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Pirates captured

Posted: Wed Oct 18, 2017 11:46 am
by Shane
This excerpt is from Radio Ink:
Dony Joseph and Ali Isnor, Good Guyz Painting & Pressure Cleaning LLC, Pompano Beach, Florida at 98.5.
Delray Beach Investments in Delray Beach, Florida on 104.7 in Delray Beach.
Dominique Jean Louis of Lauderdale Lakes, Florida on 106.3 in Lauderdale Lakes.
Elizabeth Plaisime of Delray Beach, Florida on 95.1 in Delray Beach.
Jean Dumay of Sunrise, Florida on 92.7 in Sunrise.

Acerome Jean Charles and Concord Promo of Mattapan, Massachusetts on the frequency 100.1 in Brockton, Massachusetts.
New Fellowship Baptist Church in Dorchester, Massachusetts on 105.3 in Dorchester.
Patrick Jean Romain of Dorchester Center, Massachusetts on 90.1 in Mattapan, Massachusetts.
Michelle Joseph of Dorchester Center, Massachusetts on 105.3 in Dorchester.
Quinton Joseph of Dorchester Center, Massachusetts on 105.3 in Dorchester.
Dominique Donna of Randolph, Massachusetts on 92.1 in Randolph.
Tracy Wetmore of Everett, Massachusetts on 97.9 in Everett.

Geraldine B. Ballentine of Hackensack, New Jersey on 90.5 in Hackensack.
Kimberley Baptiste of Brooklyn, New York on 99.3 in Brooklyn.

Re: Pirates captured

Posted: Wed Oct 18, 2017 7:32 pm
by Deep Thought
Arrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrr

I have a difficult time taking this new-found enforcement backbone seriously when there are so many licensed stations operating illegally that they conveniently ignore. Those cause far more interference than your average pirate.

Re: Pirates captured

Posted: Thu Oct 19, 2017 3:45 pm
by kkiddkkidd
Deep Thought wrote:
Wed Oct 18, 2017 7:32 pm
Arrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrr

I have a difficult time taking this new-found enforcement backbone seriously when there are so many licensed stations operating illegally that they conveniently ignore. Those cause far more interference than your average pirate.
Ain't that the truth. I have just today been asked to investigate an xlator that is causing interference inside a full power station's 60dbu about 20km outside the back side of the highly directional xlator's 40dbu contour (as calculated by radio-locator). Not yet ready to say that it is malicious but their coverage seems to be magnitudes better off the backside of the crossed yagi than it should be.

Re: Pirates captured

Posted: Fri Oct 20, 2017 3:34 pm
by Lee_Wheeler
The problem with the "off the shelf" directionals is that they in no way take the actual structure into account. The installer, however, can take the structure into account and play games accordingly. I have seen one that had a standoff built and oriented the antenna so that is was more or less aiming down the face of the tower from the back side rather than being pointed off the leg. It appeared that the orientation was more or less correct but the pattern was certainly nothing like the book pattern.

The problem with all of this is proving it. FIM-71 readings from the ground are pretty meaningless.


...Lee

Re: Pirates captured

Posted: Fri Oct 20, 2017 6:07 pm
by kkiddkkidd
Lee_Wheeler wrote:
Fri Oct 20, 2017 3:34 pm
The problem with the "off the shelf" directionals is that they in no way take the actual structure into account. The installer, however, can take the structure into account and play games accordingly. I have seen one that had a standoff built and oriented the antenna so that is was more or less aiming down the face of the tower from the back side rather than being pointed off the leg. It appeared that the orientation was more or less correct but the pattern was certainly nothing like the book pattern.

The problem with all of this is proving it. FIM-71 readings from the ground are pretty meaningless.


...Lee
This is supposed to be a Scala CA2/CP mounted on a pole on top of the tower. The only way that I can model enough signal strength in the area of the complaints is either the yagi is pointed that direction or has been replaced with a ND. I know the tower guy that installed it and have no doubt that he installed it as licensed but don't have any idea who (or what) might have happened since. My client thinks that the xlator had been operating for a year or so before the interference started.

Re: Pirates captured

Posted: Sat Oct 21, 2017 10:27 pm
by Deep Thought
Lee_Wheeler wrote:
Fri Oct 20, 2017 3:34 pm
The problem with all of this is proving it. FIM-71 readings from the ground are pretty meaningless.
Drone measurements are fairly accurate. The convergence of UAVs and SDRs have made relative pattern measurements fairly easy.

