[TowerTalk] Beverage Antenna Mounted 12' Above Gorund

[Jim Brown]

Good analysis, Dave. Beverages depend on lossy soil underneath them to 
work, and, as we all know, soil varies widely from place to place, and 
even locally. I have very poor (rocky) soil, and the terrain under it in 
my woods is quite irregular. For example, my EU/VK reversible Bev starts 
at about 5 ft, running over the earth that drops gradually and then more 
steeply to to a creek, losing about 30 ft of elevation, then climbing up 
a steep rise to its termination point. Over that run, it's height above 
ground varies from five feet to 10-12 feet. For most of its length, it's 
held up by laying on top of brush.

As 160M super-op has often said, "any Beverage is better than no 
Beverage." His run through terrain at least as irregular as mine, and 
he's deep in a ravine!

I do, however, object to "RF ground," and so do authorities like N0AX 
and K6WX.

73, Jim K9YC

On 8/31/2021 7:58 PM, David Gilbert wrote:
> 
> Since actual RF ground could be almost anywhere (and could be definitive 
> or graded) depending upon your soil, practically speaking the difference 
> between 12' and 10' is a meaningless distinction.
> 
> The height above actual ground will of course moderately affect the 
> input impedance, but you're not going to know what that is ahead of time 
> and to be rigorous you would want to adjust the terminating resistance 
> for a more or less constant impedance as a function of frequency ... and 
> then set the turns ratio of the coupling transformer to match.
> 
> Personally, I think being THAT rigorous isn't all that rational. Put 
> your wire at 12' and use whatever input transformer and termination you 
> already planned.
> 
> 73,
> Dave   AB7E
> 
> 
> 
> On 8/31/2021 5:56 PM, RVZ via TowerTalk wrote:
>> Wondering if anyone has had good success with a Beverage mounted 12' 
>> above ground?  12' is the minimum clearance I need to safely clear a 
>> drive way.  Please reply direct as I hope to install tomorrow.
>>
>> Thanks in advance for your reply! 73, Dick- K9OMRLVZ at aol.com
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