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Old 01-02-2007, 05:50 AM   #1
undermind
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Default FM Out Trick to Avoid Using FM Wired Relay??

I read in another thread about using a wire connected connected to the FM out jack of a Sportster 4 for improving clarity of the FM transmitter. Using a length of 33.5" created a wavelength antenna. This is accomplished with a 2.5mm jack from Radio Shack..

There are supposed to be some threads discussing this, but I'm having a hard time finding much more than a mention. I'd like to hear HOW this works, and how many people are successful doing it..

Thanks
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Old 01-02-2007, 01:49 PM   #2
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I don't think that the precise length of the wire will effect it that much but you can do the wavelength math if you want to. I just grabbed an arms length of old cat-5 wiring, and $2.99 later was getting fantastic FM transmitter response on both my Sportster Replay and Stiletto 100. (Built two transmitter cables for the $2.99.)

See this thread:

http://www.siriusbackstage.com/forum...ad.php?t=92702

Good luck.
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Old 01-02-2007, 02:33 PM   #3
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That's funny. I saw your post in that other thread when I was looking around for info on this but I never clicked your first link. I misunderstood what you were saying, I thought the link was to a forum where you couldn't find the thread you were looking for.
Anyways, that's exactly the kind of info I was looking for.

by the way: One thing that occured to me when reading the instuctions in that link; why not just snip off the other post? There's two posts, a longer one and a shorter one. The author stresses several times to be careful not to short the two together. Why not eliminite the possibility by snipping the longer post off? Or at least shorter..
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Old 01-02-2007, 05:32 PM   #4
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Yes I was wondering the same thing. Although I did not clip off the second post in the end. I just used some electrical tape to make sure they did not touch.

The only other thing I did differently is that I un-twisted the twisted pair so I only used a single copper wire.

Let us know if this works out for you.
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Old 01-02-2007, 06:04 PM   #5
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If you do attach an antenna wire to the FM out, and if it's long enough, wrapping around a small portion of the car AM/FM antenna coax will help direct couple the signal to the car radio input. It's not a lot of coupling due to the shielding on that coax, but better than nothing. It helped a lot in the car we use the Visor FM modulator in. Prior to wrapping the FM out antenna wire like explained here, we got some interference. Now we get none. While the Visor has a very strong FM modulator output, I can't see where this wouldn't help some with the now weaker FM modulators.
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Old 01-02-2007, 06:19 PM   #6
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that plug and wire combo used to come with the S50's before they crippled the transmitters with the plug. The S50 I just got for my wife didn't come with the little FM antenna that i had and lost with my first S50. They used to have them at Tss-Radio.com but I don't see any now.
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