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Radio Free Amerika The ins and outs of the radio frequency spectrum, including scanners, trackers, building your own transmitters, mixers, and antennas, station formats, frequencies, favorite pirate radio stations, the FCC, radio stories, working at radio stations, and more.

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 #1 
Old 2008-07-30, 04:27
Regular
 
Default I dont know how but my FM radio is picking up

My FM radio when tuned to 96.9 (Mhz?) at around Noon, will suddenly go static and I will hear things like:

"Altidude XXXXXXX ft, holding steady"
"Making approach"
"Cleared for landing?"


HOW COULD THIS BE HAPPENING?!
 #2 
Old 2008-07-30, 13:46
phmeworp phmeworp is offline
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Default Re: I dont know how but my FM radio is picking up

From the context of the 'traffic' you are hearing, it is quite obvious that the signal you are receiving is from an airplane.

Assuming your radio uses the standard 10.7 MHz IF, when you are tuned to 96.9 MHz there will be an image at 118.3 MHz which is within the aircraft communications band. Image = [target freq] + 2x [IF] or, in this case 96.9 + 2(10.7) = 118.3

The odd thing (or at least one of the odd things) is that aircraft communications are AM and your radio is FM. That does not eliminate the possibility of RF overload causing you to hear this in some garbled fashion, but given the relatively low power of aircraft transmitters, the plane would have to be pretty close to your radio, or you have a pretty un-wonderful front end!

The other possibility, of course, is that there is a ghost in your machine.
 #3 
Old 2008-07-31, 02:15
Regular
 
Staten Island New York (Ugh)
Default Re: I dont know how but my FM radio is picking up

I used to get the same shit with my pokemon walkie talkies, except I would pick up telephone conversations and police radios.
 #4 
Old 2008-07-31, 06:29
Moderator
 
Laramie, WY
Default Re: I dont know how but my FM radio is picking up

Quote:
Originally Posted by Jaguarstrike
I used to get the same shit with my pokemon walkie talkies, except I would pick up telephone conversations and police radios.


Telephone conversations wouldn't be too tough, since much of those things all operated in the 49Mhz range at one point. Police band would be dependent on your department's system, but it's conceivable you could get an image of their transmission.

Pokemon walkie talkies? I gotta get me some of those!
 #5 
Old 2008-07-31, 21:58
Regular
 
Yes
Default Re: I dont know how but my FM radio is picking up

that's so cool, i get people from deldot on these gmrs walkie-talkies I have.
 #6 
Old 2008-07-31, 23:10
AxisMundi AxisMundi is offline
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Default Re: I dont know how but my FM radio is picking up

That is very common... we can't listen to radios at work... we are about 300 yards from the ATC antennas... they bleed into EVERY station. You CAN listen to your radio, but you are constantly hearing the tower.
 #7 
Old 2008-08-01, 05:10
Regular
 
Default Re: I dont know how but my FM radio is picking up

Quote:
Originally Posted by phmeworp
From the context of the 'traffic' you are hearing, it is quite obvious that the signal you are receiving is from an airplane.

Assuming your radio uses the standard 10.7 MHz IF, when you are tuned to 96.9 MHz there will be an image at 118.3 MHz which is within the aircraft communications band. Image = [target freq] + 2x [IF] or, in this case 96.9 + 2(10.7) = 118.3

The odd thing (or at least one of the odd things) is that aircraft communications are AM and your radio is FM. That does not eliminate the possibility of RF overload causing you to hear this in some garbled fashion, but given the relatively low power of aircraft transmitters, the plane would have to be pretty close to your radio, or you have a pretty un-wonderful front end!

The other possibility, of course, is that there is a ghost in your machine.

I live right near an airforce base >_>

and no matter if I am on AM or FM bands, no matter what frequency, I will get a hideous noise every once in a while that goes a little like this " ECHA ECH ECHAH ECHA ECK" in rapid succesion.. Do you think it could be related?
 #8 
Old 2008-08-01, 05:27
Moderator
 
Laramie, WY
Default Re: I dont know how but my FM radio is picking up

Quote:
Originally Posted by Staples
that's so cool, i get people from deldot on these gmrs walkie-talkies I have.


