[ARC5] FCC General exam

[Dennis Monticelli]

Hmmm.  I was curious so I went to the ARRL antenna book (1994, Dean Straw,
Editor) and it says "At night the F1 layer disappears and the F2 layer
height drops somewhat."  Page 23-15.  Perhaps that book is the source of
the answer pool for the exam.  But it's an ambiguous question anyway
because there are multiple layers and they all change between night and
day.  One could argue that with the dissipation of the D, E, and F1 layers
at night, the AVERAGE height of the ionosphere increases at night.

Dennis AE6C


On Sun, Nov 24, 2013 at 3:25 PM, Fuqua, Bill L <wlfuqu00 at uky.edu> wrote:

>   Well, the F1 and F2 layers are at a lower altitude in the day and merge
> into
> the F layer at a much higher altitude at night.
>   So the answer should be B.
>   The propagation depends greatly on frequency.
> Find some reference to the ionosphere via google or book.
> 73
> Bill wa4lav
>
> ________________________________________
> From: Geoff [geoffrey at jeremy.mv.com]
> Sent: Sunday, November 24, 2013 6:07 PM
> To: Fuqua, Bill L; ARC 5
> Subject: Re: [ARC5] FCC General exam
>
> ----- Original Message -----
> From: "Fuqua, Bill L" <wlfuqu00 at uky.edu>
> To: "ARC 5" <arc5 at mailman.qth.net>
> Sent: Sunday, November 24, 2013 5:10 PM
> Subject: [ARC5] FCC General exam
>
>
> >  Here is a question that I believe they have wrong on the General Exam.
> >  What is the answer with out looking it up.
> >
> > G3C02 Where on the Earth do ionospheric layers reach their maximum
> height?
> > A. Where the Sun is overhead
> > B. Where the Sun is on the opposite side of the Earth
> > C. Where the Sun is rising
> > D. Where the Sun has just set
>
>
> I would choose D. Where the Sun has just set
> If discussing the E layer anyway.
>
> Carl
>
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