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Discussion Starter #1
I have some detail questions about using an FM Modulator. I have never used one and a few things are not clear to me.

- Do I need a special antenna adapter, or does the PCM use a standard antenna hookup? i.e. would the Scosche kit be enough?
Amazon.com: Scosche FM-MOD02 FM Modulator for iPod, Satellite Radio or Portable Music Player: Electronics

- How is power hooked to these units? Basically, is there a connector back there to hook up to? (PCM)

- The Scosche unit above has a switch. What is this switch for? Does it basically turn off your existing antenna when needed? This would make sense, but make it one more thing to mess with/install. For the following unit, one of the reviewers said it "turns off the original antenna".
Amazon.com: Movies 2 Go FM100A FM Modulator with IST2 Isolation Transformer (Grey): Electronics

- Whats is the isolation transformer in the unit above? Would this make it a better option?

- Anything else I need to know? From the comments here, it appears to be very important to ground it well to avoid engine/alternator noise, etc.
 

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You would need this antenna adapter:
Metra 40-EU30 ** Enfig Car Stereo ** iPod XM and Sirius Satellite Radio & Auxiliary AUX Audio input specialists
(btw, 40-EU30 is just the combination of 40-EU10 and 40-EU20)

For hooking up power I would just follow one of the radar detector install articles. Pretty much the same thing.

Yes, that switch is because it cuts off the factory antenna.

I don't know the details of all the different devices. I would expect one to work automatically without the switch, just by sensing something on the input. That's what my XM unit does but it is specific for that purpose.
 

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Discussion Starter #3
Thanks, that was real helpful.

I currently have the T505 fm transmitter and it seems to be doing a good job. I don't seem get much static and when I pause the music it is pretty quiet (which I think indicates little static).

However, I notice it has a hard time reproducing some music, but not sure if that is static or because of frequency cutoffs inherent to fm transmission. If that is the case, then I suppose a fm modulator won't be much good either?
 

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Yeah, I'm not sure how much difference you would see with the direct connection. I'm sure it is a little clearer but you're right, the frequency limitations are because of FM and won't go away. The main reason I had to switch to the inline is because I could not find a clear FM station so I always for interference over the air. If you don't have interference from radio stations then it probably isn't a big deal.
 

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Yeah, I'm not sure how much difference you would see with the direct connection. I'm sure it is a little clearer but you're right, the frequency limitations are because of FM and won't go away. The main reason I had to switch to the inline is because I could not find a clear FM station so I always for interference over the air. If you don't have interference from radio stations then it probably isn't a big deal.
I live in Norcal where there is a station in every refrequency. Hardwiring however does not seem to help. I want to give the Scosche unit a try, but hesitate throwing more money at a modulator. If I am willing to give up FM all together can I just not plug in the external antenna and get the same effect?
 
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