Excellent exegesis from all contributors.
I believe we can go one step further... I believe some of his comments
are misplaced because they are completely gratuitous comments which are
not directly correlated to the exam questions, which means he has said
more than he needed to in the first place.
Go figure... there is nothing sacred... you just never know who you can
trust any more !
A good ham friend of mine just bristled when I once said something
negative about Gordon West study materials, as the other ham took
Gordo's class in person and knew him well living in LA. I am just
trying to figure out ham radio and maybe pass the next exam.
All of the comments in this thread are of interest to me as I am working
on a couple of antenna building projects, including some tubular
aluminum dipoles, vertical dipoles, and possibly a vertical ground
plane (necessitated because the tubing I purchased for the 20 meter alum
dipole sags and flexes too much... oops...) and I am trying to design
either a vertical ground plane or vertical dipole from the tubing.
================== James -K8JHR =======================
On 1/6/2011 7:46 AM, Steve Hunt wrote:
> The most directly relevant question is E9C15:
>
> What strongly affects the shape of the far-field, low-angle elevation
> pattern of a
> vertically polarized antenna?
> A. The conductivity and dielectric constant of the soil in the area of
> the antenna
> B. The radiation resistance of the antenna and matching network
> C. The SWR on the transmission line
> D. The transmitter output power
>
> The correct answer (A) doesn't define what is meant by "in the area of
> the antenna". To that extent it is a badly-worded question. Fortunately,
> you can arrive at answer A through a process of eliminating the others.
>
> However "Gordo's" advice contains no such ambiguity. He says: "Well,
> that would be the conductivity and dielectric constant of the soil in
> the area *just below the antenna*." [my emphasis]. That is plainly
> wrong, as we have seen.
>
> It seems a shame if students have to accept technical error in order to
> pass an exam.
>
> 73,
> Steve G3TXQ
>
>
>
> On 06/01/2011 12:11, geoffrey mendelson wrote:
>> On Jan 6, 2011, at 1:26 PM, Steve Hunt wrote:
>>
>>> ARRL Extra Class License Manual, Page 9-8 Effects of Ground and Ground
>>> Systems:
>>
>> <http://www.ncvec.org/page.php?id=351>
>>
>> Here is the actual question pool. You are welcome, if you wish, to
>> read through it and see which questions pertain to the subject, and if
>> they do, does the quote from "Gordo" or the competition (ARRL) help
>> you pass the test.
>>
>> Note that as far as I know, and I may be wrong, you can't challange a
>> test result based on the accuracy of a question. Anyone can challenge
>> a question in the pool, and if succcessful, the question will either
>> be deleted, amended or replaced, but until it is, answers that do not
>> match published correct ones will be counted incorrect and there is no
>> way to appeal.
>>
>> Geoff.
>>
> _______________________________________________
> TenTec mailing list
> TenTec@contesting.com
> http://lists.contesting.com/mailman/listinfo/tentec
>
_______________________________________________
TenTec mailing list
TenTec@contesting.com
http://lists.contesting.com/mailman/listinfo/tentec
|