[TowerTalk] lp V stepIR

[Jim Chaggaris]

Why? It's a great discussion (and on topic) and a lot more interesting than
some of the other dribble that's been posted.

Jim N9WW

-----Original Message-----
From: towertalk-bounces at contesting.com
[mailto:towertalk-bounces at contesting.com] On Behalf Of Robert
Sent: Sunday, January 24, 2010 5:11 PM
To: Tower and HF antenna construction topics.
Subject: Re: [TowerTalk] lp V stepIR


Can this dialogue be continued elsewhere, like perhaps to a more appropriate

LP reflector?


----- Original Message ----- 
From: "Gene Smar" <ersmar at verizon.net>
To: "Tower and HF antenna construction topics." <towertalk at contesting.com>
Sent: Sunday, January 24, 2010 11:16 AM
Subject: Re: [TowerTalk] lp V stepIR


> Gents:
>
>     Fig. 5 in the URL is a good depiction of how only a few of the total
> elements are actually active on any one frequency.  If one could run 
> similar
> models for increasing frequencies across the design BW of the LP one would
> see the peak current move from the back of the LP (longer elements) 
> towards
> the front.  It is for this reason that the gain of an LP is considerably
> lower for a given boom length than a similar Yagi - only a few elements 
> out
> of the six or eight or ten are active at a time.  However, the SWR is
> maintained at a low level throughout the entire BW, the main advantage of
> LPs over Yagis.
>
> 73 de
> Gene Smar  AD3F
>
>
> ----- Original Message ----- 
> From: "jimlux" <jimlux at earthlink.net>
> To: "Tower and HF antenna construction topics." <towertalk at contesting.com>
> Sent: Sunday, January 24, 2010 1:30 PM
> Subject: Re: [TowerTalk] lp V stepIR
>
>
>> Stuart Browne wrote:
>>> Has anyone built an inverted LPDA?  Not practical unless you have the
>>> land
>>> and towers to support it but looks cheap to build and rugged. If you had
>>> the
>>> height it looks practical for 7-30 mhz.
>>>
>>>
http://plasma.newcastle.edu.au/plasma/research/tiger/venice/Inv_V_antenna_pa
per.pdf
>>>
>>> Stu,
>>> WH6H
>>>
>>
>> This kind of thing is a mainstay of the commercial HF broadcasting
>> world.. take a look at the TCI website.  They even make ones that
>> rotate! (you move the base around)
>>
>> A HF broadcast station near me (KVOH) has something that looks much like
>> this, using two towers.
>> _______________________________________________
>>
>>
>>
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