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Join Date: May 2006
Posts: 44

Signal Baud rate calculation - ASK Modulation

03/25/2008 3:05 AM

Hi folks..

I have searched through Google and its suggested links before coming over and asking you.

I am not a communications engineer. But have tried to learn as much as I could for the project I am currently handling. We have gone along with a reference design circuit for the ASK modulation RF Transmitter and receiver. The data Sheet says that the maximum baud rate possible is 80 Kbps but that the design is optimised for 4800 bps. the application note as well mentions the baud rate as 4800. I used a baud rate calculation formula from the net but it did not match the results. Please help me out guys..

The carrier wave frequency used is 433Mhz. The controllers are capable of processing data in the realm of 1Mhz. It seems the limitation comes from the saw tooth filter used.

  • How is the baud rate calculated... And how can it be increased.

More over will the design limitation also be in the transmitter section...

I know the details are insufficient but I do not want you guys to solve the answers for me but to possibly show me the right direction/path to follow to solve the issue.

Please let me know if any further details are required for you to help me out...

regards,

Vishal....

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Pathfinder Tags: ASK modulation Baud rate baudrate Receiver RF transmitter
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#1

Re: Signal Baud rate calculation - ASK Modulation

03/25/2008 3:48 AM

Hi folks. I seem to have miss-interpreted the problem... The Baud rate is not a problem at present... Well I use 3 bits to represent one symbol or baud..... So with baud rate being 4800. I shouldn't be facing a problem in transmission or reception. But does my Saw tooth filter affect the bit rate... and given that i want to increase my bit-rate by 4, other than s/w modifications do I need to worry about the filters used. And is it only with the receiver or also the transmitter...

The problem is that once I double the bit rate through software control the data reception rate and the transmission distance reduce drastically. How can I prevent this...

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#2
In reply to #1

Re: Signal Baud rate calculation - ASK Modulation

03/26/2008 12:36 AM

If you change the baud rate does the frequency increase?

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#4
In reply to #2

Re: Signal Baud rate calculation - ASK Modulation

03/28/2008 6:39 AM

By frequency if you mean the bit rate yes they both increase but the carrier frequency is the same..., actually a constant...

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#3

Re: Signal Baud rate calculation - ASK Modulation

03/26/2008 8:41 AM

I would recommend that you buy "off the shelf" chips to do this, as you may be suffering from some data speed problems that they will handle better I feel.

Why try to do something that is already "fixed" so to say by professionals....

Also you forgot to mention the distances involved which of course have a dramatic effect on speed too.....

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