So now I have 1mm copper wire, I will try to make L1 (From this site: **broken link removed** I calculated, that I need coil diameter - 8mm, length - 5mm and turns - 3), also I have 3-10p trimmer so I will try to tune it on desired frequency.
Next question is how to measure L1 inductance? I used L1 like this:
**broken link removed**
2. Can I use it? Or I need to make it from copper?
Also I noticed, that 17cm antenna is too big, and decided to make transmitter/receiver with 868MHz or 2.4GHz.
3. Maybe someone have some circuits for 868MHz or 2.4GHz transmitter/receiver? Can I make it the same I did for 434MHz just changing some components?
Yes I know there are a lot of 2,4GHz modules, but they all are for sychronous systems, but my input signal is from Time encoding Machince (TEM) which is asynchronous, so building transmitter/receiver is difficult.
Thanks for help.
Best regards,
Kaspars
How about coding the 10 data channels into one? What's the data rate of each channel?
If the asynchronus data follow comply to a known protocol, e.g. UART with a specified baud rate, they can be encoded to a single data steram with higher data rate. Although the effort is higher than for a simple synchronous data, I think it's still preferable to having 10 transmitters or at least 10 subcarriers.
I expected in fact UART like asyncronous data streams, that are basically sampled at discrete times. The "very high accuracy" point will probably contradict the limited bandwidth of the transmitter channel. You should give a rough idea of expected timing accuracy. A single edge can be transmitted over a band limited channel with good accuracy (if noise isn't too severe), but if you have two consecutive edges, the limited bandwidth will cause interpendence of both events.If I use UART at the receiving part there is still clock (CLK) and in my application there aren't bits, there is only time moments when binary output change edge from 0 to 1 and from 1 to 0. I need very high accuracy, so I can't use any clk.
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