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Last edited: Jun 3, Gold Member. Noise figure is often specified as DANL displayed average noise level. The operating bandwidth of the antenna doesn't directly contribute to the noise - it will merely affect the received signal level. The noise at the receiver is determined by the temperature and the noise figure of the receiver giving an equivalent temperature - modified by the receiver bandwidth.
Resolution bandwidth is not the same as equivalent noise bandwidth. Does your spectrum analyzer have a noise marker? Not all of them do. What model is it? I don't know if it has a noice marker. I will check tomorrow and i will tell Intronizer - Cagonizer / Sennetta Noise / Salamizer / Truitator - TDT Series 1 - Noise Movies the model exactly! I don't understant why the antenna is not contribute to the noice floor of the S.
I have the S. When i connect only one antenna with some BW in the S. A the noice floor is Snoops Upside Ya Head (Remix) - Snoop Dogg - Vapors the same:O. Thermal noise power in just a matter of the temperature - whether the source is a resistor or an antenna.
You may think that noise would add up too but it's an equilibrium issue and temperature is the only thing that counts. Some of the noise power 'generated by' one antenna will go into the other one and no more will 'go into' the receiver. In the same way, the actual noise power is not dependent upon the value of the source resistance. Last edited: Jun 12, I think my analyzer don't have noice marker. I have HP Series made in Not sure. Can you please help with answer? I think this is what i see in the display screen.
Maye there is some also - dB of noise that the Sample dETector adds. Also i think the real display BW is 1. So today i did a simple experiment with an LNA. Dear friend can you please explain with details your calculations? A just this.! First let's figure out exactly what you have. LNA is same as preamp. Can you provide model number of the LNA?
Are you sure it is 3dB NF? Where did you get dBm, measured? Same as you would see if you terminated SA input with 50 ohms. Intronizer - Cagonizer / Sennetta Noise / Salamizer / Truitator - TDT Series 1 - Noise Movies these to mW, add, then convert back to dBm and you get dBm.
Dear Someday (August 29, 1968) - Chicago - Original Album Series guy i go for sleep right now in Greece it is A and more details.
Thanks for all friend! Sorry, I had not noticed that you responded back. Glad you found your noise marker! The spectrum analyzer gain is 1 0dB. What you read on the screen is what it sees on its N-connector.
For Stop Fighting Love - Dokken - Back For The Attack, if you enable 20dB of SA internal attenuation, the screen does not drop 20dB. If you are not using the noise marker you should use RMS detector and turn on display averaging, otherwise the noise floor is quite jumpy. Noise marker result is normalized to 1Hz bandwidth regardless of your resolution bandwidth setting.
Last edited: Jun 27, Why do you think this is not right? With your video averaging enabled does the marker go from dBm to about dBm when you turn noise marker off? SA NF does depend on your center freq. This does give you better NF for spectrum analyzer alone, but normally you want to use dB this is default and good low noise preamp in front of it. Use the noise marker, that is what it is there for.
This causes under response of about 1dB. For proper noise measurement averaging should occur before log amp log of the average is not equal to average of the log. This causes under response of about 1. Noise measurements are normalized to a 1Hz brickwall filter. This causes over response of about 0. Your dBm reading without noise marker is probably because you have 10dB attenuation turned on.
This is the SA default. Make sure attenuation is on manual not auto. BTW you should be using 10dB attenuation as I mentioned in my previous post, particularly since you have a preamp. You must log in or register to reply here. Differential line receiver input stage. Last Post Jun 13, Replies 7 Views 3K. What is a reason for radio receiver noise?
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