Monthly Archives: August 2011

Using exalted carrier reception to tune in pirate radio

I’ve found that one side benefit of installing a 40 meter delta loop this past weekend is that I now have an antenna which is practically ideal for listening to pirate radio stations in and around the 6925 kHz “watering hole.” So, I’ve been spent a lot of evenings recently listening for pirates with the new antenna.

Shortwave Pirate MAC Shortwave featured DJ Ultraman

Shortwave Pirate MAC Shortwave featured DJ Ultraman

But Sunday night was a noisy night on the 40 meter band–I was hearing active static crashes probably associated with hurricane Irene. I did pick up a relatively strong signal from pirate station MAC Shortwave with DJ Ultraman at around 20:40 EST (00:40 UTC)–listen to the end of the broadcast here:

Note that I start the recording using the Alinco DX-R8T, but find the bandwidth too wide (hence the adjacent broadcaster you hear), so I switch to my Palstar R30C. One bonus in this recording: Commander Bunny’s parody of “I Shot the Monkey” originally recorded from WBNY studios. 

At the top of the hour I heard Renegade Radio start a broadcast, but the signal was very weak here in the southeastern US. In fact, I couldn’t even ID the station. So, I turned to a trick I’ve used on tabletop and portable shortwave radios alike–namely, Exalted Carrier Reception (ECR) also known as Exalted Carrier Single Sideband (ECSS) reception.

What is ECR or ECSS?

Simply put, it’s when you tune in an AM broadcast using the SSB mode on your radio. In my case, I turned on the USB  (upper side band) mode on my Palstar and zero-beat the frequency–meaning, I tuned out the hetrodyne whine until the audio sounded as natural as possible.

This is sort of a “poor man’s version” of synchronous detection (and, frankly, a little inferior to sync detection on most radios).  Still, in this case, it made a huge difference in the intelligibility of the broadcast.

Why does it work?  Well, as my ham buddy Mike recently explained it:”You are removing any selective fading problems by filtering away one of the sidebands and injecting a carrier of steady amplitude which eliminates the ‘tearing’ heard when a broadcast carrier is varying in amplitude.”  Got that?

The Palstar R30 in USB mode tuned to Renegade Radio

At any rate, one of the reasons it works so well on my Palstar is because I can keep the bandwidth set rather wide while listening in SSB, thus helping a bit with the loss of fidelity that happens when moving off of the AM mode. If your radio automatically switches to a narrow filter in SSB mode, the audio fidelity may take a bigger hit, and degrade further.

Though I don’t have a comparison without using the ECR/ECSS method, I can tell you that the AM signal was barely audible. After tuning in using ECR, it became armchair listening.

Listen to almost one hour of Renegade Radio for yourself:

Those of you who have old radios with a very stable variable BFO (beat frequency oscillator) instead of a product detector might try using your BFO tuning to inject the BFO directly over the fading broadcast carrier to accomplish same kind of reception as ECR.

So, next time you have difficulty hearing a weak shortwave station, consider turning on the SSB mode and using the ECR/ECSS method. You may like what you hear!  Ahoy, there…

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A West Dorset view on the Rampisham Radio Transmitting Station closure

Photographer: Nigel Mykura. (Creative Commons)

(Source: Real West Dorset)

RAMPISHAM’S radio transmission station may close before Christmas with the loss of more than 20 jobs, even though it’s currently broadcasting into Libya.

The proposed shutdown of the Dorset site follows the BBC’s decision earlier this year to cut back on World Service shortwave broadcasting and stop it altogether by 2014, even though nearly half of the World Service’s audience (184 million in 2010-11) listens via shortwave.

The BBC says it’s phasing out shortwave because the Foreign Office cut the World Service grant by 16% (£46 million).

The author, Jonathan Hudston points out:

Britain has three major sites broadcasting internationally on shortwave. The others are Woofferton in Shropshire and Skelton in Cumbria. Rampisham broadcasts more hours than they do, is more reliable, and has a wider reach across Europe, Africa and the Middle East. (It’s a little-known fact that the National Grid runs right through the Rampisham site, supplying 60,00 volts. I think it has only ever lost power twice in 70 years. Once was during the Great Storm of 1987, which shows it takes something pretty extreme).

He goes on to ask:

Is it really in the UK’s national interests to dismantle Rampisham and sell its equipment for scrap?

