electronic forums
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Hi, have a question about eletronic (rf) circuits, does anyone know of such forums for us technical orientated dudes?
Brakanjan wrote: does anyone know of such forums I haven't run across any yet, but you might try posting the question here. After all, it's not a programming question, and you never know what expertise you'll find in this community.
"Nobody is Ugly at 2AM"
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Hi, have a question about eletronic (rf) circuits, does anyone know of such forums for us technical orientated dudes?
Go ahead and post the question....Myself, I had to run through the standard battery of electrical engineering courses, and although I am extremely rusty, I might have some answers for ya...and if I don't chances are someone here will. Jeremy Kimball
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Brakanjan wrote: does anyone know of such forums I haven't run across any yet, but you might try posting the question here. After all, it's not a programming question, and you never know what expertise you'll find in this community.
"Nobody is Ugly at 2AM"
Roger Wright wrote: might try posting the question here ok here it is: I'm sending data with a transmitter at 433.92MHz, at a speed of 100kbps. my problem is that i have trouble receiving the data. On the ossiloscope you can clearly see that data is being sent, but how can I accept the data (i have a rs232 unit, so with "super terminal" or "yate" I can see what is being sent and received.) at the moment i'm sending a file with command: type "file.txt" > com1 ????????????
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Roger Wright wrote: might try posting the question here ok here it is: I'm sending data with a transmitter at 433.92MHz, at a speed of 100kbps. my problem is that i have trouble receiving the data. On the ossiloscope you can clearly see that data is being sent, but how can I accept the data (i have a rs232 unit, so with "super terminal" or "yate" I can see what is being sent and received.) at the moment i'm sending a file with command: type "file.txt" > com1 ????????????
What type of modulation are you using? What type of receiver circuit are you attempting to use? CW, FSK, and PCM are all common methods that are relatively easy to detect, and the UART at the receiving end is responsible for matching up the framing and timing. Describe the setup in a bit more detail...
"Nobody is Ugly at 2AM"
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What type of modulation are you using? What type of receiver circuit are you attempting to use? CW, FSK, and PCM are all common methods that are relatively easy to detect, and the UART at the receiving end is responsible for matching up the framing and timing. Describe the setup in a bit more detail...
"Nobody is Ugly at 2AM"
it's 2 XTR434 tranciever sets datasheet], very easy to use...(yeah right). i'm using the carier detect pin to see if the signal is picked up, and with yate or superterminal I'm trying to view the incoming data. i think the dataspeed might be too fast for my RS232 link, although I can set the baudrate to 115200bps.
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it's 2 XTR434 tranciever sets datasheet], very easy to use...(yeah right). i'm using the carier detect pin to see if the signal is picked up, and with yate or superterminal I'm trying to view the incoming data. i think the dataspeed might be too fast for my RS232 link, although I can set the baudrate to 115200bps.
That's a sweet device! I think I'll have to get a pair to play with. Two things I see are possibly preventing proper operation. First, the synchronization of the receiver clock requires a 2 mS preamble - a pattern of alternating 1s and 0s. If you just start sending, the device will not be able to lock onto the incoming date correctly. Secondly, the 115200 bps rate exceeds the maximum data rate for the device. That will not only cause it to fail, it also can drive the transmitter to emit radiation outside of it's operating band which may violate laws in your area. Try using a data rate of 64Kbps instead, and modify your baseband circuit to include the preamble before beginning data transmission. Since at 64Kbps a 2 mS time is equivalent to 16 bytes, you might get away with sending 16 x 0xAA as a leader before starting the data packets. If that works, it saves you the trouble of implementing the preamble in hardware.
"Nobody is Ugly at 2AM"
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That's a sweet device! I think I'll have to get a pair to play with. Two things I see are possibly preventing proper operation. First, the synchronization of the receiver clock requires a 2 mS preamble - a pattern of alternating 1s and 0s. If you just start sending, the device will not be able to lock onto the incoming date correctly. Secondly, the 115200 bps rate exceeds the maximum data rate for the device. That will not only cause it to fail, it also can drive the transmitter to emit radiation outside of it's operating band which may violate laws in your area. Try using a data rate of 64Kbps instead, and modify your baseband circuit to include the preamble before beginning data transmission. Since at 64Kbps a 2 mS time is equivalent to 16 bytes, you might get away with sending 16 x 0xAA as a leader before starting the data packets. If that works, it saves you the trouble of implementing the preamble in hardware.
"Nobody is Ugly at 2AM"