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

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The K9AY is terminated loop RX antenna. 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. Antenna has got Band Pass Filters and Preamplifier in the feed point of the loops. It is advantage of filtering and amplification small signals directly from antenna. 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:

Controller:

Parameters:

Antenna feeder block diagram:


K9AY matching unit

Controller block diagram:


K9AY controller block diagram

K9AY++ system includes:


All parts

Optional Common-mode current choke for coax and control cable


CMCC-CTRL for K9AY++

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

Videos


Users' photos


by Laci HA7JTR-HA7I

by Laci HA7JTR-HA7I

by Laci HA7JTR-HA7I

Download

K9AY
RF BOX Manual in WiKi WiKi for RF BOX
CONTROLLER Manual in WiKi WiKi for CONTROLLER
rev 1.8 sch pcb eagle115
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