K9AY/4-way beverage RX antenna CONTROLLER - classic/remote

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This is universal controller for 4 directional RX antenna. You can control directions of antenna by DC voltage or you can use internal Bias Tee and apply AC/DC voltage to RX antenna coax. Jumpers inside allow you to set right voltage combinations. There are front end protections, HPF for AC noise blocking, three Band Pass Filters, Preamplifier and RX way switch. Thanks to this switch, you can use RX antennas with any TRX - you do not need RX ANT IN connector at your TRX. Rload knob changes DC voltage from about 6 to 1,5V and you can use it with K9AY feeder and change loop termination resistance. Version REMOTE has got also possibility to control these features by the external controller.

Main functions:


K9AY controller description

Controller Block diagram CLASSIC / REMOTE version:

K9AY matching unit

K9AY controller block diagram


Example for controller with 4-way beverage system and simply K9AY loop antenna:

Controller comparison CLASSIC / REMOTE version:

K9AY 4-way controller comparation

Controller comparison for K9AY++ and 4-way system - THIS PAGE IS ABOUT THE LEFT one:

K9AY comparation


Technical articles:

Example of the Remote Control with external IP relays:

REMOTE CONTROL directly compatible with OL IP 12:

OLI IP 12 remote

REMOTE CONTROL directly compatible with REMOTIUS 64:

REMOTIUS 64 remote

OLI IP 12 remote

One cable needed:


Band Pass Filters characteristic:

160m BPF

80m BPF

40m BPF

Band Pass Filters characteristic with preamplifier:

160m BPF with preamp

80m BPF with preamp

40m BPF with preamp

BYPASS with preamp


Manual page for versions: < 2022 > 2022
Front Panel board rev. 1.2 RC sch pcb pcb
Controller connector board rev. 3.2 sch pcb 266
RX/TX switch board rev. 1.1 sch pcb 296
Internal BPF and Preamp board rev. 1.3 sch pcb
We believe open source is a better way of doing things.
View and download the Shield Schematic and PCB Kicad/Eagle CAD files,
LibreCAD .DXF, or Inkscape .SVG files.
The hardware designs are released under the
Attribution-NonCommercial 2.0 Generic

Related products - to complete RX system:

Bi-dir beverage atenna - ONE coax output More: link

4-way beverage switch More: link

K9AY simply feeder More: link

Option - Common-mode current choke to ham shack: Link to CMCC


CMCC 1 to 3 port