Mistaken identity and radio station loggings

One of the most important things a DXer must do if they are serious with the hobby is be certain that the signals that they log are truthful, accurate, and honest.  This has been one of the major rules that I have followed in my 20+ years of FM, AM, and TV DXing.  Thankfully, modern technology such as Google, live streaming, HD Radio, RDS, and audio recording have made researching and positively IDing radio stations something relatively easy to do.  Even with these tools available, extreme caution must still be made to ensure that one doesn’t inadvertently log the wrong radio station.

I rarely log any radio station, AM or FM, without some sort of confirmation that it is, in fact, the station I heard.  This positive ID may come via a station ID, local ads, or an HD Radio or RDS decode.  Or, I may match a station to its live webstream and, after confirming it isn’t part of a nationwide radio network, consider it a positive log.  This has been the tried-and-true method of identifying signals ever since I started DXing in 1999.

It is rare for me to be scratching my head after hearing such a positive ID, but that is exactly what happened to me on December 16.  On November 26, wrote how I logged my all-time distance record for all broadcast bands, 600 CJWW from Saskatoon, SK, a classic country station named “Country 600 CJWW.”  CJWW was 1690 miles away from where I received it in Springfield, VA.  Part of the frustration I faced with CJWW was that my recorder wasn’t running, so although I did hear a positive ID, I didn’t have “proof” of it to present on this blog.  On December 26, I heard country music again on AM 600 while driving in Springfield and I hit “record.”

As heard in the above audio clip, the DJ gives the weather forecast in Celsius (indicative of the signal being from Canada), and she invites listeners to text the station at #269269.  She then gives the “Country 600” station ID.  I was ecstatic–I finally had an audio recording of my furthest broadcast logging.  But something didn’t seem right.  A simple Google search came up with a different result: the DJ was giving a forecast for 17 degrees, but the temperature in Saskatoon was forecast to be -25 Celsius at the same time.  The 269269 text number, per Google, belonged to another radio station with the same name as CJWW: 600 CKAT North Bay, ON, at 524 miles away.

Graphics referencing the #269269 texting code from CKAT on their website. Image credit: CKAT/Rogers Media.

The audio clip above is a slam-dunk positive ID of CKAT.  There’s no question that I heard that signal on December 16.  But what does that mean for my previous logging of CJWW, which also identified as “Country 600?”  Does this mean that I never logged CJWW, and that I, in fact, heard CKAT instead?  Common logic would dictate that the answer would be yes, since CKAT is 1166 miles closer than CJWW.

Interestingly, the answer is actually “no.”  I distinctly heard the DJ say “CJWWradio.com” during my logging of CJWW earlier this year.  CKAT’s website is www.country600.com.  The Saskatechewan station also identified as “Country 600 CJWW” a few times during my intial logging, while CKAT IDed as simply “Country 600.”  Although I don’t have audio proof of my logging of CJWW (much to my frustration), their callsign was what I heard and, thus, proves that I heard both CJWW and CKAT.  This is a rare situation where two stations on the same frequency have the same name and, even so, constitute separate logs.

I have added CKAT’s logging to my AM DX log.  I will update this blog when (and if) I log CJWW again and record a clip from the signal.

Apparent new HD Radio callsign IDs appear; incompatible with Sony XDR-F1HD

One benefit of owning an HD Radio in the United States is that all HD signals display a digital ID. Most stations broadcast their callsign assigned to them by the FCC, i.e. “WKYS,” while others broadcast their name, such as “STAR-FM.” Regardless of if a station chooses to show their callsign or name, they are limited to four characters and an optional suffix of “-FM” at the end (the latter having no bearing on if the actual station’s callsign legally has “-FM” in it, or not).  Now it seems there is a new type of digital callsign appearing on stations that cannot be displayed on older HD radios, such as the Sony XDR-F1HD.

The Sony XDR-F1HD and its sister radios (the XDR-S10HDiP and XDR-S3HD) are among the first generation of HD Radios that debuted in 2008.  The radios would always quickly identify all HD Radio callsigns once an IBOC signal was found, regardless of if it was “WKYS” or “STAR-FM.”

Local 96.3 WHUR Washington, DC’s HD Radio signal was on and off-air sporadically in the first few months of 2019.  Their analog signal was also off-air at times, too.  Because of this, I assumed the station was upgrading their equipment. Before 2019, the station had a digital callsign of “WHUR-FM” on all HD Radios, as seen in the screenshot to the left below. For a brief period in April 2019, the broadcasted callsign was simply “HD,” as seen to the right below. Both callsigns were easily read and displayed by the Sony XDR radios.

