RF Preselector or not? tiny SCR Heros Tech. Icom DIGISEL Yaesu VRF Harris RF-551A

RF Preselector: New tiny SCR Preselector 1.8MHz to 30MHz Tunable Band Pass Filter Assembled and kit versions. – tiny SCR Preselector (SCR) Software Controlled Radio via USB or I2C Bus (16 bits standard I2C serial bus interface) Made by Heros Technology Ltd in the United Kingdom.
It can be looped between RX OUT and RX IN of the HF Trancseiver, or SDR Receiver.  – A large toroid core T-200-7 is used, the large core offers a non-loaded Q (efficiency) value. A five bands tuneable Band-Pass Filter bank make up the core of the tiny SCR Preselector, and five telecom grade relays for band switching are connected to its corresponding section of the coil through the Band Selector control on the program software

See the Links and  following image – Preselector or not? Icom Digisel, Yaesu VRF ….

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