Linked Questions

13
votes
5answers
3k views

How did wireless telegraphy reach so far?

Even as far back as the early 1900s, telegrams transmitted wirelessly could reach hundreds of miles. For instance, the Titanic communicated with Canada, 400 miles away, with relatively low-powered ...
11
votes
3answers
13k views

What are the units of RSSI, noise and SNR as defined by IEEE 802.11?

I'm a CS graduate, but to my shame have very limited knowledge of electrical engineering and especially antenna theory. As far as I understand, RSSI determines quality of how measurer "hears" the ...
0
votes
2answers
2k views

FM Transmitter Power and approx Transmission Distance Calculation [closed]

I am a beginner of electronics and mostly fascinated by hobby circuits right now. I do not have any Electronics Degree. Internet and hobby Electronics books are the only places where I learned lill-...
0
votes
5answers
420 views

Will the data throughput decrease if the transmitter and receiver are in motion?

What I'm thinking of is a 2 way communication (voice communication) between two systems which are in motion. (like 100 km/h difference) Will the data transmission and reception be disturbed, by how ...
0
votes
2answers
1k views

calculating maximum transmission distance of radio module based on dbm and open air

I own several HM-TRP TTL FSK radio modules, and every time I turn one on, it reports it as being version 2. Anyways I did read the manual and it has a setting for transmitter power as follows: <...
0
votes
1answer
682 views

Just I want to understand gain, power, link budget

I am a beginner, I am confused about calculating the nessecary gain and power and sensitvity to overcome path loss at certain distances. the first thing what does gain mean ? I am not talkink ...
0
votes
2answers
296 views

Long Range Arduino Water Monitoring

I'm looking for advice on how I should setup a long range irrigation monitoring system using multiple Arduino boards. I would like advice/options available on what hardware I require to achieve my ...
0
votes
2answers
207 views

How to derive voltage applied to an antenna, where transmitter power is known & identical tx/rx antennas are used with known gain/impedance?

Question: Imagine a transmitter + transmitter antenna with the following characteristics: 433Mhz transmitter transmitting 10dBm Into an impedance matched (50 ohms) antenna, omni-directional, 3dBi ...
0
votes
2answers
149 views

Wireless Sensor Network Fundamental?

I am currently investing the topic: Wireless Sensor Network. Specifically, I need to show the calculation of how much power received against distance between the transmitter and receiver in WSN. ...
0
votes
1answer
59 views

Range of FM and Power

Why is the range of an FM signal shorter than AM signal? I thought it was due to the high frequency of FM signal getting absorbed by physical barriers. Is it so? Does power of a signal has any role to ...
1
vote
2answers
109 views

How same frequency signal with different power are produced?

My router have settings to configure transmission power and as i know energy of a signal is given by $$ E = h\nu $$ where \$E\$ is the energy of the signal, \$h\$ is Planck's constant, \$\nu\$ is ...