K9AY++ RX antenna system with BPFs, Preamp, Controller and much more

wiki acessories order

The K9AY is terminated loop. It consists of a wire loop of any convenient shape (diamond, delta, etc), hung from a single support and with a ground rod at the bottom. A 9:1 impedance-matching transformer is connected from one end of the loop to the ground and a terminating resistor is connected the other end of the loop to the ground. This antenna is directional. Favoring signals are arriving from the feed point end. You can also change the antenna far field by changing RLOAD (RTERM) of the loop. This set including the RF feeder box and the controller.

Main functions:

RF feeder box:


K9AY++ system includes:

All parts

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


Users' photos

by Laci HA7JTR-HA7I

by Laci HA7JTR-HA7I

by Laci HA7JTR-HA7I


RF BOX Manual in WiKi WiKi for RF BOX
rev 1.8 sch pcb eagle104
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

Design & code ok1hra | Copyleft 2013-2020 | License