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47 Threads found on Spectrum Analyzer Bandwidth
Hi, I am trying to transmit signals using ADF7242 at 2.4 Ghz. The chip supports IEEE 802.15.4 std. I would like to see the signal strength of the received signal and it's bandwidth. I don't have a spectrum analyzer! The next choice was to use some wifi spectrum analyzer app but wifi follows IEEE 802.11 (...)
Hi, my question is simple. Will this homebrew spectrum analyzer outperform the FFT of the HP-54520A, in terms of: 1. dynamic range. 2. input sensitivity.
Hello, because of space limitation, I want to buy a USB oscilloscope and spectrum analyzer. My main interest is at HF work, so 30MHz analogue bandwidth at least. a 100-200MHz would be better so as to be able to measure harmonics as well. Which ones would you suggest for: 100-200MHz analogue bandwidth. scope combined with (...)
which would of course read 3 DB on a power meter or spectrum analyzer face!
Hello everybody, i'm new in the forum. I have a fundamental doubt and I can not get over it. If I measure a sine on a spectrum analyzer, how I can measure it's bandwidth? Let's suppose a have a Gaussian shape with a certain 3db bandwidth; my problem is that if I change the frequency window, resolution and sampling (...)
Hi, Allow me to ask a simple question that I cannot figure out. If the input wave form to spectrum analyser is as below. What would be the output waveform with respect to the resolution bandwith setting? Besides, which kind of tools is easiest to go above test? Thanks! Best regards,116554
Thanks. With my spectrum analyzer I have tracked many peaks and valleys from 26 Ω to 88 Ω along the receiving span, measuring every 10MHz; but larger/lower readings may be hiding in between samples. Matching 75Ω over the full bandwidth does not make much sense. Impedance is tied to a frequency, or perhaps at
you need to set the spectrum analyzer to a 100 KHz resolution bandwidth. period. that is the spec. if they wanted it measured in a 30 hz bandwidth they would have written that as the spec. If you are having trouble with the noise floor of your spectrum analyzer, filter/null out the (...)
What exactly is the type of modulation in the DSSS? the amount of "power" contained in a broad bandwith can "appear" to be different when viewed on a spectrum analyzer set to a narrow resolution bandwidth. For instance, FSK is a contant envelope signal and can appear to be bigger than QAM if captured in a small resolution bandwith. (...)
spectrum analyzers are useful for Bode Plots with synchronous FM to sweep similar to a Network analyzer but less powerful. For RF it is used for THD, IMD, 3rd Order Intercept on power output distortion, SNR, CNR, FM deviation, Spectral bandwidth of any modulation, linear or log-log display, Phase noise, output power vs (...)
How can we define the sensitivity of a spectrum analyzer ? is it same as that of normal receiver and can anybody write the equation.
Well....what they want is for you to insure that low frequencies out of your band are below -55 dBm/MHz. i.e. you set a spectrum analyzer to a resolution bandwidth of 1 MHz, and sweep from 5000 to 5850, and you should not see the trace go above -55 dBm at any frequency. So the first thing you do is set up your system to transmit normally (...)
Hello,all, Pls. help to advise how about the phoise noise of my PLL. Three loop bandwidth have been tried and attached,5K,10K and 20K,and the actual bandwidth in spectrum analyzer is much wider. Different bandwidth different phase noise,and even the lock time. How about the three curves,please (...)
not many noise sources have enough output power. I agree. Even if you amplify the signal, the "signal" power in the given measurement bandwidth (spectrum analyzer BW) is only a very small fraction of the total noise power. Let's assume you have a noise source followed by a nice power amplifier, with total
Agilent application note: 8 Hints for better spectrum analysis.
Consider the Spectral density meter, A.k.a. spectrum analyzer. The entire inoput bandwidth is up converted to an IF above the maximum instrument BW then down converted to 2nd IF 75MHz and then 3rd IF1@ 10.7MHz then log detected to baseband. Here negative frequencies are shown on display, which as you say seems illogical but actually (...)
Hello guys, I’m designing a simple ring oscillator. I’m going to measure the phase noise and the output voltage swing of this oscillator. Can I use the spectrum analyzer to see and measure the output voltage swing? Can I see time-domain signal? (Or I'll be able to see only the frequency domain?). Thanks very
It's like the difference between a wide-angle lens and a telephoto lens. The wide angle shows you a large field but with less resolution. The telephoto gives you more detail, but you have to take more pictures to see the same area you saw with the wide angle. The spectrum analyzer takes a picture of a portion of RF spectru
One of 3 things is going on... 1) The spur is very narrowband, and the sweep time you are using is not allowing the spur's true energy to be measured. The spectrum analyzer sweeps by before the resolution bandwidth filter responds fully. 2) The spur (especially the one at marker 3) is not really a cw tone spur, but a broad noise source. (...)
Assumptions: easily available and cheap components FFT analysis, measurement of frequency amplify, bandwidth control Software: Written in C, about 7kB. It was written optimally. Hardware: Hardware of this device is also fair
A spectrum analyzer is nothing more than The bandpass filter in the front end limits how much energy width (in frequency) gets to the power detector by setting the RBW ( and also the center frequency F0). AFTER the pow
Hi! I am working on the design of Photodiode Transimpedance Amplifier. Can anyone tell me how can i test the bandwidth of Photodiode Transimpedance Amplifier without having any spectrum or network analyzer?
Noise Figure is a metric for measuring the Signal to Noise Ratio degradation, when Noise Power generally is the total noise per bandwidth at specific frequency. So, better than using a Noise Figure analyzer is to use a standard spectrum analyzer and measure the noise power at particular frequencies in dBm. If you want to (...)
