NT1K – RTLSDR W- RTL2832U and E4000 Tuner

NT1K - RTLSDR W- RTL2832U and E4000 TunerTesting out the EzCap EzTV668 that has the RTL2832 and the E4000 Tuner Chip. I think it’s much better that the FC0013 Tuner. However don’t take my word for it. For $20 you can’t complain either way at 00:40 you will hear a conversation on a local repeater (W1TOM 146.940), One of the stations is close by my QTH and with the 2Mhz sampling, you can see both the output of the repeater and the -600khz input from the operator. 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

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:

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