Tag Archives: Mario Filippi (N2HUN)

How to decode maritime broadcasts in RTTY, Sitor B, and NAVTEX

(Photo Credit: NOAA)

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

Maritime Broadcasts in RTTY, Sitor B, and NAVTEX.

By Mario Filippi, N2HUN

(All photos below are courtesy of the author. Click each image to enlarge.)

Non-voice high seas weather broadcasts and safety messages to mariners can be found by spinning your VFO dial to 8.472 MHz USB courtesy of WLO from Mobile, AL, which provides these transmissions continuously. Here on the East Coast it is received with regularity due to it’s strong signal.

Those of you who are neophytes to RTTY or just want to dabble then this is the place to be to try your hand at an old and venerable digital mode. The RTTY (RadioTeleTYpe) parameters used by WLO transmissions are 45.45 bauds, 170Hz shift. These are most commonly used by amateur radio ops too. If you’ve roamed the bands for RTTY signals you’ll find that most are encrypted with a few exceptions, one of which is WLO which is transmitting continuously.

Tabletop SW radio set to WLO; SignaLink USB links radio to computer for decoding.

On 8.472 MHz you’ll receive weather information from different latitude/longitudes, along with other pertinent information to mariners such as high seas pirates (not radio pirates!) and naval maneuver areas that are important for ships to avoid. It makes for interesting copy.

To decode RTTY signals you’ll need a shortwave receiver with a BFO (Beat Frequency Oscillator), a way to pipe your radio’s audio into your computer’s sound card, and decoding software. There are several RTTY software packages out there, free, and my favorite is MMTTY. More info on MMTTY is at: http://hamsoft.ca/pages/mmtty.php . Old timers will find this software a snap to use, but newcomers will have to fiddle with the controls to get the decoding going. Below is a snapshot of MMTTY decoding a typical weather broadcast.

MMTTY dashboard with WX info. Cross-like indicator on upper right aids in tuning signal.

Another software available for decoding RTTY is Fldigi. Again, you’ll have to input the correct RTTY parameters such as baud rate and shift into the program along with adjusting your VFO carefully. It takes practice, but when the decoding is successful you’ll see Fldigi doing it’s thing as shown below. Both MMTTY and Fldigi have waterfalls displaying a visual image of the received signal. With practice you’ll be able to distinguish the different common RTTY shifts just by looking at the waterfall.

Fldigi in action with split screen; RTTY text above, waterfall below.

Now to Sitor B (Simplex Teletype Over Radio Mode B), another non-voice mode we can use to decode WLO transmissions. Sitor B sounds a lot like RTTY to the human ear, but requires different decoding software. WLO transmits weather information via Sitor B immediately after RTTY transmissions, switching back and forth, which makes for even more fun! Software that decodes Sitor B is available on the ‘Net as free downloads. One is MultiPSK, the other is YaND.

I like YaND (Yet another Navtex Decoder) which is used to decode NAVTEX (Navigational Telex) transmissions commonly found on 490 KHz and 518 KHz, but it works well for decoding Sitor B. There is a difference in the way messages are processed in NAVTEX versus Sitor B and for further information perform a Google search. But the fastest and easiest way to decode Sitor B transmissions from WLO is to fire up YaND. Below is a recent NAVTEX HF broadcast capture.

WLO HF WX broadcast for NE Gulf on 1/18/16 .

Well, hopefully some of you will be inspired to check out maritime weather/safety information found on WLO using RTTY/Sitor B/NAVTEX software. However, RTTY can also be found on the ham bands and on shortwave frequencies. Several RTTY stations from Germany are found on frequencies such as 11.039MHz and 14.467MHz. Their weather information format is quite different and will give you an idea of European weather conditions and allow you to practice your German. When not sending weather info they run a RTTY message loop below at 50bauds/425Hz shift.

German RTTY station with message loop. Deciphered via MultiPSK.

