SDR Question

Links for your SDR files
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kurt34ist
Posts: 15
Joined: 22 Aug 2015 23:11

SDR Question

Post by kurt34ist » 22 Aug 2015 23:25

Hi everybody,
I follow Skywaves for quite some time in Yahoogroups.
Today I registered on Skywaves and have a question:
Has anybody got experience with
HackRF One http://www.wimo.com/hackrf-sdr_d.html
and / or
Airspy http://airspy.com/
best regards from Istanbul
Kurt

Tim Bucknall
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Location: Congleton, often in the Peak District, sometimes in Poland or Kresy
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Re: SDR Question

Post by Tim Bucknall » 23 Aug 2015 10:58

Welcome Kurt
air spy yes, people on here have definitely used that so they will be able to comment, I don't know the other one
Home:Burkhardt Reuter RDR54D1 SDR V.415,
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daveB
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Re: SDR Question

Post by daveB » 23 Aug 2015 11:14

The HackRF datasheet says: "The AD converter works with 8 bit data width and thus reached a theoretical 48dB of dynamic range."

The dynamic range is low and is no beter than an RTL-dongle. The receiver is likely to suffer overloading.

The Airspy has 12bit AD so will be much better. It is a receiver

You should also look at the SDRPlay RSP receiver - it covers 100kHz to 2 GHz - it has a 12ibit AD and gives a dynamic range (theoretical) of 72dB. The SDRPlay has had a software update and now covers the whole frequency range without a gap. It has a lower price than the AirSpy. The maximum bandwidth is 7.2MHZ for 8 MHz sample rate

I have used an SDRPlay for 8 months - for FM-DXing and a small amount of listening on the amateur bands. It's very good - it is a lower price than the AirSpy. http://sdrplay.com/

Rgds

David
SDRPlay, AirSpyMini, RTL dongles, SB920s, Yamaha TX930. 5 ele compact yagi on rotator at 18ft agl. FM5 facing east, FM5 facing south, FM3 facing NE, OIRT dipole, 3-ele Moxon vertical facing east.

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pe1etr
Posts: 1108
Joined: 07 Oct 2014 00:40
Location: Blackpool UK

Re: SDR Question

Post by pe1etr » 23 Aug 2015 12:23

kurt34ist wrote:Hi everybody,
I follow Skywaves for quite some time in Yahoogroups.
Today I registered on Skywaves and have a question:
Has anybody got experience with
HackRF One http://www.wimo.com/hackrf-sdr_d.html
and / or
Airspy http://airspy.com/
best regards from Istanbul
Kurt
Hello Kurt,
If you want to use an SDR for FMDX in Istanbul, neither of those would be suitable. You will have massive overload. If you want to use an SDR for other VHF bands, you would need filters to reject 87.5 -108MHz. I have some Airspy IQ WAV files recorded close to a high power transmitter (Sutton Coldfield 250kW), and there is much overload. SDRplay is better at the same location.
There are youtube videos showing huge overload in HackRF from MW and FM Band 2.

Peter

kurt34ist
Posts: 15
Joined: 22 Aug 2015 23:11

Re: SDR Question

Post by kurt34ist » 23 Aug 2015 18:27

Thanks a lot for your replies.
I am looking for a new receiver for quite some time, but it is quite difficult to find something suitable here in Turkey.
Some years ago I got two USB TV sticks from Germany, but it turned out that they had the wrong chip and could not be used for SDR. Since then I gave up until some days ago I saw a report about the HackRF One on TV.
Ofcourse it is quite impossible here in Istanbul to do FM-DX with more than 100 transmitters on 200kHz spacing between 10 and 100 kW ERP just 7km away. But I want to listen to FM also while travelling by bus or stationary in other locations.
I have a simple and cheap solution for the rejection of band 2: I use a wall socket for radio and TV. The TV socket output has a very good FM suppression. Using this solution, I had no problems on the air band or OIRT.
I will try to get the SDRplay to be brought from Germany to Istanbul. I don't want it by mail, because I have to pick it up from customs (quite timeconsuming).
Thanks a lot for your assistance so far.
Best regards from Istanbul
Kurt

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Julian Hardstone
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Re: SDR Question

Post by Julian Hardstone » 24 Aug 2015 00:49

Kurt - It's a pity you could not make the USB TV Sticks work; I am told that all the TV Sticks should work if you use the correct drivers.

I can access a fine location for Band I and OIRT but cannot use a normal tuner as access is difficult and there's no power; I don't want to pay the high price for an SDR which wouldn't work because of all the drivers and faffing about and c**p. I tried to use a stick and my PC tells me the device type and I can download the "drivers" for it, and 10 or 20 files which are supposed to make it work, but nothing happens, and I don't know what to do with all the files and drivers. I took the laptop to the local computer man with the links to all the downloads but he did not succeed before he lost interest :evil:

Maybe Teamviewer is the answer, if we can find a kind person who understands these things

Tim Bucknall
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Joined: 01 Oct 2014 14:55
Location: Congleton, often in the Peak District, sometimes in Poland or Kresy
Contact:

Re: SDR Question

Post by Tim Bucknall » 25 Aug 2015 11:32

Air Spy use fake parts!

post from Jurgen

"Unbelieveable !!

Just came across this
http://airspy.com/index.php/forums/topi ... #post-1233
http://airspy.com/index.php/forums/topi ... #post-1248

So better check if you have a real one

As I also have that Airspy cable, I looked closer and the ferrite seems to be
from plastic, too. It is remarkable flexible!

I just held a magnet next to it and it gets slightly attracted, so there's a
bit ferrite in it. But ferrites on other USB cable get attracted much more."


well Julian, you can have a 2nd stick to not work soon :D
it worked as a cheap DAB/DTV rx on my vista laptops (now both dead) , but won't work at all on my windows 8 laptop

if you can't use it I was going to send to alex c, young people like complicated computer set ups :D
Home:Burkhardt Reuter RDR54D1 SDR V.415,
+ CLP 5130 Log P ant

Mobile: Comm Radio CR-1 + Sharman Skyscan ant, Pira P275

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