Much to my surprise, during a dial scan on the Sony XDR-S10HDiP on May 18, I found the station was not broadcasting any digital callsign at all. The XDR-S3HD and XDR-F1HD radios also didn’t show any callsign on WHUR.

In my 20 years of DXing (11 of them having HD Radio capabilities), I have never seen a station simply not have a callsign displayed when their digital signal was tuned in.  Puzzled, I got out my other HD Radios (the Insignia NS-HD01 and Insignia NS-HDRAD2) and found that they were, indeed, displaying a digital callsign from WHUR, albeit with a new suffix at the end I had never seen before: “WHUR HD.”

The next day, I tuned in WHUR on my parent’s 2016-model car that has HD Radio, and found it could also “see” the updated “WHUR HD” callsign.

Another HD-capable radio I own, the Sangean HDR-14, can only display four characters in its digital callsign area and it doesn’t display the “-FM” suffix on participating stations.  This is a limitation of the radio itself, and the “HD1+!” seen on the screen below is not part of the callsign and is instead a function of the radio–it appears on all HD Radio signals, regardless if they have the “-FM” in their displayed callsign or not.  Even with the built-in limitations, the radio still displays the first four characters of WHUR’s updated “WHUR HD” callsign, as seen below. It doesn’t show a blank callsign like the Sony XDR radios do.

I think one of two scenarios are likely, given the developments with WHUR’s new callsign:

  1. HD Radio technology now allows a third “HD” suffix at the end of callsigns. A station can pick “WKYS,” “WKYS-FM,” or “WKYS HD.”
  2. Instead of being limited to four characters with an optional suffix at the end, HD Radio stations can now utilize the full seven characters to display any text of their liking.  This means a station could theoretically display “Hot1025” or “Country” as their HD callsign. In this scenario, WHUR simply chose “HD” at the end of a fully-customized seven character string.

As for why the Sony XDR-series radios cannot see the new WHUR callsign, I am leaning toward option #2 being what is in play at the moment. Since there are differences in suffixes already between HD Radio signals and all radios simply display whatever the station chose, I would assume that any HD radio would be able to show “HD” as a suffix if that was the case.  The technology is already there to account for differences in suffixes. In that instance, the Sony XDR radios should display “WHUR HD” without a problem.

Option #2, which affords changing the HD Radio data standard to allow for seven character callsigns, however, may cause a problem with older first-generation HD radios like the Sony XDRs.  My other HD Radios were manufactured 2012-2018, so they likely have newer technology under the hood that would be compatible with future upgrades in the HD Radio standard, such as allowing for longer digital callsigns.  Under this theory, since the Sony XDR radios are too old, they don’t “understand” the longer callsign being broadcast and, therefore, can’t display them, resulting in a blank on-screen display.

If my suspicions regarding option #2 are correct, then this would be a blow to the DXing community, since it means that if a station upgrades to the latest HD Radio technology, then there’s a chance that those with older HD Radios won’t be able to see any callsign upon a successful decode.  The potential of any digital radio simply not displaying a callsign due to an incompatibility in technology when other equipment could is a disappointment and it may mean a DXer could miss an otherwise slam dunk ID.

Hopefully, this is just an isolated issue with WHUR’s HD Radio signal, and not a sign of things to come nationwide.

The HD Radio callsign: How it has evolved over the years

HD Radio, also known as IBOC (In Band-On Channel), is the United States’ choice for digital radio broadcasting.  It debuted locally in my area in 2006.  One of the (few) benefits of HD Radio for listeners is the ability for capable stations to display their callsign on the screen of any HD Radio.  For DXers, this is a major plus, because during an intense tropo or Sporadic E event, one could theoretically identify any received IBOC signal immediately without the need to listen to the station for several minutes for an audio ID, potentially during a time when the signal would fade out, never to be heard (or identified) again.

The Sony XDR-F1HD radio displaying an HD Radio decode from 95.5 WPGC Morningside, MD, in 2008.

KMOD-FM, 5/29/08, HD RadioI purchased my first HD Radio, the Sony XDR-F1HD, in 2008.  The first HD Radio signal I received via Sporadic E was in May of that year, 97.5 KMOD Tulsa, OK, at 1045 miles away.  The distance didn’t matter–I knew it was KMOD the moment I tuned to 97.5 FM, since the station’s callsign flashed on my screen, as seen in the picture to the right.

