Clint spends much of the year travelling the world and uses the opportunity to hunt Medium wave DX signals. He also writes articles for magazines including Radio User here in the UK.
Take a look at these recordings he made from here in the UK:
Over on Youtube, Rob aka “SevenFortyOne” has released a very nice video talking through some of the features of the RSPdx which will be on sale later in November 2019. He includes some demonstrations of it in action, picking up some longwave broadcast stations from across the Atlantic:
Youtuber Mile, Z33T has one of the few advanced samples of the new RSP2pro replacement – the RSPdx which will begin shipping later in November 2019.
He writes “Today I have received the new SDR receiver from SDRplay: the RSPdx, and was eager to turn it on and do some tests receiving on HF and VLF. Although at the moment my mini-whip antenna is not operational, I have connected some 20 meters wire as an antenna and start listening on VLF, LW, MW and HF… I have to say that SDRplay team did a good job with this SDR-receiver, putting better filters and redesigning front-end to improve dynamic range and enhance overall performance in relation to its predecessors RSP2 and RSP2pro. The new RSPdx is very good indeed. Especially on HF and below.”
Over on the SDRplay forum, Paul NN4F shares his results where he compares the LF (Longwave) performance of the RSPdx with a number of popular SDRs.
“Ok as some of you may know, I started the facebook group for SDRPlay as an unofficial group, then I started working for ELAD, but I continued to be a tester for SDRPlay, over the past few years, I’ve managed to gather a small collection of SDR’s , all the SDRPlay Range from the 1 to the latest RSPdx, and obviously all the ELAD Radios, well I do work for them… 🙂 and a few more, including the revered Perseus.
Last night the LW signals work amazing here, so I decided to do a comparison test, trying not to be biased towards Elad, but they are in a different price range, the next step up from SDRPlay SDR’s My Location is just outside of Charleston, SC in the USA, and the target station was Medi1 out of Morocco on 171kHz
All signals just above the noise floor,
Perseus Just about see the signal, audio is just about readable,
Airspy HF+ barely see the signal, can tell audio is there but can’t make it out.
LimeSDR hmmm joke waste of my money
Elad S2 just about hear and see the station, readable
RSP1a just about hear and see, just about readable almost as good as the Perseus
RSPDuo Similar to RSP1a
RSP2Pro worse than 1a to be expected I guess
RSPdx good signal and almost perfectly readable
Elad S3 just a wee tad better than the RSPdx, clear audio ($800 more)
Elad DuoR using SW2 about on par with RSPdx ($700 more)
Using 120ft longwire via a 9:1 grounded, couldn’t compare S3 in Uno as extio’s are not available yet (Radio isn’t publicly available yet)…all tested at about 500khz Bandwidth or as close to. I do have better antennas but this was the setup at the time
RSPdx was in HDR mode LW button, then improved signal by using LIF 1.536mhz at 16 decimation 200khz and it was that was closest to Elad-S3 and better than the RSPDuo
All with noise floor around s5, signal showing around s6-8
So in order of best to worst
Elad-S3, RSPdx, Elad DuoR, Elad-S2(add-on filters not used), Perseus, (RSP1a, RSPDuo Both about same) Elad-S1, Airspy HF+, RSP1, LimeSDR
This isn’t a LAB grade test, it was made using the MK1 Brain, Eyes and Ears, We could go into details, but whats 0.1 of a dB between friends…..and if you can’t hear the station, what’s the point of all the noise figures…
Pic is the RSPdx using latest 1.33 SDRUno using HDR mode on Antenna C”
Over on the Tech Minds YouTube channel, Matt reviews the RSPdx:
Here is a neat demonstration of how well the RSPdx was working during the recent CQWW contest with an amateur station in eastern Canada being well received in the UK. It also shows the power of having a visual representation of the activity during a contest:
In the coming weeks, links to more demos and articles relating the RSPdx will be added to our apps and support catalogue: https://www.sdrplay.com/apps-catalogue/
The current schedule is for RSPdx units to be available from around 22nd November – either direct from this website (click on purchase) or from our authorised channel partners and resellers: https://www.sdrplay.com/distributors/
Andrew Barron, author of the very popular book “Software Defined Radio” has written a new review of the RSP1A and SDRuno:
Click on the picture above to read his review. In it he says: “…the RSP1A has several notable improvements especially the front end and broadcast band notch filters. The new release of SDRuno is a huge improvement over the earlier versions. I like that you can click a band button and see the whole band and it has many features that are not included in other software such as Stereo FM with RDS, Tmate, CAT, and OmniRig control. The RSP1A is excellent value for money and probably the best wideband SDR on the market.”
