Exam (elaborations)
CNM324 Exam One Questions And 100% Correct Answers
- Course
- Institution
CNM324 Exam One Questions And 100% Correct Answers...
[Show more]
Content preview
CNM324 Exam One Questions And 100%Correct Answers
What's wrong with most RF (radio frequency) setups? - ANSWER The most common
reason: RF propagation takes place in non ideal environments
Wavelength - ANSWER the distance between identical points in the adjacent cycles of a
waveform. In wireless systems, this length is usually specified in meters, centimeters, or
millimeters
Frequency - ANSWER the number of complete cycles per second in alternating current
direction. The standard unit of frequency is the hertz, abbreviated Hz.
Wavelength Formula - ANSWER speed of light (c)/frequency
What is Tx? - ANSWER Transmit power, amount of energy across a defined bandwidth.
Either measured in dBm or W
decibel (dB) - ANSWER a logarithmic unit of sound intensity
3 dB rule - ANSWER adding 3dB doubles the power, subtracting 3dB halves the power
Effective Isotropic Radiated Power EIRP - ANSWER measured in dBm = power at
antenna input [dBm] +
relative antenna gain [dBi]
Effective Radiated Power ERP - ANSWER measured in dBm = power at antenna input
[dBm] +
relative antenna gain [dBd]
, Three types of propagation frequency bands - ANSWER Very Low Frequency, High
Frequency, and Medium Frequency
Waves behave more like ____ at high frequencies and ____ at low frequencies - ANSWER
light, radio
Diffraction - ANSWER Radio path between transmitter and receiver is obstructed by a
surface with sharp irregular edges. Waves bend around the obstacle, even when LOS
does not exist
Scattering - ANSWER Objects smaller than the wavelength of the propagating
wave cause scattering of the wave to occur. E.g., foliage, street signs, lamp posts
Reflection - ANSWER Propagating wave impinges on an object which is larger than the
wavelength
Optical LOS - ANSWER is related to the ability to see one
site from the other
Radio LOS - ANSWER related to the ability of the receiver
to 'see' the transmitted signal
Fresnel Zone - ANSWER Quantifies Radio LOS, a football shaped tunnel
between the two sites which provides a path for the RF signals.
Tropospheric - ANSWER Is the lowest of the atmosphere - 10km. Reflection and
refraction happens because of moister in layers. Sometimes causes Ducting RF
propagation that occurs in anticyclonic weather
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller Stetson. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $9.99. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
67163 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now