[TowerTalk] Beverages and verticals

[Bob Shohet, KQ2M]

I used to have a beverage to the South that ran downhill.  I believe that it had enhanced performance compared to a similar length South beverage a few years earlier on flat ground 1000’ closer to my house.  The “downhill” beverage seemed to have less qrn and generally lower noise and was sharper in pattern – it was also - but that is anecdotal - as grounding, type of ground, height above ground, straightness, absence of trees brush and other obstacles, quality of termination, etc. may all have affected the performance in a positive way – or not.

I would think that the slope of the hill would have to affect performance as you are changing the predominant receiving angles of the antenna as compared to the same beverage over flat ground.  But it probably also matters what the normally wave arrival angles relative to the beverage.  If you are looking for South America, those signals will usually be more high angle in nature as compared to direct path Southeast Asia.  So if you have a dropoff toward SA you will see less of a difference (enhancement) than if your dropoff is toward the North.   I know that with 4-squares, a sharp dropoff in one direction usually experiences an enhancement on lower angle signals on receive and transmit in that favored direction.   

If you have the ability to put up 2 identical beverages spaced ~ 150 – 200’ apart and “stack” them, you will significantly sharpen the pattern, reduce noise and hear better at lower arrival angles. 

73

Bob  KQ2M

From: Joe Giacobello, K2XX via TowerTalk 
Sent: Sunday, March 19, 2017 12:23 PM
To: jim at audiosystemsgroup.com 
Cc: towertalk at contesting.com 
Subject: Re: [TowerTalk] Beverages and verticals

Many years ago, when I put a similar question to the Top Band forum, I 
was told by several respondents that running a Beverage down a hill had 
little effect on its performance.  FWIW.

73, Joe
K2XX

Jim Brown wrote:
>> The NE/SW run will be running pretty evenly downhill and will drop 
>> from around 1150 feet to around 1000 feet above sea level.  While 
>> this is great for a Yagi, how will it affect the Beverage going 
>> downhill?  Conversely, how will the rise of 150 feet affect the 
>> Beverage in the opposite direction?
>
> Mine are bi-directional and terminate into a rise in one direction, 
> more or less flat in the other. Since I have no reference it's hard to 
> say whether that matters.
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