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Re: Transmitter Antenna
I have made a short calculation.
If you want to get 1 km with building obstacles like you said, you should increase your system gain for approx 27 dB (exact number largely depends on the number of buildings and can vary even ±10 dB). For example, than you can reach the...
Thank you very much on your response, however, I have following concerns regarding RF current transformers:
1. Size of the core and linearity response
2. Dynamic range, since primary current is 0.1-100 A.
3. Secondary winding must have large number of turns and than parasitic effects will be...
I would like to measure delivered power in a system with impedances that are signicificantly different from 50Ω (dominantly capacitive impedance with small real part) and with time variable load impedance. I think that the most accurate way is to measure Voltage and Current wave effextive values...
Why you just do not print screen from the CST on the clipboard with <CTRL>+<Alt Gr>+<Print Scr> and than cut the part you want in MS Paint and paste it in Word?
<Print Scr> is just beside the function tasters on almost all PC keyboards.
1. you should specify required stability when you order your crystal from the supplier. ± 10 ppm can be achieved without compensation and resonator frequency is not a major factor here.
2. 34.375 MHz resonator is no problem for manufacturing, but if it is not produced in high quantities the...
Stability of the output frequency is the same as the stbaility of the reference oscillator. You can find reasonably priced 30 MHz TCxO (prescaler 64) with stability better of 2 ppm. With such loop you can get enough phase noise performance for any communication application. If you target radar...
At self-resonant frequency of the inductor the parasitic capacitance annulate the inductance and equivalent reactive part of the component impedance is 0. That means that the component has just parasitic resistance on this frequency and, therefore, no reactive energy is stored in the component...
gbppr.org
" it is possible to jam only GSM Signals and not CDMA.. coz CDMA can never be jammed ... "
Unforunatelly not true. Any communication system can be jammed. To do it with CDMA you need approx 20 dB more power as for GSM for the same distance, but if you want to do it in your room...
jtos 3000 vco
Commercially available crystal resonators on 550 MHz you can not find but you can try one of following solutions. First is what I would do:
0. You can use one of hundreds PLL ICs available in that frequence range and follow the application note. Use a VCO like JTOS 3000 from...
costas loop 8psk
Good initial coverage of MPSK carrier extraction is given within "Digital Communications" by Proakis. There is given a description of generalized Costas loop, too. If you want just to experiment, you can also try to use a QPSK Costas loop, but first you should square the input...
I do not better (cheeper) way to get the enough time information as DCF77. If you want to have 1 sec deviation in 10 months over range of temperatures you need accuracy of 0.04ppm. Prices of oscillators with such accuracy are in range of kE or k$, whatever your favorite currency is, since they...
-174 noise power
Yes, it was my assumption in my 1st post, and this consideration about thermal equilibrium can be found also in Pozar book. I wanted to get some more oppinions abut it, while there is missconception in telecommunications connected with minimum possible irradiated energy...
noise dbm/hz
Thank you again, but once more I am not sure if you got actualy my question.
I do not want to measure exact noise in a system, I was just wandering if a filter can suppress the out-of-band noise bellow kT. Therefore I choose hypotetical Bs>Bf for the experiment. If the noise can...
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