The vertical elements are all shifted along the boom relative to the
horizontal ones. Therefore a vertical and horizontal element which are
adjacent to one another are not necessarily a "pair" and will be different
lengths (or in some cases the same - to really confuse the issue).
Does this help to explain the anomaly you are seeing ? Do study the
dimension sheet very carefully before cutting anything - it's so awkward
sticking all that swarf back on again !
John G4ZTR
-----Original Message-----
From: TowerTalk [mailto:towertalk-bounces@contesting.com] On Behalf Of
Lizeth Norman
Sent: 13 April 2015 19:19
To: TexasRF@aol.com
Cc: towertalk
Subject: Re: [TowerTalk] More from the M2 antennas quality control file
Gerald,
The element lengths do not correspond to the callouts on the
instructions. That's 28 of 42 elements. More than a 50% screw up rate.
So how does one know what element goes where in that case? Perhaps you
can enlighten me. Crystal ball? ESP? Pig entrails? Call a psychic?
This is a super big deal!!!
If you think that's cool for $700, buy away!
Using the tools in my garage, with the skillset my uncle taught me, I
can do better. Coming from a manufacturer that "prides" themselves on
"quality" and has a real factory, this is worse than abysmal.
I was paying attention in engineering class when the prof discussed
six sigma. If they've let one get out of the corral, there's more
where that came from.
Say, Don't you sell these? If I were you, I'd be very, very, careful.
They don't have any warranty other than their "Quality". I've proven
that to be nonsense.
Math class taught me that to prove something false, I had to do it only
once.
Feel free to follow the original link to flickr page.
Norm n3ykf
On Mon, Apr 13, 2015 at 2:03 PM, <TexasRF@aol.com> wrote:
> Norm, this may be out in left field but I have been there before. Some
> vhf/uhf yagis don't have the longest element as the reflector; the d.e. is
> actually the longest element. Could this be the case with your antenna?
>
> Also, an error of 1/16" at 440MHz is only about 1/2 of a percent. The
error
> is not present on all of the elements so the effect will be very minor
> differences of some of the lobes as seen on a computer generated pattern
> plot. These lobes are already well suppressed so minor changes are
basically
> irrelevant. They may even be improved.
>
> You mentioned the elements are longer than expected. If you are truly
> concerned you could trim them with a file or better yet a belt sander.If
you
> do that, the chamfered ends should be restored as that also has an effect
on
> the electrical length.
>
> This sounds like a non-problem.
>
> 73,
> Gerald K5GW
>
>
>
>
>
>
> In a message dated 4/13/2015 11:50:17 A.M. Central Daylight Time,
> normanlizeth@gmail.com writes:
>
> Patrick,
> There is no possibility of being wrong measuring these. Used an
> adjustable (tongue) square to get a correct length measurement.
>
> .com/mailman/listinfo/towertalk
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