[XCSSA] OT: Built my own DTV antenna

[X-otic Computer Systems of San Antonio]

J Man,

You got any links for the DIY antenna? I find the signal of OTA seems  
to have the best quality, even over Cable, and is tried and true. My  
Switched Digital adapter for my Tivo tends to go out and, when it  
does, I can't record anything (switched or otherwise). So, if I can  
convince the Tivo to use OTA for the networks I can at least record  
those.

Tweeks, nice research! The "Mathematics associated with the rusty  
bolt" gave me a good chuckle :)

Tim S.


On Apr 27, 2009, at 10:03 AM, X-otic Computer Systems of San Antonio  
wrote:

> On Sunday 26 April 2009, X-otic Computer Systems of San Antonio wrote:
> [...]
>> Can somebody explain in laymans terms "extraneous harmonics"? I'm  
>> just
>> curious because I'm NOT using an amplified antenna so I shouldn't be
>> affected by this problem.
>
> If the transmitter is either overmodulating, or there is a chunk of  
> metal near
> the transmitter (or near your receiver) that has nonlinear RF  
> properties
> (such as a rusty bolt), this can create a type of "junction".. then  
> extra
> harmonics  far outside the regular surrounding harmonics (1,3,5,  
> etc) can be
> created far outside the carrier range.
>
> Ha! I actually found a link on this phenomena:
> 	http://en.wikipedia.org/wiki/Rusty_bolt_effect
>
> I specifically love the "Mathematics associated with the rusty bolt"  
> seciton:
> 	E = Eo K1 + (Eo)2 K2 + (Eo)3 K3 + (Eo)4 K4 ..... etc
> 	For an ideal perfect linear object K2, K3, K4, K5 etc are all zero.
> 	For a 'rusty bolt' or a frequency mixer stage K2, K3, K4 and/or K5
> 	etc are not zero.
>
> Gotta love wikipedia... ;)
>
> Fix?  A can a connector lubricant from Rat Shack and re-tightening  
> all of your
> connections.
>
> An alternate explanation of your problem COULD be that both of your  
> bands are
> being interrupted by a localized, wide spectrum disturbance.  How  
> long does
> the drop out last?
>
> Tweeks
>
>
>
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