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: 2466
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: 827
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: 1559
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: 874
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: 302
I want to measure the distance between two objects. One is Wireless Transmitter (1st Object) and the other is Wireless Receiver (2nd Object). In between two objects, there can be many (hard) objects. But, I have to measure only the distance between Wireless Transmitter (1st Object) and Wireless Receiver. Is that possible?
RF, Microwave, Antennas and Optics :: 14.09.2011 14:00 :: speedEC :: Replies: 7 :: Views: 2973
I would measure using the usual instruments (network analyzer or signal generator + spectrum analyzer/power meter) with some high impedance (kOhm) voltage divider at the loop antenna. This gives you (relatively) high impedance to measure the voltage. Calculating the attenuation caused by the voltage divider to the 50 ohm input is easy.
RF, Microwave, Antennas and Optics :: 22.08.2012 14:58 :: volker_muehlhaus :: Replies: 15 :: Views: 783
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: 1985
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: 1375
i want to measure the electromagnetic field strengths of different FM, AM, TV stations
You can use either a spectrum analyzer or a (EMC) measurement receiver for this purpose. You also need an antenna with a known antenna factor. Logper antennas (or LPDAs) are widely used (...)
Service Manuals, Requests, Repair Tips :: 12.12.2007 09:38 :: pit :: Replies: 2 :: Views: 666
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: 3465
You may need to know a measurement problem to decide how to measure.
Digital communication :: 02.07.2009 15:24 :: FvM :: Replies: 5 :: Views: 949
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: 542
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: 407
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: 810