15 Threads found on edaboard.com: Measure Field Strength Antenna
You can not measure receiver sensitivity without modulated signal generator at input signal frequency and level meter to measure signal/noise ratio or BER of output, demodulated signal. Kind of instruments depends on type of modulation you are using.
RF, Microwave, Antennas and Optics :: 10.06.2004 05:54 :: Borber :: Replies: 8 :: Views: 2349
I understand you would like to measure E-field strength (expressed as power density, uW/m2).
Here are a few links to RF field strength meters:
RF, Microwave, Antennas and Optics :: 16.08.2006 13:28 :: VSWR :: Replies: 9 :: Views: 791
You can manage the problem by using tuner-IF section of a TV receiver. It has I2C for channel selection and IF section with video and sound demodulators. IF amplifier-demodulator chip has AGC pin which gives a voltage proportional to antenna signal and it can be used for signal level measurements.
Hobby Circuits and Small Projects Problems :: 23.07.2007 18:44 :: Borber :: Replies: 3 :: Views: 1500
I need to design an antenna and a rectifier circuit at 27 Mhz in order to measure the strongness or weakness of the 27 Mhz signal by multimeter. please give me instruction for calculation of value of the single diode, rectifier capacitor, resistor
Thank in advance
Analog Circuit Design :: 15.10.2010 06:16 :: bkd :: Replies: 1 :: Views: 829
I was woundering how to measure the total electric field strength from different simultaneous sources at a certain point.
what I know is that the antenna factor is useful only if there is an incident plane wave from one direction.
what if there were more than one plane wave? how can the (...)
RF, Microwave, Antennas and Optics :: 09.11.2010 23:42 :: abees81 :: Replies: 0 :: Views: 265
field strength measurement won't give more than just a order of magnitude for distance I think. Furthermore, with presence of reflecting objects, you'll possibly observe field strength zeros within the Fresnel zone.
State of the art for RF based position detection is time-of-flight respectively phase (...)
RF, Microwave, Antennas and Optics :: 14.09.2011 15:23 :: FvM :: Replies: 7 :: Views: 2474
Hello antenna experts,
I am trying to measure the peak of ac voltages across loop antennas. The more accurate, the better. I wonder what equipment I should use? Will a digital oscilloscope suffice? The voltage could be lower than ~100mV. And also, I'd also like to observe the phase difference between two voltages.
Please advice some (...)
RF, Microwave, Antennas and Optics :: 21.08.2012 19:30 :: grit_fire :: Replies: 15 :: Views: 676
SAR is a measurement of near field strength.
Somebody say SAR is proportional to antenna gain and pattern.
But antenna gain is from far field measurement.
Therefore, I think SAR can be reduced even using a larger gain antenna.
But I don't know how.
RF, Microwave, Antennas and Optics :: 22.01.2003 04:09 :: uummcc :: Replies: 4 :: Views: 1910
I have a GPS p@tch antenna with a very thick substate. Is there any way of extracting surface wave strength by software simulation or measurement?
My suggestion is:
- simulation in IE3D with infinite dielectric.
This inf. dielectric layer will guide out the surface waves
RF, Microwave, Antennas and Optics :: 26.06.2004 08:35 :: eirp :: Replies: 4 :: Views: 1274
I want to interface radio to PC plz note in mind i want to measure the electromagnetic field strengths of different FM, AM, TV stations can any body help me , or else is there any device that can be used to do it ,or any software
Service Manuals, Requests, Repair Tips :: 12.12.2007 07:49 :: bavamurali :: Replies: 2 :: Views: 628
You don't provide much information at all.
- involved RFID standard?
- utilized reader chip?
- did you measure the field strength at the card's location with a test coil? (A test coil is basically an oscilloscope probe with a wire loop of known area)
- did you see any load modulation (card response) with the test coil?
RF, Microwave, Antennas and Optics :: 09.06.2009 12:37 :: FvM :: Replies: 2 :: Views: 3248
I am doing my work training and my task is to learn how to use a newly bought EXA signal analyzer to carryout some measurement on RFID system. but the problem is i dont know how to connect the tag and reader system to the signal analyzer. am i to use a probe or what? what kind of connection should i make? am confused.
Digital communication :: 02.07.2009 08:39 :: lassi :: Replies: 5 :: Views: 909
As a first remark, induction loops for hearing assistance are in fact transmitting unmodulated audio signals, so they are wide band rather than tuned circuits. There are however other induction loop systems using modulation.
To characterize the transmission system, you would want to measure magnetic field strength. A loop (...)
RF, Microwave, Antennas and Optics :: 13.05.2011 17:27 :: FvM :: Replies: 3 :: Views: 496
what do you mean by isolated antenna?
do you want to measure practically or this is just a question?
I meant do you have mesurment systems like VNA?
RF, Microwave, Antennas and Optics :: 09.07.2011 05:53 :: young.microwave.eng :: Replies: 5 :: Views: 367
As a new prgrammer, im not sure what you mean by this. Can you provide more details on how to measure the field strength?
Microcontrollers :: 22.02.2012 18:05 :: corndog22 :: Replies: 2 :: Views: 710