[SATLUG] OT: Built my own DTV antenna

R P Herrold herrold at owlriver.com
Mon May 4 14:48:27 CDT 2009

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:

"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

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