The modern preference is said to be for internet-based services, but Jo Glanville, in a good piece about the World Service in the current edition of the London Review of Books, makes the point that shortwave radio can reach many millions of people in ways that internet-based services cannot.

He has a very good point. As we’ve mentioned numerous times before, shortwave radio crosses borders better than any other medium. It’s hard to block and untraceable.

(Read the Full Article Here)

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Pirate Radio and Hurricane Irene

Last night, I tuned to the pirate radio watering hole of 6,925 kHz shortwave. I caught a bit of the Southern Relay Network as they played several hurricane and storm themed songs.

I recorded a bit of the end of the show for you. Note that there was a lot of noise on the frequency–many of the static crashes were attributed to Hurricane Irene herself.

Click here to download/play the mp3 file, use the flash player below (if visible) or simply visit the audio page. Enjoy!

Radio used, by the way, was the Alinco DX-R8T. We will be posting a review of this receiver, so check back soon!

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Listen to hurricane watch nets on your shortwave radio

As of time of this posting, Hurricane Irene is on a path that could threaten a large swath of the east coast of the United States. If you have a shortwave radio, even a portable, that can tune in SSB (or Single-Side Band) you can listen to or participate in the Hurricane Watch Net courtesy of your radio.

How to find the Hurricane Watch Net on your portable shortwave radio

Simply tune your radio to 14,325 kHz (or 14.325 MHz). Since these signals are often weaker than AM broadcast signals, you should fully extend your antenna.

Next, turn on the SSB or BFO switch on your radio.  These are labeled in various ways, but when you activate the SSB mode, the audio characteristics of your radio will change rather dramatically.

If there is activity on the frequency (i.e., the Watch Net is busy), you should hear voices. More than likely, you will need to tune the SSB to make the voices intelligible.  Typically, there will be a dedicated fine tuning knob/wheel to allow you to do this.

Keep in mind that if you hear nothing but static, that may only be because there is no current traffic on the net. Patience will pay off.


Can you participate in the Hurricane Watch Net and make reports on your weather observations if you’re not a licensed amateur radio operator? Of course! In fact, the Hurricane Watch Net states:

The National Hurricane Center collects observations from people in coastal areas who have home weather stations.  Send an e-mail to [email protected] and request information about this program or use their on-line submission form by clicking here.

I will attempt to record some sample audio from the Hurricane Watch Net and post it here (on this page) in the near future.

Also, please note that there are many other frequencies to monitor in the resources section below. Many frequencies are specific to a region, like North Carolina (tune to 3923Khz or  7232Khz SSB), so be sure to try several, not just the HWN.



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North Carolina Public Television features VOA Greenville

This is an excellent video about the VOA Greenville transmitter site produced by North Carolina Public Television. What I love most is the time they took to explain the importance of shortwave radio across our globe, how it is an existing technology that governments and regimes cannot easily block or track. We certainly repeat this theme often, here on the SWLing Post.

Please enjoy and share.

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How to celebrate National Radio Day

ETOW's self-powered shortwave radios continue to be an invaluable source of information in post-earthquake Haiti.

August 20th is National Radio Day, a day for celebrating the invention of radio and this amazing 110+ year old communications medium, still so vital to information access throughout our world.

Those of you who still believe in the relevance of radio, please consider giving the gift of radio by making a tax-deductible donation to Ears To Our World (ETOW). ETOW sends self-powered (wind-up) shortwave radios to some of our planet’s most rural and impoverished  schools and communities, often where there is no internet access nor power grid.

We’ve mentioned ETOW in many previous posts. The organization has been featured in the Wall Street Journal, Popular Communications, the BBC World Service, VOA, and Public Radio International’s The World Technology podcast.

Those who think shortwave radio has limited use in today’s information age should see how much impact it has in parts of the world where ETOW works. In these regions, often remote or war-torn, radio connects communities with the rest of the world–and it can mean the world.

Click here to visit ETOW’s website and make a donation.

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Don’t expect WWV to only give you the time of day

WWV building in Fort Collins, Colorado (photo courtesy: NIST)

Last Monday, while taking a walk and listening to a Tecsun PL-380 in review, I tuned to WWV (10,000 kHz) at 10 minutes after the hour. I heard a full NOAA marine weather report including tropical storm activity in the Atlantic and a weather system in the Pacific that could potentially threaten west coast marine traffic.

