|
|
 Up |
  |
Author: ArthurUnwinArthurUnwin Date: Mar 7, 2008 09:28
I have searched quite a bit for evidence that states that performance
of antennas can be rated by it's size. Formulas do not refere to
radiator size or volume
and aparture is referenced to gain. I understand that sort of thinking
based on Yagi design
but the idea that all small radiators are inefficient is rather
ludicrouse. My work, based on
the sciences of the masters, show that a efficient radiator can be any
size,shape and
configuration as long as it
is in equilibrium . Period
No where can I find reference to "size" in what the masters state
Regards
Art
|
| |
| 189 Comments |
|
|
Author: Jim LuxJim Lux Date: Mar 7, 2008 09:46
> I have searched quite a bit for evidence that states that performance
> of antennas can be rated by it's size. Formulas do not refere to
> radiator size or volume
> and aparture is referenced to gain. I understand that sort of thinking
> based on Yagi design
> but the idea that all small radiators are inefficient is rather
> ludicrouse. My work, based on
> the sciences of the masters, show that a efficient radiator can be any
> size,shape and
> configuration as long as it
> is in equilibrium . Period
> No where can I find reference to "size" in what the masters state
> Regards
> Art
|
| Show full article (1.50Kb) |
| no comments |
|
|
Author: Richard HarrisonRichard Harrison Date: Mar 7, 2008 12:08
Art wrote:
"No where can I find reference to "size" in what the masters state"
More diligence!
Terman never failed to have an answer for me. On page 864 of his 1955
0pus he writes:
"The simplest wire radiator or antenna is the elementary doublet shown
in Fig. 23-1a. This consists of a conductor...
|
| Show full article (1.49Kb) |
| no comments |
|
|
Author: Art UnwinArt Unwin Date: Mar 7, 2008 13:54
On Mar 7, 2:08 pm, richardharri...@ webtv.net (Richard Harrison) wrote: > Art wrote:
>
> "No where can I find reference to "size" in what the masters state"
>
> More diligence!
>
> Terman never failed to have an answer for me. On page 864 of his 19550pus he writes:
>
> "The simplest wire radiator or antenna is the elementary doublet shown
> in Fig. 23-1a. This consists of a conductor of length small-delta l that
> is short compared with the wavelength lambda, and which is assumed to
> have such large capacitance areas associated with each end that current
> flowing throughout the length of the doublet everywhere has the same
> value I. The strength E of the field radiated from such an elementary
> antenna in volts per unit length by a current I cos (omega t + 90
> degrees) is given by the formula
> E = 60 pi/d l/lambda Icos theta cos omega (t-d/c)
> Eqn. (23-1)
> Here d is the distance from the doublet to a distant receiving point P, ...
|
| Show full article (4.04Kb) |
| 2 Comments |
|
|
Author: DaveDave Date: Mar 7, 2008 14:45
> On Mar 7, 2:08 pm, richardharri...@ webtv.net (Richard Harrison) wrote:
> I disagree. Laws written are all based on the assumption of
> equilibrium and that includes
> Maxwell's laws. These laws hav e zero refernce to size as such though
> many would seek
because contrary to what those male enhancement product adds tell you, size
doesn't matter.
> for the word volume. Pertinent factors are wave length of frequency in
> The problem here is that amateur radio is wellded to the yagi design
> which is not one of equilibrium
WAIT JUST ONE GOSH DARN MINUTE! you have said in the past that the simple
half wave dipole WAS a prefect example of equilibrium! NOW it isn't???
have you had a new revelation while i had your old email address plonked??
|
| |
| no comments |
|
|
Author: Art UnwinArt Unwin Date: Mar 7, 2008 15:09
On Mar 7, 4:45 pm, "Dave" nowhere.com> wrote:>> On Mar 7, 2:08 pm, richardharri...@ webtv.net (Richard Harrison) wrote:
>> I disagree. Laws written are all based on the assumption of
>> equilibrium and that includes
>> Maxwell's laws. These laws hav e zero refernce to size as such though
>> many would seek >
> because contrary to what those male enhancement product adds tell you, size
> doesn't matter.
>
>> for the word volume. Pertinent factors are wave length of frequency in
>> The problem here is that amateur radio is wellded to the yagi design
>> which is not one of equilibrium
>
> WAIT JUST ONE GOSH DARN MINUTE! you have said in the past that the simple
> half wave dipole WAS a prefect example of equilibrium! NOW it isn't??? ...
|
| Show full article (1.66Kb) |
| no comments |
|
|
Author: Richard HarrisonRichard Harrison Date: Mar 7, 2008 15:54
Art wrote:
"I sisagree."
Most correspondents here know from experience that radiation efficacy
falls in too-short antennas.Terman refers to E.A. Laport`s "Radio
Antenna Engineering". Laport has charted Degree-amperes versus Field
Strength or radiation resistance to which Field Strength is
proportional.
Laport gives an example on page 23:
"A straight vertical radiator of height 30 degrees or less has a
radiation resistance Rr following the equation
Rr = Go squared.
where Go is the electrical height in radians (One radian is 57.3
degrees.)
Best regards, Richard Harrison, KB5WZI
|
| |
| no comments |
|
|
Author: DaveDave Date: Mar 7, 2008 16:02
> On Mar 7, 4:45 pm, "Dave" nowhere.com> wrote:>>> On Mar 7, 2:08 pm, richardharri...@ webtv.net (Richard Harrison) wrote:
>>> I disagree. Laws written are all based on the assumption of
>>> equilibrium and that includes
>>> Maxwell's laws. These laws hav e zero refernce to size as such though
>>> many would seek >>
>> because contrary to what those male enhancement product adds tell you,
>> size
>> doesn't matter.
>>
>>> for the word volume. Pertinent factors are wave length of frequency in
>>> The problem here is that amateur radio is wellded to the yagi design
>>> which is not one of equilibrium ...
|
| Show full article (1.72Kb) |
| no comments |
|
|
Author: Art UnwinArt Unwin Date: Mar 7, 2008 16:11
On Mar 7, 6:02 pm, "Dave" nowhere.com> wrote:>> On Mar 7, 4:45 pm, "Dave" nowhere.com> wrote:>>> "Art Unwin" gmail.com> wrote in message>
>
>>>> On Mar 7, 2:08 pm, richardharri...@ webtv.net (Richard Harrison) wrote:
>>>> I disagree. Laws written are all based on the assumption of
>>>> equilibrium and that includes
>>>> Maxwell's laws. These laws hav e zero refernce to size as such though
>>>> many would seek >
>>> because contrary to what those male enhancement product adds tell you,
>>> size ...
|
| Show full article (1.89Kb) |
| no comments |
|
|
Author: Brian KellyBrian Kelly Date: Mar 7, 2008 16:13
On Mar 7, 6:09 pm, Art Unwin gmail.com> wrote:> On Mar 7, 4:45 pm, "Dave" nowhere.com> wrote:
>
>
>
>
>
>
>>> "Art Unwin" gmail.com> wrote in message>
>
>>> On Mar 7, 2:08 pm, richardharri...@ webtv.net (Richard Harrison) wrote:
>>> I disagree. Laws written are all based on the assumption of
>>> equilibrium and that includes
>>> Maxwell's laws. These laws hav e zero refernce to size as such though
>>> many would seek >
>> because contrary to what those male enhancement product adds tell you, size ...
|
| Show full article (2.10Kb) |
| no comments |
|
RELATED THREADS |
|
|
|
|
|
|
|
|
