Class D AMPS and FM reception issues
Thread Starter
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Extreme HDF Member
Joined: Nov 2007
Posts: 14,670
Likes: 139
From: East of the Sun, West of the Moon
anyone with this issue care to try something for us all?
good ole metal screen material from home depot? Has to be metal though and has to be magnetic. Get a piece large enough to wrap completely around the amp or head unit
good ole metal screen material from home depot? Has to be metal though and has to be magnetic. Get a piece large enough to wrap completely around the amp or head unit
Seems like I'm making small progress, I run a new power wire straight to the battery, folded a large piece of alm. foil, made around 6 layers and put between radio and amp. now on damp foggy mornings i can pick up my fav. station, on clear and warm afternoons I now get static but b4 I got nothing. Im still getting pretty good reception for the sorry azz local stations that I dont listen to, lol, My cd collection is really growing latly. Love the way it sounds, damn near drowns out my rinehearts. Starting to get a rattle out of one of the rears, when the $ is better will swap out the db's for mm's, and by the way thanks for the help and advice Ive recieved along the way, I would really have a sucky system if not for this forum.
Randy
Randy
Cruiser
Joined: Sep 2012
Posts: 203
Likes: 0
From: Mississippi
Well over a week and no response from soundstream about my email so I guess we are SOL. Bet they are not extremely worried about a few bikers having issues with there equipment.
Nutz you heard anything else on your end?
Nutz you heard anything else on your end?
Just got SS 4.520 installed yesterday. 2012 Street Glide. I do not use the FM, but wanted to give it a try. I am having zero problems with receiving stations? Not sure what going on? My antenna is also unhooked.
Thread Starter
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Extreme HDF Member
Joined: Nov 2007
Posts: 14,670
Likes: 139
From: East of the Sun, West of the Moon
must be something with us TX boys.. LOL
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Thread Starter
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Extreme HDF Member
Joined: Nov 2007
Posts: 14,670
Likes: 139
From: East of the Sun, West of the Moon
No sir not a word. On a side note I received a PM last night from Gone Riding who if you recall I sent a SS amp to. He's stated that he's had some success in reducing (not eliminating) the interference with ferrite coils and is looking for someone with the issue to test with him. I don't have the issue so I can't help. Send Gone Riding a PM if you're willing to test with him.
Intermediate
Joined: Aug 2012
Posts: 36
Likes: 0
From: Austin, Texas
Reducing FM interference
I've been testing that noisy SS PN4.540D amp on my bench. I can duplicate the problem using a portable radio sitting on the amp. With no audio inputs or speakers attached the amp causes strong interference on portions of the FM band any time it is on. Even strong stations are obliterated by the amp.
Running the amp power and ground wires 3 times through a ferrite core of a particular type greatly reduces the interference. Weak stations still are degraded when the amp is on, but medium and strong stations are fine. Again, this is all on the bench -- which doesn't often translate perfectly to the real world.
How this will work on a bike with the amp installed and under a load is the next test. I expect to have a head unit, speaker rings, BikeTronics module and such to install the amp on my Limited in a week or two and will let you know how that goes.
If someone wants to try this sooner, you'll need a Fair-Rite #31 ferrite core or 2. The ones I have been experimenting with are probably too small for most real installations. Here's what I plan to order from Mouser Electronics for my install: Fair-Rite part number 2631101902. They are about $4.00. Mouser had the first ones to me in 2 days using their cheapest shipping option.
Loop your power and ground together through this core 3 times as close to the amp as possible. Also, keep the ground wire as short as possible, and try to ensure a good chassis ground between the head unit and the amp. It's not yet clear from my testing if a ferrite core is also needed on the audio input lines or speaker wires. I'm hoping it isn't necessary, but it might pay order an extra core or 2 just in case.
Running the amp power and ground wires 3 times through a ferrite core of a particular type greatly reduces the interference. Weak stations still are degraded when the amp is on, but medium and strong stations are fine. Again, this is all on the bench -- which doesn't often translate perfectly to the real world.
How this will work on a bike with the amp installed and under a load is the next test. I expect to have a head unit, speaker rings, BikeTronics module and such to install the amp on my Limited in a week or two and will let you know how that goes.
If someone wants to try this sooner, you'll need a Fair-Rite #31 ferrite core or 2. The ones I have been experimenting with are probably too small for most real installations. Here's what I plan to order from Mouser Electronics for my install: Fair-Rite part number 2631101902. They are about $4.00. Mouser had the first ones to me in 2 days using their cheapest shipping option.
Loop your power and ground together through this core 3 times as close to the amp as possible. Also, keep the ground wire as short as possible, and try to ensure a good chassis ground between the head unit and the amp. It's not yet clear from my testing if a ferrite core is also needed on the audio input lines or speaker wires. I'm hoping it isn't necessary, but it might pay order an extra core or 2 just in case.
