Author Topic: What does "channel bandwidth" actually means?  (Read 1080 times)

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Offline sangarTopic starter

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What does "channel bandwidth" actually means?
« on: August 23, 2018, 06:30:49 am »
Hello All,

This might be a basic question but some RF transceiver manufaturer interpreted it in their own way. Ok, coming to the question, I am working on AD9361 which tells it supports 200KHz to 56MHz bandwidth and have operating band of 70MHz to 6GHz.  Here 56MHz means that it support maximum of 56Mbps ?. If it is so, its frequency spectrum will come like below
                     
                    fc-28MHz ---->  fc ------------> fc+28MHz

 
If my above understaning is correct, with multiple channels located at every 100KHz, the above trasmission interfere with other channels?

Please let me know...

Thanks,
Muthu
 

Offline ataradov

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Re: What does "channel bandwidth" actually means?
« Reply #1 on: August 23, 2018, 06:50:13 am »
This is basically correct. Except for the relation MHz == Mbps. This is not generally true and depends on the modulation scheme.

And yes, you can't space 56 MHz channels 100 KHz apart, it will not work.
Alex
 

Offline bson

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Re: What does "channel bandwidth" actually means?
« Reply #2 on: August 23, 2018, 11:32:03 pm »
You don't have to use the full 200kHz bandwidth, just limit IF to 100kHz or less.  This is why it specifies "<200kHz to 56MHz".  In real usage you may want a second, even third LO and further narrow down the IF.  (These can be fully digital conversions of course.)  The 56MHz value is of more interest here since this is the max bandwidth you can monitor in real time.
« Last Edit: August 23, 2018, 11:34:04 pm by bson »
 


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