Is it resonance that changes? I thought it was impedance.
73, Keith NM5G
-----Original Message-----
From: Don Havlicek [mailto:n8de@thepoint.net]
Sent: Friday, September 01, 2006 1:33 PM
To: Keith Dutson
Cc: towertalk@contesting.com
Subject: Re: [TowerTalk] C31 - 1 feed line or 3
When measuring the 'resonance' of an antenna at the shack, you are NOT
measuring the antenna's resonance .. you are measuring the resonance of the
antenna and feedline.
Remember .. the feedline SHOULD have NO effect, but it will, unless it is an
exact 1/2-wavelength multiple at the particular frequency at which you are
making measurements.
Don
N8DE
Keith Dutson wrote:
> What changes the resonance at the shack?
>
> 73, Keith NM5G
>
> -----Original Message-----
> From: towertalk-bounces@contesting.com
> [mailto:towertalk-bounces@contesting.com] On Behalf Of Don Havlicek
> Sent: Thursday, August 31, 2006 10:24 PM
> To: N2TK, Tony
> Cc: 'Ron Feutz'; towertalk@contesting.com
> Subject: Re: [TowerTalk] C31 - 1 feed line or 3
>
> Where did you make those measurements?
>
> If at the shack end of the coax, they are quite meaningless as to
> antenna resonance.
>
> The only way to get the correct measurements is AT THE ANTENNA.
>
> Sorry, but too many guys/gals put their SWR meters at the shack end of
> the coax and try to determine what the ANTENNA looks like from there.
>
> It just doesn't work that way.
>
> Don
> N8DE
>
> N2TK, Tony wrote:
>
>>Ron,
>>Mine resonates at
>>
>>28.64 - 1.1:1
>>21.22 - 1.25:1
>>14.1 - 1.2:1
>>
>>Single feed.
>>
>>N2TK, Tony
>>
>>
>>-----Original Message-----
>>From: towertalk-bounces@contesting.com
>>[mailto:towertalk-bounces@contesting.com]On Behalf Of Ron Feutz
>>Sent: Friday, September 01, 2006 10:02 AM
>>To: towertalk@contesting.com
>>Subject: [TowerTalk] C31 - 1 feed line or 3
>>
>>TT'ers,
>>
>>I just ordered an F12 C31XR. I have been told by experienced users
>>that the beam can be a pain to tune properly on 15 (high swr).
>>
>>I ordered the beam with single feed. Since then I have heard that the
>>problem is less severe with the 3 feedline model.
>>
>>All inputs from experienced users will be welcomed.
>>
>>Thanks and 73,
>>
>>Ron KK9K
>>
>>_______________________________________________
>>
>>
>>
>>_______________________________________________
>>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
>
> _______________________________________________
>
>
>
> _______________________________________________
> 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
|