pairUSD 2.50/pieceUSD 7.99/setUSD 1.25/pieceUSD 0.99/setUSD 7.60/setUSD 2.50/pieceUSD 9.20/piece 1set RF module 433 Mhz superheterodyne receiver and transmitter Support ASK OOK small size low power kit For Arduino/ARM/MCU Package Included: Receiver module * 1pcs ... US $1.98…

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