Category Archives: Tutorials

Oxford Shortwave Log: 200 metre Beverage antenna – initial reception tests

beverage3

Hi there, I have finally deployed the Medium Wave Circle-design 200 metre Beverage antenna (schematic diagram above) at the woods I use in Oxford, UK. It was terminated at the ‘front end’ with a 650 Ohm resistor into a 1 metre-long, permanent copper earthing rod that I had previously driven into the ground, away from the route taken by the general public. The actual wire was orientated in a generally westerly direction, and thus nulling signals propagating from the east. At the receiver end, I utillised my self-built transformer, wound for a 50 Ohm input impedance (14 turns on the primary), thus making the entire set-up suitable for the Elad FDM DUO. It was quite a pain to set up, taking over an hour to deploy the wire and connect both earthing rods and the transformer! However, intial results are very promising and here I am very pleased to share 3 reception videos with you:

The reception from Colombia and Ecuador was unprecidented and both of these tropical stations sound like local AM signals, aided of course by the Bose SoundLink Mini 2 (the Elad’s stand-alone audio is puny to say the least). The signal from Peru is weak, as would be expected, however, the low-gain/ high SNR performance of this antenna results in audio clarity that is better than I have ever heard previously from this rather exotic station. Further to these recordings, I managed to make two recordings of the entire MW band using the FDM DUO via the FDM-SW2 software and I’m hoping an analysis of the data will uncover some nice MW DX. Thus, all-in-all, a very good result with the 200 metre Beverage – more reception videos using this antenna to follow soon on my youtube channel Oxford Shortwave Log. Thanks for watching/ listening and I wish you all good DX.

Embedded reception videos with text links follow below:


 

 

 

Clint Gouveia is the author of this post and a regular contributor to the SWLing Post. Clint actively publishes videos of his shortwave radio excursions on his YouTube channel: Oxford Shortwave Log. Clint is based in Oxfordshire, England.

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Wi-Fi Radio Primer Part 1: Radio station aggregators and alternatives

I originally wrote this three-part WiFi radio primer and review series for the April, May and June issues of The Spectrum Monitor magazine.  Each part of this series will be posted with the tag: WiFi Radio Primer. I hope you enjoy Part 1 below:


The Grace Digital Mondo

I’ve always been a hard-core shortwave radio listener.  I like the tactile experience of turning the knobs of the shortwave, tuning in stations across the globe. So when online listening became popular, it never occurred to me to engage in this new, seemingly lesser sport; I put trying it on the back burner, and continued to enjoy my shortwave. After all, I rationalized, why listen to anything other than an actual radio?

Then, at the 2012 Winter SWL Fest, an excellent presentation on the merits and technologies behind Wi-Fi radio intrigued me. I found myself downloading and installing the Pro version of the TuneIn radio app. On the twelve-hour drive back home from the Fest, I tuned to local radio stations across the world via the TuneIn app. I had to admit, it was a pretty powerful listening experience…one I could easily get used to.

And get used to it, I did.  That’s when I realized that streaming radio stations over the Internet is, essentially, content DXing. For while there isn’t any particular skill required to listen to Internet radio, it offers convenient listening opportunities I wouldn’t otherwise have, and without the rigors of travel.  For example, from my home in the southeastern US, I can listen to a station in Perth, Australia––one local to that area and one that has never been, nor is likely to be, on shortwave. I found it frankly addictive.

uneIn's iPad app has a beautiful, simple user interface. If you purchase the TuneIn Pro version ($9.99 for the iPad) banner ads disappear.

TuneIn’s iPad app has a beautiful, simple user interface. If you purchase the TuneIn Pro version ($9.99 for the iPad) banner ads disappear.

Since 2012, I’ve relied on my TuneIn app and either a tablet or smartphone to listen to stations. I found I could hook up my tablet to a portable powered speaker, an SStran AM transmitter, or even a whole-house stereo, and enjoy music from all over the world.

There was only one problem, however: while they enjoyed the music, my busy family didn’t appreciate the complexity of my radio set-up. The truth is, it did require warming up a lot of equipment––most of which is in my shack––not to mention making sure connections were in place, logging in, launching apps, and then searching for stations.  One day, referencing the cobbler’s children (who, in the old adage, go without shoes), my wife asked in exasperation, “Isn’t there some way to make listening to music around here just a little more accessible to all of us?  Maybe something we could just turn on––?”

