RTL-SDR - an SDR receiver from a cheap DVB-T tuner on a USB connector

lysy1980 wrote:

hardcore

it is hardcore for me, I do not know electronics and without a converter I can listen to something else

Mostly FM modulation is possible in the range of 50-2100 MHz.

ety wrote:

Such as this will be ok?

http://allegro.pl/tuner-tv-dvb-t-rtl2832u-r820t-sdr-e4000-nowy-model-i4977631201.html

Added after 1 [minutes]:

Some new version http://allegro.pl/tuner-sdr-rtl2832u-r820t2-13-1864-mhz-nowosc-i4990369261.html

I repeat the question.

What question? Are you having a new version? Yes it is a newer version of the tuner chip.
https://www.google.pl/?gws_rd=ssl#q=r820t2

Yes, I just meant if this newer version offers any more possibilities. I can wait, it's not on fire How do you think it's worth it?

No converter without converter you pick up nothing below 60Mhz

RAFPOL5 wrote:

Without the converter, you won't receive anything below 60 MHz

This is not entirely true, it depends on the tuner layout, and the R820T will easily pick up a band of 11 meters including 19 CB.

Of course, you need a suitable antenna, 100% not the "stump" from the set.

ety wrote:

Yes, I just meant if this newer version offers any more possibilities. I can wait, it's not on fire How do you think it's worth it?

I will say this, I ordered 2 pieces out of curiosity.

lysy1980 wrote:

I will say this, I ordered 2 pieces out of curiosity.

When it comes to you, show off here what interesting it can do Because it makes me curious

You can make the antenna, no need to buy. At the beginning, buy or make, for example, an adapter for a coaxial cable, such as for a TV, from a funny antenna cut off from this funny antenna. It does not have to be the special 50 ohms standard in radio communications.
So a cable like for a cable with a soldered plug that fits the USB dongle. You need to have enough cable so that the antenna can be placed outside the apartment.
There can be a balcony, preferably with an extension arm or a window sill, but you also need to move the antenna away from the wall of the building. You'll have a better reception.
As for the antenna itself, it depends on what you want to listen to.
At the beginning, you only need a rod of a random length soldered to the middle wire of the cable. It will be more professional to calculate the appropriate dimensions of the antenna for a specific frequency. And even more cossack but more expensive, buy a DISCONE broadband antenna and heat it up on the roof.

kisses

The tuner in the attached picture has an IEC connector, you do not need to buy vias, only an antenna plug or an F plug and reductions from F to IEC (available, among others, in DIY stores), and connect the antenna with an RG6 cable (also available in supermarkets)

Gentlemen, I need your help because I'm losing my patience
For some time I have had sharp disturbances that can be seen in the screenshot below. Today I wrapped the tuner with sandwich foil and the interference slightly disappeared, but another problem arose, after touching the usb port on the tuner with a screwdriver / knife, everything improves, if I do not touch this port with a screwdriver, it is sneezing, someone has any idea to remove these disturbances? The tuner is powered on an extension cord from the computer's USB port, wrapped in silver foil and enclosed in a plastic box. Best regards.

Connect the ground and see if it improves anything. Connect the grounding on the disconnected computer from the mains supply.

lysy1980 wrote:

Connect the ground and see if it improves anything. Connect the grounding on the disconnected computer from the mains supply.

I have the earthing connected a long time ago, the new electrical installation also has no problems with earthing.

But where are you connected to the ground?

lysy1980 wrote:

But where are you connected to the ground?

Nom the pin in the socket is ...

Do you use a laptop or a desktop computer? The fact that there is a prong in the socket (of course connected to the ground) does not mean that the ground is on the computer housing.

If you have a multimeter, check (by touching the pin in the socket and / or the strip) whether the grounding is on the computer casing and on the USB port. If it is a laptop, then 99% there is no grounding on the laptop casing, and thus also on the USB ports, and thus it is not on the tuner.

There will be a post under the post, but I do not know if anyone mentioned modified drivers for receiving frequencies from 13MHz on tuners with the R820T chip?

In the attachment, the SDR SHARP package is enough to replace the files and run the program.

