Difference between revisions of "Talk:Installing a TV aerial"
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- Better aerials have a small balun inside that transforms the 300 ohm signal to a genuine 75 ohm feed. All CAI approved aerials have this. | - Better aerials have a small balun inside that transforms the 300 ohm signal to a genuine 75 ohm feed. All CAI approved aerials have this. | ||
[[User:NT|NT]] 23:55, 4 March 2009 (GMT) | [[User:NT|NT]] 23:55, 4 March 2009 (GMT) | ||
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| + | It did not really seem that relevant since the article already strongly suggests CAI aerials (which will all have a balun when required (i.e. allowing for CAI approved Log periodic aerials which are naturally balanced and have a 75 ohm impedance)). It was also somewhat inaccurate as currently described (see Bill's comments about the effects of parasitic elements on characteristic impedance). | ||
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| + | Perhaps a simpler statement would be in order? | ||
| + | --[[User:John Rumm|John Rumm]] 00:24, 5 March 2009 (GMT) | ||
Revision as of 00:24, 5 March 2009
Baluns
why would one delete this:
Baluns
- Nearly all TV aerials are described by the manufacturer as 75 ohm aerials, yet nearly all are really designed as 300 ohm aerials, with construction details reducing this to some degree, but not to 75 ohm. Connecting a 300 ohm aerial to 75? cable causes loss of gain, tendency to reflections, and some degree of degradation of signal quality. - - Better aerials have a small balun inside that transforms the 300 ohm signal to a genuine 75 ohm feed. All CAI approved aerials have this. NT 23:55, 4 March 2009 (GMT)
It did not really seem that relevant since the article already strongly suggests CAI aerials (which will all have a balun when required (i.e. allowing for CAI approved Log periodic aerials which are naturally balanced and have a 75 ohm impedance)). It was also somewhat inaccurate as currently described (see Bill's comments about the effects of parasitic elements on characteristic impedance).
Perhaps a simpler statement would be in order? --John Rumm 00:24, 5 March 2009 (GMT)