The Quest

Thus began my quest to purchase a dedicated Wi-Fi Radio, an Internet appliance with a singular purpose:  to play online radio stations from across the globe.  Simply. 

Fortunately, I reasoned, the process of choosing such a radio was likely to be just as simple.  I mean, how hard could it be?  I was already familiar enough with the wider radio landscape to know that these radios range from about $110 to $250 in price, and that they’re widely available from a number of radio and online retailers. Moreover, I’m lucky enough to count among my friends some of the most knowledgeable experts on the topic of Wi-Fi radio––Rob De Santos, Richard Cuff, and last but not least, John Figliozzi, author of the recently updated Worldwide Listening Guide––all of whom had jointly presented at that 2012 Fest that ignited my interest in WiFi radio. No doubt, I thought, a group-email to these experts would rapidly solve our dilemma.

Boy, was I ever wrong.

My expert friends all had excellent advice, but made me aware that there’s much more involved to choosing a WiFi radio than simply selecting the best-priced or the latest model. Firstly, they advised, it’s very important to identify a good station aggregator, and then select a good radio that relies upon it.

Radio Station Aggregators

WiFi radios are Internet appliances with the ability to stream Internet content, but they’re not endowed with the ability to seek out stations in the wild and import their audio streams. WiFi radios, I soon learned, rely on “aggregators,” or online databases of curated links to radio stations.

In the early days of WiFi radio, there were several models of radios on the market that linked to proprietary aggregators, many of which eventually closed down. When a WiFi radio loses its ability to link to an aggregator, it becomes no more than a pricey paperweight, especially if the WiFi radio doesn’t have traditional AM/FM reception as a backup.

The CC WiFi uses the popular Reciva aggregator.

The CC WiFi radio uses the popular Reciva aggregator.

So not only does an aggregator need to have some longevity, it also needs to be actively curated. This means having to staff actual human beings to help manage additions, deletions, and changes to the large database of broadcasters. This is necessary because radio stations and radio networks often change their streaming server address or format with very little notice. Good aggregators have methods that allow for broadcasters and listeners to submit such changes for approval so that streaming can be fully reestablished across the network of subscribing WiFi radios.

It should be noted as well that some aggregators may not support the protocol broadcasters choose to use for their streams. So, prior to purchasing a radio, buyers should attempt an Internet search to make sure their favorite broadcasters are listed among those offered by the radio’s aggregator. This being said, buyers must be aware that a number of aggregators require a username and password to search through their listings, thus limiting any pre-purchase search.

Types of Aggregators

Aggregators fall into two categories: those that are radio-dependent, and those that are not.

Radio-dependent aggregators are those that you can use only if you own a compatible device. For example, to stream from the Reciva system, you must first own a Reciva-connected WiFi radio. With your radio model/serial number in hand, you’ll be able to create a login on the Reciva system. From there, you can create lists of favorite stations and manage them.  If you don’t own a Reciva radio, however, you can’t log into the Reciva database. The same applies to Frontier Silicon (Sangean), as well as Pure.

The dominant open (or, non radio-dependent) aggregator on the market as of this publication is TuneIn Radio. TuneIn does not require a compliant device; you can create an account with TuneIn and stream from it via your computer, tablet, or smartphone. And of course, there are now radios that link to TuneIn as their aggregator.

VTuner is another open aggregator that can be explored prior to purchasing a compatible WiFi radio. Note that in this WiFi primer we will not explore the VTuner aggregator, however it will be covered in the upcoming review of the Como Audio Solo.

Following is a list of the most popular aggregators with a brief description of each.

Radio-dependent Aggregators

Reciva (https://radios.reciva.com/)

Reciva's station search function is more functional than that of Frontier Silicon. I can typically find a station by searching by call sign. When that doesn't work--as in this case when I searched for CKUT--I simply searched by city.

Reciva’s station search function is more functional than that of Frontier Silicon. I can typically find a station by searching by call sign. When that doesn’t work–as in this case when I searched for CKUT–I simply searched by city.

