Help with some communications.

Pandam00nium · 09-27-09, 06:03 PM

I'm trying to work on an assignment for my communications class, and well.. I'm quite confused since I'm taking my analog devices class along with this. So I'm not all that familiar with everything my professor talks about.

Anyways my question is in regards to bandwidth and sidebands. The first question was about a 1-MHz AM carrier with modulated voice frequencies with a range of 100Hz to 3kHz.

Now I got the answer to the first part which was about the frequency-domain spectrum(1-MHz being the carrier, and the lower sideband being .997MHz-.999MHz, and the upper sideband being 1.0001MHz-1.003MHz [feel free to correct me if I'm wrong])

The second part of the question is just asking what the bandwidth of the modulated signal would be.

From my notes I wrote down that bandwidth is the highest modulated frequency. So would the total for a double sideband be 6KHz since they're 3KHz each?

Um.. Thanks for reading. Also I apologize if I posted in the wrong section. It's kinda hard to tell where to discuss electronics in general..I figured the sub-forum circuitry section would have fit. >.>;

petteyg359 · 09-27-09, 06:32 PM

Might want to correct your units there. You meant 997KHz (.997MHz) to 999KHz (.999MHz), right?

Pandam00nium · 09-27-09, 06:35 PM

Quote:

Originally Posted by petteyg359

Might want to correct your units there. You meant 997KHz (.997MHz) to 999KHz (.999MHz), right?

aww crap you're right. haha. thank ya. Was suppose to be 1MHz as well rather than 10MHz. x.x

09-27-09, 06:03 PM	Thread Starter #1
Pandam00nium Member Join Date: Feb 2007 Location: Up in the mountains~	Help with some communications. I'm trying to work on an assignment for my communications class, and well.. I'm quite confused since I'm taking my analog devices class along with this. So I'm not all that familiar with everything my professor talks about. Anyways my question is in regards to bandwidth and sidebands. The first question was about a 1-MHz AM carrier with modulated voice frequencies with a range of 100Hz to 3kHz. Now I got the answer to the first part which was about the frequency-domain spectrum(1-MHz being the carrier, and the lower sideband being .997MHz-.999MHz, and the upper sideband being 1.0001MHz-1.003MHz [feel free to correct me if I'm wrong]) The second part of the question is just asking what the bandwidth of the modulated signal would be. From my notes I wrote down that bandwidth is the highest modulated frequency. So would the total for a double sideband be 6KHz since they're 3KHz each? Um.. Thanks for reading. Also I apologize if I posted in the wrong section. It's kinda hard to tell where to discuss electronics in general..I figured the sub-forum circuitry section would have fit. >.>; __________________ Case: CoolerMaster HAF 912 CPU: AMD Phenom II 1090T @ 3.81GHz Mobo: MSI 880G-E45 RAM: G.SKILL Ripjaws X Series 16GB GPU: MSI 6950 1GB TwinFrozr III SSD: OCZ Vertex Plus R2 120GB // HDD: Samsung F3 1TB PSU: Corsair VX550 Heatware ¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯ Last edited by Pandam00nium; 09-27-09 at 06:37 PM. Reason: darn typos.
	QUOTE Thanks

09-27-09, 06:32 PM	#2
petteyg359 Join Date: Jul 2004 Location: University of Southern Mississippi	Might want to correct your units there. You meant 997KHz (.997MHz) to 999KHz (.999MHz), right? __________________ MSI 890GXM-G65 - FX 8350 - 16GiB 12800 - 7950 3GiB - 8 Pro x64 / Gentoo amd64 - AX760 Dell XPS 15 L502x - i7 2760QM - 16GiB 12800 - GT 540M 2GiB - 7 Pro x64 / Gentoo amd64 - Agility 4 512GB [GB ≠ GiB] [MB ≠ MiB] [kB ≠ kiB] [1000 ≠ 1024] [Giga ≠ gram] [Mega ≠ milli] [Kelvin ≠ kilo] [Byte ≠ bit] "Apparently, Plaintiff believes that he could sue an egg company for fraud for labeling a carton of 12 eggs a “dozen,” because some bakers would view a “dozen” as including 13 items." - Western Digital 2006
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