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Hi all
How difficult is it in different countries (e.g. Europe) for a company to find employees? - Normally we only talk from the side of the worker, but in my eyes a big problem exist also for the companies itself.
Look at our case: We are a small company (4 people) in Switzerland doing Hard-...
Hi Abhishekabs
When you are mixing a signal directly froma a patch-antenna I suggest that you need low conversion-loss in your mixer. Dynamic range and harmonic distortion would be in a second place, right?
What also has a high effect in LO power is the diode type (low-barrier, medium barrier...
Hi all
I designed a CPU board with an AMCC 405EP controller. The whole board works well with a Linux and QT.
By EMC testing we saw a strange behaviour of the board: The 266MHz CPU clock has a strong jitter on it, but the 66MHz input clock has not.
Let me explain the design a little bit more...
Hi techie
As far as I know (sorry, some years ago) an SMS is not sent over the data channel of the GSM link. There is also a signaling channel, which has not the same error detection algorithms. We had an error rate (byte errors) of about 10-6. So if the CRC of one block was wrong (happened...
Hi techie
Some years ago we had a similar problem. We had to update the software of stand-alone systems by SMS. We have done it in the following way:
- The first SMS contains the amount of data to be sent and the CRC of the full file (we also had additional infos that filled up this SMS, but...
Hi abdoeng
I simulated the design you posted. There occured no problem, I attached you the simulated timedomain and S11.
I guess that the problem you have is one of the following:
- You have a license-file with enabled multiprocessor-support, but your machine only has 1 CPU. In this case CST...
Hi labille
A gunnplexer is a transmit/receive device in the GHz range. The transmit-frequency is created by a Gunn-Diode which is mounted in a cavity. The Gunn-Diode creates a negative resistance and the cavity is the resonance element and gives the oscillator (=transmitter) frequency. This...
Hi Breixo
What you need is a CW doppler radar which is capable of doing FMCW. If you also want to detect the angle of the object you also need several antennas (phase shifted). A module which cover all of them is not known to me (especially with DSP-card or CAN-bus included).
Most modules I...
Hi thiagoyk
For which frequency you will use the radome? - For higher microwave bands (10GHz and higher) it is necessary to adapt the radome to the frequency. The easiest way is to make the microwave power travelling in a 90 degree angle through the radome and make it lambda/2 thick (lambda...
Hi mikal
If you do not have the ideal 'line of sight' with no reflections, you can never guarantee that your link will not be interrupted. The most problems are caused by reflections. You could be at a very short distance (for example 10m, transmitter in line of sight) but the receiver also...
Re: detecting multipath
Hello biff44
You need to send a known signal at point A. The repetition rate of this signal has to be larger than the greatest multipath reception that you except at point B. This signal could be a sine wave or (better) a PN-sequence.
At point B you have a correlator...
Hi all
I designed a Transceiver-Antenna at 24GHz using CST Microwave studio. The system contains a 1*4 Patch array as transmitter and a 1*4 Patch array as receiver. Both antennas have their own port.
When I do the simulation I get all S-Parameters and the Farfield of the receiver or the...
Hello IanP
OK, this was also my approach to connect several caps in parallel. I have calculated that I use a ripple current of about 40-50A. So I have to parallel at least 10 capacitors. This is a problem of space.
In my opinion the max. allowed ripple-current is given because of the maximal...
Hi all
I have to design a Power-Supply which can deliver a current of 150A for a time of 150us into a laserdiode (voltage =2V). This pulse is given every 1000us.
The design of the Supply itself is not the problem (multi-phase PWM design), but I have to store the energy of 1 pulse (150A @...
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