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HOW RF MODULE WORKS?

HOW IS THE SIGNAL FLOW AND GET MODULATED AND DEMODULATED IN IT.

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  • arunavenue Apr 04, 2009

    basic working of encoder used in rf module in transmitter??

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Sir ... i have to construct a model bridge in which i have to give a mechanism for the passing bridge.the problem is arrival of the ship should be detected by mechanism employed on bridge and ship should have a way to cross through. plz give detail mechanism of the signalling system which should be used on the bridge which detect the coming of the ship

Posted on Aug 30, 2009

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Connectivity dropping and weak signals on all devices


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I understand that your router's signal is weak and other connections drop because of that.
To resolve this issue, I would suggest you to change the wireless channel to 1(one). Because, the frequency on Channel 1 will not interfere with other RF frequencies.

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Transceiver signal interference


The FT-840 uses a die-cast RF power amp with thermally switched fan to ensure full power output (up to 100 watts). The digitally synthesized local signals ensure clean, low-noise transmitter output on all HF amateur band. There might be no AC line interference. it has strong Rf output. any AC line intersect does not affect its radio performance. Check and adjust RF power so to maintain proper output. some times more RF power generated at the output may cause interference. adjust Rf power..Even some unfiltered Noise getting the other end of the end may calso cause interference. Check for any Ripple voltages present at the output. Contact authorised service station for further Rectification. thank you shanth

Dec 23, 2007 | Computers & Internet

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Tm751


Is it an appliance module x10 otherwise it's not strong enough

Dec 05, 2007 | X-10 (RTM75) Transceiver

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Suggest long range RF module (for several kilometers) please. xbee, maxstream dont suffice


Not to grouch, but you should be more specific as I'm not sure of your specific needs.

In any case, here... take your pick.

http://www.digi.com/technology/wireless/products.jsp

All of these will out do the MaxStream for range. BPS is a different story.

If range were all you wanted, then I would go with the third from the bottom. If you need the bandwidth then the bottom is the best.

Of course I have no idea if your looking at this from a hobbyist’s point of view or from an industrial/mass production one because you did not specify. I assume you are a hobbyist and you want to buy just one unit and your not afraid to do some "adjustments" to whatever it is you decide get. If so, almost all of those units will happily modify to interface with TTL level logic and/or run off batteries.

-Charlie

Feb 25, 2009 | Digi Computers & Internet

1 Answer

Working principle of super heterodying receiver


you can find it easy with google, but here is how it works...the incomeing rf signal is mixed with a signal of another frequency from the local oscillator and then passes through a non linear device (semiconductor). after passing through the nonlinear device the output will contain the original frequency,the local oscillator frequency, and frequencies equal to those added together and subtracted from each other,these signals are then passed through filters to obtain only one which will be either the rf frequency plus the local oscillator frequency or the rf frequency minus the local oscillator frequency. This new frequency is then coupled to the intermediate frequency amplifier stages where most of the amplification takes place before the audio is removed and passed to the audio stages.

Jan 13, 2009 | Computers & Internet

1 Answer

AC line interference


I experienced very similar or the same problem with FT-840. When power is inceased over about 50 W, an AM on RF signal arises. Even when TCVR is supplied from accu and connected to dummy load. Period of interferencing signal is about 7.5 ms (130 Hz), so it cannot be hum from mains. I have not opened the PA block yet but i guess, it could be caused by damaged capacitor(s). Jiri

Dec 23, 2007 | Computers & Internet

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