radiowaves
Member
- Joined
- Sep 13, 2007
- Messages
- 41
Hey Group,
Had such good luck with this little 7 element yagi project, I thought I would share it with everyone.
First give everyone a little background.
Recently purchased a Pro 2052 and started monitoring military air, ect... Stumble across Freq of Nature's web page, which lists all ARTCC RCAG Frequencies across the USA. How Awesome!!!
http://freqofnature.net:8080/faa/index.php
The closest RCAG is about 25 miles LOS on 125.2 and 269.4 MHz, I found that the same TX/RX come from both frequencies. My Discone @ 30 feet wouldn't cut it, unless signals were enhanced, so I needed something with a little more gain. Receive from the local RCAG station was way better on 269.4 MHz, so that was my target frequency.
Used this neat yagi program on the net to calculate the yagi’s dimensions: http://vk5dj.mountgambier.org/Yagi/Yagi.html
Put in a target frequency of 270 MHz, selected a non-conductive boom and 5 total director elements. Program did its calculations and gave me a printout of all necessary measurements.
Materials used:
10’ piece of 1’’ plastic conduit (gray)
3 - 1’’ pvc end caps
1 - 1’’ pvc tee
6 - 36’’ (1/8’’) Brass welding rod
2 – 3’’ Hose Clamps
Quick-set JB Weld
After construction, I installed the antenna @ 30 feet on the tower and receive was well over my expectations. I’m able to hear the RCAG 100% of the time, plus I still hear air traffic talking to the Center on 125.2. I’m hearing another RCAG on 281.4 which is further away and a 150 MHz repeater off the back of the yagi @ 20 miles. The antenna is working perfectly and cost under $20 to build. In the future I might upgrade the RG6 running down to the scanner with LMR-400, but so far I don’t have a reason to do it.
If you have any questions, feel free to email me at: n0yk at wbsnet.org
Hope this helps anyone needing a boost on 270 MHz.
73,
Chad
N0YK
Had such good luck with this little 7 element yagi project, I thought I would share it with everyone.
First give everyone a little background.
Recently purchased a Pro 2052 and started monitoring military air, ect... Stumble across Freq of Nature's web page, which lists all ARTCC RCAG Frequencies across the USA. How Awesome!!!
http://freqofnature.net:8080/faa/index.php
The closest RCAG is about 25 miles LOS on 125.2 and 269.4 MHz, I found that the same TX/RX come from both frequencies. My Discone @ 30 feet wouldn't cut it, unless signals were enhanced, so I needed something with a little more gain. Receive from the local RCAG station was way better on 269.4 MHz, so that was my target frequency.
Used this neat yagi program on the net to calculate the yagi’s dimensions: http://vk5dj.mountgambier.org/Yagi/Yagi.html
Put in a target frequency of 270 MHz, selected a non-conductive boom and 5 total director elements. Program did its calculations and gave me a printout of all necessary measurements.
Materials used:
10’ piece of 1’’ plastic conduit (gray)
3 - 1’’ pvc end caps
1 - 1’’ pvc tee
6 - 36’’ (1/8’’) Brass welding rod
2 – 3’’ Hose Clamps
Quick-set JB Weld
After construction, I installed the antenna @ 30 feet on the tower and receive was well over my expectations. I’m able to hear the RCAG 100% of the time, plus I still hear air traffic talking to the Center on 125.2. I’m hearing another RCAG on 281.4 which is further away and a 150 MHz repeater off the back of the yagi @ 20 miles. The antenna is working perfectly and cost under $20 to build. In the future I might upgrade the RG6 running down to the scanner with LMR-400, but so far I don’t have a reason to do it.
If you have any questions, feel free to email me at: n0yk at wbsnet.org
Hope this helps anyone needing a boost on 270 MHz.
73,
Chad
N0YK