[Important Update: Reciva has announced that they are closing for business on April 30, 2021. Do not buy a new or used WiFi radio that relies on the Reciva aggregator as it will not function properly without the service.]

The Reciva aggregator has been around for many years. At one point, it was the most user-friendly and most actively curated aggregator on the market. Today, Reciva is still the most popular choice in a WiFi radio aggregator.

I find the Reciva website easy to use, even if its design and user-interface are slightly outdated. Reciva also seems to be relatively quick to respond to stream-server changes. When my favorite Internet radio station changed streaming servers last year, Reciva was quick to update the link. Reciva also allows you to build folders of favorite stations that make it easy for you to navigate with your radio. Moreover, Reciva has an advanced search function that also makes finding particular stations relatively easy.

Frontier Silicon (http://www.wifiradiofrontier.com/)

Frontier Silicon's website is clean, simple and responsive. Their "My Favourites" page makes organizing your many station memories an intuitive process.

Frontier Silicon’s website is clean, simple and responsive. Their “My Favourites” page makes organizing your many station memories an intuitive process.

As far as I can tell, Sangean is the only WiFi radio manufacturer using the Frontier Silicon aggregator. The Frontier Silicon interface is very basic, but gets the job done. Adding stations to a playlist also seems to be very straightforward.

With that said, however, if you chose the option of browsing stations by category––say, by language or genre––Frontier Silicon doesn’t allow you to search within the category’s results for specificity. For example, I recently wanted to search for new French language stations in a certain town in France. Once I had chosen the French language, then the country, I was presented with a list of over 1700 stations arranged alphabetically with twenty results per page, and with no way to search among them. It was frustratingly imprecise. Not only could I not find the town, but the station list was simply too broad, too unwieldy, to navigate.

Frontier Silicon’s database of information can be incomplete––and inconsistent.  Nonetheless, there are some tricks to help you find stations; for example, an online search by call sign and name may lead you to the desired result (then searching Frontier Silicon for other station keywords). A quick Internet search can also help you find regional broadcasters.

Frontier Silicon provides an easy means by which to submit new stations and provide updated information, should your station change server locations, but one must be patient. For example, I submitted a station’s updated URL to Frontier Silicon; it took them almost a week to update the stream, whereas Reciva took only a day or so to do the same.

All in all, the Frontier Silicon platform, though more bare-bones than its competitors, does the trick and seems to work quite well.

Pure (http://www.pure.com/) (Untested)

purelogoThe manufacturer, Pure, also has their own aggregator for their radio product line. Since I didn’t test a Pure WiFi radio for this review, I haven’t tried their system. I do have two friends that tout the virtues of Pure’s radios as well as Pure’s aggregator, claiming superb customer service and overall product quality.

As Pure is a “closed” ecosystem, I suppose there could be concerns about their products should the company ever close its doors.  But the company’s strong consumer following makes this relatively unlikely. One pleased user of my acquaintance claimed that Pure is to WiFi radio what Apple is to computers––in other words, it’s a company that provides a quality product, excellent design, as well as a user-friendly interface. I can’t speak to this comparison.  But I do know that, also like Apple, Pure’s products top the market in terms of price:  their Pure Evoke F4 (without extra speaker or battery) retails for $225 – 250 US. To put this in perspective, the priciest radio I reviewed was purchased for $170.  So, clearly, Pure’s products can double the cost of their competitor’s.

Open Aggregators

TuneIn (http://tunein.com)

You don't have to own a WiFi radio to begin organizing your favorite streaming broadcasters. Simply create a free account at TuneIn Radio (http://TuneIn.com), search for and organize your favorites and changes will propagate to all of your TuneIn connected devices and apps.

Create a free account at TuneIn Radio (http://TuneIn.com), search for/organize your favorites and changes will propagate to all of your TuneIn connected devices and apps.

I have been using the TuneIn system for at least four years. It is, without doubt, the most user-friendly database of radio stations I’ve tested. TuneIn’s search functionality is exceptionally powerful; I’ve found that I can almost always locate a station in a matter of seconds. And of course, you can hone in on a favorite station by region and genre.

The TuneIn search screen.

The TuneIn search screen.

