Radio interference from towers.
#1
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Radio interference from towers.
I have had several hits while flying at my field and have crashed some planes. I am running 72 MHz radios, is the any chance I could be getting some bad interference? I'm not the only one that has had this problem at my field. I can see 4 towers from the field. Is there any way to check this?
#2
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Use this link: http://www.antennasearch.com/
It'll list all towers and antennas with a 4 mile radius of the address you type in. You then look at each tower and find out if it has a transmitter on 72 MHZ. These FCC LEGAL transmitters are primary users and we as R/C pilots use the secondary channels between the legal ones.
If your radio system is slightly off frequency, it has a chance of listening to the LEGAL transmitter rather than yours.
My advise? Switch to 2.4 GHZ ASAP!!!
It'll list all towers and antennas with a 4 mile radius of the address you type in. You then look at each tower and find out if it has a transmitter on 72 MHZ. These FCC LEGAL transmitters are primary users and we as R/C pilots use the secondary channels between the legal ones.
If your radio system is slightly off frequency, it has a chance of listening to the LEGAL transmitter rather than yours.
My advise? Switch to 2.4 GHZ ASAP!!!
Last edited by pettit; 10-29-2013 at 03:23 AM.
#3
Senior Member
If the electrical field is high enough it can saturate the AVC (automatic volume control) circuitry on any receiver (2.4GHz as well as 72MHz and others). This is highly unlikely but possible if you get very close to the transmitting antenna(s). All good receivers have an AVC circuit else you could not have the variable range on your low powered rig.
#5
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There have been some instances on 72 and a few unexplained on 2.4. There is a tower with cellular and microwave about 1-2 miles away and a building close-by that has a wireless alarm system. Some planes on 72 and 2.4 have been hit hard at times ...very few times but they have happened and all in the same location . I still have a few planes on 72 and only two have been hit ;one only gets a wobble for a second and then comes back while the other went crazy but was recoverable after gaining altitude away from the offending signals. So yes antennas,cellular,wireless,WIFI can affect radios.
#6
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After years and years of radio hits @ Sepulveda basin and theories galore,, it comes to light that a mean little man named John Kim was intentionally shooting people down. Funny thing was I was always nice to the guy and never had radio problems,, But other guys that made fun of him and gave him grief had issues over and over. Never discount a disgruntled ex club member or club outcast.
Good luck
Good luck
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I have had several hits while flying at my field and have crashed some planes. I am running 72 MHz radios, is the any chance I could be getting some bad interference? I'm not the only one that has had this problem at my field. I can see 4 towers from the field. Is there any way to check this?
#8
A friend and I were going to demonstrate RC flying to an acquaintance and his son. The guy had an open pasture about a mile from a 100 KW Am/FM transmitter tower site. My friend's plane was out of control from the moment it left the ground. It was only pure luck that got it back on the ground without damage. We were sure the transmitter towers over-powered his TX signals. Needles to say the demo was cancelled.
bhady
bhady