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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…

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.

1set 2pcs superheterodyne 433Mhz RF transmitter and receiver Module kit small size low power for Arduino/ARM/MCU diy kit 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 2pcs superheterodyne 433mhz rf Wireless transmitter and receiver Module kit small size low power For Wireless Power switch socket remote control LED electric doors Etc. Package Included: ... US $0.99…

from DX.com

Geeetech Superheterodyne 3400 Receiver + 433MHz RF-sändare Kit

Geeetech Superheterodyne 3400 Wirelesss Receiver + 433MHz RF Transmitter Kit - Green. The kit is consisted of transmitter and receiver, popular used for remote control. TX Technical Specifications: 1. Working voltage: 3V~12V 2. Working current: max 40mA (12V), min9mA(3V) 3. Resonance mode: sound wave resonance (SAW) 4. Modulation mode: ASK /OOK 5. Working frequency: 315MHz-433.92MHz, customized frequency is available. 6. Transmission power: 25mW (315MHz at 12V) 7. Frequency error: +150kHz…

Edwin H. Armstrong portable superheterodyne receiver, the world's first portable radio.

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