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Topic: What is spectral purity?
Total Replies: 5 Reply To This Topic

What is spectral purity?
MtestSys on 3/1/2010 4:48:00 PM

re:What is spectral purity?Best Answer!
Spectral purity is the inherent stability of a signal and to test receiver selectivity, a signal generator must have good spectral purity or SSB.
xtraselectronics on 3/2/2010 12:03:00 PM

re:What is spectral purity?Best Answer!
I test radar systems which has higher requirements for my spectral purity for my local oscillators/signal generators as I need greater resolution on my targets. They must detect very low level return signals, which have very small doppler shifts. Spectral purity affects my phase noise (SSB), spurious and Residual FM.
Crasium on 3/3/2010 10:33:00 AM

re:What is spectral purity? 
Which Signal generator has the best Spectral purity or SSB?
MtestSys on 3/3/2010 6:18:00 PM

re:What is spectral purity? 
For the longest time it was the HP 8663A which went down to like -130dBm but today Agilent has the replacement model the Agilent U8663B but it is super expensive. You can find an old 8663A in the used market for around $5K. The new Agilent U8663B goes for like $45K. the trade off is the old 8663A is not supported and is over 20 years old.
xtraselectronics on 3/5/2010 11:32:00 PM

re:What is spectral purity? 
I had the old 8663A and it was great. A good work horse but because of support when my unit failed I had to upgrade to current technolgy as our asset manager didn't want anything in our lab that was not supported even if the product was superior. I had to move to the Rohde and Schwartz SMB100A which went down to -145dBm for around $10K. The Rohde and Schwartz SMA100A is also a nice Signal Generator but it run in the $35K range close to the Agilent U8663B
Crasium on 3/7/2010 2:10:00 PM


Total Replies: 5 Reply To This Topic

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