AD8367
http://www.analog.com/media/en/technical-documentation/data-sheets/AD8367.pdf
https://pl.aliexpress.com/item/AD8367-1-500MHz-RF-Broadband-Signal-Amplifier-Module-45dB-linear-Variable-Gain-Amplifier-AGC-VCA-0/32816823917.html
MAR-Y
http://www.vk6fh.com/vk6fh/MAR6%20based%20PRE-AMP.htm
http://www.changpuak.ch/electronics/mar_era_bias.php
http://www.analog.com/media/en/technical-documentation/data-sheets/AD8367.pdf
https://pl.aliexpress.com/item/AD8367-1-500MHz-RF-Broadband-Signal-Amplifier-Module-45dB-linear-Variable-Gain-Amplifier-AGC-VCA-0/32816823917.html
MAR-Y
http://www.vk6fh.com/vk6fh/MAR6%20based%20PRE-AMP.htm
http://www.changpuak.ch/electronics/mar_era_bias.php
433.500,145.550,70.260,439.550 Janusz, Barlinek JO72ox