The great thing about Tunein is that you don’t have to own an Internet device to use it. You can use a free account to organize your favorite stations, which will then propagate to the TuneIn app on your phone or tablet––as well as to your web browser, should you decide to listen on your computer.

Overall, the TuneIn user interface is pleasant and responsive; in short, it’s my favorite among the aggregators I tested.

Live365_logoLive365

Live 365––an aggregator with some history, which may very well have been in existence longer than any other––specializes in Internet stations rather than radio broadcasters who also happen to stream on the Internet.

[Update] Sadly, on February 1 st , 2016, Live365 closed for business. It is unlikely another company will pick up the reigns.

Why did Live365 close shop? Here’s what Forbes.com suggests:

“It is rumored that the service is being forced into early retirement because of new royalty rates that digital radio producers now need to adhere to. Late in 2015, the Copyright Royalty Board handed down its decision about what internet radio services will need to pay per stream, and it apparently hurt Live365 so much that it can no longer afford for the rights to play music.”

Among WiFi radios, Live 365 functions as an “add on” rather than sole default aggregator. If your radio has Live 365 functionality, the loss of service will have no effect on other radio functions.

Network-Specific Aggregators and services

iHeart-Radio-LogoiHeart Radio: iHeartRadio is an Internet radio platform owned by iHeartMedia, Inc. The iHeart radio app functions as both a radio network for the 800+ iHeart radio stations around the world and also as a music recommendation system. There are no WiFi radios that use iHeart as a default aggregator, but there are several that include iHeart as a featured app.

SiriusXM (paid): SiriusXM is a satellite radio subscription service; subscribers at a certain subscription level can also stream 130 channels over the Internet.

Music and other internet radio services

Spotify-LogoThere are a number of Internet radio services that are not curated.  Many of these services are adaptive platforms that create impromptu radio “stations” based on your preferences. These services may be included with a WiFi radio, but most are used in conjunction with smartphone apps, among them, Pandora, Slacker, LastFM, Spotify, and Aupeo. Note these services are outside the scope of this review for the simple reason that, as a content DXer, my interest is on actual radio stations rather than music services.

A final note about aggregators

There are likely other aggregators and services in existence that I’ve omitted from this review. Again, I focused on the better-known aggregators and services, most of which are considered relatively stable and well-supported by both manufacturers and WiFi radio enthusiasts.

In conclusion, I’ll say once more:  it’s important to check whether a particular aggregator supports your favorite radio station(s) and broadcast network(s) prior to purchasing the adjunct radio. And if it doesn’t, you need not necessarily rule out the system altogether; often an aggregator will have the capability to add the preferred station(s), so this is also worth investigating. The obvious exceptions are stations using streaming formats not supported by your radio or your aggregator (or both). In short, do check before you buy.

I’ve been testing WiFi radios supported by Reciva, Frontier Silicon, and TuneIn, and can say that I haven’t been displeased with any of them. All seem to support my favorite stations and networks.

Alternatives to WiFi radios

The Roku 3

The Roku 3

Before we look at the WiFi radios on the market in Part 2 and 3 of this feature––coming up in the coming weeks––I should note that there are certainly cheaper alternatives to a dedicated WiFi Radio, especially if you already own a device that can play Internet radio content. By and large, smartphones, tablets, as well as PCs offer the most convenient access to online broadcast streaming, though even some TVs and video streaming devices (Roku, AppleTV, Amazon’s Fire TV Stick, Google’s Chromecast, and so forth) contain basic audio streaming apps.

Smartphones

Since the majority of us have a smartphone or tablet, you’ll find this provides a convenient and readily accessible means by which to enjoy the functionality of a portable WiFi radio.  If you haven’t already done so, the process couldn’t be easier:  simply download the TuneIn app (Android: http://bit.ly/1gB1DAh and iOS: http://apple.co/1O9aZxI).

Though TuneIn offers a monthly premium plan (primarily for those who want coverage of sporting events), even the free plan unlocks the full database of radio stations across the globe.

With the app installed, you can plug in headphones and tune in thousands of stations. If you want improved audio, simply plug in an external amplified speaker, or connect a speaker via BlueTooth.

iPodTouch-TuneIn

The app is lightweight and doesn’t rob you of much of your device’s resources. And of course, it can play in the background as you do other things.  As a bonus, TuneIn can stream thousands of podcasts––including those from the Shortwave Radio Audio Archive. There’s a curious pleasure in riding a train or subway while listening to an archived off-air recording of Radio Moscow from the 1970s!

