I.C.E. & ElectricalPost all your I.C.E. (In Car Entertainment) and wiring questions here. (Audio, video etc.)
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Only time i have personally used the AM stations was to try and find sports stations that are broadcasting nfl games, which will be coming very very soon. God i can't wait for something else to be broadcast on sportscenter besides boring old baseball. ok this is off-topic so i will stop now.
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Your problem is your power antenna!!! Some people dont even know that are cars have powered antenna's. If the power antenna is not powered on you only get FM and no AM trust me it's happened to me!!\
You need to power the Yellow/Green wire in the factory harness in order to get full Radio reception.
Originally posted by WhiteRabbit a class D amplifier kills your am reception? that seems kind of silly....
how does class D affect AM reception?
ok, i'm not a RF expert but I will try and explain this the best I can...
Class D amplfiers switch the output from -HV to +HV (as you prolly already know) The output is a PWM waveform at some carrier frequency. Those severe transients produced from the squarewaves creates harmonics of the carrier frequency. These high freqs are radiated out of the amp (now here is the part i'm not positive HOW/WHY) either its radiated thru the air, or maybe the wires connected to the amp which disturbs the AM reception. If the amplifier has a lot of Ferrite beads to reduce this noise, then it may not be an issue. But I do know that RF's BD's will essentially eliminate your AM. I don't know if this is tru for all cases but I know its a prevelant problem that isn't really addressed because like LudlamTheory says "AM still exists?"
As mentioned above, this is not my area of expertise so if you disagree with something written above, i will gladly listen but this is true to the extent of my knowledge. If this answer isn't suffecient for anybody, I can talk to my boss (The VP of Eng here at RFafter 5 hours of him lectureing to me, I can try and decode what he tells me to offer a better explanation.
hmm... now i'm gonna have to decide whether to ground or power the antennae. i'll try both i guess.
AM does exist. No, I particularly would never use it. But beng that my dad's Korean... 1480AM happens to be a Korean channel. Then there's your typical news channels that my generation of parents love. haha.
I'm not running any amps as of yet, so that's not the problem - but will keep in mind when I do drop them in.
You must hook up the power antenna wire! The wiring adapter won't have that wire so you have to make a jumper from the Honda wire to the Pioneer power antenna wire.
Originally posted by tbone323 ok, i'm not a RF expert but I will try and explain this the best I can...
Class D amplfiers switch the output from -HV to +HV (as you prolly already know) The output is a PWM waveform at some carrier frequency. Those severe transients produced from the squarewaves creates harmonics of the carrier frequency. These high freqs are radiated out of the amp (now here is the part i'm not positive HOW/WHY) either its radiated thru the air, or maybe the wires connected to the amp which disturbs the AM reception. If the amplifier has a lot of Ferrite beads to reduce this noise, then it may not be an issue. But I do know that RF's BD's will essentially eliminate your AM. I don't know if this is tru for all cases but I know its a prevelant problem that isn't really addressed because like LudlamTheory says "AM still exists?"
As mentioned above, this is not my area of expertise so if you disagree with something written above, i will gladly listen but this is true to the extent of my knowledge. If this answer isn't suffecient for anybody, I can talk to my boss (The VP of Eng here at RFafter 5 hours of him lectureing to me, I can try and decode what he tells me to offer a better explanation.
~Tbone
how do you know all this with that tiny little brain of yours. lol
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no, i dont disagree, i jus ttotally didnt know, sounded like an odd pair of things to be related
i just have one thing i was hoping you could clarify. and that is where does the ferrite bead go, and what is its structure? is it jsut that, a bead made out of ferrite? if so, where do they put them to control the carrier wave harmonics?
oo, oo! lemme guess first, i had a thought that i pulled out of my rear end.
do they go around the ouside of the output wires that transmit the carrier frequency and act essentially as a faradyay cage for the harmonics, not allowing any to leave the amplifier?
Originally posted by WhiteRabbit oo, oo! lemme guess first, i had a thought that i pulled out of my rear end.
do they go around the ouside of the output wires that transmit the carrier frequency and act essentially as a faradyay cage for the harmonics, not allowing any to leave the amplifier?
ferrite beads are used to supress EMI signals. They are found on the inputs and outputs of electrical equipment so as to not malfunction due to input EMI or transmit EMI down the line.
You prolly have seen them before...they can be used outside of the device on the cables or, more commenly, the ferrite beads are internal.
The prob is they are not cheap and as you ALL know, to companies, its all about the bottom line and if its not cheap, it prolly won;'t be included (unfortunately).
this topic is boring me (you prolly won't notice ANY diff) because it blocks RF and EMI signals so you may* get better radio reception, but your audio coming out of your amp wont sound ANY better.
damn it... it didn't work... I tapped into the Yellow/Green wire from the factory harness... and plugged it into the remote turn on wire from my radio... and i still get a shitty static am.... I used one of those crimp on wire thingies... (the one where you put the wire you are tapping from in the long hole, and the recieving wire right next to it and close the little metal thingy and click it shut.. )
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Sorry for digging this post up after 2.5 months, but i just had to solve this problem because i left work last night and was listening to the MNF game at work and i couldn't listen to it in my car because for am all i hear is crap, i get one AM station in my car but none of the ones that play sports. thanks for all that posted with good info, i just need to rip out my HU...again...got i hate doing this, it's such a pain in the arse to me since i got my civic, it was sooooo easy 2 yrs ago when i drove a......well i drove a dodge neon but atleast in the neon i could steal/remove a radio in under 15 seconds. i guess thinking about it now i'm glad our civics are harder to get at the HU.
this is just postive proof that the SEARCH FEATURE works, so get searching you noobs, i posted quite a bit on this site last spring but stopped because all the "new" posts just seemed to be about the same old questions that were talked about previously.
ok we can let this thread die now, please nobody reply unless it's good, unlike my post here.
__________________ My whole existance is for your amusement and that is why I'm here with you.
Problem with AM reception, along with FM reception in our cars? The antenna is in the back window. If you tinted over it, it's worse than it was before.
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I have the same problem with my Alpine 9807. I tried connecting the yellow/green and blue wires with no luck. Can someone explain exactly how to connect the power antenna lead? I called a couple of local places for some info and all I got was a "your car doesn't have a power antenna". I can post a picture of my setup if needed. Thanks.
but atleast in the neon i could steal/remove a radio in under 15 seconds. i guess thinking about it now i'm glad our civics are harder to get at the HU.