Re: Pirates captured

Posted: Sun Oct 22, 2017 6:58 am
by w9wi
(There was an interesting presentation on that topic at the Broadcaster's Clinic two weeks ago. He mentioned (but hadn't tried) another interesting application -- flying a thermal imaging camera to check for transmission line and antenna hotspots.)

Re: Pirates captured

Posted: Mon Oct 23, 2017 11:51 am
by Dale H. Cook
I just got the first drone view of the antenna of a station that I am involved with. It is an LPFM still under construction that I am advising, and donating some labor to, as they are a 501(c)(3).

Re: Pirates captured

Posted: Tue Oct 24, 2017 2:36 pm
by kkiddkkidd
w9wi wrote:
Sun Oct 22, 2017 6:58 am
(There was an interesting presentation on that topic at the Broadcaster's Clinic two weeks ago. He mentioned (but hadn't tried) another interesting application -- flying a thermal imaging camera to check for transmission line and antenna hotspots.)
I wish that I could do that with my Phantom3. It would easily carry an android with something like a Seek thermal imager attached but you would literally be shooting in the dark with no live video.

The last time that I looked, a decent thermal camera upgrade for my air craft was about $4k.

Re: Pirates captured

Posted: Tue Oct 24, 2017 3:14 pm
by w9wi
His drone was homemade. He was flying a SDR and a Raspberry Pi. We have a couple of Phantom 4's here at WSMV - I'm of the impression this guy's drone has far more capacity than a Phantom 4.

Re: Pirates captured

Posted: Wed Nov 22, 2017 5:57 am
by AshleyCuneo
What a report! I am under impression, honestly speaking! That is why I decided to put my two cents in!

Re: Pirates captured

Posted: Wed Nov 22, 2017 1:35 pm
by kkiddkkidd
UPDATE TO MY XLATOR INTERFERENCE SAGA POSTED EARLIER...

Yesterday I finally got a nice day with nothing much better to do other than chase around middle TN looking at FM signal strengths and antennas... I used a 1/4 wave FM vert mag mount and a Pira P275 for relative measurements.

Imagine my surprise when I ran into signal strengths consistent with a calculated 60dBu contour about 8 miles away from the back side of the Scala CA2/CP and over 3 miles outside the FCC 60dBu.

Imagine my extreme surprise when I found 60dBu signal strengths in both of the deep side nulls again at about 8 miles away from the site. AND about 6 miles outside the FCC 60dBu contour.

Imagine me not being surprised to find that the signal in what should have been the main lobe was again consistent with 60dBu at about 8 miles instead of the 15 miles that it should have been.

Imagine my surprise to see what appears to be a 2 bay OMB GP-2 up where the Scala is supposed to be... I couldn't see any sign of the little CA2. There is no other FM license on that tower in the FCC database.

Earlier I had guessed that someone had kicked the CA2 around toward a much more populated area OR had put up an omni. Just looking at the signal strengths and listening to the coverage, I also now think that they are running overpower but how much would be up for debate. I have got to get closer to the tower or get a long, long lens to get pictures. I could see pretty clearly with my spotting scope but my pictures are fuzzy and inconclusive. I could have put up my drone but traffic was whistling by on narrow 2-lane road and I was parked in private driveways. The closest point that I could approach without walking across private property is just over .5 mile.

I am going back next week with some long glass and my drone to document. I want to make 100% sure that the CA2 isn't up there somewhere that I couldn't see.

Does anyone care to guess how much power it would take with a 2-bay w/ 7/8in line at about 100m to give an 8(ish) mile 60dBu omni contour?

Regards,

Re: Pirates captured

Posted: Wed Nov 22, 2017 1:42 pm
by Deep Thought
kkiddkkidd wrote:
Wed Nov 22, 2017 1:35 pm
Does anyone care to guess how much power it would take with a 2-bay w/ 7/8in line at about 100m to give an 8(ish) mile 60dBu omni contour?
Eff See See propagation tool sez 260 watts ERP at 100 meters gives a 60 dBu at about 13 KM (8.1 miles).

Two bay full spaced antenna would need somewhere in the vicinity of 350 watts TPO with 100 meters of 7/8" foam between the antenna and the TX to make 260 ERP.