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Have u calculated the link budget? Transmitting power is one factor in link budget. You have to find the antenna gain, sensitiivty of your test unit. Once you calcuate the link budget, you can find the distance
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Antenna is a critical part in the range, what kind of...
You must make sure all part can work properly.e.g.
1. Make sure the VCO can work. Try to apply a voltage with different voltage. See how frequenc changw during voltage change
2. Make sure the phase detect can work. Try to apply a puse in ref input and feedback input. Capture the PD output. Use...
1. Use scope the capture the waveform of loop filter. You will see the overshoot during frequneyc change.
2. Use spectrum analyzer to measure. Set SPAN=0 for desired channel. The SA will switch to time domain. You can change the freqeuncy and you will able to capture the lock time of pll
1. It may be cause by frequency pulling. Have you checked the time domain of frequency error?
2. The base frequency 26 MHz may be shifted during PA switch on. It may be caused by a lot of reason. Voltage drop or temperature change may be one of the reason. Have you checked the frequecny error...
What kind of data you are trying to transmit? Music, video or data? It is hard to tell you the answer because it is application dependent. If you want to transmit a high bit rate data, you may need to use higher frequency with high bit rate modulation.
What kind of data you are trying to transmit? Music, video or data? It is hard to tell you the answer because it is application dependent. If you want to transmit a high bit rate data, you may need to use higher frequency with high bit rate modulation.
Re: range
It is hard to calculate the range by Maths. It is because in real situation mutlipath fading is dominate. Furthermore, the componet like plastic, PCB near the antenna will affect the matching of the antenna. You should consider all the factor for calculating the antenna length.
head effect antenna
The human body aboser some RF power. So if you measure the radiation pattern you will find the pattern is not uniform since some power is absorbed.
THe hand holding the mobile phone is also affect the return loss. You should measure return loss with a phantom for more...
Hi,
Pls check the 1. Phase noise of VCO. High phase noise may cause modulation spectrum fail
2. Loop BW of PLL. Try to reduce the loop BW a little bit.
3. Have u checked the receiving IQ data? Is that normal. If the received data is adnormal...
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