In closing, make sure to also check out the NAVTEX broadcasts found just below the AM broadcast band on 490 and 518 KHz; using YaND or MultiPSK you’ll be able to receive these transmissions, but remember you’re not on HF, you are on MW (medium wave), where signal distances are shorter and present a greater reception challenge. YaND software has a NAVTEX broadcast schedule built in as seen below; you have to identify your specific NAVAREA or navigational area, then look at the times and frequencies to determine when to listen in. My QTH is in NAVAREA 4. Lots of interesting information is passed in these NAVTEX transmissions so listen in and have fun!

YaND NAVTEX schedule for various NAVAREAS.

NAVTEX on 518 KHz from station VAR-9, New Brunswick, CAN. Messages begin with “ZCZC.

Mario Filippi (N2HUN), is the author of this post and a regular contributor to the SWLing Post. Click here to read Mario’s guest posts.

Spread the radio love

eBay find: Pristine Sears 412.36380700 (Yaesu FRG-7) Shortwave Communications Receiver

11 Replies

Sears-Yaesu-FRG-7

This must be the day for eBay finds! This one will not be a deal (price-wise) unless you’re on the market for a NOS (New Old Stock) classic receiver.

Many thanks to SWLing Post contributor, Mario Filippi (N2HUN), who writes:

On eBay is an auction that is worth watching, just to see what the final bid will be:

Sears 412.36380700 (613638) Yaesu FRG-7 Shortwave Communications Receiver / NOS

Sears-Yaesu-FRG-7-2

This is a new old stock Sears version of the FRG-7, no different from the Yaesu except it had the Sears name on it.

Used ones have been sold on eBay but this is the first one I’ve seen that was NOS.

Amazing what people have stored away in attics, closets, basements, etc. I had one of the Sears versions years ago. Note that the older versions of the Yaesu FRG-7 did not have the fine tuning knob. This one is apparently one of the later versions.

All round excellent radio, nice big speaker, excellent sensitivity, selectivity, one of the shortwave radio hall-of-famers!

Click here to view on eBay.

Indeed, Mario! Thanks for the tip! As you say, it will be fun to see how high this listing may go befor ethe bidding ends tomorrow afternoon/evening. It’s rare to find a Sears or Yaesu so pristine.

Here are few more photos I pulled from the listing–click to enlarge:

Sears-Yaesu-FRG-7-4 Sears-Yaesu-FRG-7-6 Sears-Yaesu-FRG-7-7 Sears-Yaesu-FRG-7-3

Spread the radio love

A review of the AOR AR-3000A Wideband Receiver

9 Replies

ar3000Alrg

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

The AOR AR-3000A Wideband Receiver

by Mario Filippi, N2HUN

(All photos below by author)

The AOR AR-3000A is a wideband communications receiver, made in Japan, covering 100KHz – 2.036 GHz with all popular modes including AM, NFM, WFM, CW, USB and LSB. The AR-3000A was produced in the early ‘90’s at the price of $1063 and came with a telescoping back-of-set antenna, wall-wart power supply, and well written 57 page manual.

AOR is a long time reputable manufacturer of radios and electronic equipment that continues on today producing high quality equipment. While the AR-3000A can be considered a tabletop unit, it is quite small, measuring only 8” x 5” x 3.5”. The AR-3000A has a total of 400 memory channels, with four “Banks” (Banks A- D) each holding up to 100 channels. Each stored channel holds all the necessary parameters such as frequency, mode, attenuator, and step size. An optional mounting bracket for mobile operation was available along with an optional DC cord for those wanting to use it as a scanner for public safety monitoring. It does not run on internal batteries though.

What I like about this radio is it’s wide coverage and it functions as my main longwave/shortwave receiver in addition to a scanner for monitoring local VHF/UHF public safety bands.

AOR 3000

As desktops go, this one has an unusual shape. While the unit is horizontally shaped for the most part, the front panel is angled slightly upward to make the controls easier to read. However, it took a while to get used to the small print on the panel and LCD so if you wear glasses, definitely don them because you’ll need ‘em. As a matter of fact I’m contemplating purchasing a pair of those magnifying eyeglasses to see (pun intended) if they’ll help (hi hi!).