Oops! Errors in the display

WKYS, 2008, HD RadioOccasionally, I would come across a station broadcasting an incorrect callsign in the early days of HD Radio, such as my local 93.9 WKYS identifying as “KHRS-FM” for the better part of one day in 2008.

Ironically, a friend of mine in the Houston, TX area found the same incorrect KHRS callsign on his local 97.5 FM, whose real callsign was KFNC, in 2011.  Other stations occasionally displayed some variant of “HD-FM” or “HDHD-FM” at some point, too.  Just like the appearance of the KHRS calls on multiple stations, the error was often quickly fixed to the correct callsign.  Even still, it posed an issue for listeners wondering the true identity of what station they had tuned in.

The move to name-based callsign displays

For a few years it was a given–if your radio decoded an IBOC signal, you could positively identify it with minimal effort.  Although the aforementioned errors were rare, things started to change in the first half of the 2010s.  During a Sporadic E opening in 2010, I received a callsign from an HD Radio signal that said “RRR.”  Knowing that “RRR” was not a valid United States callsign, I had to listen to the signal to see what it was and where it was coming from.  I quickly learned that “RRR” stood for “Red River Radio,” a public radio network in Texas and Louisiana.  The station itself was 88.9 KLDN Lufkin, TX.  A year later, I picked up a station identifying on my radio screen as “TROY-FM,” which was later found to be 88.7 WRWA Dothan, AL, a signal broadcasting from Troy University.

By 2015, the sheer majority of HD Radio signals I encountered both via DX and while traveling in other cities largely still had their actual callsign displayed when tuned in.   This slowly began to change.  I noticed more and more stations showing their station name instead of their callsigns when tuned to HD Radio, most notably stations named “Kiss FM.”  Instead of callsigns, the HD Radio displayed “KISS-FM” on many of these stations.

In the following years, many radio groups switched their entire portfolio of HD signals in certain markets from callsign displays to name displays.  It isn’t happening in every city in America, but it is common enough that most major cities have at least two or three stations now with name displays.

The phenomenon was most obvious in Pittsburgh, PA.  I first visited Pittsburgh in 2016 and established an extensive DX log during my stay.  At the time, 10 of the city’s HD Radio signals had callsign displays, while two (96.1 WKST & 104.7 WPGH) had name displays, “KISS-FM” and “BIG -FM,” respectively.

When I returned to the market in 2019, four more of the same stations that previously had callsign displays switched to name displays, bringing the total of stations utilizing name displays in the market to six.

Washington: A rarity in HD Radio markets

My local market of Washington, DC is unique in that all 21 HD Radio signals currently broadcasting still display their callsigns in their HD displays as of 2019.  None have name displays.  Even so, there have been many changes in exactly what callsign appears on each signal.

Over the years, most of the signals in Washington flip-flopped between displaying their callsign with the “-FM” prefix at the end, to simply displaying the four-letter callsign itself.  This had no bearing on if the station’s actual callsign legally had “-FM” as a part of it or not.

In 2018, three Washington signals had “-FM” at the end of their callsign display: 88.5 WAMU, 93.9 WKYS, and 102.3 WMMJ.

Less than a year later, these stations removed the “-FM.”

Interestingly enough, I also noticed local 96.3 WHUR’s usual HD Radio display was replaced with an errornous “HD” callsign on April 4, as seen on the right screenshot below.  I predict this will be fixed in the coming days.

My take

Personally, I prefer the actual station callsign to be always visible on HD Radio signals.  Although it is always amusing to see how creative station owners can get with fitting a station name into a four-digit “spot” on stations that do have name displays, I think that it takes away from the intended purpose of HD Radio in terms of being able to identify which signal is being received.  It also makes DXing much harder because there is the chance of a distant signal coming in and disappearing before it is identified–even if its IBOC signal is fully decoded.

My prediction: within the next few years, at least one Washington HD Radio signal will switch to a name-based digital screen ID.  We will see how right I am in the coming years.

Celebrating 20 years of FM DXing, 1999-2019

On an unsuspecting early morning in my teenage years, I tuned up and down on my radio, trying to find something to listen to. A song on a very clear radio station caught my ear, so I left my radio there and went back to what I was doing. The station identified as “Z104,” but something wasn’t right. The frequency was wrong: 104.5 FM. My local “Z104” with a similar format broadcasted on 104.1 FM. Was my radio broken?

