Hi Group,

I looking at convering a TV UHF antenna to 2.4 GHz, the antenna has a
yagi part with elements spaced every 3 inches and the elements are the
same lenght of about 3 inches.

I think the 3 inch element lenght are a little long, and the elements
need to be cut so that one of them is the reflector and one as a driven
elements and the others would be come directors. There are about 10
elements on this boom.

The element spacing, 3 inches most likely will do OK ? comments?

A look in the handbook for 2.4 GHz antenna, either they don't include
them or I missed them. I have several old handbooks and ARRL antenna
books.

So, would as anyone who has some of the basic dimensions to pass that
along.

Also concerned that the frequency will require a SMA or Type-N and
matching, I don't have a means to check the SWR.

De KJ4UO

On 20 May 2006 21:49:24 -0700, "
wrote:

I looking at convering a TV UHF antenna to 2.4 GHz

Hi OM,

Sounds like a fool's mission.

73's
Richard Clark, KB7QHC

I'd suggest it isnt worth attempting. The frequency change is more than
3:1 from the original TV use.

There are a lot of simple 2.4GHz designs out there that are worth
looking at.

Cheers Bob VK2YQA

wrote:

Hi Group,

I looking at convering a TV UHF antenna to 2.4 GHz, the antenna has a
yagi part with elements spaced every 3 inches and the elements are the
same lenght of about 3 inches.

wrote in message
oups.com...
Hi Group,

I looking at convering a TV UHF antenna to 2.4 GHz, the antenna has a
yagi part with elements spaced every 3 inches and the elements are the
same lenght of about 3 inches.

I think the 3 inch element lenght are a little long, and the elements
need to be cut so that one of them is the reflector and one as a driven
elements and the others would be come directors. There are about 10
elements on this boom.

The element spacing, 3 inches most likely will do OK ? comments?

A look in the handbook for 2.4 GHz antenna, either they don't include
them or I missed them. I have several old handbooks and ARRL antenna
books.

So, would as anyone who has some of the basic dimensions to pass that
along.

Also concerned that the frequency will require a SMA or Type-N and
matching, I don't have a means to check the SWR.

De KJ4UO

Hi KJ4UO

I assume that you dont have alot of experience with designing and building
Yagi antennas. If you have no test equipment for testing at 2.4 GHz, you
will undoubtedly be at the mercy of luck, good or bad.
If your goal is to have a WiFi yagi, there are affordable Yagi antennas
available for less than $100.00.
If your goal is to build your own WiFi antenna, I'd suggest you consider
using other than a Yagi. You have probably searched the web and know about
the cantenna. And, a small satellite TV dish is easy to convert to 2.4
GHz.

Jerry

Hi Jim

I got all my feed point info from Trevor Marshall's web site.
http://www.trevormarshall.com/biquad.htm

Jerry



"RST Engineering" wrote in message
.. .
Is there a URL where this is discussed?

Jim


And, a small satellite TV dish is easy to convert to 2.4
GHz.

Jerry

wrote in message
oups.com...
Hi Group,

I looking at convering a TV UHF antenna to 2.4 GHz, the antenna has a
yagi part with elements spaced every 3 inches and the elements are the
same lenght of about 3 inches.

I think the 3 inch element lenght are a little long, and the elements
need to be cut so that one of them is the reflector and one as a driven
elements and the others would be come directors. There are about 10
elements on this boom.

The element spacing, 3 inches most likely will do OK ? comments?

A look in the handbook for 2.4 GHz antenna, either they don't include
them or I missed them. I have several old handbooks and ARRL antenna
books.

So, would as anyone who has some of the basic dimensions to pass that
along.

Also concerned that the frequency will require a SMA or Type-N and
matching, I don't have a means to check the SWR.

De KJ4UO

We had need for an antenna like that a few years ago, and bought a loop Yagi
from www.downeastmicrowave.com . No doubt similiar antennas are available in
DJ land. The one I bought had something like 80 elements on about a 3 - 4
meter boom. Price was ~U$120. Converting a TV antenna does not seem
worthwhile.

Tam/WB2TT

Bob Bob writes:

I'd suggest it isnt worth attempting. The frequency change is more
than 3:1 from the original TV use.

There are a lot of simple 2.4GHz designs out there that are worth
looking at.

Here are some cool ones build using Chinese cookware and USB Wi-Fi
adapters:
http://www.usbwifi.orcon.net.nz/
E.g. this one:
http://www.usbwifi.orcon.net.nz/usbscoop.jpg

73
LA4RT Jon