AOR-3000-side view

These units come up for auction on Ebay and on ham classifieds at a much reduced price, most in remarkably good shape for a quarter-century old receiver.

A recent survey of Ebay auctions show they run from about $183 – $350; over several hundred dollars less than the original price. I chose to purchase one from a ham classified website at a higher price but it was well worth it. When it comes to high price tag items I tend to scout out the ham ads first. The seller was a friendly, honest ham who was a great communicator so the deal went smoothly. He included the computer control cable and even replaced the backup memory CR2032 battery, something every buyer should consider when purchasing vintage units.

For advertisements of vintage AOR products check back issues of Monitoring Times at: www.americanradiohistory.com . This site is an excellent resource for old time radio, TV, broadcasting and miscellaneous electronics publications and contains a mind boggling array of books and periodicals from the past.

The front panel is laid out quite well, with soft touch pads in the center allowing easy parameter entry, a tuning knob on lower right, and my favorite, a manual squelch knob. Most of the touch pads have a secondary function which appears in white lettering while primary functions are in yellow. If you’d rather not spin the VFO dial, which is quite small (0.75” diameter) there are up/down arrow keys to accomplish that function. The knob spins smoothly with no obvious détente.

Front panel (sorry about the camera shutter ghost!)

The rear of the unit has several connections: BNC antenna, 12V input, DIN socket for a recorder, external speaker, RS232C for computer remote control, and On/Off switch for computer/manual control. Back in the day you could purchase ScanCat Gold software for about $95.00 that would allow computer control of the unit. I am in the process of finding any existing software that will allow that and it’s not easy to come by, but that is not a priority.

Oh and where is the speaker you might ask? On the underside of the unit.

Plenty of rear connections.

This unit was purchased to save space at my desk as it’s quite small and serves as my main source of longwave, medium wave, shortwave, and VHF/UHF reception. For HF it’s hooked to an S9 43 foot vertical antenna with many (50+) radials. S9 Antennas unfortunately is no longer in business, but when the company had just started up I purchased the 43 footer for ham use. It’s lightweight, made completely of fiberglass, and has been up several years with no problems.

S9 antennas was eventually sold and the antennas were available from LDG Electronics last time I looked. If you check out their pictures at http://www.ldgelectronics.com/c/252/products/12/62/3 you’ll see my house on the left sporting the S9v43 footer. By the way, when I bought the AR-3000A, the seller stated that ”it’s a great radio as long as you don’t connect too big of an antenna to it”(hi hi!). Yes, I found it tends to suffer from overload with my large antenna, but the 3000A has a useful built-in attenuator

As a wideband receiver the AR-3000A fits my needs perfectly. For LW it receives aeronautical beacons as far away as Quebec and New Brunswick, Canada. NAVTEX transmissions on 518 KHz are easily decoded using a SignaLinkUSB and YAND software.

As for HF, I’m mainly a utility listener and have a bank of memory channels for WWV (2.5, 5, 10, 15,20 MHz), WLO (8.471MHz), CB channels, Volmet stations, USCG facsimile frequencies, W1AW on 3.581 for code practice, a slew of RTTY station frequencies, the 10m FM band repeater frequencies, Radio Habana Cuba, 4XZ (great for code practice), WLO maritime weather broadcasts, and several channels for different ham band frequencies of interest.

Radio Shack discone offset –mounted on TV antenna mast.

For scanning, obviously the 3000A can’t compete with modern scanners. It was a different era back then. So, no trunking, no CTCSS tones, and the scanning speed slow compared to today’s standards, but it does have the usual features like channel lockout, scan delay, priority channel, step adjustment, search mode and does cover the military aeronautical band.

As a basic scanner for monitoring local state/local first responders, aeronautical (ATIS, ACARS) channels, NOAA satellites, NOAA weather channels, my local repeater, GMRS, FRS, taxis, railroads, etc., it is a very satisfactory performer. I can even hear the NY City Transit police from my location in W. New Jersey which is a pretty good distance, ATIS from LaGuardia and Philadelphia airports, and taxis in the Philly area, all while using a Radio Shack discone on the chimney.

