forums on communication technologies

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#1
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Hello,

I'm looking for forums in which communication technologies are discussed intensively. Can anyone recommend some?

Thanks
Senmeis

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Which communication technologies? I imagine Ethernet+TCP/IP probably has far more discussion than just about anything else.

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Sorry, I mean wireless communications such as satellite communications.

Senmeis

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Well that narrows down the scope a little!

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satellite communications (one of many forms of wireless).

tried Google?

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Quote:

I mean wireless communications such as satellite communications.

Still too vague. Are you talking about things like QAM/QPSK ? Or satellite telephony? Or what?

BTW to find a forum about anything on the internet type "subject forum post". For example the top hit for "AVR forum post" is this message board. For "Bengal Cats forum post" it is www.bengalcatforums.com (undoubtedly one of best fora about Bengals on the internet!).

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Yes, it is about modulation and RF.

Owen

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learn about Radio Frequency carrier signals. Then the many ways that analog and digital information can be imposed on a carrier for transmission at various frequencies. Relate it to real life by understanding how radio broadcast in AM differs from FM.
That done, you've got about 0.001% of wireless.

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Part of the problem is that many of the commercial systems are proprietary. They will NOT tell you what they use because they don't want unauthorized folks trying. So, they just do not say.

Jim

Jim Wagner Oregon Research Electronics, Consulting Div. Tangent, OR, USA http://www.orelectronics.net

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Software-defined radio covers most if not all modulations and protocols. Add that or SDR as a search term for useful info on a modulation, and plug a cheap hardware dongle into your computer sound card to get some hands-on experience.

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ka7ehk wrote:
Part of the problem is that many of the commercial systems are proprietary. They will NOT tell you what they use because they don't want unauthorized folks trying. So, they just do not say.

Jim

Very few, in my experience. All wireless uses the same principles. AM, FM, phase coded, amplitude/phase encoded (QAM), Single carrier, OFDM, half-duplex, full-duplex, SISO, MIMO, forward error correction codes, time division duplexing, and so on.

Many ingredients, many recipes. Cellular, Public Safety, broadcast, most microwave point to point, IEEE 802.11, 802.15.4, 802.15.3 (bluetooth), most all of the important wireless is well documented. Even the rolling-code garage door openers.