K9AY feeder with BPF

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!What is inside *There is PCB in the feeder box which is assembled with Direction switch relays, Rload system (fixed and variable), Impedance transformer, Band Pass Filters, Preamplifier with Variable Attenuator, Protections and Common-mode filters. [https://remoteqth.com/img/ZAW-WIKI/k9ay++new/k9ay_inside_new_850.jpg|noborder]
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