For a more in-depth review of the AR-3000A by Bob Parnass, check the November 2000 issue of Monitoring Times magazine. Universal Radio has a great archive of discontinued radios so check them also at www.universal-radio.com. User reviews can be found on www.eham.net, that’s one of my favorite feedback sites. There’s also an AR-3000A Yahoo users group that’s a great resource. If you want to see videos of the rig in action then search on YouTube as there’s a good number available. In conclusion, I’m very satisfied with the AR-3000A, it’s exactly what I was looking for and is an integral part of radio receiver history.

If any other AR-3000A owners are out there, let’s hear from you. Thanks and 73’s!

Many thanks for this excellent review, Mario. I always thought the AOR AR-3000A was a cool little receiver. When it was being produced, the price was way beyond my means as a college student. At the time, though, it had to be the most compact, best performing, wideband receiver on the market!

If any Post readers can help Mario find a solution for computer control of the AR-3000A, please comment!

Thanks again, Mario–we look forward to your next contribution!

Spread the radio love

A Little Taste of Cuba on Free To Air Satellite

7 Replies

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

A Little Taste of Cuba on Free To Air Satellite

by Mario Filippi, N2HUN

(All photos courtesy of author)

Tropical countries have always held a fascination for me, Cuba being at the top of the interest totem pole. Perhaps it’s due to the fact that baby boomers (such as me) remember early 1960’s weekly drills in grammar school, ducking under our desks during the Cuban missile crisis when the cold war was a fact of life. President John Kennedy, Fidel Castro, and Nikita Khrushchev were the primary combatants in those days, and we had to be prepared for a possible attack. Fortunately our country was spared from any stateside skirmishes, but since those days when Cuba became a forbidden place for US travelers, its history and its people have always captivated my imagination.

For those interested in what’s going on in Cuba there’s always shortwave radio; Radio Habana Cuba always pegs the shortwave “S” meter and is received loud and clear. On certain nights when propagation on the BCB (broadcast AM band) is favorable towards the Caribbean, Radio Reloj (Radio Clock) can be heard with its’ “RR” identification in CW every minute on the minute.

But there’s another way to keep current with Cuban events in ways that a shortwave radio cannot provide, and that is through Free To Air satellite, which provides worldwide reception of television and radio stations. A typical FTA satellite installation appears below, consisting of a dish and an LNB pointed towards a satellite of interest. There are about a dozen Ku band satellites available in the Clarke Belt 22,600 miles away in geostationary orbit all beaming programming to different parts of the globe.

WS International Ku band offset dish with Chapparal Ku LNB

The signal from the satellite dish is fed via RG/6 coax to a satellite receiver which decodes the satellites’ data into TV and radio format that can be viewed or listened to on a standard television, and an example of a modern FTA receiver, the X-Square Premium Mini, sometimes called a STB (Set Top Box) is below. The X-Square Mini is one the smallest of the FTA receivers available and works very well.

X-Square FTA receiver, about the size of a cigarette pack.

Okay, so we have our receiver, dish, etc., now all we need to know is where to find Cuban programming in the Ku satellite band. As of this writing, Cuban television and radio programs are found on Hispasat at 30W, which has a spot beam to the USA and is easily received on the East coast. For more information on Hispasat just Google it or look it up on www.lyngsat.com. Pointing your dish at Hispasat, or for that matter at any other FTA satellite requires patience and knowledge, and you can check YouTube which has many videos on the subject. Best bet would be to have someone who’s experienced with FTA to assist you.

You’ll find about 55 TV channels on Hispasat covering S. America, Asia, Europe, USA, and the Middle East with several TV channels from Cuba such as Cubavision, Cubavision International, Senal ACN, Contribucion, Educativo, and Educativo 2. And from the USA, Radio Martis’ cousin TV Marti (yes there is a TV Marti!) is beamed.

