[mythtv-users] HDHomerun signal strength required

David Brodbeck gull at gull.us
Fri Feb 22 20:37:22 UTC 2008


On Feb 22, 2008, at 11:40 AM, Roger Heflin wrote:

> One thing that you can do, is test each antenna separately and note  
> what
> channels each gets and how strong it is, if both together are worse  
> than
> one single you know some canceling is going on.

Yes, and to amplify (heh heh) on what Brian said, phase-canceling is  
very frequency dependent.  If the canceled frequencies don't land on a  
channel you care about, it's not a problem.  If it does, you can shift  
the canceled frequency just by changing the distance between the two  
antennas by a few inches, or by turning them enough to put the  
affected channel in the null of one of the antennas.

All antenna work contains some measure of "cut and try" because there  
are so many real-world effects that are difficult to model.  If you  
can make it work well enough for your purposes, feel free to ignore  
any math that says it shouldn't. ;)



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