This reminded me that WWV is a one-stop source for a lot of information, not “just” the time of day that we all expect of it.  In fact, the NIST (National Institute of Standards and Time)  recently conducted a survey where they asked listeners what they liked/used of the existing WWV programming and asked for any suggestions of potentially useful content.  Indeed, due to the results of the survey, WWV will keep the Geo Alert information they had considered dropping.

Thanks to all of you who took the survey.

WWV (or the NIST) in many respects, is not only broadcaster, but a tool–a basic radio listener right, at least if you live in North America. Of course, there’s Canada’s CHU too, but it doesn’t have the panache of  WWV. Well, in my humble opinion at least (for more on my thoughts of WWV, check out this previous post).

For reference purposes, below, (and for our Kindle subscribers) I’ve included information from the NIST website which states all of the features of WWV. Next time you tune in, listen for special announcements in the mix.

PS-If you’re a serious fan of WWV, then consider listening to the album “At The Tone.”

WWV Broadcast Format - Click to enlarge

(Source: The NIST)

Time announcements
Voice announcements are made from WWV once every minute. The WWVH announcement occurs first, at about 15 s before the minute. The WWV announcement follows at about 7.5 s before the minute. The announced time is “Coordinated Universal Time” (UTC). UTC was established by international agreement in 1972, and is governed by the International Bureau of Weights and Measures (BIPM) in Paris, France. Coordination with the international UTC time scale keeps NIST time signals in close agreement with signals from other time and frequency stations throughout the world.

UTC differs from your local time by a specific number of hours. The number of hours depends on the number of time zones between your location and the location of the zero meridian (which passes through Greenwich, England). When local time changes from Daylight Saving to Standard Time, or vice versa, UTC does not change. However, the difference between UTC and local time does change-by 1 hour.
UTC is a 24-hour clock system. The hours are numbered beginning with 00 hours at midnight through 12 hours at noon to 23 hours and 59 minutes just before the next midnight.

The WWV interval pulse diagram. Click to enlarge.

Standard Time Intervals
The most frequent sounds heard on WWV and WWVH are the seconds pulses. These pulses are heard every second except on the 29th and 59th seconds of each minute. The first pulse of each hour is an 800 ms pulse of 1500 Hz. The first pulse of each minute is an 800 ms pulse of 1000 Hz at WWV and 1200 Hz at WWVH. The remaining seconds pulses are short audio bursts (5 ms pulses of 1000 Hz at WWV and 1200 Hz at WWVH) that sound like the ticking of a clock.

Each seconds pulse is preceded by 10 ms of silence and followed by 25 ms of silence. The second marker for the broadcast is at the end of the 10 ms period and the start of the 5 ms period. The station’s on-time marker is synchronized with the start of the 5 ms tone. The silence before and after the pulses makes it easier to identify the second pulses. As shown in the graphic below, the total zone around the second pulses lasts for 40 ms, consisting of 10 ms of silence, the 5 ms tone, and another 25 ms of silence. Then, the standard frequency audio tones resume.

Standard Frequencies
Both WWV and WWVH broadcast standard frequency audio tones that alternate during most minutes of the hour. Most minutes feature a 500 or 600 Hz audio tone. However, a 440 Hz tone is broadcast once per hour, and some minutes do not include any audio tones at all.

The 440-Hz tone (the musical note A above middle C) is broadcast once each hour, during minute 2 on WWV, and minute 1 on WWVH. In addition to being a musical standard, the 440-Hz tone provides an hourly marker for chart recorders and other automated devices. The 440-Hz tone is omitted, however, during the first hour of each UTC day.

UT1 Time Corrections
The UTC time scale broadcast by WWV and WWVH meets the needs of most users. UTC runs at an almost perfectly constant rate, since its rate is based on cesium atomic frequency standards. Surprisingly, some users need time that is related to the rotation of the Earth, which is less stable than UTC. Applications such as celestial navigation, satellite observations of the Earth, and some types of surveying require time referenced to the rotational position of the Earth. These users rely on the UT1 time scale. UT1 is derived by astronomers who monitor the speed of the Earth’s rotation.