Screen shots from some of these appear below:

TV Marti talk show with logo on lower right.

News, sports, music, info channel Senal ACN.

Cubavision International station identification.

Let’s move on to Cuban radio stations to be heard on Hispasat. First off, Hispasat covers about 57 radio stations from the Middle East, S. America, and Europe. Some of them will be familiar to SWLs while others are local AM and FM stations originating from the mother country, a distinct advantage to having FTA satellite. Cuban radio stations available on Hispasat are shown in the satellite scan below. A total of ten stations come in with FM quality reception over FTA satellite, with no fading or hiss. However, in the event of rain, Ku signals suffer terribly from moisture attenuation but that’s about the only reception hurdle you’ll have to endure. One of my favorite stations is CMBF with its beautiful classical music.

Cuban radio stations scanned in from satellite Hispasat at 30W.

So hopefully this little introduction into Cuban radio and TV using Free To Air satellite will kindle interest in this “ultra-shortwave” mode of looking (and listening) into what’s happening in this culturally rich island that’s been out of reach for most United States citizens for over half a century.

Thank you so much for the excellent post, Mario. As I’ve mentioned before, I’m planning to install an FTA system at my house in the near future. Your guidance is most helpful!

Spread the radio love

eBay: Mario considers the Time Out Radio Bench

3 Replies

Many thanks to SWLing Post contributor, Mario Filippi (N2HUN), who writes:

Hi Thomas,

For hams and SWLs that have a lot of clutter, a great idea, reminds me of a foot stool that has been re-purposed for radio buffs. Nice idea, good price, free shipping, what’s not to like? My spending finger’s getting itchy hi hi.

Click here to view on eBay.

I’m with you, Mario: this is not a bad price for a useful and portable shelf that is even made here in the USA (Kentucky). I could see using one on Field Day where horizontal space is often limited on club tables.

It appears that the seller (a ham: Ron, KK4RON) purchased a large number of these in a deal. He writes this in the product description:

These benches are great for setting up a compact ham station or use 3 for a surround set up , They also stack nicely if you only have a narrow space available. Go UP rather than out.

These are very sturdy and well made in the USA by a factory in Kentucky , the surface is a very durable and easy clean kitchen cabinet material (Formica) on 3/4″ wood so screwing on mounting brackets and mike holders and such is very easy

These were intended to sell for $49.95 but the company that ordered them went out of business before they had payed the factory so the factory got stuck with literally thousands of these finished and ready for sale.

We were able to acquire there entire inventory including boxes and packaging at a fantastic price but that is also why we are limited to 8 colors and 2 top colors. But these are very well built from a factory (not home made) and just perfect for mounting several radios to and cleaning up your bench.

Again, many thanks, Mario, for sharing this find (and perhaps it’s time to get yourself an early Christmas gift?)!

Spread the radio love

Guest post: Trip Down Shortwave Memory Lane via Vintage RadioShack Catalogs

6 Replies

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

Trip Down Shortwave Memory Lane via Vintage RS Catalogs

-Mario Filippi (N2HUN)

Attached is a wonderful website containing archived Radio Shack catalogs and sales flyers going back to 1939, surely of interest to SWLs, hams, and other electronics hobbyists. Most of us have fond memories growing up and visiting our local Radio Shack when it was the place to go for ham, shortwave, and scanner radios. My hometown Radio Shack was located on North Avenue in New Rochelle, NY and I purchased an electric guitar (could not afford a Fender) from them in the late 60’s which had three pickups and included a case for $29.95!

Radio Shack Catalogs

You see, back then Radio Shack had a much more diversified line of products, including musical instruments, power tools and even scientific stuff like microscopes and slide rules. These archived catalogs are a treasure trove of information not only from a historical perspective, but for anyone who is interested or who is contemplating purchasing vintage equipment such as shortwave radios, because you can look up the original sales info in the RS catalog which contains the original price, photo, description, and accessories available at that time.