Andrew’s book “Software Defined Radio” can be purchased from the RSGB at: http://www.rsgbshop.org/acatalog/Online_Catalogue_What_s_New_26.html
This YouTube video by Tim Stoddard is a compelling demonstration of how diversity tuning of an SDRplay RSPduo can dramatically reduce the effects of local interference:
There are 2 very practical applications for diversity software. The first is MRC (Maximum Ratio Combination) Diversity which, in order to be effective, needs two antennas presenting the same signal with some degree of diversity. Examples of diversity are:
Spatial Diversity: Using two antennas that are physically separated from one another. Depending upon the expected incidence of the incoming signal, sometimes a space on the order of a wavelength is sufficient. Other times much larger distances are needed – this can be challenging for HF frequencies and below.
Pattern Diversity: Using co-located antennas with different radiation patterns. This type of diversity makes use of directional antennas that are usually physically separated by some (often short) distance. Collectively they are capable of discriminating a large portion of angle space and can provide a higher gain versus a single omnidirectional radiator.
Polarization Diversity: Combining a pair of antennas with orthogonal polarisations. Reflected signals can undergo polarization changes depending on the medium through which they are traveling. A polarization difference of 90° will result in an attenuation factor of up to 34 dB in signal strength. By pairing two complementary polarizations, this scheme can immunize a system from polarization mismatches that would otherwise cause signal fade.
The key thing it to experiment and once you provide some degree of diversity as described above. The “APPLY AUTO” button in SDRuno will select the optimum combination of amplitude and phase to give you an enhanced signal versus either one of the individual signals.
The second application is for local noise cancellation. Here you are using manual control of the phase and amplitude to subtract the unwanted interference from the wanted signal. This is becoming extremely relevant as the sources of electrical interference from power supplies, LED lighting etc proliferate. This is what is demonstrated by Tim Stoddard’s video above. There’s also an SDRplay video explaining more about this if you click here: https://youtu.be/x1DRgprcC6g
There has been a flurry of great new reviews popping up in the past few weeks.
Here is a selection:
Aviation Blogger, “MerseyRadar” reviews the RSP1A and is very complimentary with comments like “SDRuno development is constant and when the new features arrive they are very well executed.”……… “Value..The best out there given what you get for your cash.” and “Designed and manufactured right here in the United Kingdom and sold all over the world..Yes we still make very good quality items right here in GB!”
He expands further:
“The SDRPlay RSP1A really is a revelation in SDR radio to have a “HF/VHF/UHF right up to microwave in one box, and best of all the cost is just circa £90 in the UK or $120usd in the US.
The performance out of this thing is nothing short of amazing.
Thinking about taking the plunge into the world of SDR radio or a serious upgrade/substitute for your RTL dongle ?
If you are an airband fan civil or mil ,The RSP1A will not disappoint.
Think about it, the RSP1A retails at less than the cost of the very popular and highly rated Uniden UBC-125XLT “pocket rocket” scanner and significantly less than a Uniden BCT-15X or Whistler WS-1065 base station scanner.
In fact instead of buying a BCT-15X/WS-1065 base station , you could buy an RSP1A to use as an all band/all mode base station listening post plus a UBC-125XLT for airfield spotting trips and still have a good amount of change to put in the funds pot for that new antenna !
Strange but true !
It seems as though SDRPlay have squeezed just about everything on the wish list for the aviation enthusiast listener into this box of electronics and kept the price very affordable. The RSP1A has set the bar very high indeed when it comes to value for money.
At this price point, nothing even comes close. Insane value when you think about it.
I can thoroughly recommend the RSP1A from SDRPlay, it is everything an aviation enthusiast listener could ever want in a base station radio, and some !”
Read the full review here: http://www.merseyradar.co.uk/airband-radio/sdrplay-rsp1a-review/
In this detailed video, TomTekTest demonstrates the impressive low noise performance and sensitivity of the Steve Andrew Spectrum Analyser software
Dave Zantow (N9EWO), writes: “Our greatly “Updated” SDRplay RSP1A review is now available (with new number two 2019 manufactured test sample).As usual with our web pages be sure and have pop up blocker on full (allow no pop ups) and browser security settings at default or above.” Click here to read it: http://n9ewo.angelfire.com/sdrplay.html
Richard Lacroix reviews the RSPduo and puts it head-to-head with his Harris RF-590 and Rockwell Collins HF. He also compares the RSPduo performance to the ICOM IC-R8500 in the LOS SATCOM band.
Read the review here: http://www.milspec.ca/sdr/sdr.html
YouTuber SevenFortyOne just added an update to his ever popular series of review guides to show the very latest version of the SDRuno Scanning software V1.31:
Our thanks to the many YouTubers who regularly review and post tutorials on using the features of SDRuno. The latest to post a very clear step-by-step walk-through of the new scanning feature, is SevenFortyOne, who also shows how useful it can be for checking HF frequencies for activity: