The CCA AM1000D

Still in use as the main transmitter after 42 years at WCKL 560 KHz, Catskill, NY.

CCA AM1000D transmitter, WCKL Catskill, NY
CCA AM1000D transmitter, WCKL Catskill, NY

The last seven years or so, it has not had much use, the station being caught in some strange LMA with Clear Channel, then sold to the Black United Fund of NY something or another. They basically had it dark, turning it on for a few days each year to as not to lose their license.  Finally, they LMA’d it to Family Broadcasting (not to be confused with Family Radio).  There are rumors of a sale, but it remains to be seen.

They have been broadcasting an eclectic, free-form programming style which appears to be the work of mostly volunteers.

The station was first licensed in 1970, thus this is the original transmitter:

CCA AM 1000D name plate, WCKL Catskill, NY
CCA AM 1000D nameplate, WCKL Catskill, NY

Towers are 446 feet tall, which works out to 90 degrees at 560 KHz.

WCKL 560 KHz antenna array
WCKL 560 KHz antenna array

The station is licensed to Catskill, but the transmitter site is located in Hudson, across the river. With the current ownership situation in flux, I would characterize the operation as “tenuous.”

The transmitter itself is a pretty simple high level modulation tube type transmitter.  It uses 4-400 tubes, like the RCA-BT1AR transmitters, and is built around a similar design, which makes sense as they were designed and built by former RCA engineers.  One of the CCA principles, Bernie Wise, still makes Energy Onix transmitters about 10 miles away in Valatie, NY.

Parts are fairly generic and still available.  Things like the modulation transformer may be harder to come by, however, Goodrich Electronics, Harbach Electronics, Energy Onix and others will be able to steer one in the right direction. I’d put up a schematic if I could find one.

I find these older tube-type transmitters often sing with modulation, especially the higher frequencies.  That sound and the soft sound of the blower moving air is the sound of radio, at least to me.

At a crossroads

This is a situation that is and will be playing out over and over throughout the country as the decay advances. W*** signed on the air in March 1963. I believe this is the original tower:

W??? tower
W*** tower

As you can clearly see from this picture, this tower has several problems. Aside from the loose guy wires, the rust, and general structural decay, it is bent in several places.  Currently, the forces are in equilibrium, but for how long, no one knows.  It is certainly not safe to climb.  At 144 feet, it is no longer required to be marked or lit, thus, over the years, the paint peeled, the weep holes filed up, and the guy wires rusted and loosened, which leaves us with the situation today.

At the transmitter building, there are other issues with the basement flooding, mold, etc.  Truth be told, this station makes no money on its own.  It would cost several tens of thousands of dollars to fix all these issues, and for what; a high end of the broadcast band class D AM station which has not shown up in the ratings for fifteen years.  Once upon a time, it was a surviving, perhaps not thriving, local radio station. Those times have long since passed.

The question is; what to do with it?  Sign it off and surrender the license?  Fix all the problems and continue to broadcast?  Donate it?  If so, who would take it?  Or, more likely, wait until the tower collapses and deal with it then.

I’d imagine that there are many others just like it dotting the country.  On the whole, the AM broadcasters that are viable would be better off if this dead wood was cut away and discarded.

Implementing MCDL (Modulation Dependent Carrier Level)

Since the FCC waved some of its rules regarding carrier power and carrier shift on the AM broadcast band, AM stations are now able to implement MCDL or DCC (Dynamic Carrier Control) technology to save money on their electric bills.  This technology has the potential to save tens of thousands of dollars for higher-powered AM stations (high power=greater than 10 KW carrier level).

On a standard AM broadcasting station, the carrier represents two-thirds of the energy being transmitted, with the modulation index containing the other one-third.  The carrier contains no information; it is simply there on the center frequency at the power level authorized by the station’s license.  Thus, if the carrier can be reduced without affecting the quality of the broadcast reception, it will reduce to the overall power consumption of the transmitter.  In areas where electric costs are high, the savings can be substantial.

There are various ways to accomplish this.  The first is called Dynamic Carrier Control (DCC), where the carrier voltage is reduced during moderate modulation levels (between 20-50%) and restored during peaks.  This reduces the output power during average modulation, restoring most of it during quiet periods and peaks.  The next is Dynamic Amplitude Modulation (DAM), which is similar to DCC.  The most savings will be noted with less heavily processed programming such as talk radio because the higher the average modulation density is, the less the MDCL circuit reduces the carrier voltage level.  The little graph in the diagram shows the reduction in the carrier voltage vs. modulation levels.

Nautel DAM block diagram, courtesy of Nautel, Ltd.
Nautel DAM block diagram, courtesy of Nautel, Ltd.

Finally, Amplitude Modulation Companding (AMC) reduces the voltage in both the carrier and modulation product during peaks.  This results in better savings for higher-density modulation indexes.  It is also the most transparent of the three schemes, as the carrier is restored to full power during periods of low or no modulation levels. During peak modulation, the reduction does not drop the power level below the un-modulated carrier level.  The little graph in the diagram shows the reduction in the carrier voltage vs. modulation levels.

