June 2011
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The Onan RS-15000 Generator

It is a cute little thing. This one is being installed at a mountain top transmitter site for a class A WKIP-FM in Ellenville, NY.  It is way up in the air (at least by local standards) at 2,450 feet AMSL.  As such, the TPO is only 300 watts into a one bay antenna.  Therefore, even this little generator will be loafing along.  I added all the rack equipment up, both transmitters (main and backup), and the electric resistance heater and came up with a grand total of 6,300 watts.  The working load today was 3,200 watts, which I would assume is about average.

Onan RS-15000 at transmitter site with ice shield

Onan RS-15000 at transmitter site with ice shield

Denis, my sometimes helper, build an ice shield over the top of the unit with pressure treated wood.  This unit was placed about 40 feet away from the 140 foot tower, next to the concrete block building.  Still, on a windy day, I could see some chunks of ice flying off the tower in this direction.

It has a Lister/Petter 1900 cc engine, 1800 RPM, 240 volt split phase generator.  At 25% load, it burns 1.2 gallons of propane per hour.

Onan RS-15000 gaseous generator

Onan RS-15000 gaseous generator

This is annoying. The gas installer blocked access to one of the through holes in the bottom of the enclosure frame. Actually, more than annoying, downright annoying as it blocked the exact center of the hole.  I had to move the regulator up about two inches so I could run the 1 inch flex under the gas line.  This, in turn, led to some amount of swearing.

Gas supply to generator installed by selfish gas man

Gas supply to generator installed by selfish gas man or woman

Other side of the engine:

Lister petter 4 cylinder 1900 cc engine

Lister Petter 4 cylinder 1900 cc engine

Push rods going to rocker arms over the cylinders.  Low tech, under head cam engine. That’s okay, so long as it works when it is supposed to.

Onan RS-15000 generator wired to transmitter building

Onan RS-15000 generator wired to transmitter building

PVC conduit running into the transfer switch.  The final connection is made with liquid tight flexible metal conduit (FMC).  The control wiring is run in a separate 1/2 inch conduit, as required by NEC.

Engineering Radio is Two Years Old

Happy birthday to us! I was looking through the past posts of this blog and found much of it still relevant today. There were some older video posts where the videos are no longer available on youtube, those were deleted.

I continue to look for subjects to blog about while keeping the subject matter pertinent to broadcast engineering or some aspect of radio in general.  With so many things going on, this can be hard to do.

Here are a few stats:

  • Average daily page views: 400
  • Average unique visitors, daily: 240
  • Average returning visitors, daily: 37
  • RSS subscribers: 73
  • Total posts: 323
  • Total comments: 911
  • Total $pam comments: 52,403
  • Average number of comments per post: 2.8
  • Average number of $pam comments per post: 162

Which brings me to this; I use an aggressive $pam filter.  There is no way that I would be able to keep up with the number of junk comments received otherwise.  If you have posted a legitimate comment and it doesn’t show up after a period of time, e-mail me and I’ll look into it.  Chances are very good that some legitimate comments have been deleted by the $pam filter, for which I apologize.

Many of my unique visitors come from Google searches which is strange considering it’s page rank is 0/10.

I continue to enjoy blogging about the everyday life of a broadcast engineer and thank all of my readers and subscribers for their interest.  It is entertaining and enlightening to read all of your comments and e-mails.  For as long as there is interest, the writing project will proceed.



A pessimist sees the glass as half empty. An optimist sees the glass as half full. The engineer sees the glass as twice the size it needs to be.

Congress shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof; or abridging the freedom of speech, or of the press; or the right of the people peaceably to assemble, and to petition the Government for a redress of grievances.
~1st amendment to the United States Constitution

Any society that would give up a little liberty to gain a little security will deserve neither and lose both.
~Benjamin Franklin

The individual has always had to struggle to keep from being overwhelmed by the tribe. To be your own man is hard business. If you try it, you will be lonely often, and sometimes frightened. But no price is too high to pay for the privilege of owning yourself.
~Rudyard Kipling

Everyone has the right to freedom of opinion and expression; this right includes the freedom to hold opinions without interference and to seek, receive and impart information and ideas through any media and regardless of frontiers
~Universal Declaration Of Human Rights, Article 19

...radio was discovered, and not invented, and that these frequencies and principles were always in existence long before man was aware of them. Therefore, no one owns them. They are there as free as sunlight, which is a higher frequency form of the same energy.
~Alan Weiner

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