[SATLUG] OT: Built my own DTV antenna

Jim Wells jfw5cpa at gmail.com
Mon May 4 21:45:27 CDT 2009


I like this.  MAYBE I will then be able to get more channels near SAC.

Jim W5CPA

On Mon, May 4, 2009 at 2:48 PM, R P Herrold <herrold at owlriver.com> wrote:

> On Sun, 26 Apr 2009, Jeremy Mann wrote:
>
>  Luckily I had all the parts. About the only thing you'll have to buy
>> is a 75 ohm balun. Here's a pic. Its pretty ghetto but works
>> surprisingly well:
>>
>> http://mann.uthscsa.edu/images/dtv-antenna.jpg
>>
>
> looks fine to me -- a bowtie, and so directional; one active element rather
> than the two shown here:
>        http://www.practical-home-theater-guide.com/digital-tv-antenna.html
>
> "The Channel Master 4228 UHF antenna is a long-range wide-band (Channels
> 14-69), 8-way bowtie dipole design directional antenna with a maximum gain
> of 15.8dB and a beam width of 15 degrees. "
>        down the page a bit.
>
> No chicken wire backing (to eliminate to ground backside signal), and so
> not so ghetto as it could be ;)
>
> The BalUn (transition from a Balanced transmission line to an Unbalanced
> circuit) makes for ease in terminating RG-59 ish coax to halves of the
> antenna -- was there any theoretical attempt at impedence matching as well?
>
> Similarly the element arms -- were they cut to be half (quarter) waves at
> some intentional frequency center?
>
> -- Russ herrold
>        wb8sky
>
> --
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