Mickydawg25 said:Homework Statement
A signal needs to be transmitted over 1.1km, with 12Hkz bandwidth on FM carrier.
Carrier freq=875MHz.
Allowed up to 1W carrier power transmitted and received thru omnidirectional antennas.
antennas low loss, max attenuation = 0.1dB
Homework Equations
Received Power (dBm) = Transmitted Power (dBm) + Gains (dB) − Losses (dB)
The Attempt at a Solution
I'm beat
Mickydawg25 said:are the losses the free space path losses?
((4*3.14*1100*875000000)/300000000)^2
is the gain the attenuation ie G -0.1dB?
Power=1watt=30dB?
The link budget for a transmission can be calculated by adding up the gain and loss factors in the signal path. This includes factors such as antenna gain, cable loss, and atmospheric attenuation. The formula for link budget is:
Link Budget = Tx Power + Tx Antenna Gain - Cable Losses - Atmospheric Attenuation + Rx Antenna Gain - Rx Sensitivity.
For a 1.1km transmission with 875MHz carrier frequency, the specific gain and loss factors for each component must be determined and plugged into the formula to calculate the link budget.
The distance of the transmission can greatly impact the link budget as it directly affects the path loss. As the distance increases, the signal strength decreases, leading to a lower link budget. This is because the signal has to travel through more atmosphere, which causes attenuation, and also experiences more free space loss. Therefore, for a longer transmission distance, the link budget needs to be optimized with higher gain factors in order to maintain a strong and reliable signal.
The carrier frequency in a transmission can be affected by various factors such as interference, multipath propagation, and atmospheric conditions. Interference from other signals or sources can cause noise and affect the clarity of the carrier frequency. Multipath propagation occurs when the signal reflects off of objects in the environment, causing multiple signals to reach the receiver at different times. This can cause distortion and signal loss. Atmospheric conditions, such as rain or fog, can also affect the carrier frequency by causing attenuation and reducing the signal strength.
To optimize the link budget for this specific transmission, the gain and loss factors for each component need to be carefully selected and adjusted. This can include using high-gain antennas, choosing the right type of cable with low loss, and accounting for atmospheric conditions. The use of repeaters or amplifiers may also be necessary to boost the signal and improve the link budget. Additionally, proper positioning and alignment of antennas can also help optimize the link budget.
Optimizing the link budget is crucial in ensuring a reliable and strong signal in a transmission. A higher link budget means a stronger signal, which leads to better data transmission and reception. This is especially important for long-distance transmissions, where the signal can easily weaken and become distorted. Optimizing the link budget also helps to minimize errors and reduce the need for retransmissions, leading to more efficient and effective data communication.