.0625" (1/16") error in a 17.78" average element length is a 0.45% error.
WOW!
Perry K4PWO
-----Original Message-----
From: TowerTalk [mailto:towertalk-bounces@contesting.com] On Behalf Of
Lizeth Norman
Sent: Tuesday, April 14, 2015 7:55 AM
To: Peter Voelpel
Cc: towertalk
Subject: Re: [TowerTalk] Trash talk and M2
Hey Buddy!! Long time no hear!!
Last time you popped up, I was working on my KT-34a. Long, Long, time.
15 years, at least.
Take a look at the pics. 28 of 42 elements are mis cut. What's more, 9
mistaken pair are adjacent and 1/16" different. This leads to the wrong
element being the right size or the right element being the wrong size!!
Confuse-o-rama!!!
So how does one build an antenna with 42 elements when more than half of the
element measurements don't reflect the instructions?? Not possible. I
guessed putting it together based on the pattern of elements. The antenna is
a match at 50 Ohms. As I've said, the rest of the performance parameters are
anyone's GUESS!!!
Any guesses about performance from this antenna are just that, guesses.
Modelling will only get you so far. As I'm sure you're aware, what happens
in a computer model oftentimes is not what is seen in the real world, i.e.
antenna range.
Again, look at the pics. Any questions? Look again. I have a receipt for
almost $700. It does equal that amount if I add the round trip tolls.
So for $700 I get an antenna that's 50% wrong and unable to be built without
guessing? I bet you'd go for that!!
Norm n3ykf
On Tue, Apr 14, 2015 at 8:44 AM, Peter Voelpel <dj7ww@t-online.de> wrote:
> Why is a difference of a 1/16" of element length a disaster with an
> antenna to cover 430-438MHz?
>
> -----Original Message-----
> From: TowerTalk [mailto:towertalk-bounces@contesting.com] On Behalf Of
> Lizeth Norman
> Sent: Dienstag, 14. April 2015 14:30
> To: xaxaxaxa yayayaya
> Cc: towertalk
> Subject: Re: [TowerTalk] Trash talk and M2
>
> Hey Bill,
> Why don't you come visit? Brooksville is a hop, skip and jump from
> Ocala! See the disaster live. I'll be here most of the day.
>
> _______________________________________________
>
>
>
> _______________________________________________
> TowerTalk mailing list
> TowerTalk@contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
|