Topband: K9ay loop not performing

donovanf at donovanf at
Sat Dec 7 18:18:47 EST 2019

Hi Pete, 

If your K9AY is near your transmitting antenna, it may be re-radiating 
signals into the K9AY loops. You may need to use a relay to detune 
the transmitting antenna while receiving, typically my lifting the connection 
to between the coax and the antenna 


----- Original Message -----

From: "Alan Swinger" <awswinger at> 
To: "Lloyd - N9LB" <lloydberg at>, "N4ZR" <n4zr at>, "topband reflector" <Topband at> 
Sent: Saturday, December 7, 2019 10:19:51 PM 
Subject: Re: Topband: K9ay loop not performing 

I also put out radials on my K9AY loop and also did what ON4UN suggested re common mode - per his book - another grd rod about 8 ft (or so) from the loop base with coax shield grounded to it. I also used a coax piece w/ ferrite beads (from DX Eng) to connect from the ant to the grd rod and feedline. It has worked as advertised for many yrs. If not done, suggest chck it w/ AM bcst stations for directivity. 
73 - Alan K9MBQ 

-----Original Message----- 
>From: Lloyd - N9LB <lloydberg at> 
>Sent: Dec 7, 2019 4:26 PM 
>To: 'N4ZR' <n4zr at>, 'topband reflector' <Topband at> 
>Subject: Re: Topband: K9ay loop not performing 
>Pete, I had the very same problem here. 
>I have very poor soil, mostly a painted on layer of top soil, several inches of clay, a couple of feet of sand, and then bedrock. 
>Gary - K9AY told me that for poor soil conditions I needed to put a ground radial directly under each loop and attach them to the center ground rod. Length of the radials should extend a few feet past the edge of each loop. 
>Lloyd - N9LB 
>-----Original Message----- 
>From: Topband [mailto:topband-bounces at] On Behalf Of N4ZR 
>Sent: Saturday, December 07, 2019 3:14 PM 
>To: topband reflector <Topband at> 
>Subject: Topband: K9ay loop not performing 
>I just put up a K9AY loop, using the Array Solutions control boxes, and am pretty disappointed. There is no audible or visible difference in the noise level, while the received signal strength is down whenever I A/B it with my inverted L. There does seem to be a little directivity, but not much, and subjectively I find that weak signals are all heard better on the transmit antenna. Judging by results in the current contest, I've got an alligator on my hands! 
>The preamp amplifies by a couple of S units, and I can hear the relays out at the antenna switching when I change directions or termination resistances, although gain and directivity do not change noticeably. 
> From this I assume there's nothing wrong with the electronics 
>I tried to do my installation "by the book." Ground is provided at the base of the antenna by a 6-foot ground rod. There are two common-mode chokes on the feedline, one at each end of approximately 100 feet of RG-6. About the only deviation from the published design is that the top of the crossed loops is at 28 feet, not 25, and the loops have their bases more or less horizontal, where the published designs show them tilting upward approximately 15-20 degrees from the center in each direction. I can make that happen with some more rigging, but before I do that, I'm looking for suggestions of other places to look for the problem. 
>73, Pete N4ZR 
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