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Cool1
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Re: Digital Set Top Boxes

Sat, 08 October 2005 04:42

THE WITZL wrote on Sat, 08 October 2005 10:18

Shane - true, there is realistically no difference between an analogue and digital antenna...

... EXCEPT that most combination or VHF only antennas on the market that are intended for analogue reception are not cut to receive the frequencies of VHF channels 6, 8, 11 and 12 properly. In fact if you plot the gain vs frequency of these old massive pieces of poo you will find some pretty shocking reception holes.
Furthermore, yes in ideal reception areas your old schoool tv antenna will probably work. But if you are in an area that isnt ideal, you will need the correct equipment to receive digital tv reliably and faultlessly. So shut up shane.

Bullshit!! RF communications is where I started in electronics and its still what I practice in. Everything you have just said is complete bullshit found in a book somewhere. There is no combination TV antenna on the market that has been "cut" or tuned to the exact frequency TV channels are on, its just impossible to do due to the broad bandwidth! So broad in fact that a 4dB TV antenna will still have about 3-3.5dB gain 40MHz out of the specified bands.
The only thing a TV antenna needs is a damm good reflector to help stop reflected out of sync signals. But this isn't even required with digital channels.

Quote:

So what do i mean by a "digital antenna"?
I am refering specifically to a VHF ch 6-12 (band 3) "yagi" style antenna, that is cut with the intention of receiving channels 6, 8, 11 and 12.
By removing the need to receive channel 2, the antenna also become a shitload smaller - cos all those looooooong arse elements on your current antenna are there to receive nothing but ABC analogue TV.

This is bullshit also! The longer elements on a TV antenna are for the VHF channels. The higher the frequency you want to receive, the smaller the elements get.
I would recommend to you that you go and work in the RF communications field designing and installing antenna systems for at least 7 years before you continue to dribble crap facts.
No matter how many jaycar catalogs or any other text books you read it will give you fuck all knowledge when it comes to RF.
And don't try and tell someone that they don't know anything about the job they have been doing most of their working life!

[Updated on: Sat, 08 October 2005 04:53]

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