Nautel AMC block diagram, courtesy of Nautel, Ltd
Nautel AMC block diagram, courtesy of Nautel, Ltd   

Nautel has done extensive work on MDCL and includes several algorithms in their NX series transmitters.  For older Nautel transmitter models such as ND, XL, XR, and the J-1000, there is an outboard exciter, which is in a one-rack unit chassis.  Older transmitters may need a simple field modification to create a DC-coupled audio input.  The cost for the upgrade is approximately $5,000 USD, however, check with the regional Nautel sales rep.

Once the system has been installed, there are several things to be aware of:

  1. Modulation monitors may not work properly, especially older units, which will show significant carrier shifts and have carrier alarms.   Belar AMMA-2 modulation monitor is specifically built to work with MDCL transmitters.
  2. When making field strength readings, the MDCL circuitry must be turned off to get accurate readings.
  3. For stations running IBOC, the amount of carrier power reduction may need to be experimented with, as the effect of the carrier reduction may cause the transmitter to exceed the NRSC mask.

Currently, only Nautel and Harris are selling MDCL transmitters.  I spent several minutes poking around the Harris website and looking through their product brochures for the DX series transmitters and no mention of DCC o MDCL was found.  I’d be happy to include any information from Harris if it were made available.

More news talk migrates to the FM band

Once a bastion of the AM dial, News and or News/Talk format radio stations seem to be springing up on the FM band more and more often.  The original premise for creating talk radio on the AM band was the lower bandwidth and reduced (or perception of reduced) fidelity when compared to the FM band lent itself to non-music programming.  The reality is that receiver manufacturers never carried through on the NRSC-2 technical improvements, and AM receivers reproduced thin, low-quality audio.  I digress, the story goes, the FM band was great for music and the AM band did well with information and talk.

Of course, there were always a few exceptions to those general rules, but for the most part, that pattern held true until about 2009 or 10.  That is when AM station’s programming began to be simulcast again (everything old is new again) on FM stations and HD-2 subchannels.   It would be interesting to examine why this is so and what it means to the radio business as a whole.

The general trend in the music industry has also been down.  This is important because record labels and the radio business used to go hand in hand.  Record labels had the job of separating the wheat from the chaff.  Those groups or artists that had the talent would be given recording contracts and airplay.  With exposure, they would become more known, sell more recordings, record more songs, etc until they peaked and began to decline.  Radio stations prospered under this arrangement because they took on none of the risks while getting huge vast quantities of program material to playback, and charging advertising fees for spaces within that programming.

So far so good.

Then, two things happened:

  1. The communications act of 1996
  2. The Internet

The communications act of 1996 forever changed the way the radio business was run in this country.  No longer were there several thousand individual stations, the most influential of which resided in markets #1 and #2.  Instead, there were conglomerations of stations run out of Atlanta, Fort Worth, and a dozen or so other medium-sized cities.  No longer were stations competing head to head and trying to be the best and serve their respective audiences; rather, station A was positioned against station B to erode some of its audience so that station C could get better national buys from big ad agencies.  No longer would possible controversial artists like the Indigo Girls get airplay on some groups.  Songs were sanitized against possible FCC indecency sanctions, morning shows became bland and safe, and radio on the whole became a lot less edgy as big corporate attorneys put the clamps on anything that would invite unwanted exposure.

The last great musical genre was the Grunge/Seattle Sound of the early 1990s.  Those bands somehow mixed heavy metal, obscure mumbled lyrics, flannel shirts, and ripped jeans into something that the dissatisfied Gen Xers could understand and appreciate.  By 1996, this had morphed into “Modern Rock,” and carried on for several years after that, to fade out in the early 00’s.  Since that time, there have been no great musical innovations, at least on the creative side, other than the ubiquitous Apple computer and Pro Sound Tools software.

The internet greatly changed the way recording labels did business, mainly by eating into their bottom line.  This had the effect of circling the wagons and throwing up a protective barrier against almost all innovations.  The net result was fewer and fewer talented artists being able to record, which pushed those people into smaller, sometimes home-based recording studios.  While those studios can put out good or sometimes even excellent material, often the recordings lack the professional touches that a highly trained recording engineer can add.  Add to this the mass input of the internet and no longer are bands or artists pre-screened.  Some may point to that as a good development with more variety available for the average person.  Perhaps, but the average person does not have time to go through and find good music to download from the iTunes store.  Thus, a break developed in the method of getting good, talented artists needed exposure.  Youtube has become one of the places to find new music, but it is still a chore to wade through all the selections.

Thus, when FM HD-2 channels came into being, there was little new programming to be put into play.  HD radio was left to broadcast existing material with reduced coverage and quality than that of analog FM.  That trend continues today where now analog FM channels are being used to broadcast the news/talk programming that used to reign on AM.

What will happen next?  If Tim Westergren has any say, the internet (namely Pandora) will take over and terrestrial radio will cease to exist.  Current trends point solidly in that direction, although I think Tim is a little ahead of himself in his prediction.

News/Talk on the FM dial point not to an attempt to shift the wheezing, white, (C)onservative/(R)epublican programming to a younger demographic, who will, if I am any judge of history, remain unimpressed.  No, rather, they are running out of other source material, simulcasting syndicated talk radio is cheap, lean, and a good way to make money without having to pay actual salaries.