Because of the high maintenance needed to monitor and filter spammers from the RF Cafe Forums, I decided that it would
be best to just archive the pages to make all the good information posted in the past available for review. It is unfortunate
that the scumbags of the world ruin an otherwise useful venue for people wanting to exchanged useful ideas and views.
It seems that the more formal social media like Facebook pretty much dominate this kind of venue anymore anyway, so if
you would like to post something on RF Cafe's
page, please do.
Below are all of the forum threads, including all
the responses to the original posts.
|Loren A. |
Post subject: DSO sampling speed Q.
Posted: Sun Oct 03, 2010 10:00 am
Joined: Fri Jul 16, 2004 4:12 pm
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.
Post subject: Re: DSO sampling speed Q.
Posted: Wed Oct 06, 2010 10:54 am
Joined: Sat Nov 08, 2008 11:35 pm
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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