While we’re talking about apps, there’s also an excellent one written by shortwave listener, Steven Clift, called the 1 Radio News app. At the moment, it’s only available for Android devices. There’s also a free version with some banner ads and a Pro version ($.99) with no ads and more stations.

WiFi radio?  We’re hooked

For many––myself included––this was my WiFI set-up for many years:  a smartphone and headphones, plus a tablet hooked up to a powered portable speaker. I never felt the need to have a dedicated Internet appliance for tuning radios stations…until, that is, my family needed something more, launching this investigation into the world of WiFi radio.

Now, having experienced the benefits of dedicated WiFi radio, I don’t think I’d choose to be without one. It’s just incredibly convenient to tune in a station on a simple device which has as its sole purpose streaming audio. All of the units I reviewed have excellent audio via the internal speaker, too.

Best yet, I’ve now found a radio that my entire family––yes, even my wife––enjoys. With the touch of a button or a voice command, they now tune to favorite stations in Brazil, Africa, Europe, or Canada.  And our house is now full of their music choices, too.

Coming up in the next two issues: Parts 2 and 3 which include reviews of four popular WiFi radios.

I will post each part of this three part series with the tag: WiFi Radio Primer.

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Video: Yaesu FT-1000MP Repair

Yesu-FT1000MP-Reapir

Remember Mr. Carlson’s excellent video of the Sony CRF-320 restoration? Many thanks to SWLing Post contributor, Ken McKenzie, who shares a link to the latest Mr. Carlson video–a Yaesu FT-1000MP repair:

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Guest Post: Tracking High Seas Pirates on Shortwave Radio

Suspected pirates surrender to crew members of the CGC Boutwell. (U.S. Coast Guard photo)

Suspected pirates surrender to crew members of the CGC Boutwell. (U.S. Coast Guard photo)

Many thanks to SWLing Post contributor, Mario Filippi (N2HUN) for the following guest post:


Tracking High Seas Pirates on Shortwave Radio

by Mario Filippi (N2HUN)

(All photos taken by author–click to enlarge)

Ahoy! After spinning a radio dial for over a half-century, shortwave listening still provides a source of adventure and interesting intercepts. While major broadcasters continue to move to the Internet and dwindle in number, there nonetheless remains plenty of utility intrigue to be had; you just need to know where to look, and be comfortable with other modes of communication such as RTTY (Radioteletype).

RTTY remains on HF (3 – 30 MHz), albeit mostly encrypted, but there are some stalwarts of this mode that transmit important and interesting information for ships at sea. The information can take the form of weather broadcasts, hazards to navigation, information on ships lost at sea, and pirate activity. Yes, pirate activity but not radio pirates; real honest-to-goodness modern day pirates looking to loot, plunder and prey upon commercial ships making an honest living or other leisure watercraft just out having fun.

SignaLink-AOR

Who knows what dangers lurk behind that dial? Trusty AOR AR-3000 receiver and SignaLink™.

Has your interest been piqued? When avast mateys as I spin ya’ a yarn on how to find out where these sea-faring scoundrels lurk from the Caribbean all the way to the South China sea!

Pirate activity is not something of the past; it exists today and is a threat conducted by ragtag armed ragamuffin groups. To keep abreast of the action you’ll need the following gear: a shortwave radio with single sideband (SSB), a decent antenna, a means of decoding RTTY, and WLO, a station from Mobile, AL that transmits information to ships at sea.

You’ll do well to add WLO’s frequency to your receiver’s memory list as it’s a pretty active station that faithfully serves the sea-faring community and is one of the gems on HF.

First, tune your receiver using USB (Upper Side Band) to around 8.472 MHz and listen for that warbling sound. You will also need a way to pipe the audio from your shortwave receiver to a computer (I use a SignaLink™ USB) and a decoding program for RTTY, such as MMTTY.

To decode you’ll need to set the baud rate (45.45) and shift (170 Hz) on MTTY (or software program of choice) and tune your radio slightly up and down frequency until the software starts decoding.

