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Copyright: 1996 - 2024

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RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The World Wide Web (Internet) was largely an unknown entity at the time and bandwidth was a scarce commodity. Dial-up modems blazed along at 14.4 kbps while typing up your telephone line, and a nice lady's voice announced "You've Got Mail" when a new message arrived...

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RF Cafe Forums closed its virtual doors in 2012 mainly due to other social media platforms dominating public commenting venues. RF Cafe Forums began sometime around August of 2003 and was quite well-attended for many years. By 2010, Facebook and Twitter were overwhelmingly dominating online personal interaction, and RF Cafe Forums activity dropped off precipitously. Regardless, there are still lots of great posts in the archive that ware worth looking at. Below are the old forum threads, including responses to the original posts.

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Loren A.
 Post subject: DSO sampling speed Q.
Posted: Sun Oct 03, 2010 10:00 am 
 
Captain
User avatar

Joined: Fri Jul 16, 2004 4:12 pm

Posts: 8

I need to buy a DSO for probing some RF paths at around 460 MHz. The signals are QPSK at around 100 kbps. I'm not real familiar with DSO sampling requiements. The scope manufacturer guidelines seem to suggest a BW at least 4x the highest frequency to be measured, so than means around 2 GHz. That's a pretty expensive DSO.

Can I mix the sampled RF down first either to baseband or some IF and expect to get a good representation of the original signal? Of course that would mean making sure the conversion was done properly, but are there any good reasons to go ahead and sheel out the dinaros for an expensive scope vs. downsampling and using a less expensive scope? Thanks.


 
   
 
SunshineDesign
 Post subject: Re: DSO sampling speed Q.
Posted: Wed Oct 06, 2010 10:54 am 
 
Colonel

Joined: Sat Nov 08, 2008 11:35 pm

Posts: 30

Location: Ramona, CA

No reason to by 2GHz Oscope. You can downconvert and sample with a much lower cost digitizer. National makes some nice digitizers that give you resonable Spectral Analysis results. Just make sure you downconvert to a frequency range that gives you the full modulated bandwidth.

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Posted  11/12/2012

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