You can obtain UT1 from the time signals broadcast by WWV and WWVH. UT1 is available at two levels of accuracy. If you need UT1 with an uncertainty of 1 s, you can simply use UTC, since the two time scales are always kept within 0.9 s of each other. Occasional corrections of exactly 1 s are inserted into the UTC time scale to keep the two time scales in agreement. These corrections, called leap seconds, are coordinated under international agreement by the International Earth Rotation Service. Leap seconds can be either positive or negative, but so far, only positive leap seconds have been needed. A positive leap second is normally added every 1 or 2 years, usually on June 30 or December 31.

If you need UT1 with an uncertainty of 0.1 s, you can apply a correction to UTC. UT1 corrections are encoded into the broadcasts by using doubled ticks during the first 16 s of each minute. You can determine the amount of the correction (in units of 0.1 s) by counting the number of doubled ticks. The sign of the correction depends on whether the doubled ticks occur in the first 8 s of the minute or in the second 8 s. If the doubled ticks are in the first 8 s (1-8) the sign is positive. If the doubled ticks are in the second 8 s (9-16) the sign is negative. For example, if ticks 1, 2, and 3 are doubled, the correction is +0.3 s. This means that UT1 equals UTC plus 0.3 s. If UTC is 8:45:17, then UT1 is 8:45:17.3. If ticks 9, 10, 11, and 12 are doubled, the correction is -0.4 s. If UTC is 8:45:17, then UT1 is 8:45:16.6. If none of the ticks are doubled, then the current correction is 0.

BCD TimeCode
WWV and WWVH continuously broadcast a binary coded decimal (BCD) time code on a 100-Hz subcarrier. The time code presents UTC information in serial fashion at a rate of 1 pulse per second. The information carried by the time code includes the current minute, hour, and day of year. The time code also contains the 100-Hz frequency from the subcarrier. The 100-Hz frequency may be used as a standard with the same accuracy as the audio frequencies.
Geophysical Alerts

The National Oceanic and Atmospheric Administration (NOAA) uses WWV and WWVH to broadcast geophysical alert messages that provide information about solar terrestrial conditions. Geophysical alerts are broadcast from WWV at 18 minutes after the hour and from WWVH at 45 minutes after the hour. The messages are less than 45 s in length and are updated every 3 hours (typically at 0000, 0300, 0600, 0900, 1200, 1500, 1800, and 2100 UTC). More frequent updates are made when necessary.
The geophysical alerts provide information about the current conditions for long distance HF radio communications. The alerts use a standardized format and terminology that requires some explanation. Before looking at a sample message, let’s define some of the terminology:
Solar flux is a measurement of the intensity of solar radio emissions with a wavelength of 10.7 cm (a frequency of about 2800 MHz). The daily solar flux measurement is recorded at 2000 UTC by the Dominion Radio Astrophysical Observatory of the Canadian National Research Council located at Penticton, British Columbia, Canada. The value broadcast is in solar flux units that range from a theoretical minimum of about 50 to numbers larger than 300. During the early part of the 11-year sunspot cycle, the flux numbers are low; but they rise and fall as the cycle proceeds. The numbers will remain high for extended periods around sunspot maximum.

The A and K indices are a measurement of the behavior of the magnetic field in and around the earth. The K index uses a scale from 0 to 9 to measure the change in the horizontal component of the geomagnetic field. A new K index is determined and added to the broadcast every 3 hours based on magnetometer measurements made at the Table Mountain Observatory, north of Boulder, Colorado, or an alternate middle latitude observatory. The A index is a daily value on a scale from 0 to 400 to express the range of disturbance of the geomagnetic field. It is obtained by converting and averaging the eight, 3-hour K index values. An estimate of the A index is first announced at 2100 UTC, based on 7 measurements and 1 estimated value. At 0000 UTC, the announced A index consists entirely of known measurements, and the word “estimated” is dropped from the announcement.

Space Weather describes the conditions in space that affect earth and its technological systems. Space weather is a consequence of the behavior of the sun, the nature of earth’s magnetic field and atmosphere, and our location in the solar system.

Space Weather storms observed and expected are characterized using the NOAA Space Weather scales. The abbreviated table below shows the levels of activity that are included in the announcements and the associated terminology. The descriptor used to identify observed or expected conditions is the maximum level reached or predicted. The NOAA Space Weather Scales are further described at the Space Environment Center’s web site.

