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jrf
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Join Date: Jan 2010
Posts: 29

Relationship of "4gig" to Broadcast Signal

01/06/2010 9:18 AM

Hello,

I work constantly around a variety of antennas from small omnis and yagis to large tv and broadcast antennas, in as such over the last couple of years I have taken quite an interest in the properties, and fundamentals, and mathematics related to them. I have created a fairly decent foundation in the basics. Something has been bothering considering new technology and the 4gig. The antennas I normally work with for this area of the industry are rated for 850-1900(or 1.9gig). So obviously you are not broadcasting a 4gig signal from a peak antenna of 1900 mhz. So I thought perhaps this refers to the modulation rate of the carrier signal (800-1900mhz). Unfortunately, what I know about modulation says this would be way outside of the modulation parameters. I was reading something on radar the other day that was referring to sampling to frequency rates. So my next hypothesis is that the 4gig refers to the sampling rate of the recieved and rebroadcast signal, which in this case would be about double(1.9gig i.e 4gig) thus allowing for a clearer low now signal recreated at the recieving end. Could anyone help clarify this matter for me.

Thank you

JRF
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tdesmit
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Engineering Fields - Electrical Engineering - New Member United States - Member - New Member

Join Date: Apr 2007
Location: Wichita, Kansas USA
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#1

Re: Relationship of "4gig" to broadcast signal

01/06/2010 10:11 AM

JRF,

Are you talking about "4G" as used to describe the latest cellular/wireless technology? If so, the "G" does not stand for "Gigahertz", it stands for "Generation", as in "4th Generation Cellular Technology". Please see the Wikipedia listing for more detail;

LINK

If you are NOT talking about cell phone networks, my apologies :)

Tom
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jrf
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Join Date: Jan 2010
Posts: 29
#2
In reply to #1

Re: Relationship of "4gig" to broadcast signal

01/06/2010 11:30 AM

Thank you,

this makes me feel a bit foolish since I work around these antennas and tech regularly. I guess I was just under the impression that it also referred to some electrical relationship to the tech.
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dkwarner
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Location: Placerville, CA (38° 45N, 120° 47'W)
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#3

Re: Relationship of "4gig" to Broadcast Signal

01/07/2010 12:23 AM

Please note that 'gig' is an abbreviation for 'Giga-'. Giga- means nothing by itself. It is a prefix meaning 1,000,000,000 of something. In writing, that something should always be specified, as in GB (GigaBytes), GHz (GigaHertz), GigaFlops, etc.

In speaking in context, the surrounding words commonly define the meaning (a 300 Gig Hard Drive more or less obviously refers to 300 GigaBytes), but in writing, the unit should be there together with the prefix.

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Bill ML
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Location: Orlando
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#4

Re: Relationship of "4gig" to Broadcast Signal

01/07/2010 10:26 AM

To answer one of your questions: Antennas are not concerned with the type of modulation, only that they are designed for the applicable radio frequency band.
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Sleddriver
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Join Date: Sep 2006
Location: Colorado
Posts: 146
#5

Re: Relationship of "4gig" to Broadcast Signal

01/07/2010 7:41 PM

It might be related to the power, as in 4 Gigawatts, but that's quite a lot of power - I have never heard of any commercial application using that much power. I think tdesmit is closer with 4G, as in 4th Generation.

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