I kept on listening to the station, not understanding why the DJ was giving a weather forecast for the “oceanfront.” I didn’t live near an ocean. A short time later, I heard the following legal ID blast out of my speakers:

I received my first DX signal, 104.5 WNVZ, on this Philips-Magnavox boombox in 1999.

I sat in my desk chair, eyeing the bright “104.5 MHz” on my radio’s screen as local commercials for the Virginia Beach area played one after another. Were my ears playing tricks on me? How could I be listening to something over 120 miles away, when it sounded just as clear as any typical local station? Intrigued, I tuned up and down the dial, finding more unfamiliar stations from Richmond, VA (75 miles away) and even more from the Norfolk area. I had an old portable TV in my closet, so on a hunch I pulled that out, and was even more surprised to find a chorus of strange TV stations coming in on all channels from central and southeastern Virginia. All of them aired the same things that I saw on my local TV stations, until the morning news came on.

Richmond’s channel 12, WWBT, was received for the first time as seen above in 1999 shortly after I heard WNVZ.

20 years ago today, my unexpected exposure to the hobby of DXing started all with my reception of WNVZ near Washington, DC. I found each night that reception was different–some nights Norfolk FM & TV would blare in, while at other nights, Ocean City, MD or Philadelphia, PA came in instead. It became second nature to write down all I was receiving so I’d remember what city everything was from, in the process creating a thoroughly-detailed DX log, which I keep updated to this day.

I wanted to look back at how DXing has changed since 1999. The basic principles of DXing have never changed (i.e. the need to identify unfamiliar signals), but the tools available now in 2019 to do so are much more advanced than what I had that morning when I first logged WNVZ.

Although the internet was operational in 1999, the resources needed to adequately identify signals for DXing purposes weren’t always there. Some great websites like Radio Locator and (now defunct) DXFM.com were invaluable resources for station data in the late 90s. Even so, many radio stations at the time had little to no web presence online.  Those that did often had outdated or incomplete information, such as no mention of the station’s slogan on their website.

WNVZ received again at my home with HD Radio in 2017.

The 2000s brought great change to the hobby.  RDS became commonplace by mid-decade, allowing many stations to be IDed by on-screen text.  HD Radio debuted locally in 2006, shuttering most open and usable frequencies immediately next to local FM stations, replacing the once empty frequencies with digital “sidebands” that blocked out all but the most strongest DX.  Sites like Yes.com provided lists of current songs playing, which was extremely helpful during Sporadic E openings, and DXers came in droves to online propagation loggers like the TV/FM Skip Log, which helped spread the word for signal propagation events.  The technological innovations stagnated in the 2010s, with the only major change in FM DXing being an almost annual downturn in occurrence of Sporadic E openings, new stations turning on HD Radio broadcasts (and many more discontinuing the service), and the few open frequencies being taken up by new translators seemingly popping up every day.

Even with all of these changes that were both a benefit and a detriment the hobby over the years, I still somehow managed to garner 1910 unique FM logs and 222 TV station logs.

Hopefully we’ll be all around for me to announce my 40th FM DXing anniversary in 2039.  Stay tuned!  The dial is always changing.


UPDATED: Washington, DC’s 107.3 WRQX to flip to Christian Contemporary in major multi-market station deal

Updated 5/31/19 – WRQX has flipped to “K-Love” and is now WSOM.  The callsign will change to WLVW soon.  Click here to read my full story and to hear the format flip.

Updated 3/2/19 – Some new developments in the WRQX/EMF sale, according to online reports:

  1. The actual format flip will apparently happen in summer 2019 when the transaction closes, not March 1 as previously thought.
  2. WRQX and the other stations below will very likely get the “K-Love” format instead of “Air 1” or “K-Love Classics.”
  3. The “Mix” branding and WRQX calls will stay with Cumulus, meaning they could reuse the combination in another market, or they could resurrect WRQX as “Mix” on co-owned 105.9 WMAL in DC after the deal closes.  This also guarantees that 107.3 will get a new callsign this summer, the first new callsign for the station in over 40 years.

A radio deal between Educational Media Foundation (“EMF”) and Cumulus Media will result in six major United States cities getting a new Christian radio station.  Among the stations announced February 14 include 107.3 WRQX Washington, DC, a local radio station of mine.

The move also marks the second time within a year that a radio station in the Washington market has ditched the hot adult contemporary format, after cross-town 94.7 WIAD flipped to classic hits in October.

