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Hi Erik, my laptop doesn't have an audio in jack, thus the need for the audio card. But.... I think there are bigger issues with the measurement technique. You alluded to this in your emails. For this

Allen, It may not bee needed to have an external USB audio. I also tried with 16bit 192kHz regular PC audio line and it also worked.

I bought its kid brother (DSO338) and it sort of works. Bandwidth is by no means 30 MHz as the amplitude of the signals is 3 dB down at about 10 MHz. So if you want to have an idea what type of signal

Hi Erik, I'll try and duplicate your results. I'll have to purchase a USB audio card for my PC, but I think I have all the other components on hand or can borrow. I have one of the `green` ADF4351

Pretty nice at that price if it actually meets it specs. Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ Owner - Operator Big Signal Ranch – K9ZC Staunton, Illinois Owner

Anyone have experience with this? https://www.tomtop.com/p-e6952.html?mid=10000033401&utm_source=EDM&utm_medium=Normal+EDM&utm_campaign=E6952&utm_design=2430&utm_content=2958&aid=TTEDM190603 _._

Allen, thanks for the excellent document! Yes, I know the output phase is OK as the OCXO and the ADF4351 are slightly out of tune (200Hz) as can bee seen in the ARTA picture. This allows me to see

Erik, pls see attached application note for phase noise measurements. Page 31-32 describe the method you are trying to perform. Are you adjusting either signal to insure quadrature? The ADF4351 has

I'm using a 10MHz reference clock from the onboard xco. All settings can be seen in the screen grab of th ADF4351 tool in my first post. I tried with the doubler but that did not make a big

Hi Erik, this is a valid method for measuring phase noise. As you see, at these levels everything is sensitive. You could be seeing regulator noise as you suggest. What is the reference clock used by

Till now I always measured phase noise by using multiple ADF4351 modules. To understand the impact of loop current and loop filter changes it would be better if it would be possible to measure the

When comparing with the Phase noise scan of the famous "Scotty's spectrum analyzer with a first IF at 1GHz" I notice it is very similar Due to the level 13 mixer and the higher first IF leading to

I wish it where kHz. The scan is from 0.001MHz till 10MHz with center at 0.1MHz (is mentioned at the top of the scan.) I have no clue how I ever can improve phase noise with a factor 1000

Not bad at all, but please label the axis! Assuming the X axis is KHz, then the given data is good enough for useage in a spectrum analyzer. 73 de Thomas LA3PNA. s?n. 26. mai 2019 kl. 18:05 skrev

Using the FFT mode with its much small resolution filters and 10k points it became possible to see the PLL shoulder This was made with the first IF at 2.6GHz. Phase noise has somewhat improved due to

After some more testing some good and some bad news. The SA with audio FFT dynamic range is over 110dB with an effective IIP3 above 20dB. The problem in the signal path was a mistake in calculating

While trying to do some analysis of narrow band signals it became obvious the current design of the spectrum analyzer has two limitations. Below picture shows both of them. The signal to analyze is at

One member of this group suggested to use the SPF5189Z as IF implifier. With its low noise and high 1dBCp and IIP3 one would expect a clear performance improvement. I configured the SA with two mixers

Using an Arduino zero, two ADF4351 eBay modules, a 3000MHz eBay bridge and a triple receiver using the Simple VNA hardware (see file area) I was able to measure complex impedance's and tune filters

I tried. Maximum bandwidth ratio is less then 2. Would have been nice if a ratio of 3 would have been possible. as that would eliminate one resolution filter step I am aiming for 300kHz, 100kHz, 30kHz