RTL2832 SDR + WRPLUS : WFM test

RTL2832 SDR + WRPLUS : WFM testEZCAP “EzTV646″ with E4000 Tuner , librtl2832++.dll, and “”tuner=e4k” configuration. (from balint256) Drivers and dll: wiki.spench.net Wrplus: For E4000 tuner, add “”RTL readlen=8192 tuner=e4k”” to Device Hint tuto in French: Source

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SDR# RTLSDR videomate U680F E4000.mov

SDR# RTLSDR videomate U680F E4000.mov Source

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Measurements of E4000 Filter Responses

I wrote a octave wrapper around the rtl-sdr library of osmocon. With a little change, to also export the rtlsdr_i2c_read/write_reg function as well as the rtlsdr_set_i2c_repeater function. I then let the standard library do its normal work and just before measuring, I overwrite the E4K_REG_BIAS, E4K_REG_SYNTH1 and E4K_REG_FILT1 registers to their appropriate settings.

Raw data is available. The image itself is pretty raw. The only modifications are a shift of 3 dB below 350 MHz, to compensate the loss due to for 3-phase mixing. and a moving average of 10 samples, to smoothen the curve a little.” — kirepudsje

Source: Reddit Post

Homemade Discone for RTL-SDR Use.

“I have been getting into software defined radio via RTLSDR and found the stock antennas woeful for reception and picked up a tonne of noise from my LCD and laptop – though it’s hardly surprising.  So to improve the situation and spend as little as possible I decided to make a discone antenna.  After some research I happened upon VE3SQB’s site and a neat discone design program for Windows.  As a compromise between frequency and unwieldyness I settled on 130MHz as the lower bound.  Discones are inherently wideband and I expect the antenna to be useful for reception in the 60MHz to 1700MHz band the E4000 tuner can work with.” — http://helix.air.net.au

Verified RTL2832u & E4000 Source

Just thought I would give some links to a source based on personal experience. I’ve ordered multiple dongles from AliExpress with GREAT results. I paid extra for DHL shipping and my dongles arrived from China to the West Coast of Canada in just 3 days!

Here are links for: 1 Dongle, 2 Dongles, 6 Dongles from Newsky being sold as model TV28T (Note: slight circuit difference from original TV28T received, but works)

Note to NEW AliExpress members, I believe you should get an additional $5 at checkout. I noticed when placing my first purchase there was a coupon available just before payment. Not sure if there was a minimum order (I spent $65 the first time for 2 dongles + DHL shipping).

Image of dongle received on 4/23/2012:

RTL-SDR and GPS/GNSS

Over on Michele’s GNSS blog He has supplied some interesting information on her testing with A Newsky TV28T and GPS signals. It yet again reinforces the idea of E4000 being the current “best” tuner controlled by a RTL2832U.

(image source: http://michelebavaro.blogspot.it)

“For once, the group of innovators is European.
“These guys of osmocom are smart and -what’s even better- their work with the open source team. RTL-SDR is, I believe, one of the freshest finds in the Software Defined Radio domain. The Fun Cube Dongle, developed in UK, is already a very clever tool. But finding the super-tuner Elonics E4000 (note, again a UK Company) in 25$ USB DVB-T dongles and being able to grab data in a 3MHz bandwidth between 64MHz and 1.7GHz… that is really cool.” — michelebavaro

Link: Spring News in GNSS and SDR domain

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