Shortwave Broadcasting and the free press

WWCR wire rhombic antennas
WWCR wire rhombic antennas

Shortwave broadcasting is often overlooked as a domestic news outlet.  This is by design and is a throwback to the Cold War era when shortwave broadcasting was seen as an international propagation outlet, mainly used by the VOA.  In fact, according to the Smith-Mundt Act of 1948, the Voice of America is forbidden to broadcast directly to American citizens. The intent of the legislation is to protect the American public from propaganda actions by its own government.  Nice, huh?

WRMI corner reflector
WRMI corner reflector

The way the FCC rules governing shortwave (AKA HF) broadcasting are written, the station needs to be designed and configured to transmit signals to areas outside of the US.  Any coverage within the US is considered incidental.  See also CFR 47 73 part F.

WRMI signal 50 KW 9350 KHz
WRMI signal 50 KW 9950 KHz

That being said, many of the non-VOA HF broadcasters are well-received in the US.  There is nothing that is preventing a shortwave station on the west coast from beaming its signal across the North American continent to Europe, or over the poles, etc.  These stations’ call signs start with a K or W much the same as FM and AM broadcasting stations.  Most of them are religious broadcasters, however, there are a few that offer non-religious programming or a mixture of both.

As Clear Channel lays off more staff and becomes a computer-automated shell, I am beginning to think that traditional AM and FM broadcasting is on the way out.  Television news and the 24-hour news cycle have blurred the line between journalism and opinion.  Newspapers have filled the role of government watchdogs and general information sources since this country was founded.  Newspapers have fallen on hard times with many cutting investigative reporters, general reporters and or going out of business.  The internet has become the de facto information source for many people, which is fine so long as users understand its limits.

The big problem with all of this is the internet is a fragile thing, controlled by a few very large companies.  A few keystrokes and a router table are re-written to exclude a site that might have detrimental information.  Distributed Denial of Service attacks have taken down Wikileaks for days.  Collateral Wikileaks-related damage occurred to Amazon.com, Visa, Mastercard and Paypal.  A few “persuasive” calls from an important government agency or official to an ISP or server company can easily take a site or multiple sites offline.   Search results can be skewed by search engines, or by large companies like BP did during the Gulf oil spill.

The FCC debates on so-called “net neutrality” have yet to produce any meaningful framework to avoid corporate and search engine censorship.  This also assumes that the government can justly regulate the internet, which, in this day and age is a stretch of the imagination.

All of this is leaving an information void.  As the saying goes, nature abhors a vacuum.

Enter Shortwave Radio.  Now, I’ll be the first to admit, there are a lot of strange things that can be heard in the shortwave broadcast band.  However, it one can separate the wheat from the chaff, some rewarding entertainment can be had.   Most of the non-government shortwave stations in the US are religious broadcasters.  There are at least three stations that offer time-brokered programs, some religious and some not.  WBCQ is always a good bet.  WRMI is offering more and more non-religious programming.  WWCR also has some general programming.  While government broadcasters like the BBC, CBC, and others have greatly curtailed their broadcasts to North America, this is not necessarily a bad thing, as other smaller broadcasters can be heard where the giants once roamed.

As solar cycle 24 heats up, the programming selections on any given day can vary widely. Radio Australia (ABC) has been booming in on 6020 KHz in the mornings around here.  They have an excellent country music program and I have been introduced to several songs and musicians that I would not have otherwise heard.  Today I heard a great show on Radio Australia Today about New Orleans, Ray Nagin, the aftermath of Hurricane Katrina, and lots of things that aren’t normally heard here in the US.

The key to shortwave listening is the receive antenna.  One particular MF/HF receive antenna is the K9AY loop.  I have had very good luck with that antenna on both standard and international broadcasts.  I have to say, I am finding fewer and fewer things to listen to on the AM band.  I have taken the opportunity to make a few circuit boards with a 10-12 dB preamp for controlling the pair of loops used in a K9AY array.  The preamp is based on a common base Norton design, which has low noise and moderate gain.  I use the preamp sparingly, the main reason for it is the 4 way hybrid splitter, which adds 6.2 dB of loss to the antenna output.  Still, I have noticed, especially on narrow bandwidth digital signals, that the preamp can mean the difference between decoding a signal or not.

I am making extras, K9AY antenna systems, preamps, receiver splitters, and other general shortwave receive systems, which I plan to offer for sale at a later date.  As they say, stay tuned.

The 100 amp fuse

I found this fuse in an old electrical panel that we were removing from the WICC generator shed.  This was the original service entrance for the site as it was built in 1932 or so.  The generator shed had a manual three pole two position transfer switch, which was fine back when a licensed transmitter engineer was on site whenever the station was on the air.  The generator, according to the old records I could find, was an upright 2-cylinder slow-speed engine with a belt-driven generator.  They were mounted on concrete pads about 5 feet apart.  The motor had a big flywheel that was hand-cranked with the compression off.  Once a good head of speed was built up with the hand crank, the compression lever was thrown and the engine would start.  Alternatively, the procedure was tried again.

That was all replaced in 1971 when the transmitter site underwent a major upgrade.  The old electrical service was bypassed and abandoned in place when a new meter and panel were installed in the transmitter building.  The old service seems to have been frozen in time, untouched for forty years.

Kirkman Engineering renewable fuse
Kirkman Engineering renewable fuse

This fuse is a Kirkman Engineering Company and has a manufacture date stamp of January 1945.  It is a replaceable link AKA “renewable” fuse.  It has “peak lag” links, which I think would be called “slow blow” today.  Peak lag may also indicate a large inductive load, which would lower the power factor.  What I find interesting is that someone, once upon a time, placed two 100 amp links in parallel, then crossed the 100 AMP label out and wrote “200” on the fuse body.

