Topband: K9AY over rocky ground

Mon Sep 10 16:27:01 EDT 2007

Jeff Maass pisze:
>  
>> -----Original Message-----
>> From: topband-bounces at contesting.com 
>> [mailto:topband-bounces at contesting.com] On Behalf Of Björn Mohr
>> Sent: Saturday, February 10, 2007 5:19 AM
>> To: 'Topband'
>> Subject: Topband: K9AY over rocky ground
>>
>> I have a K9AY that I would like to try at my mountain QTH. I 
>> am on the top where there is little or no soil, just bare 
>> rock. I have seen references to using the K9AY over rocky 
>> ground using 4 radials laid out on the ground.
>> What kind of performance should I expect in a situation like 
>> this? How long radials should I use?
>>
>> 73 de Björn /SM0MDG
>>
> 
> G'day Bjorn:
> 
> On Curacao, at PJ2T, the soil is a few inches
> deep over coral rock, I was not happy with the
> performance of a K9AY installed over twelve
> 30-foot radials.
> 
> In January, we installed (Field Day style) a 
> DX Engineering 4-square RX antenna system. The 
> active vertical whips require ground, and we tried
> six 30-foot radials under each. In this case, the
> antenna worked very well for us, providing amazing
> front-to back (nulling out the USA to allow us to
> hear South Americans better.
> 
> The bottom line is that you cannot know how the 
> K9AY will perform for you in your environment
> unless you try it. "Any RX antenna is better than
> no RX antenna", and "More are better".
> 
> We migrated to flag/pennant RX antennas in place
> of the K9AT at PJ2T, which have proved over the
> past several years to work well over the lousy
> ground, as do our two permanent Beverages.
> 
> 73,  Jeff  K8ND
> 
> 
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> 
Jeff the next step should be 4sqK9AY
http://www.sp3key.com/klub/k9ay_160_en/index.html
and second link
http://www.sp3key.com/klub/k9ay_pro/index_en.html

Much much quiter to static (closed loop)
better F/B
better F/S
one design work wel on 80/40 mtr or 160/80 mtr


73, Joe, SP9P