What is the difference between this 3 RTL-SDR products?

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SuperLOL
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What is the difference between this 3 RTL-SDR products?

Post by SuperLOL » Fri Jun 12, 2015 7:10 pm

HI,
I found 3 RTL-SDR products on eBay but i cannot find out what the difference between this 3 products are. Does anyone have more information about his 3 RTL-SDR products?

http://www.ebay.com/itm/100KHz-1-7GHz-f ... 1883600587
http://www.ebay.com/itm/100KHz-1-7GHz-U ... 1724142924
http://www.ebay.com/itm/100KHz-1-7GHz-f ... 1769188902

rtlsdrblog
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Re: What is the difference between this 3 RTL-SDR products?

Post by rtlsdrblog » Fri Jun 12, 2015 10:23 pm

There's no real difference I think, they all use the direct sampling modification to unlock the HF band http://www.rtl-sdr.com/rtl-sdr-direct-sampling-mode/. But they also add some low pass filters and impedance matching. They come in kit versions and fully assembled.

I think the last link you posted is the one made by the original experimenter who had this idea to make a direct sampling boxed unit like this and sell it. His callsign is BA5SBA, look it up on Google and you'll see images and posts of his work. The other two appear to be clones.

http://www.rtl-sdr.com/assembling-chine ... pling-kit/

If you need HF reception, the other route you can go instead of buying those units is to buy a normal RTL-SDR, and also an upconverter like the ham-it-up.

SuperLOL
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Joined: Fri Jun 12, 2015 7:03 pm

Re: What is the difference between this 3 RTL-SDR products?

Post by SuperLOL » Fri Jun 12, 2015 10:59 pm

Would be nice if we could see inside this products because it doesn't look like they are build the same.
http://www.ebay.com/itm/DIY-KITs-100KHz ... 1769188910
http://www.rtl-sdr.com/assembling-chine ... pling-kit/
Also the Blue RTL-SDR product (second link in my first post) has also sometimes in the product name (New 2015).

rtlsdrblog
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Re: What is the difference between this 3 RTL-SDR products?

Post by rtlsdrblog » Sat Jun 13, 2015 3:44 am

They both look the same to me? Just different colours. I think the one with the blue PCB is a clone of the original one.

SuperLOL
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Joined: Fri Jun 12, 2015 7:03 pm

Re: What is the difference between this 3 RTL-SDR products?

Post by SuperLOL » Sat Jun 13, 2015 4:48 pm

Yeah i think also that this Blue one is a clone. :|

I pretty new to this SDR thing. I'm also currently using a modified Yaesu VX-7R and also want to have something that i could use on my PC. :)
What would you recommend SDRPlay or RTL2832U/R820T2 or something else. :?:

rtlsdrblog
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Re: What is the difference between this 3 RTL-SDR products?

Post by rtlsdrblog » Sun Jun 14, 2015 12:12 am

It depends on what you want to use the SDR for and your budget.

The RTL-SDR is the cheapest one, with the most software for it, but also the worst when it comes to specs and does not do HF without mods or an upconverter.

The SDRPlay is $150, is only compatible with a few programs at the moment, but it has good specs and tunes down to HF.

The Airspy is $200, is only compatible with a few programs at the moment, but it also has good specs (maybe a little better than the SDRPlay), but it does not tune down to HF without an upconverter.

The units you've been looking at are modified RTL-SDR dongles. Basically these guys take a normal mass produced RTL-SDR dongle and solder it into another PCB which enables the HF mode and other features like a bias tee. It's pretty good, but for $100 more you can get the SDRPlay.

If you just want to get your feet wet with SDR, get a standard $10-$20 RTL-SDR first. The difference between a $10 and $20 standard RTL-SDR is mainly R820T vs R820T2, whether or not it ships locally, or from China and sometimes whether or not they have upgraded other components.

But if you really want HF straight away then maybe go for the modded ones, or just jump straight to the SDRPlay or an HF only SDR.

http://www.rtl-sdr.com/roundup-software-defined-radios/

SuperLOL
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Joined: Fri Jun 12, 2015 7:03 pm

Re: What is the difference between this 3 RTL-SDR products?

Post by SuperLOL » Sun Jun 14, 2015 1:16 am

I will hold of a little bit and see if SDRPlay can fix the gap between 380-430 MHz for almost 200€ this is something that really bugs me. :D
And when i win the lottery i buy the Noctar. :lol:

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