K9AY simply loops switch

This is simply K9AY feeder box with direction switch, variable and fixed Rload and protections. Coaxial output has got common-mode current filter. 

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105.27 € (tax incl.)
105.27 €
87.00 € (without tax)
  • F
  • PL
in stock, shipped in 2-3 days

Price history     Price history

The lowest price in the 30 last days was 105.27 €

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This 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 for the loop to the ground and 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. There, with the two loops, you can switch between four directions. You can also change the antenna far field by changing the RLOAD (RTERM) of the loop.


  • Lower noise RX antenna
  • RX antenna designed for FOUR directions
  • Small design
  • Ideal for portable operation
  • Noise source antenna for QRM eliminator

Main functions

  • Broadband - 0.2 to 30 MHz
  • 4 directions about 110 deg.
  • Needs small room
  • Great for portable operations
  • 50 or 75 Ohm feed line - jumper switch inside
  • Good for phasing more pics into the array
  • ONE version - Variable and Fixed load resistor - by the Jumper on PCB
  • Common-mode coax choke included
  • ONLY FEEDER! WITHOUT CONTROLLER - you can use this controller
  • High voltage electrostatic protection with neon lamps
  • High power IN/OUT protection with PTC
  • Controlled by DC voltage (external wires) or AC/DC voltage over the coax feed line - more info
  • Variable terminator resistance (Rload) also by external DC voltage
  • High quality connectors
  • Stainless screws
  • IP56 box - recommended to protect it against water
  • Feeder size 100x100 mm


  • RX antenna - Gain depends on loop size
  • Four directions about 110 degrees
  • F/B depends on loop size and construction
  • Find more design hints (phased array)
  • Fixed or Variable termination resistor
  • Feed line impedance 50 or 75 Ohm
  • Common-mode choke isolation more than 30 dB
  • Current protection > 100 mA and Voltage protection > 65 V
  • Control AC/DC voltage 11 - 14 V
  • Control AC/DC current < 200 mA
  • Rload voltage DC about 1.5 to 6 V and 30 mA

Available as

ASSEMBLED: ready to use
Connectors: PL SO-239 or F


Included in package

K9AY assembled and tested


If you want to know more please check our wiki with K9AY simply manual.

version with PL SO-239 connectors

k9ay simply loops switch pl so-239 assembled qro.cz hamparts.shop

version with F connectors

k9ay simply loops switch  f assembled qro.cz hamparts.shop

k9ay rx antenna direction matrix table qro.cz hamparts.shop

k9ay simply loops switch direction matrix table rx antenna qro.cz hamparts.shop

recommendations to buy rx audite sdr splitter switch by qro.cz hamparts.shop

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Product Details

Data sheet

in enclosure
both 50 & 75 Ohm
front-end protection
frequency range
0.2 MHz to 30 MHz
without controller
product dimensions
100x100x50 mm - PU box IP56
product weight (brutto)
0.45 (F), 0.48 (PL) kg
package dimensions
18.5x14x10.5 cm

Specific References

k9ay how to build
pdf file about how to build the K9AY loop receiving antenna by Gary Breed, K9AY
Download (56.69KB)
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