Topband: Lab style comparison results on 160m small lot antennachanges.

[DAVID CUTHBERT]

Tests to answer the question "is the FCP better than counterpoise X" can be
answered by 28 MHz scale models.

The question "the FCP is better at 1.8 MHz by Y dB" cannot be answered by
28 MHz scale models.

What question do we really need answered?

Dave WX7G
On Dec 21, 2012 11:30 AM, "Tom W8JI" <w8ji at w8ji.com> wrote:

>
> ----- Original Message ----- From: "Guy Olinger K2AV" <
> olinger at bellsouth.net>
> To: "TopBand List" <topband at contesting.com>
> Sent: Thursday, December 20, 2012 7:25 PM
> Subject: Topband: Lab style comparison results on 160m small lot
> antennachanges.
>
>
>  A prior poster, lamenting the nature of FCP success reports, wrote:
>>
>> "Who has done that, with only a radial change, against an unchanged
>> reference antenna that is in the far field of the antenna under test.
>> [Where's the post with the details] ?"
>>
>> Perfectly logical question.  We all would like that answered with posts
>> listing lab grade experiments.
>>
>
>
> Because of antenna size, laboratory measurements are impossible on lower
> bands. For that reason we can't make lab-style comparisons.
>
> There is one thing, though, that we probably all agree on.
>
> If more than one thing that can affect results changes in an unknown way
> in any test or experiment, like the ionosphere or reworking an entire
> antenna system from less-than-good system to a new one, we really don't
> know what caused the change or if any one particular thing was responsible
> for the change.
>
> If we A-B against any unchanged reference, we at least know which was
> better than the reference and how much better. None of this requires a lab,
> precise equipment, is unreasonable, or is in the most remote way unfair. It
> just requires reasonable methods.
>
> 73 Tom
> ______________________________**_________________
> Stew Perry Topband Distance Challenge coming on December 29th.
>