11/14/18 19:33:02 UTC
266.600 MHz
BETHLEHEM, PA
Pilot talking about descent to airport
 
11/14/18 17:58:49 UTC
234.55 MHz
TACOMA, WA
Bluetail working with west group
 
11/14/18 17:57:13 UTC
271.000 MHz
TACOMA, WA
Looking for TFR Center
 
11/14/18 17:56:12 UTC
234.55 MHz
TACOMA, WA
Bullseye. Hostile
 
11/14/18 15:10:42 UTC
248.65 MHz
CHILLICOTHE, OH
Ops in Buckeye/Brush Creek MOA
 

11/14/18 16:39:09 UTC
308.700 MHz
KGYH - ARNG OPS PTD - 41.3 308.7 REMARKS: ARNG OPS C803-299-5214 (GREENVILLE OPS) -AJ
 
11/14/18 16:19:06 UTC
39.950 MHz
per KFBG NOTAM: L0729/18 - AERODROME - FLIGHT STRIP 2 (PU895947) 3RD BN 82ND AVN REG WILL PROVIDE AIR TRAFFIC SERVICES FOR AIRCRAFT OPERATING IN THE VICINITY OF FLIGHT STRIP 2. UNIT WILL SET UP AN/TSQ-198B, TACTICAL TERMINAL CONTROL SYSTEM. ATC SERVICES WILL BE PROVIDED FROM 0800 TO 2200 LCL EACH DAY. OPERATIONAL FREQUENCIES WILL BE 336.500 (UHF) , 141.425 (VHF) AND 64.775 AND 39.950 (FM). ALL AIRCRAFT ARE PERMITTED AND ENCOURAGED TO USE FLIGHT STRIP 2, HOWEVER A MAXIMUM OF TWO AIRCRAFT AT A TIME ARE PERMITTED IN THE AREA. CREWS ARE TO BE VIGILANT DUE TO AN INCREASE IN PERSONNEL ON THE FLIGHT STRIP. 14 NOV 13:00 2018 UNTIL 16 NOV 03:00 2018. CREATED: 13 NOV 21:58 2018 -AJ
 
11/14/18 16:18:14 UTC
336.500 MHz
per KFBG NOTAM: L0729/18 - AERODROME - FLIGHT STRIP 2 (PU895947) 3RD BN 82ND AVN REG WILL PROVIDE AIR TRAFFIC SERVICES FOR AIRCRAFT OPERATING IN THE VICINITY OF FLIGHT STRIP 2. UNIT WILL SET UP AN/TSQ-198B, TACTICAL TERMINAL CONTROL SYSTEM. ATC SERVICES WILL BE PROVIDED FROM 0800 TO 2200 LCL EACH DAY. OPERATIONAL FREQUENCIES WILL BE 336.500 (UHF) , 141.425 (VHF) AND 64.775 AND 39.950 (FM). ALL AIRCRAFT ARE PERMITTED AND ENCOURAGED TO USE FLIGHT STRIP 2, HOWEVER A MAXIMUM OF TWO AIRCRAFT AT A TIME ARE PERMITTED IN THE AREA. CREWS ARE TO BE VIGILANT DUE TO AN INCREASE IN PERSONNEL ON THE FLIGHT STRIP. 14 NOV 13:00 2018 UNTIL 16 NOV 03:00 2018. CREATED: 13 NOV 21:58 2018 -AJ
 
11/07/18 22:30:58 UTC
284.550 MHz
?
 
11/07/18 22:11:53 UTC
399.850 MHz
?
 
11/07/18 21:53:22 UTC
377.100 MHz
la center?
 
11/07/18 21:51:49 UTC
357.150 MHz
?
 



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Build your own ADSB Mode S Antenna for about $7.00

In October 2013 I had purchased a cheap TV Dongle to use as an ADSB Mode-S radar system. You can read the original "how to" article by Clicking Here.

Since putting together the system I've been using a cheap scanner antenna in my attic. No more than 18' above ground level. It was enought to provide hours of fun. At any one time I could see around 30 (40 on busy days) aircraft's Mode-S data. Usually I would have 3-5 aircraft being plotted on the map via ADS-B.

I found an article on how to build a better ADS-B Mode-S antenna, I'm not going to go into the construction process here. I will provide a link to the article on building the antenna at the bottom of this article. In his contruction article he provides a video, please watch his video prior to building yours. His video will be of great help.

The antenna is called a Coaxial Collinear Antenna. His construction article will show you how to build a '4 Section' collinear. I started with the '4 Section', gave it a try and was impressed. The great thing with Coaxial Collinear Antennas is that you can made as many sections as you want. After seeing how 4 sections worked, I added another 4 sections, creating an 8 section antenna, and again saw a slight improvement (about 3dB over a 4 section).

The pictures below are of my 4 section antenna. For my first test I just hung the antenna in the window, top of the antenna was no more than 6' above ground level. While doing an "A/B" comparison between the attic scanner antenna and the new collinear antenna the difference was like night and day! Attic antenna at the time was only tracking 28 planes, my new collinear antenna was consistenly tracking about 10 more aircraft (remember new antenna not as high off the ground!).

Here is what I used to build my antenna. I just bought a 6' length of cable TV jumper cable and started by cutting off 1 of the F connectors. I let the other F connect attached, used a barrel connector to later connect the finished antenna to a length of RG-6 already in the attic leading to my shack. Not bad for only spending about $7.00!

Check for Full Size Picture




After finishing the 8 section antenna and mounting it in the attic I was in for a surprise. Preformance was terriable, I first thought I had lost all of my gain in the 50' section of RG-6 I was using to feed the Dongle. After scratching my head I decided to go back to the attic and move the antenna do a different location in the attic. WOW, what a difference. You need to remember that at 1090 MHz many things around the house or in your attic can act as a reflector causing strange things to have at the very high frequencies we're dealing with.

After moving the antenna about 4' that made all the difference in the world. Now I'm picking up an average of 60-70 planes at any one time on Mode-S. Usually plotting 10+ on the map display in ADS-B mode. On the original scanner antenna in the attic the best I could do is seeing planes about 60-65 miles out on ADS-B. In the picture below I'm now getting planes as far as 126 miles! Its now rare to have less than 10 on the ADS-B map. Before building the new antenna I never seen planes on ADS-B over the Gulf of Mexico, as you can see in the image below I can.

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In summary this antenna took me about an hour to build including testing and installing. It only cost about $7.00 in parts. It nearly doubled the amount of aircraft as well as the distance I was seeing aircraft. While an everyday scanner antenna in the attic did a fine job, this experiment proves that an antenna built for 1090 MHz will do a far better job!

To view the original construction article for this antenna please Click Here

I hope you've enjoyed this article.