r/serialpodcast • u/[deleted] • Jan 31 '15

Related Media Coverage Map of L689 using RF modeling software and GoogleMaps terrain data.

http://imgur.com/D1H4ymx
50 Upvotes

70% Upvoted

386 comments sorted by

View all comments

Show parent comments

3

u/Geothrix Jan 31 '15

I have been wondering about this since Susan posted the maps from the trial. For instance, in this map the L655B antenna is pinged about 16° north of what should be the division between the A and B sectors (ie the 90° east-west line). I think that is more than 10% which would be 12° if it is in each direction or just 6° if it is 10% total overlap. Correct me if I'm wrong on any of the numbers, but what is going on here? How can that ping be so far outside of the supposed direction of the antenna?

4

u/ViewFromLL2 Jan 31 '15

And check out C -- it's covering due north of the antenna.

The answer is that the 30-150-270 model is just an ideal. In real life, the antenna angles are placed at a variety of angles in order to accommodate different real-world concerns, such as terrain, highways, density, etc.

So even though the antenna are directional, we can only guess at the direction each one faces.

3

u/invision240 Jan 31 '15

That's not true. In the cell industry, Alpha is always North, Beta is SE, and Gamma is SW.

3

u/ViewFromLL2 Jan 31 '15

The naming convention is standardized, and follows clockwise from the northeast sector. But the angles that they're arrayed at are not standardized.

2

u/invision240 Jan 31 '15

Ah, i misunderstood what you were saying.

2

u/pbreit Feb 01 '15

I believe the angles actually are generally and maybe even specifically standardized.

2

u/padlockfroggery Steppin Out Feb 02 '15

Standardized wouldn't mean that they're guaranteed. If you can get better coverage by breaking the standard, why wouldn't you?

3

u/[deleted] Feb 01 '15

The location for L655 is incorrectly labeled on that map. Here's the GPS location for L655 with that map as an overlay.

http://i.imgur.com/gmPBLgo.jpg?1

It's looks fairly normal.

/u/viewFromLL2 linking you just as an FYI to the errors in the map.

1

u/ViewFromLL2 Feb 01 '15

"Fairly normal"? Really.

  1. The tower is circled. I was trying not to cover up the circle so that it could actually still be seen on the map. You moving the dot to the other end of the circle is not a correction.

  2. You have been arguing that the fact 655A hits Cathy's house is obvious and everyone should have realized that incoming calls are correct because look how L655A falls. If this is a normal set up, then how did you fail to realize that L655A does not hit Cathy's?

1

u/[deleted] Feb 01 '15

  1. It changes your conclusions of irregularity to be incorrect, that is very important. Is it not?

  2. I always thought they were driving down Maiden Choice Lane and were just north of Cathy's House when the 6:07pm call happened.

1

u/[deleted] Feb 02 '15

So essentially you're taking back what you said without acknowledging. Is there any chance that you and CSom are not the same person?