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(a) Calculate the length of a quarter-wave vertical antenna for each of the following services: CB radio at 27 MHz; cordless phone at 49 MHz; FRS at 460 MHz; cellular radio at 800 MHz; and PCS at 1800 MHz.
(b) What can you conclude about the ease of designing portable transceivers for each of these services?
Take a simplistic approach to get a rough estimate. Find the width of each RF channel and the number of voice channels per RF channel. Ignore control channels. Calculate spe
Assuming equal transmitter power applied to both of the above antennas, would there be any difference in the power density generated at a receiving antenna? Assume free-spac
As we saw earlier in this book, ordinary digital wireline telephony uses a bit rate of 64 kb/s for each voice channel. Find the ratio by which the data has been compressed i
A receiving installation has a G/T of 30 dB. If its antenna gain is 50 dBi and the antenna noise temperature is 25 K, what is the equivalent noise temperature of the receive
Find the noise temperature of an antenna on a satellite if it looks at the earth (giving it a "sky" noise temperature of 290 K) and is coupled to the reference plane by a wa
Note that your path loss calculation ignores losses in the reflection at the moon's surface. What can you conclude about the likely commercial possibilities of this idea?
Suppose a POCSAG system at 1200 b/s is replaced with a FLEX system at 6400 b/s. Give an estimate of the increase in capacity. (The answer will not be precise because the two
The Pew researchers report that differences between opinions expressed on the two surveys were not statistically significant. Explain what "not statistically significant" me
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