[aprssig] Scaling APRS antenna

[Glenn Little WB4UIV]

You can just change the element lengths, but, the pattern will not be as 
expected.

If you can accept the SWR, just leave it as it is since you cannot change 
the spacing of the elements and get everything at the correct spacing.

Without changing the spacing between the elements, even if you did get the 
element length correct, you would have unexpected lobes and less gain than 
advertised.




73
Glenn
WB4UIV

At 05:48 PM 09/18/04, Andrew Rich wrote:
>Thats the thing the elements and boom are stailness steel and welded.
>
>dough
>
>-----Original Message-----
>From: Glenn Little WB4UIV [mailto:glennmaillist at bellsouth.net]
>Sent: Sunday, 19 September 2004 5:17 AM
>To: vk4tec at tech-software.net; TAPR APRS Mailing List
>Subject: Re: [aprssig] Scaling APRS antenna
>
>
>You will need to change the spacing as well as the element lengths.
>
>This web site has some data and pointers to other web sites:
>
>http://www.hamuniverse.com/antennas.html
>
>There is a pointer to technical info on Cushcraft antennas. Some of the
>manuals give dimensions.
>
>Hope this helps
>73
>Glenn
>WB4UIV
>
>
>At 08:36 PM 09/17/04, you wrote:
> >Hi,
> >
> >I picked up a beam stainless steel 400-420 MHz
> >
> >How can I work out how much to cut off to bring it up to 438 MHz ?
> >
> >Cheers
> >
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