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Electronics => Electronics => Topic started by: airman00 on November 30, 2008, 12:43:22 PM

Title: What is Linear Output from an RF Receiver?
Post by: airman00 on November 30, 2008, 12:43:22 PM
I have the Sparkfun RF module ( http://www.sparkfun.com/commerce/product_info.php?products_id=8947 ) and have been using the Data Output for getting the UART and its been working perfectly.
What is the other data pin, the one thats labeled Linear Output?
Does Linear Output mean that the farther you get from the transmitter ,the lower the voltage from the linear output pin is going to be?

(http://i273.photobucket.com/albums/jj202/erobot/Misc%20Documentation/Picture5-1.png)

Thanks
Title: Re: What is Linear Output from an RF Receiver?
Post by: CuriousInventor.com on November 30, 2008, 05:00:24 PM
the manufacturer's datasheet (http://www.sparkfun.com/datasheets/Wireless/General/MO-RX3400.pdf) labels it as data out, too...
Title: Re: What is Linear Output from an RF Receiver?
Post by: airman00 on November 30, 2008, 05:20:08 PM
Quote from: CuriousInventor.com on November 30, 2008, 05:00:24 PM
the manufacturer's datasheet (http://www.sparkfun.com/datasheets/Wireless/General/MO-RX3400.pdf) labels it as data out, too...

I took the diagram from Sparkfun's RF tutorial that is on this page http://www.sparkfun.com/commerce/product_info.php?products_id=8950
Link to tutorial : http://www.sparkfun.com/datasheets/RF/KLP_Walkthrough.pdf

In any case what would Linear Output mean?
Title: Re: What is Linear Output from an RF Receiver?
Post by: calasus on December 01, 2008, 07:46:17 AM
Linear output is just an ANALOG OUTPUT. you can put an analog signal in TX and get the analog output on the RX side. Also you can put a radio signal in the TX and get the same radio signal on the RX side.
Title: Re: What is Linear Output from an RF Receiver?
Post by: airman00 on December 01, 2008, 01:06:44 PM
Quote from: calasus on December 01, 2008, 07:46:17 AM
Linear output is just an ANALOG OUTPUT. you can put an analog signal in TX and get the analog output on the RX side. Also you can put a radio signal in the TX and get the same radio signal on the RX side.

On the transmitter side there is only one pin for data in - so you're saying the Rx can output Analog on one pin and UART on the other - it has the ability to auto separate the two data types?