You may have to press the “Reverse” or “Rev” selector at times. MMTTY is my favorite for RTTY decoding, and a picture of it is below.

WLO, Mobile AL, with RYRY idling loop, MMTTY decoder, 45.45 bauds, 170Hz shift, “Rev.”

WLO, Mobile AL, with RYRY idling loop, MMTTY decoder, 45.45 bauds, 170Hz shift, “Rev.”

MMTTY is available as a free download from Makato Mori, JE3HHT. I’ve used his program for over a decade and it performs well.

You can also use MultiPSK or FLdigi to decode RTTY so it’s the user’s choice as to which is a better fit.

Anyway, what are these pirates up to? Well the next few screenshots (click to enlarge) show some interesting activity as per WLO’s RTTY transmissions:

Pirates use element of surprise with guns and knives as armaments.

Pirates use element of surprise with guns and knives as armaments.

Somali pirates reportedly armed with automatic weapons and rocket-propelled grenades. Yikes!

Somali pirates reportedly armed with automatic weapons and rocket-propelled grenades. Yikes!

pic5

Give ‘em hell boys! An alert bulk carrier crew aborted hijacking with teamwork and water cannon.

Ships are encouraged to report pirate activity via FAX or phone.

Ships are encouraged to report pirate activity via FAX or phone.

Well mateys that’s enough high seas adventure for now, so first shove off to the galley for some grub (or grog) and then head to the radio room, turn on that rig and get ready for action on HF, you’ll find plenty to choose from, it’s out there for you.

I would like to thank the operators of WLO for providing such a valuable service to mariners and for providing us radio aficionados with interesting reception! And thanks readers!

P.S. Note that WLO alternates from RTTY to Sitor B so just make sure you are listening to the RTTY broadcast. If the transmission is in Sitor B then you can use a NAVTEX (e.g. YAND) decoder instead.


Thank you so much, Mario, for sharing yet another fascinating aspect of our radio world! FYI: I’m planning on purchasing a SignaLink USB at the Dayton Hamvention this year.

Readers, you can read all of Mario’s posts by clicking or bookmarking this link.

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Simple modification to disable soft mute on the Tecsun PL-210

pl210_mod4

Many thanks to SWLing reader, Mini, who wites:

I am Japanese short wave listener.

I found the method that disable soft-mute of TECSUN PL-210.
And, I posted the article in my blog.

pl210_mod1

Please forgive me that may be difficult for you to understand the content.
It is automatic translation from Japanese my blog.

Thanks mini

Click here to read Mini’s blog post via Google translate.

Click here for the original in Japanese.

Thank you, Mini! I don’t have the PL-210, but if I did I would certainly disable the soft mute as I find it very distracting during routine band scans.

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Mike’s overview and review of the $40 Soft66RTL3 SDR by Kazunori Miura (JA7TDO)

RTL3

Many thanks to SWLing Post contributor, Mike Ladd, for the following guest post and overview of setting up and using the Soft66RTL3 SDR:


Soft66RTL3 SDR: A low cost…Good performer direct from Japan

by Mike Ladd

Much has changed in the last 8 years in the world of SDR radios. Fast forward to 2016 and just about everyone in the hobby has heard the buzz word “SDR radio”. When SDRs first came out to the market they were all aimed at HF listening and you had two types to pick from. The first being soundcard based and the second being direct sampling. The price gap between the two were several hundred dollars. The more expensive being direct sampling. As the hobby progressed, so did the technology and the prices started to shift dramatically.

You can now purchase a TV dongle for $10.00 and turn it into a SDR. The Soft66RTL3 is basically a TV dongle but with a lot more features.

The Soft66RTL3 comes from an engineer who is no stranger to the world of SDRS. Kazunori Miura (JA7TDO) has been designing and selling many models of SDRS over the internet and shipping them direct from Japan for about 7 years. The Soft66RTL3 is his latest of model hot off his bench. This SDR is a dual input RTL-SDR with a built in 50 MHz upconverter along with 4 user selectable band pass filters that greatly increase your signal to noise ratio in the HF bands.