Kirkman Engineering fuse links
Kirkman Engineering fuse links

The problem with this setup is that the panel and wiring were all rated for 100 amps.  The wiring is #4 copper, and the transfer panel and switch are clearly labeled “100 amp, 3 pole.”  It would appear that the finger stock holding the upper blade in place was loose, causing the fuse body to overheat.  In fact, it became so heated that the case and the wood fiber holder were charred and missing.

Fortunately, there was never a fire.

The reason why we use properly sized fuses and breakers.

I Got The Air Conditioner Blues

Back in the day, when tube transmitters ruled the broadcast world, the common practice was to have a big cooling fan moving outside air through the transmitter building connected to a thermostat.  Temperature swings of 30 to 40 degrees were common, however, the tube rigs could handle almost any temperature that didn’t melt plastic or freeze water.

Today’s solid-state transmitters are not that rugged.  They like to have their rooms around 70 degrees +/- 10 degrees or so.  Not to mention the other computer-controlled equipment commonly found at a transmitter site.  Things like air chain processors, STLs, remote controls, etc.  So, lots of air conditioning is the norm, and with lots of air conditioning comes lots of maintenance.

Air handler air filters need to be checked and replaced often.  Condenser coils seem to attract every type of flying debris on the planet and need to be cleaned once, possibly twice per year depending on tree and weed species near the site.  Even with preventative maintenance, occasionally things like this happen:

AC condenser frozen dryer and piping
AC condenser frozen dryer and piping

Of course, the entire cooling coil inside is frozen solid.

This condenser is low on refrigerant, causing icing problems.  It has a slow leak somewhere and is about to be replaced.  Other reasons for this happening are malfunctioning or non-existent low ambient kit on the condenser fan.  Sometimes less than knowledgeable persons will install a 5-ton unit designed to run throughout the year but not take into account the effect of moving below-freezing air at high speed across the coils.  Insufficient air moving across the cooling coil will also cause this.  Insufficient airflow can be due to plugged air filters or clogged fan/blower blades.

This one is even better (same condenser unit):

AC condenser broken fan
AC condenser broken fan

The fan blade is sheared off and jammed into the condenser coil.  This happened during power transfer from generator power to commercial power.  Naturally, it was at 1 a.m. in the morning after a pole-mounted transformer had been replaced.  When the building transferred back to commercial power, I went outside to use the “bathroom” before my two-hour drive back home.  I thought I smelled something hot, you know that cooked paint/plastic smell, but couldn’t really track it down… the winds were kicking up and another thunderstorm was on the way.

The next afternoon, however, when the sun was up and the site was working on one air conditioner, the temperature alarm went off.  Upon arrival, I found the condenser breaker tripped, resetting it caused the building lights to dim.  The fan motor was shorted to the case.  I would theorize the aluminum fan blade suffered from metal fatigue, likely because the blades were not balanced causing a vibration.  When the power transfer occurred, there was just the right combination of torque and centripetal force to cause the blade to rip, and then lodge in the condenser coil.

The fan motor has been replaced, but I think it is time to replace the whole condenser unit, which will be expensive.

AC&R Gauge set
AC&R Gauge set

I found having a set of gauges to check the head pressure and suction is a good diagnostic tool to quickly pinpoint problems with HVAC units.  This way, when the HVAC tech shows up, you can quickly point him in the right direction.

The breaker keeps tripping…

This is yet another addition of the “Burned up Sh*t” collection:

GE 30 Amp 3 pole breaker
GE 30 Amp 3 pole breaker

It is a breaker from a 5-ton AC compressor.  Back in the bad old days when I was the Director of Engineering for a 28-station group Headquartered in Harrisburg, PA, I received a phone call from one of the local engineers.  He stated that the studio AC unit compressor had burned out again and the breaker kept tripping.  What did I think, asked him.  I thought perhaps he should dig a little deeper and determine why the breaker was tripping before throwing another AC compressor at it.  When are you coming to town again, he cheerfully inquired.

Okay, I get it.

I started by calling the HVAC company to inquire what had gone wrong with the compressors.  Winding shorted to the case for both units was the answer received.  It being July and mighty hot out, the various worker bees in the studio were feeling inconvenienced by the sweat in their eyes and dripping on their work, etc.  I called the local manager and asked for a hotel room, I’d be up tomorrow.  Then I called the HVAC guy back and asked in to meet me at the studio tomorrow afternoon.

Upon arrival the next morning, I found the fifth-floor studios to be hot, as reported.  I trip to the roof location proved to be hotter still.  I tested the voltages at the compressor unit with a DVM and everything looked good.  A trip down to the utility room found the electrical panel in reasonable shape.  Then the local engineering guy chimed in, “Oh yeah, I forgot to tell you, the breaker hums and gets hot when the compressor is on.”

It’s always that little bit of missing information…

I took the breaker out and sure enough, the fingers were all arched and nasty-looking.

I replaced the breaker, the HVAC guy showed up, with a new compressor and the studios began to cool off around 3 p.m.

Since then, I have specified Square D QO bolt-on breakers for new installations, especially for heavy loads like AC units, transmitters, and so on. They are a little more expensive, but in light of two AC compressors, the unscheduled trip out of town, and the grumbling staff, it is better to pay upfront for better equipment than to put up with preventable outages.