Call Search
     

New to Ham Radio?
My Profile

Community
Articles
Forums
News
Reviews
Friends Remembered
Strays
Survey Question

Operating
Contesting
DX Cluster Spots
Propagation

Resources
Calendar
Classifieds
Ham Exams
Ham Links
List Archives
News Articles
Product Reviews
QSL Managers

Site Info
eHam Help (FAQ)
Support the site
The eHam Team
Advertising Info
Vision Statement
About eHam.net

   Home   Help Search  
Pages: [1]   Go Down
  Print  
Author Topic: What is a better SDR Interface to the Computer?  (Read 5498 times)
N5RWJ
Member

Posts: 461




Ignore
« on: January 28, 2012, 02:30:01 PM »

Ethernet or USB-2 ?
Logged
KE5JPP
Member

Posts: 0




Ignore
« Reply #1 on: January 28, 2012, 04:49:34 PM »

Ethernet or USB-2 ?

Both have their advantages and disadvantages.  As for Ethernet 10 BASE T is really too slow, 100 BASE T is slightly slower than USB 2, and 1000 BASE T is definitely faster.  1000 BASE T is wasted if the computer does not have a very high end processor to take advantage of the increased data bandwidth available.

Gene
Logged
N5EG
Member

Posts: 254


WWW

Ignore
« Reply #2 on: January 29, 2012, 12:59:04 PM »

Ethernet is better if you want to network multiple computers with one SDR radio (or even multiple radios). However many of the 100-BASE-T consumer grade Ethernet switches do not achieve anything close to 100 Mb/s throughput; some are in the 15 mb/s range.  This could cause you problems if you need higher actual rates approaching 100 Mbps. A google search may lead you to sites that can advise as to your particular switches actual throughput.

If you just want one radio to talk with one SDR radio, USB 2 gives you a good chance to actually achieve throughput, especially if you avoid USB hubs and connect one computer directly to one radio.

-- Tom, N5EG


Logged
WS4E
Member

Posts: 232




Ignore
« Reply #3 on: January 30, 2012, 10:12:10 AM »

I am not sure where your going with this, since most SDR 'interfaces' are the I/Q lines to a sound card....the sound card is important, and is usually PCI/PCI-X, USB, or Firewire.  USB usually uses the most CPU, while PCI and Firewire are better performing. 

I use a ASUS D1 PCI Sound Card, and a EMU FA-66 Firewire sound box, and both provide full 192khz SDR performance.
Logged
KE5JPP
Member

Posts: 0




Ignore
« Reply #4 on: January 30, 2012, 12:36:39 PM »

I am not sure where your going with this, since most SDR 'interfaces' are the I/Q lines to a sound card....the sound card is important, and is usually PCI/PCI-X, USB, or Firewire.  

I don't think he is asking about old outdated sound card based SDRs like the Softrocks, Genesis, LD-1, SDR-1000, etc...  He is asking more about the modern direct sampling SDRs like the Perseus, QS1R, RF Space, or Winradio Excalibur.  I would not say that "most SDRs" use I/Q to the soundcard either.  The modern direct sampling SDRs provide bandwidths much greater than 192 kHz.  The old fashioned sound card QSD based SDRs are limited in bandwidth by the common sound card rates of 48 kHz, 96 kHz, and 192 kHz.

Gene
« Last Edit: January 30, 2012, 12:39:41 PM by KE5JPP » Logged
W6RMK
Member

Posts: 659




Ignore
« Reply #5 on: February 05, 2012, 09:19:57 AM »

the answer to the question is the classic "it depends".

If it's a SDR approach where you're basically feeding bandlimited raw samples to a PC for processing, then USB is probably easier.  If it's an approach where you have some "smarts" in the box between sampler and interface, or where you might want to have multiple PCs and multiple sample streams, Ethernet is going to be more appropriate.

If it's an SDR (a'la Flex) where you are leveraging inexpensive high volume gear (audio interfaces), then you want whatever the inexpensive audio gear uses, today, that's USB 2.  Who knows where it will be in the future?  Thunderbolt? USB3? something new?
Logged
N5RWJ
Member

Posts: 461




Ignore
« Reply #6 on: February 12, 2012, 03:27:31 PM »

Ethernet or USB-2 ?
I think in the future, you will need Ethernet?
Logged
KE5JPP
Member

Posts: 0




Ignore
« Reply #7 on: February 12, 2012, 03:30:45 PM »

Ethernet or USB-2 ?
I think in the future, you will need Ethernet?

USB 3.0

Gene
Logged
Pages: [1]   Go Up
  Print  
 
Jump to:  

Powered by MySQL Powered by PHP Powered by SMF 1.1.11 | SMF © 2006-2009, Simple Machines LLC Valid XHTML 1.0! Valid CSS!