Soft66RTL3-board-001 Soft66RTL3-Board 2 Soft66RTL3-board

The frequency range of the RTL3 is from DC to Daylight (0.4 kHz to 1.7 GHz). Miura also addressed a heat issue with the previous version (RTL2) by adding a thermal pad and heatsink. RTL dongles are notoriously unstable due to overheating. In theory, the thermal pad should add frequency stability and keep drift to a minimal.

RTL3-TrimmerPot

The last feature of the RTL3 is the input gain trimmer pot (see image above). The trimmer pot is for the HF side of the SDR and is already set before it’s shipped from Japan. If you would like to reduce or increase it the trimmer pot is easily accessible. I would suggest leaving it as is.

The RTL3 is broken down into two sections: the HF input side and the VHF/UHF input side.

Soft66RTL3-encoder

The HF side of the SDR (above) has a red rotary encoder and trimmer pot port. The VHF/UHF side (below) has the USB Mini-B connection.

Soft66RTL3-back

Both sides of the RTL3 terminate to a SMA-Male connection and Power comes from a single USB Mini-B cable.

Soft66RTL3-BandPassFilter

Band pass filter selection

If you look at the rotary encoder (red cap cover) you will see a small notch window. The 12 o’clock position is #5 on the encoder dial. One click clockwise will take you to switch position #6 and one click counterclockwise will take you to #4. You should pull the red cap cover off to have a look and get your bearings.

The band pass filter selection is as follows:

  • #4 enables BPF 0.4 to 1.2MHz
  • #5 enables BPF 1.2MHz to 5MHz
  • #6 enables BPF 5MHz to 15MHz
  • #7 enables BPF 15MHz to 30MHz
  • #8 or #9 enables the VHF UHF side of the SDR

All other positions will bypass the filtering section on the HF side of the SDR.

Installation

If you already have a RTL-SDR on your system then all you need to do is swap it out with the RTL3 and change the offset of -50,000,000 in HDSDR or SDR# to listen to the HF side of the RTL3–but if this is your first SDR we will need to install 2 items: the front end app and the driver.

I will assume your system is Win-7 or better and we will be using SDR# as our program of choice to drive the RTL3. The RTL3 runs just fine in HDSDR and SDR-Console, but by choosing SDR# it will reduce our setup time considerably.

ScreenShot-SDR

  1. Plug in the RTL3
  2. Make a folder on your desktop and name it SDR#
  3. Download the latest version SDR# from www.airspy.com and copy the contents of the zip file to your newly created SDR# folder
  4. Inside of your SDR# folder, double click on install-rtlsdr
  5. After the batch completes, double click on the “zadig.exe” inside your SDR# folder

screengrab

When you run the “zadig.exe” make sure you select “list all devices” as shown above.

ScreenGrab-Window

The next 3 steps are:

  1. Select “Bulk-In Interface” (Interface 0)
  2. Make sure the proper USB device is selected (2838)
  3. Click “install driver”

The RTL3 is now ready to be used and no further setup is required.

For a more detailed installation I would visit RTL-SDR.COM for a complete setup instructions: http://www.rtl-sdr.com/rtl-sdr-quick-start-guide

I will assume you did not have any issues setting up the ZADIG driver and now move on to using the RTL3 inside of SDR#. I will show you real world conditions that are not from any scientific standpoint.

Antenna wise, for the HF side I will be using a G5RV mini and for the VHF/UHF side I will be using a Scanntenna ST-2.

You can now launch SDR# and check the following settings (see image below).

SDRSharp-Settings

For the VHF/UHF side of the RTL3 you will want the rotary encoder on position #9. You want the cutout in the encoder cap showing the 5 o’clock position.

Summary

I have been using this SDR for a little over 3 months. Out of all the low cost SDR’S on the market, this one gives you the most bang-for-your-buck and it is a great entry level SDR with some “Pro” features.

Pros:

  • Low Price
  • HF VHF/UHF in one package
  • Works with any app that supports the RTL-SDR front end
  • 4 user selectable band pass filters for HF
  • Highly sensitive user controlled input RF amp
  • Small & very compact metal case
  • Dual input SMA jacks
  • ESD protection diode

Cons

  • Some intermod in the 460-470 MHz range
  • Inputs are on opposite sides of the SDR body

The Soft66RTL3 price is $40.00 US shipped–click here to order.