Sometimes average power measurement is needed in case of spread spectrum signals or WCDMA etc.Because power is spreaded in a bandwidth and it can be difficult to measure wit SA.(Modern SAs can handle this problem with expensive peronality options) Power meter can be used with a proper filter for these kind of measurments with.
You can think that a spectrum analyzer is a superheterodine receiver (with one, or multiple IF conversions), where the RBW is given by the bandwidth of the IF filters. Video bandwidth is given by the bandwidth of the filters placed after the detector.
Could anyone help me in measuring bandwidth of FM receiving signal on spectrum analyzer like what should be the values of RBW, VBW, SWT, Span, Attenuation etc and which value is more accurate, 26 dB down or Null-to-Null bandwidth plz help me out
I understand, that the question is related to power measurement of wideband signals, e.g WCDMA. As a first simplified answer, to see the total signal power of the wide band signal, the RBW must be wide enough to allow the signal to fit the analyzer filter without attenuation. And detector should be operated in averaging (RMS) mode. A more verbos
does ADS provide a spectrum analyzer device?
I have a simple question about the spectrum analzyer. Is it used to measure the power spectrum density(PSD), so the measure output unit should be dBm/Hz or W/Hz? But it seems the real world spectrum analyzer output is dBm. So how can it convert back to the PSD? Is it related to the IF filter BW? And the other (...)
Signal spectrum (frequency and bandwidth) can be acquired with any auxilary antenna, e.g. a short wire for an UHF RFID (you didn't mention the frequency band at all). Exact measurement of radiated power would require an anechoic chamber and an antenna with known antenna factor. If the devices have 50 ohm antenna outputs, the transmitted power can b
These hand held spectrum analyzers are really not that good, as far as noise figure and dynamic range goes. Firstly, you do realize that the noise floor measurement will change dramatically as you change the RBW. That is pure math. If you have noise that is at -100 dBm/Hz of bandwidth, and you have your RBW set at 1 KHz, you are (...)
Inspired by this: I decided to try to design a simple homemade spectrum analyzer, based on TI/Chipcon CC1100. The SA will use the reading of RSSI from CC1100, covering 800-928MHz, and an input mixer to convert an input spectrum of 1-128MHz to 800-928MHz. The advantage is a very simpl
i think u must power up the circuit and connect the output on the spectrum analyzer and check its resonant frequency(fo) and bandwidth between "3 db points" your unloaded Q will be fo/BW. But this case emloys your phase center (0 deg phase) is near the fo.
Yep, agreed. dBm/Hz. Note that the displayed RBW usually does not exactly equal the true noise bandwidth. If the RBW says "1KHz", it might actually be 1.1 KHz when it is accurately measured. This is usually caused by the fact that you can not use brick wall filters. Why this is confusing is that usually you can change the RBW and the signa
Very important in IP3 measurement is the channel spacing between input tones and also important is the bandwidth of the system. In general the IM3 components (2f1-f2 and 2f2-f1) should be 10dB higher than the Noise Floor of the spectrum analyzer.
spectrum analyzers usually have an "auto sweep time" mode where it automatically selects the proper sweep time depending on your specified resolution bandwidth and video bandwidth. K depends on the characteristics of the particular filter used in the instrument. Here's a quote from Agilent Application Note 150, (...)
Hi Please take a look to the AN "spectrum Analysis" for HP (Agilent). You can get it from the following link. I hope this helps. regards.
Hello all, What is the abiltiy of using TV as DSO or spectrum analyzer? Did anyone try with it before? Share knowledge and ideas.. Regards, Ahmad,
If you measure a power with a large bandwidth the more accurate is the power meter (about 0.05 dB vs. 0.5 dB of a spectrum analyzer). But with the power meter you measure only a large bandwidth power (so if there are very high spurious, your measurement can not be correctly). With the spectrum you can also (...)
I have some problem using spectrum analyzer IF output signal. I want to extract a received signal with antenna and spectrum analyzer and then capture it with high speed A/D card. the spectrum analyzer's RBW is 10 MHz. 1- what is the relation of received signal (e.g. in 500 MHz (...)
Accurate power measurement should be done with linear frequency characteristic over the spectrum bandwidth of signal. All spectrum components must be "weighted" with same constant. It is possible with wide bandwidth or square shaped one. spectrum analyzer IF filter has something like sin^2 (...)
I have used spectrum analyzer to measure the 900Mhz OSC power output and compared with RF power-meter output, there are always has about 5dbm difference between them, Which one should I trust? is it possible that my spectrum analyzer needs calibration? or the spectrum analyzer shows (...)
There are several ways to measure the SHA in the lab: 1) Direct measurement: if your SHA can drive 1Mohm impedance, then you can hook up your SHA to the spectrum analyzer and measure the THD, SNR, etc; 2) Indirect measurement: have another ADC with higher accuracy and higher bandwidth. But you need to be careful about the possible (...)
Hi All, Can anyone tell me what're the differences between resolution bandwidth and video bandwidth of a spectrum analyzer? Thanks, Mesfet+
Hello friends, I am looking to construct an audio spectrum analyzer (bandwidth ≤ 20khz) using super heterodyne but I am not quite sure what part I should use, I am aware of mixer ICs on the market but their purpose are mainly focused for communication use. After reading the book Radio Frequency Integrated Circuit Design on mixers, I (...)
I feel a little confused, the Video filter is applied to the spectrum waveform ( not the time domain), right? then how can you tell " the video bandwidth is 100kHz" (for example) ? What is the physical meaning of the video filter's output?
how can i convert a old cga are vga monitor to oscilloscope (low bandwith) for spectrum analyzer ?