For example, last year I purchased a “tech special” Realistic TRC-450 AM/SSB CB radio on Ebay that needed LED repair, so I looked up the original sales ad and got the price, photo (this helps to see original condition), and product description. Below is a picture of my restored Realistic which originally sold in 1980 for $269.95!

The classic Realistic TRC-450 AM/SSB CB radio. (Photo: Mario Filippi)

Nowadays most people don’t realize how expensive electronics were a few decades ago. A comparable new AM/SSB CB radio sells for about half that price nowadays!

Lastly, as one progresses chronologically through the catalogs, you can see technology (and even fashion) trends – the large 8 track tape decks of the 60’s and 70’s progressed to smaller cassette players of the 80’s and 90’s, then DVD/CD players made their entrance, ultimately giving way to higher tech forms of entertainment such as satellite radio and Internet-based entertainment. Well I hope you enjoy this totally entertaining and informative website and I thank the individual who took the time and effort to preserve for perpetuity these priceless annual time capsules for everyone to enjoy.

Mario, many thanks for this trip down memory lane!

As you state, these catalogs are actually an excellent reference source when trying to determine pricing and features of RS radios found on the used market.

I think they’re also so much fun to flip through as they’re chock-full of nostalgic value. When I was a kid, I could care less about toy store catalogs–the RadioShack catalog was my toy store!

Indeed, when I open the online catalog copies at Radio Shack Catalogs, I can almost smell the ink on the pages! Am I the only one?

Spread the radio love

Listening to international radio via Free-To-Air Satellite

10 Replies

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

International Radio Broadcasts via Satellite

by Mario Filippi

I find your SWLing Post blog a constant fountain of information on the world of shortwave listening. Having been a shortwave listener since the early 1960’s, I’ve depended mainly on shortwave radios to hear foreign broadcasts. I’ve owned more shortwave radios than shoes (hi hi)–! However, there is a not-so-well known way of receiving radio broadcasts from around the world, and this is by Free To Air Satellite (FTA).

Free To Air satellite reception requires using a minimum 30 inch Ku band satellite dish, an LNB (Low Noise Block) amplifier, a Free To Air satellite receiver, and skills to aim at a satellite carrying these broadcasts.

There are several Free To Air satellites in the Clarke Belt, and the reception is cost-free as these broadcasts are for expatriates living around the world who need to tune in to stations back home. One satellite in particular that carries many foreign radio broadcasts is Galaxy 19, located at a longitude of 97 degrees, and is readily accessible from the USA.

Now let’s start on what an FTA dish set-up looks like for this type of reception. Below is an installation of mine, consisting of a 30 inch WS International satellite dish and LNB. A 30 foot length of RG/6 coax is run into the shack and hooked to an AMIKO Mini HD SE FTA receiver. Typical cost for a dish, LNB, coax is under $200.

Below is my AMIKO Mini HD SE FTA receiver, also known as an STB (Set Top Box), which can be purchased from a number of FTA vendors. This allows one to receive international television and radio broadcasts. They run about $90.

As stated earlier, Galaxy 19 is one of the best satellites to use for international radio broadcasts–currently, it has about 90 radio channels available for listening. I did a scan today of what is available, and below are three screenshots of the stations available to the listener.

Duna World radio is from Hungary. IRIB stands for Islamic Republic of Iran Broadcasting. 3 ABN is Apostolic Bible Network. TGN is Thai Global Network.

Kuwait, Syria, and the Middle East are well represented by the radio stations above. Voice of Russia, and Congo radio are good ones.

Voice of Turkey, Polski Radio found above. Not too shabby!

[Y]ou’ll find a good how-to on FTA at the following link:

http://www.packratvhf.com/Conference/uW_Satellites.pdf

[T]his is just a little introduction to the world of international listening using satellite. I hope this is something you and SWLing Post readers might find interesting.

Indeed I do, Mario! Thanks so much for taking the time to show us how to tune in a variety of international broadcasters via satellite. Each year at the Winter SWL Fest, we have demonstrations showing what can be done via FTA satellite. Perhaps I should bite the bullet and invest in one!

Spread the radio love