NOAA Space Weather Scales

Geomagnetic Storms

Solar Radiation Storms

Radio Blackouts

G5 S5 R5 Extreme
G4 S4 R4 Severe
G3 S3 R3 Strong
G2 S2 R2 Moderate
G1 S1 R1 Minor

Geomagnetic storm levels are determined by the estimated 3-hourly Planetary K-indices derived in real time from a network of western hemisphere ground-based magnetometers.

Geomagnetic Storm Levels


Planetary K indices Geomagnetic storm level

K = 5


K = 6


K = 7


K = 8


K= 9



Solar Radiation storms levels are determined by the proton flux measurements made by NOAA’s primary Geostationary Operational Environmental Satellite (GOES).

Solar Radiation Storm Levels


Flux level of > 10 MeV particles Solar Radiation Storm level
10 S1
102 S2
103 S3
104 S4
105 S5


Radio Blackout levels are determined by the x-ray level measured by the primary GOES satellite.

Radio Blackouts


Peak x-ray level and flux Radio Blackout level
M1 and (10-5) R1
M5 and (5 x 10-5) R2
X1 and (10-4) R3
X10 and (10-3) R4
X20 and (2 x 10-3) R5


Every geophysical alert consists of three parts as shown in the two tables below. The first table describes the information contained in the geophysical alert. The second table provides example text from an actual message.

Information in Geophysical Alert Voice Message

Section Information in Voice Message
1 The solar-terrestrial indices for the day: specifically the solar flux, the A index, and the K index.
2 Space Weather storms observed during the previous 24 hours. Includes all observed geomagnetic storms, solar radiation storms (proton events) and Radio blackouts (class M1 and greater flares).
3 Space Weather expected during the following 24 hours.

Example Text from Actual Geophysical Alert Message

Section Example of Actual Geophysical Alert Message
1 Solar-terrestrial indices for 08 November follow.Solar flux 173 and Mid-Latitude A-index 14The Mid-latitude K-index at 1500 UTC on 08 November was 3.
2 Space Weather for the past 24 hours has been severe.Solar radiation storm(s) reaching the S4 level is in progress.Radio blackouts(s) reaching the R2 level occurred.
Alternate section 2 No Space Weather storms have been observed during the past 24 hours.
3 Space Weather for the next 24 hours is expected to be severe.Solar radiation storms reaching the S4 level are expected to continue. Radio blackouts reaching the R2 level are expected.
Alternate section 3 No Space Weather storms are expected during the next 24 hours.

Marine Storm Warnings
Marine storm warnings are broadcast for the Atlantic and Pacific oceans and the Gulf of Mexico. The National Weather Service provides the storm warning information. Atlantic highseas warnings are broadcast by WWV at 8 and 9 minutes after the hour, and a Pacific highseas warning is broadcast at 10 minutes after the hour. WWVH broadcasts a Pacific highseas warning at 48, 49, 50 and 51 minutes after the hour. Additional segments (at 11 minutes after the hour on WWV and at 52 minutes after the hour on WWVH) are used if there are unusually widespread storm conditions. The brief voice messages warn mariners of storm threats present in their areas.

The storm warnings are based on the most recent forecasts. The forecasts are updated at 0500, 1100, 1700, and 2300 UTC for WWV; and at 0000, 0600, 1200, and 1800 UTC for WWVH. All marine forecasts rely heavily on the Voluntary Observing Ship (VOS) program for obtaining meteorological observations.

Here is the text of a typical storm warning announcement:
North Atlantic weather West of 35 West at 1700 UTC; Hurricane Donna, intensifying, 24 North, 60 West, mov­ing northwest, 20 knots, winds 75 knots; storm, 65 North, 35 West, mov­ing east, 10 knots; winds 50 knots, seas 15 feet.

For more information about marine storm warnings, write to: National Weather Service, NOAA, 1325 East West Highway, Silver Spring, MD 20910. Or, visit the National Weather Service web site.

Global Positioning System (GPS) Status Reports
The United States Coast Guard sponsors two voice announcements per hour on WWV and WWVH, giving current status information about the GPS satellites and related operations. The 40-s announce­ments begin at 14 and 15 after each hour on WWV and at 43 and 44 minutes after each hour on WWVH. The announcement can be heard by telephone by dialing (703) 313-5907. For further information, contact the U.S. Coast Guard Navigation Center, 7323 Telegraph Road, Alexandria, VA 22310, or call (703) 313-5900.

(Source: NIST)

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