Mike, thank you so much for this excellent overview of the Soft66RTL3!  I’m especially appreciative of the time you’ve taken to explain the installation process–for many, this is one of the more difficult RTL-SDR learning curves.

I’m very tempted to check this out for myself–I love the fact that this little SDR has bandpass filters.

Post Readers: I suspect Mike will monitor the comments in this post, so feel free to ask questions. Make sure to check out Mike’s website, where you’ll find more articles about software defined radios.

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Guest Post: Building a magnetic loop antenna & broadband amplifier for your SDR

Many thanks to SWLing Post contributor, Dave Gahimer (K9ZCE) for the following guest post:


Loop-Antenna

Small Magnetic Loop Antenna with Broadband Amplifier for SDR Reception

by Dave Gahimer (K9ZCE)

Those with limited space, or antenna restrictions, might find a small 1 meter loop antenna a solution.

My son lives in an apartment. One Loop leaning against a wall gives him acceptable reception with the SDRPlay RSP on the ground floor–2nd or 3rd level flats should have very good reception.

Ten meters off the ground outside should give reception equal to any SWL antenna. We all with SDRs fight the image problem. Normal resonate ham band antennas show too strong reception of unwanted bands/stations. Did I mention noise? Loops are well known for –6 db noise reduction.

Then there is the possibility of SDR chip damage from your 1.5 KW station! In researching Loops we came across LZ1AQ. A Brilliant design /engineer (http://www.lz1aq.signacor.com/). Deep reading sometimes, but a great understanding of what makes a good receiving loop antenna.

Those who chase DX know that sometimes fading is caused by the signals’ polarization changing in the Ionosphere. Having both vertical and horizontal loops, and the ability to combine both signals diminishes this fading problem. Being able to filter the powerful, commercial FM transmitters diminishes image problems. Clipping strong signals at the antenna from very near powerful antennas/transmitters could save the SDR receiver from damage.

The LZ1AQ broad band Amp solves all these problems. http://active-antenna.eu/amplifier-kit/.

My son Ted and I built three, one meter loops from soft ½ inch copper plumbing tubing. One for his apartment, two for my crossed loops antenna. We weather proofed the Copper from corrosion by coating with outdoor clear spar varnish. We shaped the circle by drawing the tubing around a round glass top patio table.

The soft copper loop in held by white PCV plastic plumbing pipe. 1” or 1.25 inch schedule 40. Be careful to check that the PVC is schedule 40, thick wall. The thin wall pipe is not strong in the wind and will crack when you try to drill it.

Drill up to a 3/8 hole for the ½” copper tube to go through, then file out to fit. Here are some photos (click to enlarge):

crossed loops up 3 crossed loops up 4

Check out these links (all courtesy of LZ1AQ) to acquaint yourself with the loop construction and amplifier installation:

http://active-antenna.eu/tech-docs/2_ActiveAA_Mount_20.pdf

http://active-antenna.eu/tech-docs/1_ActiveAA_DandS_20.pdf

http://active-antenna.eu/tech-docs/3_ActiveAA_Antena_11.pdf

Many SDR receiver owners have seen improved noise and Image reduction by placing the plastic cased SDR unit on a small shielded/ grounded case.

crossed loops up 5

The Amp needs 12VDC from in the shack. The Amp has two relays that you can switch, from in the shack, to select Vertical or Horizontal loops, or a dipole. The loop amp connects back to the shack via a shielded Cat 5 cable, Make sure you get shielded CAT 5 to reduce noise pickup. Make sure you provide an adequate good Ground below the antenna, less noise pickup and lightening protection.

crossed loops up

Have fun!
Dave, K9ZCE
Retired from EE Dept @ Rose-Hulman Institute of Technology
Terre Haute, Indiana


Thank you so much, Dave!

Readers: yesterday I saw Dave’s loop antenna photos on the SDRplay RSP Facebook page. I was fascinated by his horizontally/vertically oriented loops and asked if he would write up a short guest post.  He kindly obliged in a matter of hours!

If you have an antenna project you’d like to share, please contact me. So many SWLs and ham radio operators live in areas with restrictions and pervasive RFI–projects like Dave’s can revive one’s radio life!

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