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Thank you for your answer senilicus. Could yu please share what is the distance between some connector footprint and its (second, zero height) courtyard in your library? And why do you use this value?
My problem is I was not able to find any such information inside the IPC-7351. They are only...
Hi all guys,
I want to make footprints for audio 3.5mm stereo connector (SMT) and for USB A connector to meet IPC 7351 standard. However, after reading the standard I was not able to find how to set the courtyard for such components.
Additionally, I was able to find an explanation inside the...
HI all guys,
I had a problem to name this thread, cause it is rather broader topic. So, I have designed a board with ARM LPC1768 and 434 MHz transciever CC1000 from TI. What I want to do now is to make proper firmware structure.
As for the requirements, the receiver must be able to receive...
Hi all guys,
I have designed a receiver for FSK reception in 434 MHz ISM band. For this I used USRP1 and GnuRadio. Now, I would like to measure performances of my receiver. For this purposes I did following:
I transmit over cable using signal generator a bunch of 10000 frames with pseudorandom...
Hi all again,
I finally made this work. It oscillates and it's fine. However I would like to know how circuit exatcly works, especially why it oscillates at the frequency 1/(2*pi*sqrt(LC)). Where does the phase shift in the feedback loop come from?
Thanx
Hi,
yes, I speak concretely about CD4007, 2 complementary pairs and one inverter in the same chip. It might be misuse, but since it has negative transcoductance in the transition region, it should be nice for oscilators. This should be only for testing purposes so it should have been fast...
Hi,
@Audioguru: I actually want sine wave, so I will ommit the second inverter in the circuit i provided. That can be the clue, but i don't understand that completely. I saw people giving answers like with X transconductance with that capacitance it will work. That is something similar to your...
Hi,
I added 10k trimmer potentiometer between output and feedback loop. With higher values, above 5k I would say the oscillations diminish. However, there should be output resistance of the inverter which allows phaseshift?
As for transformer coil used as an inductor, I must say that I already...
Hi all guys,
I am trying to make an oscillator using CMOS inverter for quite some time and it won't oscillate at desired frequency.
I want to make 125 KHz oscillator using following schematic (the element values are not relevant for desired frequency):
The circuit simply won't oscilate for...
Hi all,
I wonder about possible impedance mismatch in commercial cheap 3 way splitters used in CATV systems. If 2 out of 3 ports are connected can that make a problem and should all output ports be terminated with adequate impdance?
Thanx
Hello,
I have been wondering for a few years why Friis equation actually works.
Its Pr = Pt + Gt + Gr - PropLoss, and Pr will be in ideal case the power available at the output port of receiving antenna.
How is that possible when Pt is not 100% percent concentrated in direction of transmitting...
Hi all gus,
I am dealing with radiation pattern of TPMS sensor. Unfortunatelly I am not able to visualize it in 3D and to realize consequences. On the diagram one can find both measured and simulated radiation patterns for standalone sensor, sensor attached to the wheel only and sensor attached...
Hello,
@tony_lth: thanx for your answer.
Indeed, that's what I actually did. Now I wonder how to get BER vs SNR for realistic demodulator. At the moment I use BER = 1/2*e^(eb/(2No)). This is what I have found in a book for non-coherent binary FSK demodulation.
Thanx
Hi all guys,
I am currently working on a simple radio communication simulator. The main idea is to calculate PER based on BER based on SNIR. At the moment I don't really like to be able to receive a lot of frame with power of arround -120 dBm (@434MHz) which sounds kind of unrealistic to me...
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