Close to Atlanta


#1

I live within 100 nautical miles of Atlanta Hartsfield Airport. When I look at the map from my feed data, I see a few planes around Atlanta but don’t see the swarm of flights that I can see on the main FlightAware web site. Should I expect to see those? I am thinking I should and am not sure why I don’t.

Thoughts? Suggestions?


#2

@kenbrow

(A) Your location
Determine what maximum distance you can reach from your location by following the instructions given in FIRST POST of this thread:

What is the Maximum Range I can Get?

(B) Your hardware (Please post following details)
(1) Antenna type

(2) Antenna location (indoor/outdoor on roof or tower)
(3) Length and type of Coax cable from antenna to receiver

(4) Type of Receiver (DVB-T/ProStick/ProStick +/Flightaware FlightFeeder etc)


#3

Thank you for the response!

My setup is as follows:

  1. Antenna: Flightaware 1090MHz ADS-B Antenna - 66cm / 26in
  2. Antenna Location: The antenna is up approximately 25’ on an outdoor mast.
  3. Coax: approximately 50’ of RG-58
  4. Receiver: FlightAware Pro Stick Plus ADS-B USB Receiver with Built-in Filter

As for Atlanta, I do see a few planes around Atlanta on all sides of the city but I do not see the steady streamof arrivals and departures that are ongoing.


#4

Here is my findimg from the “Max Range” site


#5

So, based on that coverage map, the Atlanta arrivals and departures are too low for my receiver to “see” them. That is a neat tool!


#6

Yes, heywhatsthat provides a very handy tool. One can easily know what he can get.

Due to line-of-sight nature of microwaves, and curvature of earth, the topography around antenna location is an important factor determining maximum range.

Raising your antenna may help. You can re-plot heywhatsthat curves using antenna heights 30 ft and 35 ft (instead of your existing 25 ft) to see how much benefit you will get by raising your antenna

If I recall correctly, RG58 has an attenuation of about 21 dB / 100 ft at 1000 Mhz. For 50 ft length you have, the attenuation in coax is about 10.5 dB. As the Flightaware ProStick has an 18 dB integral RF pre-amplifier, this 10.5 dB attenuation will be easily covered by it.

Another factor which can affect reception is presence of strong Cell phone signals, which can overload/saturate front-end of the receiver (ProStick). Adding a filter may resolve this issue.

Do you have Cell phone towers or building-top antennas in vicinity?

I live in Toronto urban area with lot of Cell phone antennas around. Below is the RF scan at my location.


#7

That’s correct, I am in the same situation with Washington DC (100nm). Too “far” to see the planes heading for landing or taking off, I can see only the ones passing above, at at least 12,000 ft.