Has been on the forum many times.

lysy1980 wrote:

Do you use a laptop or a desktop computer? The fact that there is a prong in the socket (of course connected to the ground) does not mean that the ground is on the computer housing.

If you have a multimeter, check (by touching the pin in the socket and / or the strip) whether the grounding is on the computer casing and on the USB port. If it is a laptop, then 99% there is no grounding on the laptop casing, and thus also on the USB ports, and thus it is not on the tuner.

I use a desktop computer, the pin in the socket is connected to the ground, I know because I did the installation myself in this house, because after all, I am an electrician The grounding on the computer casing is, as a curiosity, I will add that the same interference is when I use SDR with a laptop and a tablet, being with the same set, i.e. dongle + tablet in a completely different place, this interference was not Oo. I had a Not Only tuner that year The TV and later also showed such disturbances, although when I bought it, they were not there ....

Well, let me tell you it's strange. It is true that I have various types of disruptions myself, including from energy saving light bulbs, converters in power supplies and other electronic equipment in the home. But, for example, after going outside the building (I live in a detached house) with a MiniWhip antenna on a mast made of PVC tube and a laptop, I have a surprising improvement in noise and of course the reception becomes clear but only if I take the Lenovo X61, I also have the T60 and the latter it generates interference even if I touch the Touch Pad, of course while running on the battery.

If I were you, I would have thought about grounding and its various connection points to the computer and the tuner itself (from the USB or antenna side).

The second option is that the tuners themselves either start to die slowly, or after a certain period of work they start to work differently, they heat up mercilessly. Alternatively, voltage regulators or converters built into the tuner begin to sow ...
These are my wishes, I have never really approached the fight against interference with RTL-SDR. To listen to the frequencies that interest me, I use devices designed for this.

Gentlemen, I apologize in advance for the lame question, but will someone quickly enlighten me what Tablet will go under SDR (I have a tuner) but I do not know if a specific tablet model is needed or a droid? some info quickly would come in handy because I'm going to buy.
Sory at the last minute.

phonemen wrote:

Gentlemen, I apologize in advance for the lame question, but will someone quickly enlighten me what Tablet will go under SDR (I have a tuner) but I do not know if a specific tablet model is needed or a droid? some info quickly would come in handy because I'm going to buy.
Sory at the last minute.

The tablet is probably one stick, as long as it has a USB OTG, nom and it would be better if it had two cores for my eye, because with one core, the applications do not make, I mean SDT Touch and RF Analyzer

welcome back
I would like to ask again about the R820T2 version - are there any perceptible / noticeable differences from the previous version
I ask those who have already played with the newer version, without theorizing, I would ask
best regards :)

Added after 2 [minutes]:

Jezzman wrote:

The tablet is probably one stick, as long as it has a USB OTG, nom and it would be better if it had two cores for my eye, because with one core, the applications do not make, I mean SDT Touch and RF Analyzer

I would not be so sure, there are tablets that have OTG, and for example an external modem (eg HSDPA) will not support it.
I wonder how with SDR ...
I'm just sharing my thoughts - please don't lynch

Jezzman wrote:

The tablet is probably one stick, as long as it has a USB OTG, nom and it would be better if it had two cores for my eye, because with one core, the applications do not make, I mean SDT Touch and RF Analyzer

I would not be so sure, there are tablets that have OTG, and for example an external modem (eg HSDPA) will not support it.
I wonder how with SDR ...
I'm just sharing my thoughts - please don't lynch [/ quote]

If the tablet has USB OTG, SDR-A will definitely support it I have already tested several tuners on several tablets and phones with different android versions and they worked without any problems As for the HSDPA modem for usb, they will also handle it, but you need to know how to run them

In that case, I will not discuss any further (my theory versus your practice )
At one time I tried to run Huawei e173u-2 on my Toshiba Folio 100 with CM (Androszmelc 4.1.2) and despite many attempts it failed. Of course there was OTG. Maybe it was an isolated incident, maybe I didn't know everything then
PS. I have just read that people even run SDR on some Manta, so in the current tablets, even the cheap ones, it shouldn't be a bigger problem