WRQX, along with five other stations in New York, NY (95.5 WPLJ), Atlanta, GA (106.7 WYAY), San Francisco (97.7 KFFG), Savannah, GA (102.1 WZAT), and Syracuse, NY (105.9 WXTL), will become EMF stations this summer, according to press releases from both Cumulus and EMF, linked here from RadioInsight.com.  Although seemingly not related to the EMF deal, Cumulus also said in their release that they will swap ownership of stations in Indiana, Massachusetts, and New York with Entercom.

EMF runs three Christian Contemporary networks: AC-leaning “K-Love”, CHR “Air 1,” and “K-Love Classics,” which airs recurrent songs from previous decades.  It is unclear exactly which network WRQX and the other signals will pick up.

RadioInsight.com did a great job of reporting on how the shockwaves from this deal will reverberate throughout the radio industry.  I decided to take a look at the deal’s immediate effect on the Washington, DC radio market, as well as how it will affect DXers in the Mid-Atlantic area in range of WRQX.

HD Radio decoded from WRQX, 4/15/18

For years, the main Christian Contemporary (“CCM”) radio outlet in the Washington, DC area has been 91.9 WGTS Takoma Park, MD.  Listeners in Northern Virginia also had access to the “Your PER” network of simulcasted CCM signals (89.9 WPIR Culpeper, VA, 90.5 WPER Fredericksburg, VA, and a chorus of translators throughout Virginia), while those in the Maryland suburbs of DC can hear nearby Baltimore, MD’s “95.1 Shine FM” WRBS.  DC’s 105.1 WAVA Arlington, VA, which airs spoken religious programming, occasionally airs CCM music.

Even with suburban and distant signals offering the same format, WGTS was the go-to place for Christian music in Washington.  I always see WGTS bumper stickers on cars and advertisements on buses, a nod to the station’s popularity.  Introducing K-Love to this “one-horse town” will likely drive listeners away from WGTS, WRBS, and the “PER” network, especially if listeners are familiar with K-Love from being in other cities where it can be heard.

Once WRQX flips, there will be no hot AC radio station in Washington.  The closest the city will have to the format will be adult contemporary 97.1 WASH, which airs more 80s music and less upbeat songs compared to what Mix plays.  It will be interesting to see if another station in Washington picks up the hot AC format to fill the void.  The closest stations with an hot AC format are 101.9 WLIF in Baltimore, MD (42 miles from DC), Fredericksburg, VA’s 101.5 WBQB at 45 miles, and Winchester, VA’s 92.5 WINC, at 54 miles away from the city.  Neither WLIF, WBQB, or WINC make it into office buildings and businesses in downtown Washington, where many doctors offices and businesses play the format in waiting rooms.  I predict WASH will win this battle, unless offices migrate to more upbeat signals, like CHR 99.5 WIHT.

WRQX has had a long span of consistent formats over the years.  From 1979-1990, the station was CHR “Q107.”  It was hot AC “Mix 107.3” from 1990-2013, and again 2015-today.  The signal was CHR with a slew of names (“All The Hits 107-3” and “DC’s 107-3,” to name a few) between 2013-2015.  Ironically, after the flip, WRQX will be in competition once again with WAVA, something that hasn’t happened in the market since WAVA was also CHR in the 1980s.

EMF purchasing WRQX makes sense.  Save for a translator here and there, K-Love was largely absent from the Washington, DC region until 2017, when EMF bought nearby 94.3 WWXX and flipped it to K-Love.  The station, now WLZV, broadcasts 2 KW in a rural area 45 miles southwest of Washington and cannot be heard in the city due to a local LPFM on 94.3.  If EMF wanted to penetrate the DC market, they needed to do it on another signal, and WRQX was a logical choice, given how its 19.5 KW signal reaches the entire DC area, including the mountainous areas to the west, with ease.  I’ve seen WRQX’s ratings slip over the years, so if a sale was to happen, it likely would’ve been a station like WRQX, instead of high-rated 103.5 WTOP or 96.3 WHUR.

From a DXing perspective, WRQX’s flip is actually good news.  I often get K-Love signals via tropo or Sporadic E propagation, and it is good to have a local signal to quickly compare songs heard on distant signals to during DX events.  It saves me from having to tune in the K-Love audio stream each time a suspected K-Love signal is heard.