That would be because they're probably using GRMS radios. There's nothing uncommon about picking up GRMS or FRS.
 #9 
Old 2008-09-22, 12:25
jjantzen13 jjantzen13 is offline
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Default Re: I dont know how but my FM radio is picking up

I used to pick up some HAM radio transmissions on occasion through my radio. That was until my neighbor finally died and his kids took his shit down. The dude was a dick, and when I asked him about it once, like some of the people he was talking to, he flipped on me on how I was spying on him and he was gonna call the police. No one missed him really. I remember his kids coming to empty his house, they just had a huge keg party, and whatever wasn't stolen or broken was sold the next day at a yard sale.
 #10 
Old 2008-10-20, 16:54
Regular
 
run while you can ----->
Default Re: I dont know how but my FM radio is picking up

My old walky talkies used to pick up amateur radio from the place on the hill behind my house(they had a huge antenna :))
 #11 
Old 2008-11-04, 13:50
Regular
 
the happy land of australia
Default Re: I dont know how but my FM radio is picking up

Quote:
Originally Posted by Jaguarstrike
I used to get the same shit with my pokemon walkie talkies, except I would pick up telephone conversations and police radios.


dude, pokemon?
 #12 
Old 2008-11-04, 20:42
jjantzen13 jjantzen13 is offline
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Default Re: I dont know how but my FM radio is picking up

dude, pokemon?

For sure. They run offa Pikachu-power instead of batteries.
 #13 
Old 2008-11-04, 21:13
Moderator
 
Laramie, WY
Default Re: I dont know how but my FM radio is picking up

For sure. They run offa Pikachu-power instead of batteries.

To charge them up, Ash just shoves them up Pikachu's ass.
 #14 
Old 2008-11-07, 22:42
Regular
 
Staten Island New York (Ugh)
Default Re: I dont know how but my FM radio is picking up

dude, pokemon?

I was like 10.
 #15 
Old 2008-11-11, 08:13
Regular
 
☭
Default Re: I dont know how but my FM radio is picking up

I live right near an airforce base >_>

and no matter if I am on AM or FM bands, no matter what frequency, I will get a hideous noise every once in a while that goes a little like this " ECHA ECH ECHAH ECHA ECK" in rapid succesion.. Do you think it could be related?

Probably just aliens.
 #16 
Old 2008-11-12, 14:49
TheSolitaryWarrior TheSolitaryWarrior is offline
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Default Re: I dont know how but my FM radio is picking up

To charge them up, Ash just shoves them up Pikachu's ass.

lol

Anyway, on the subject still...Does anyone know how you can modify a regular radio to be able to pick up certain transmissions like police and stuff, if thats possible I mean.
 #17 
Old 2008-11-24, 09:15
TheGreenDoctor TheGreenDoctor is offline
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Default Re: I dont know how but my FM radio is picking up

I remember at one point at night, from about 8pm onward, I could hear tv stations on my 8 track player at a real low frequency like 87.5. It was something in the VHF range, like channel 6 or 8.
 #18 
Old 2008-11-25, 17:11
Mr_T Mr_T is offline
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Default Re: I dont know how but my FM radio is picking up

Something that may sound weird, I live near macdill airforce base(across the bay in pinellas) when i'm out side with a simple hand radio I can listen into their MP's talking over the radio. It's weird and cool too, when I go in to buy shit I can tell them things no one besides them know.
 #19 
Old 2008-11-25, 17:40
TheSolitaryWarrior TheSolitaryWarrior is offline
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Default Re: I dont know how but my FM radio is picking up

I once picked up a conversation between two aliens through a metal coathanger.
 #20 
Old 2008-11-27, 03:02
radioman radioman is offline
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Default Re: I dont know how but my FM radio is picking up

Deldot? Where you at staples?
 
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