and what if I have cochannel interference? For example in GSM networks due to the frequency reusability I might have some extra interference from an adjacent cell. I think in the C/I (SNR with no noise) tracks that. How I can find SNR or C/I in that case?
Dear sophiecentaur I would like to thank you for your answer.
I did the following assumption so to simplify things:
I have a perfect omnidirectional antenna at H and E plane, for the transmitter. All the energy is equally distributed to everywhere
For the reception antenna, let's assume...
Hmm thanks for the replies ...
In telecommunications we use a lot this SNR or C/I which means that I measure the received power source against the noise. In telecommunications this 'noise' is usually what comes from the outside 'world'. How I can define that noise 'in-real-time'?
I would...
Dear all,
Let's assume that I have just bought the perfect omnidirectional antenna and I try to understand how the wavelengths are transmitted. If I got it right, there are wavelengths getting 'out' towards the 360 degrees directions.
Now let's assume that I have a perfect receiver antenna...
Dear all,
I am trying to understand something for SNR,
I know that is the ratio of the Power of a signal divided by the Power of noise.
According to wikipedia
Signal-to-noise ratio is defined as the power ratio between a signal (meaningful information) and the background noise...
Thank you very much for your answer!
The polar diagram for the reception how should be interpreted? I can see in the polar plor these 10,20,30db values. What do they really mean? +10,+20,+30 db in reception? Does this apply that the antennas has a gain in these directions?
Ok I will try to make my questions more concrete by giving a real example.
I have uploaded 3 pictures (I have hidden anything regarding model and brand) from the same antenna that is sold as receiver and transmitter antenna!
First picture
http://imageshack.us/photo/my-images/688/swrt.jpg/...
If I understand it right the low SWR is the worst the performance is. I found a SWR diagram but instead of the double dot : (1:1) it only had a signle dot . (1.1) . I assume that they are the same equal.
What would be good SWR values?
Best Regards
Dear vk6kro,
I would like to thank you for your reply. I understand that an antenna that does 'everything' is hard to find! But still I want to be able to read the plots that come with antennas so get a first feeling how good or bad can it be (a first estimation).
I have understood about the...
Dear berkeman,
I would like to thank you for your reply.
I have found few antennas that can support wide frequency ranges from few khz to few Ghz.
I have also in an spreadsheet file put the antennas with the prices, with the frequency ranges that support. Now I have also some how to qualify...
Dear all,
I am trying to understand what is the difference between a transmitter and receiver antenna.
If I recall correctly an antenna is a dipole so you can always use it to either transmit or either receive.
All the antennas that are used for transmitting purposes come with some...
logarithms and decibels please
Hi i need some good tutorials for the logarithmsI(especialy for logarithms with base 2)
and how i can calculate logarithms with base 2 when i have a simple calculator.
Also i need some decibel tutorials that can help me understand how i can perform calculations...