Carl Blare

We have talked recently about the problem of being prohibited to mount an antenna in a trailer park or apartment. One possible idea came to me just now, and I’ll share it.

We have talked recently about the problem of being prohibited to mount an antenna in a trailer park or apartment. One possible idea came to me just now, and I’ll share it.

Where is the nearest property line within sight of your location? If it is reasonably near by, think about contacted the property owner over on that side of the borderline and explain that you’d like to put an antenna right on the edge of their property. Maybe something can be worked out.

Then you’d get the signal over there by sending it on a studio-transmitter-link (STL), either FM, 49mHz or 900mHz, and put a solar collector on top or use a battery.

Maybe there’s a nearby flat roof-top that would allow a more secure location.

Probably most larger stations can’t have their antennas right at the studio, so you would be doing what they do…. relaying the programming to a remote transmitter site.

The Sangean ATS-505, a current vintage shortwave radio, contains a neatly attached listing of the SW Bands, and defines the 21-meter band as 13.560 to 13.870mHz, where I operate a Part 15 station at 13.560.

However, a member here on the site pointed this out to be an error and informed us we are actually on the 22-meter band. I’ve been in the process of re-recording all my station identification announcements.

But tonight while exploring a great newly discovered website

http://short-wave.info

I find that they list the 22-meter band as being 13.570 to 13.870mHz, which puts me back at 21-meters, saving all the trouble of re-recording.

That’s strange, I thought. It’s past midnight and the neighbor is wheeling his big trash can from the front to the back, and he’s been doing it a little at a time for over 20-minutes.

That’s strange, I thought. It’s past midnight and the neighbor is wheeling his big trash can from the front to the back, and he’s been doing it a little at a time for over 20-minutes.

So I checked into it, and the sound turned out to be thunder.

Back in March, Neil Radio8Z posted an in-depth paper on increasing the efficiency of the AM25 Ramsey transmitter.

http://www.part15.us/index.php?q=node/2714

Back in March, Neil Radio8Z posted an in-depth paper on increasing the efficiency of the AM25 Ramsey transmitter.

http://www.part15.us/index.php?q=node/2714

Even while working on many other projects, I have decided it is surgery time for the AM25.

It is hoped the AM25 can serve as a foot in the door to carrier current broadcasting. Admittedly this is not exactly what Neil had in mind, as his enhancements are geared toward a 3-meter antenna system, so we are taking a preliminary look see.

There is another off-site paper on enhancing the AM25 which seems primarily geared toward going well above 100mW so as to drive a carrier current system, with an interesting little coupler design.

http://teslapress.com/am25.html

An earlier forum/blog post is a pillar to Part 15 radio broadcast.

http://www.part15.us/index.php?q=node/2728

An earlier forum/blog post is a pillar to Part 15 radio broadcast.

http://www.part15.us/index.php?q=node/2728

On that link you will see PhilB’s declaration about “The Ultimate Part 15 Antenna.”

Next in line you’ll read a rebuttal from RFB defending the field of experimentation and discovery.

I must say that after experiences I’ve had so far here in the world I take both sides. I do not believe the two sides are an EITHER/OR situation.

I believe the two sides are an KNOWN/UNKNOWN situation.

The science demonstrated by PhilB is classic AM radio technology developed over the past century by full power radio broadcast.

The science dealt with here at part15.us is a different category precisely because it deals with indoor and low power situations, which were never the province of classic high power broadcast. It’s a different environment.

Therefore I hereby declare that PhilB’s Ultimate Antenna stands as the proven standard which has yet to be refuted by any new discoveries.

PhilB’s standard is absolutely necessary as a point of comparison for any new experimentation. That keeps RFB also correct in his view that perhaps some new finding will give us a way of designing an indoor or outer wall antenna that provides an acceptable result.

Hello from KDXradio.com, where Part 15 is a way of life.

Hello from KDXradio.com, where Part 15 is a way of life.

Last night we closed 1550kHz which was feeding the famed Southern Wintenna (window frame antenna) which served as a test site comparing our new AMT5000 with the AMT3000 which had been there for several years. The comparison tests are documented in a much visited thread on this same website.

We moved the AMT5000 to the front facing Northern Wintenna, much better located with hilltop exposure at 1680kHz to the neighborhood below. Another AMT3000 was removed from this location, giving us two AMT3000s that are out of service for now. The AMT5000 was tuned up and turned on, bringing a new “Part 15 gremlin” for us to wonder about.

On many radios in the building the signal from the AMT5000 has a deep hum, but we quickly proved the hum is not being generated by the transmitter itself, but somehow is only being heard on some nearby radios.

Taking our Grundig FR-200 portable radio on a good walk around, there are many locations where the signal on 1680 coming from the AMT5000 is perfectly quiet with no hum at all. Also of interest is the fact that the AMT3000 had no such hum artifact.

This particular kind of hum interference is described somewhere in the maze of site information, possibly from Radio 8Z or MRAM, and we’ll study what has been said.

Our shortwave transmitter, Big Talker, at 13.560mHz, has the same kind of hum accompaniment on some radios, but not others.

On a different but related subject, I found a perfect lamp (Lowes 14.95) for installation at the transmitter, which otherwise resides in a shadow. It is an LED lamp that looks like the spout of a lawn sprinkling can mounted on a thin gooseneck with a clamp that attaches firmly to a windowsill. The quality of light is perfect and I think every transmitter location needs one.

Slogan of the times: “Occupy 1680.”