K9AY Antenna Projects
Receiving antennas for radio amateurs
The K9AY terminated loop is a popular receiving antenna, especially for the low bands like 160m, 80m, and 40m. Hams often build this compact directional antenna to improve reception and reduce noise, which is crucial for hearing weak DX signals on the lower frequencies. Its design allows for good directivity and a relatively small footprint, making it suitable for stations with limited space.
Operators can find numerous antenna projects and construction details for building their own K9AY loops, including variations like the Flag, Pennant, and Ewe designs. Many resources provide schematics for the control box, preamplifier, and bandpass filters needed to optimize performance. There are also examples of homebrew K9AY mast projects and discussions on integrating these receiving antennas with band splitters for multi-band operation.
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K9AY receiving antennas for PA6Z made by PA9M -
Gary Breed, K9AY experience with beverages on 40 meters -
This PDF document provided by AT technologies explains how to build the K9AY loop receiving antenna. -
A K9AY loop antenna project done with Far Circuits pc boards for the antenna switch and bandpass filter and preamp by K7SFN -
Elongated Terminated Loops, usage and details by K9AY Lewallen -
Martin Francis NDB K9AY mast project, with pictures and homebrewing details -
K9AY loop antenna installed at PA6Z Contest group. This is a receiving antennas for the low bands (160m, 80m and 40m). Include schematics and info on a building the control box, preamplifier and low-pass filter -
A compact directional receiving antenna -
A low-band receiving antenna that can fits in a 30-foot circle