All Questions
Tagged with electrical-engineering rf-electronics
32
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Tunable phase delay for RF modulation
I've been trying to understand if there's a way to create two RF signals at the same frequency with a fixed, tunable phase delay. The goal is for one to trigger an RF-modulated laser and the other an ...
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S-Parameters and Received Power for Implant Antenna
I am simulating an implant antenna using the Ansys HFSS EM simulation tool - the simulation setup looks something like this, with a transmitting (TX) antenna of transmit power $P_{TX}$ and transmit ...
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92
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IP2, IP4 relationship with P1 dB of an amplifier
It is well known that the difference between IP3 and P1 dB of an amplifier can be derived and results in a theoretical 9.6 dB difference. Can a similar relationship be derived for IP2 and IP4?
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Electrical Engineering/Telecommunications/Power Amplifiers VSWR and harmonics
How does VSWR at a power amplifier output affect the level of harmonics? and is there any textbook or paper which addresses this issue?
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32
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Evaluating bonding integrity of piezoceramic transducer
Currently I am working on a Structural Health Monitoring system utilizing piezoceramic transducers. The proof of concepts have worked very well. But we are in the process of working small scale ...
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25
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T/R switch IC - HMC784AMS8GE IC does not work properly
I want to use a T/R switch IC to select the filters. So I made a small board test HMC784AMS8GE IC like the schematic below:
The input (IN1) is the sine signal. But when I test, both OUT1 & OUT2 ...
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1
answer
54
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Why is the tv playing if the carrier frequencies in our RF project appear unsupported?
My group made an RCA video/audio to RF modulator for a school project. The video is a NTSC composite video signal. Here is a clip of our tv receiving the output of the project on NTSC channel 2:
...
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59
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Swapping transmitter and receiver locations
Pardon me if this is a silly question, because I don't quite study RF.
Let's say I have a set of transmitter (radio + antenna) and a set of receiver (radio + antenna), at location A and B ...
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62
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What are the strengths and limitations of the antenna design of the Montjuïc Communications Tower?
The Montjuïc antenna is an interesting design for an antenna. I presume the design is principally an antenna, but perhaps it is not? If the ring + mast is an antenna, how does the ring work to ...
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71
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Find electronics in wilderness; or, "I dropped my cell phone in the woods!"
Imagine I was working in the woods and dropped my cell phone somewhere in a large area where it is now hidden beneath dense vegetation. By calling it I confirm that either it has powered off or its ...
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37
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Detection of weak signal by satellites
An animal's blood pressure and/or body movements can be used to generate a few mW of electrical energy. Can an RF transmitter which radiates 1 mW be detected by receivers (without any parabolic ...
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972
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Faraday cage to reduce EMI in audio amplifier
western United States.
Problem / Question
The bad power in my house is somehow producing EMI in my audio equipment. Will a simple Faraday cage help? (Using an aluminum metal screen)
If not that, ...
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45
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Gap between the two frequencies in FSK
Frequency shift keying uses at least two different frequencies. How much should be the difference between the two frequencies so that the receiver reads the signal properly reliably? Is there any ...
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32
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Low bandwidth electronic filter
Is it possible, under current technology, to have an electronic filter in the microwave range (100 MHz to 300 GHz) with very low bandwidth , say 100 to 1000 Hz?
If yes, then what is the basic ...
- 21
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164
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Should we use ELF or ULF for very deep metal detection and which specific frequency?
We are trying to design a metal mineral deposit detection system using low frequency radio waves. I am not sure on the physics of why the ultra low frequency electromagnetic radiation can penetrate ...
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