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nec pg
I have a NEC PG-9000 projector.
But the system circuit boad is fail.
Where can easy buy the circuit board?
Or where can find the service manual for schematic?
Thank you!
Does the S/N required will present on radio specification?
Will be testing on each radio if we want to know the radio S/N?
Or, the 5dB S/N is a general specification.
Thank you!
My radio each channel is 25KHz.
10*log(((0.18uV * 0.001)^2)/50)= -91.88dBm
NF= -91.88dBm + 174dBm/Hz -12dB -10*log(25KHz)= 26.14dB
Correct?
And then,
Why BW in dB is 10*log(BW)? Not 20*log(BW)?
Thanks you!
I would like to calculate link budget for two radio communication.
My link budget sheet is using noise figure but the radio receivier capability specification are SINAD of unit.
How to transform SINAD into noise figure?
Thanks
*My radio sensitivity is 0.18uV(12dB SINAD).
I would like to design a data wireless circuit.
Please recommend Tx and Rx chips.
The Tx I have no limitation for size but the Rx I hope very small.
Rx And Tx are separated(The mean is Rx side just can receive.).
Need separate spectrum for secure.
Data rate are low.
Frequency band are no...
qualnet opnet
I'm a begineer for communication satellite.
I'll buy a simulator for GEO satellite communication system.
The simulator will simulate QoS, data throughput...
If don't care about cost. Opnet and Qualnet which one is better for my request?
Or others simulator are suitable for me.
Thanks!
I want to design GPS receiver, enable Doppler shift to reach 40KHz.
Which part of commercial GPSR do I need to implement? What the a bit more most difficult? Which chips developed can be used? Or where is there information and is suitable for studying?
Dear sirs,
I would like to calculate GPS receiver link budget, so I need to know how about the GPS receiver information for link budget.
Does anyone can tell me, or point out the key.
Thanks!
...
GPS(USA) L1 frequency
GPS receiver on the ground
GPS receiver antenna noise temperature...
GPS S/N unit problem?
I read a GPS application(Altitude determination) paper.
And the signal to noise ratio unit is "Volts per Vote".
I don't know how to explain to dB units.
Can help me by any information?
Thanks!
measuring high power return loss
I will monitor return loss variation on 20W input.
Somebody can help me how to setup it.
My equipments:
1. EMC chamber x1
2. 50W TWTA x1
3. Network analyzer 8510c x1
4. Signal generator R&Sx1, HPx1
5. Spectrum analyzer R&Sx1, HPx1
6. 50ohm transfer to 150ohm...
I use EMC chamber to measure it.
General use a standard wide band antenna, we know this antenna gain.
And tested antenna to be apart from standard antenna 3m.(>1GHz)
Sweep a fixed power signal to the tested antenna.
Standard antenna receive and measure power of signal by spectrum.
Calculate the...
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