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Old 12-26-2006, 12:44 AM   #1
h3x
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Post Wired FM Mod???

I keep seeing Wired FM Mod tossed around and everyone saying that it is a must for use with the ST4 (apparently the FM transmitter included in the radio is really poor with reception)... and I imagine it would be much worst since I live in Alaska.

Where can I buy a really good wired FM mod and instructions on installation?

Any help is greatly appreciated.
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Old 12-26-2006, 12:58 AM   #2
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This is what you want:

http://www.crutchfield.com/S-kSslWNm...=607FMDA25#Tab

That page has a link to the instruction manual as well. Crutchfield is a good place to order from, as is TSS-Radio:

http://www.tss-radio.com/direct-adap...ay-p-4082.html

People call it a "wired FM Modulator" but it's really just a relay switch between the FM modulator/transmitter in your Sportster 4 and your car antenna. It will disconnect your car antenna while your sirius tuner is on (thus eliminating any FM interference from terrestrial FM radio stations) and re-connect it when you turn off your Sirius tuner. Best $20 you can spend on your Sirius installation if you are using the FM transmitter. Also do a search here for "fm relay" and you'll find lots of info.
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Old 12-26-2006, 01:22 AM   #3
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Thanks, I'll read up on that as well

But, will either of these dealers ship to Alaska? Because I can't get the radios or service sign-up here.
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Old 12-26-2006, 03:04 AM   #4
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Quote:
Originally Posted by h3x
Thanks, I'll read up on that as well

But, will either of these dealers ship to Alaska? Because I can't get the radios or service sign-up here.
Yes both I believe.
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Old 12-26-2006, 04:13 AM   #5
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Right on, I just bought one off your website

Thanks again
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Old 12-28-2006, 11:44 AM   #6
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Quote:
Originally Posted by ProperModulation
People call it a "wired FM Modulator" but it's really just a relay switch between the FM modulator/transmitter in your Sportster 4 and your car antenna. It will disconnect your car antenna while your sirius tuner is on (thus eliminating any FM interference from terrestrial FM radio stations) and re-connect it when you turn off your Sirius tuner. Best $20 you can spend on your Sirius installation if you are using the FM transmitter. Also do a search here for "fm relay" and you'll find lots of info.
Am I crazy? I'm a reasonably intelligent guy, but I've always understood it to mean that it sent your Sirius signal to the antenna input of your car radio, eliminating the need for the built-in FM Modulator. Apparently that's not the case, seeing as how I just installed one, but still need the FM Mod. Is that really the case, or did I do something wrong? I removed the external (fender-mounted) antenna two years ago, and wasn't having any problems with interference. Just upgraded to a Starmate 4 this week, and hadn't noticed any additional interference, but thought I would get the FM Direct anyway. Looks like I may have wasted my time & money!
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Old 12-28-2006, 11:52 AM   #7
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Quote:
Originally Posted by moose135
Am I crazy? I'm a reasonably intelligent guy, but I've always understood it to mean that it sent your Sirius signal to the antenna input of your car radio, eliminating the need for the built-in FM Modulator. Apparently that's not the case, seeing as how I just installed one, but still need the FM Mod. Is that really the case, or did I do something wrong? I removed the external (fender-mounted) antenna two years ago, and wasn't having any problems with interference. Just upgraded to a Starmate 4 this week, and hadn't noticed any additional interference, but thought I would get the FM Direct anyway. Looks like I may have wasted my time & money!
The FM Relay (FM Direct) is not a modulator, it is a switch. What it does is provide a wire between the modulator in your sirius tuner and the fm antenna going into your car stereo. It switches your regular FM antenna off while your sirius tuner is on and switched the FM antenna on when your sirius tuner is off. This prevents the interference from FM radio stations that you get while using the wireless FM transmitter. So even though you ar using a wire insted of wireless, the sirius audio is still modulated onto an FM frequency so that the FM tuner in your car stereo can tune into it.

The only way to avoid using the modulator with a PnP tuner like the sportster or starmate is to use the audio-out port and connect it to an aux-in port on your car stereo. this signal is direct from the sirius tuner and not modulated onto an FM frequency.

I wouldn't say you wasted your time and money on the relay - it is always a good thing to have if you aren't using the audio-out direct connection.

hope this clears things up.
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Old 12-28-2006, 12:23 PM   #8
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The problem is with the description of the switching unit.

It has been commonly called an "FM modulator relay" (relay being the operative word)... Many shorten this to 'Modulator'. As ProperModulation points out... The device is NOT a modulator. The modulator is the FM transmitter built into your Sirius unit.

Calling it an 'FM Modulator' or a 'Modulator' is wrong and helps to spread confusion.

BTW, Sirius is now referring to the unit in all their literature as an FM direct adapter .
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Old 12-28-2006, 04:24 PM   #9
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Thanks for clearing that up, obviously I misunderstood how it worked. I'm not sure "direct adapter" is a much better name...
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Old 12-28-2006, 07:15 PM   #10
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Quote:
Originally Posted by moose135
I'm not sure "direct adapter" is a much better name...
It's FM direct adapter. Which is an adapter that allows you to connect the FM transmitter in your Sirius receiver directly to your car radio FM antenna input.

But you're right, unless you KNOW how the thing works, the words mean little
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Old 12-28-2006, 10:05 PM   #11
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Quote:
Originally Posted by paintedantenna
Yes both I believe.
Off Topic--Painted, your business rocks!! I ordered a few things so that I could properly install my new starmate 3 on xmas night. I have them in my hand only 3 days later and you paid for the shipping! I must mention, they were shipped nearly halfway across the US(I'm in NJ). I will definately be recommending you to all of my Sirius friends.
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Old 12-28-2006, 11:23 PM   #12
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Quote:
Originally Posted by jwt873
But you're right, unless you KNOW how the thing works, the words mean little
It doesn't help when Sirius can't explain it correctly - from the product descripton on shop.sirius.com:

The SIRIUS FM direct adapter lets you send the signal from your plug-and-play radio directly to your vehicle's stereo.

To me, that sounds like it sends the signal to the radio, not that it turns off your car antenna avoiding interference with the FM modulator. In any case, the sound is very good, and that's what matters in the end.
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Old 12-29-2006, 09:27 AM   #13
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When all else fails, you can always RTFM (Page 7)

The FM Direct Adapter directly connects the FM signal from your SIRIUS radio to your vehicle’s AM/FM radio, reducing any interference which might be present from FM radio station broadcasts. When the SIRIUS radio is turned off, the vehicle’s FM antenna is automatically connected back to the vehicle’s AM/FM radio. The adapter connects directly in-line with the vehicle’s existing AM/FM antenna input. The SIRIUS FM Direct Adapter is designed to work with SIRIUS Satellite plug and play radios
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