The downside is that since K-Love is a nationally-broadcasted network of stations, the only local content heard is the top-of-the-hour legal ID.  This is in stark contrast to the current WRQX, which has local DJs and other local content after every song.  And, of course, the fact that employees both on-air and behind-the-scenes at WRQX will likely all lose their jobs after EMF takes control is unsettling.

It is unclear if WRQX will get new call letters with the format flip, but several online sources have hinted that the calls will change next month.  My prediction is that WRQX will air K-Love, and the call letters will be something like WLVD or WLVW (the latter being currently on a K-Love station in Maryland, but the calls can always be moved).  We’ll see how right I am in the coming weeks.


New FM radio dial scan video from Woodbridge, VA

After realizing that my dial scan video on my Local FM Stations page was almost nine years old, I decided it was time to update the video, using my recently-acquired Sangean HDR-14.  This video shows an accurate representation of signals received at my home without tropospheric enhancement.

The new video above from 2019 has been added to my Local FM Stations page.  You can still find the old 2010 dial scan video and other radio and TV DXing-related videos on my YouTube channel.

2018 FM E-Skip Year in Review

review_2018It started out with a bang but ended without fanfare.  The 2018 Sporadic E-Skip Season is no more, but even though this season has failed to live up to what I thought it would be, I still feel like it was a step in the right direction.

Sporadic E is a method of signal propagation that, when in effect, allows broadcast signals to be received up to 1500 miles away with clear local reception. It can happen any time of the year, but it is most common during the summer months.

When I started to monitor daily for FM Es in 2006, living in the summer months usually meant having to plan everything around an always-present Sporadic E opening.  I’ve turned down social invitations and put off errands countless times because a mammoth FM Es opening was brewing on the dial.  Beginning in 2009, Sporadic E came in less and less, getting progressively got worse each year until it hit a lowpoint in 2017, where I only received 33 minutes total of Sporadic E the entire season — compared to 1471 minutes in 2014.


On the surface, 2018 seemed to be the first skip season in years where things started to turn around.  This year, I received 347 total minutes of skip with 5 new FM logs from 8 openings.  During this season, I logged my 1900th FM station, and 4 of my 5 new FM logs were received from one unattended opening on 6/6/18.

I was on vacation on June 16-24, 2018.  During that time I had two FM Es openings: one on 6/20/18 while I was outside of New York, NY, which lasted 100 minutes and brought in 26 stations from the Midwest and Upper Midwest.  This opening was very strong, with many distant signals toppling the local NYC FM stations in a manner that I haven’t seen since 2016.  Another respectable opening into the same general area was also observed on 6/26/18 while I was in Providence, RI, with a few RDS decodes but not as strong as the NYC opening.  Within the same time period and weeks thereafter, reports of top-of-the-band FM Es from other DXers flooded into

WWFD 820 AM goes all-digital in Frederick, MD

DCRTV and Radio-Online report that an AM station in the Washington, DC region has ceased analog broadcasting, becoming the first radio station in the United States to solely broadcast in digital HD Radio.

WWFD 820 Frederick, MD, which airs an AAA format as “The Gamut,” flipped the all-IBOC switch on July 16.  Since I am too far away from WWFD to receive it, I cannot verify if the station simply removed its analog frequency from its broadcast, leaving its existing digital sidebands, or if the station is broadcasting a full power digital signal on its center frequency.

The station’s move to all-digital poses an interesting situation for DXers, as it appears now that at least AM stations can apply to go all-digital.  Does this mean FM stations are next?  I wrote about the possibility of an all-digital FM band in 2013.  In that article, I predicted that such a move would both benefit and hurt the DXing hobby.  For those who aren’t familiar with the mechanics of HD Radio, a station on 95.5 FM running IBOC broadcasts its analog signal on 95.5, and its digital signal (at a lower power) on 95.3 and 95.7.  These adjacent digital “sidebands” ruin DX, as it blocks out all but the strongest distant stations on the frequencies immediately next to a local signal running HD Radio.

If the HD Radio standard supports one sole full power digital signal on the center frequency (i.e. a full power digital 95.5 FM and nothing on 95.3 and 95.7 FM), then this could positively revolutionize FM DXing, as these adjacent-to-local frequencies would, once again, be open to any DX, much like it was prior to the debut of IBOC.  On the other hand, if the FM band became digital-only, a very strong signal would be required to receive any radio station (rendering weak signals invisible to an HD Radio), much like what one experiences with digital TV DXing.

It remains to be seen if WWFD’s digital transition is the first of many to come, or if it is a one-off occurrence.