SDRplay RSP2

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pe1etr
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Location: Kalar, Kurdistan (Iraq)

SDRplay RSP2

Post by pe1etr » 25 Nov 2016 12:53

Released three days ago but I only just saw the news.

Some reviews are out

http://www.hamradioscience.com/sdrplay-rsp2-review/

http://www.rtl-sdr.com/
has all the specs etc...scroll down the page.
Peter

Blackpool

sleeper77
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Re: SDRplay RSP2

Post by sleeper77 » 21 Dec 2016 19:14

I want to add I have got one. In fact, this is my second one as the first seemed to have an issue with the Bias-T not working with my Patch Antenna. I will find out tonight if my second unit will work or maybe it is a general issue that the SDR Play team need to know about. The Patch Antenna works fine though with the Airspy R2 when the Bias-T is on.

I tried it on the LF band last night connected to my Wellbrook. For the price I am impressed I could get China, Ukraine & Armenia on MW, but there was an issue of overload though. It was a strange one because one moment the images were there & the next they were not despite the attenuation being the same. I think it could be more to do with SDR Uno: I find too hit & miss for my liking. There should be an Extio file soon for the SDRPlay 2 to work with SDR Console as I find the latter a lot better to use.

Also I can do a more fair comparison with my Elad FDM-S2 using the same SDR software. I tried to do a video yesterday, but I think the differences in reception & sound are more to do with SDR Uno rather than the SDR Play itself. An example was receiving a weak signal on 1512 kHz, both the Elad & RSP2 saw it but on the Elad (using FDM-SW2) it sounded better so I think this is more of another software issue. I can say that on SDR Uno, when in AM mode it sounds noisy but on SYNC AM it was much better & cleaner. I know SYNC AM can make all the difference, but it should not have sounded so rough on AM mode.

I also tried Band 2 & it could manage to get the weaker stations at my QTH from LOndon & northern France. I did not do a comparison with the Elad, but when I get more time I will upload a video as well for other bands.

So upto now it has left me with a good impression for the price but the sooner the Extio is done, the better because SDR Uno does not cut it for me.

sleeper77
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Re: SDRplay RSP2

Post by sleeper77 » 22 Dec 2016 20:35

I have done some further tests on the MW band. SDR Uno can see weak signals with the RSP2, but it cannot hear them properly. The Elad with the FDM-SW2 program can. I will try to do another test where the Elad is using SDR Uno rather than FDM-SW2 to see what is at fault, the SDRs or the programs.

Here is a video of me getting what are considered some DX catches on the MW band with the RSP2 using the Wellbrook antenna...

https://www.youtube.com/watch?v=204FfDfofco

sleeper77
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Re: SDRplay RSP2

Post by sleeper77 » 24 Dec 2016 16:19

A comparison of the SDRPlay 2 on MW...

https://www.youtube.com/watch?v=n4ILMA7HR44

And also on SW...

https://www.youtube.com/watch?v=50PfR8rst6M

sleeper77
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Re: SDRplay RSP2

Post by sleeper77 » 26 Dec 2016 15:01

Ok, I deleted the original MW comparison I did & uploaded another. I was told by the SDRPlay author that I had the tune & LO frequency the same causing distortion with the RSP2, hence no sound.

https://www.youtube.com/watch?v=WqDJo-jpDSs

sleeper77
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Re: SDRplay RSP2

Post by sleeper77 » 06 Jan 2017 16:52

I was using the RSP2 to try & do some TA DXing the other night, which there were only a couple of the usuals (Anguilla 1610 kHz & Puerto Rico 1660 kHz). Both the RSP2 & Elad FDM-S2 received these stations with similar reception. The only difference was that I found images from a local Smooth Radio relay on 1558 kHz with the RSP2, the Elad had no issues. One image was on approximately 1620 kHz & the other around 1665 kHz. Putting the gain down to a minimum did not help either, the images were still there. Maybe an additional bandpass filter may have helped to further minimise this.

daveB
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Re: SDRplay RSP2

Post by daveB » 10 Jan 2017 12:40

[quote]I found images from a local Smooth Radio relay on 1558 kHz with the RSP2[/quote}

Did you try turning off the internal LNA and then playing with the IF Gain? With the high gain pre-amp of the Wellbrook you may be getting some mixer overload.

It is something I notice on the RSP! on FM when using a 20dB external pre-amp. It doesn't show as a big rise in the noise floor but as weak spurii - easy to see at the band edges. In this case turning the LNA block off removed all the spurii but there was drop in sensitivity as the external preamp had compensated. Without an external preamp on FM the LNA makes all the difference.

Not owning an RSP2 and with no block schematic I presume the general architecture is the same - that there is a pre-amp for 60MHz and above that is in front of the internal LNA of the mirics tuner chip.
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.

sleeper77
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Re: SDRplay RSP2

Post by sleeper77 » 23 Jan 2017 20:19

I will try again, although I am sure the LNA was off & I minimized the RF gain.

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Patrick73
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Re: SDRplay RSP2

Post by Patrick73 » 27 Jan 2017 13:28

Assuming some people claimed the S2 was somehow 'deaf', an A/B vs the ELAD on a weak FM band 2 signal would also be of interest ... If you have some spare time for this !!! I wonder if the RSP would also suffer from images there.
Did you manage to get rid of those ghost signal on MW ?

As I'm interested in purchasing a unit, your comments and videos very useful. Thanks !
Patrick
Main interests : NDB, MW & FM DX'ing
REU Editor http://www.classaxe.com/dx/ndb/reu

sleeper77
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Re: SDRplay RSP2

Post by sleeper77 » 14 Feb 2017 20:34

Hello Patrick.

Sorry for the late reply.

I have yet to try out the MW test again on the RSP2. But for FM, I found it very sensitive although it did have a few images.
If I was to make a quick conclusion, if you have an Elad then there is no need for a RSP2. I would only recommend one if the Elad is too expensive & want similar sensitivity at the cost of a few images + overload.

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