Adventures in Software Defined Radio (SDR) via a DVB-T USB

After a friend told me about their own SDR setups, I though I would take the sub $10 investment to have a tinker myself.

While I have never been into the HAM radio scene, at this low cost, having the ability to scan a wide range of frequencies via my desktop was enough to get my attention.

The two most common entry level USB's, commonly sold as cheap USB DVB-T dongles both sport a RTL2832U chipset, there are older references on the web to the E4000 Elonics Tuner, rare enough for an asking price 4 times what it was 24 months ago for the places that have stock, and the more common and newer R820T Tuner.

While it would be some time until I would be at a level that I would notice a difference from one tuner to the other, outside of the slighly limited frequency range of the E4000 (52MHZ -to 1100MHz & 1250MHz - 2200MHz) compared to the R820T (24MHZ - 1770MHz), I wanted to try for a E4000 as my friend had the R820T.

Selling R820T's as E4000's

Alibaba has a ton of these, or at least claim too of which I got two of the variety below. Not sure of the exact sellers as I gave a few links to my Wife for birthday ideas as few months ago, though I know she got them from 2 different vendors

Some are boxed in the Digital Energy Branded Mini Digital TV Stick, sporting the text DVB-T+DAB+FM.

20140508_214929

The hardware ID PID 2838 matched to the E4000 according to this SDR Wiki.

SDRHWID

However, closer investigation shows this was in fact a R820T.

Here is the PCB, case & antenna of my Sticks

My USB

My USB

And here is one I found on Superkuh's Blog, which he stated he purchased early 2012.

http://superkuh.com/rtlsdr.html

http://superkuh.com/rtlsdr.html

Notice the PCB Layout Differences.

Close up of the two Tuner Chips.

E400 on Left, R280T on Right

E400 on Left, R280T on Right

It seems this enclosure used to hold a E4000 years ago, and Alibaba vendors are selling them as E4000's, which are more desirable for those wanting to utilise the higher frequencies.

Not a big deal I kind of though it was too good to be true to get a E4000 via Alibaba at a R820T price, and since the current going price on a E4000 ($65 at the time of this post), I wasn't out anything I would have been sourcing a pair of R820T's.

There is a MCX plug on the side, which resulted in a purchase of a MCX to Coaxial adapter that will be arriving soon though some USB models have a RF Coaxial instead.

20140508_213958

After the un-boxing, it was time to try out some software.

Windows SDR Software

There are plenty of blogs and pages that go into the details of installing the USB drivers, and setting up SDR# (SDR Sharp), and the add-ons needed for the RTL2832U, and a ton of other plugins. As well as setup for another common entry level SDR package, HDSDR.

While, I am lucky to get a FM signal at all thanks to the mini antenna, I do manage to get the 3 main local FM stations on SDR#

SDRSharp

Similar results on HDSDR.

HDSDR

Not all too impressive quite yet.

Once the MSX to Coax arrives I'll be able to plug it into the TV Antenna and get a much better signal. and start scanning more frequencies

 

 

 

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