[BC] FM Modulators for Satellite Radio

[Paul Smith W4KNX]

I've been watching this thread for quite awhile now.  I believe there are
two distinct items being talked about here.  In my mind, a modulator is a
hard wired device that when on, shorts to ground the antenna input and
directs the rf output via coax direct to the input of the car radio.  These
normally do not cause any problems with excessive radiation.  I have one of
these in my truck.  I cant here the modulator on an FM radio right next to
the truck.  Now, on the other hand, my son in law has an IPOD that has an
accessory item that is really a little part 15 transmitter with a short wire
attached to it.  It has about a 100 foot radius.  Some of these portable
satellite rx's and IPODS are used in cars laying on the seat and tuned to
the freq by the car radio.  This is what is being heard in most cases in my
opinion.
Two different devices, both being called modulators.

Paul Smith
Sarasota, FL


----- Original Message ----- 
From: "Richard Fry" <rfry at adams.net>
To: "Broadcast List" <broadcast at radiolists.net>
Sent: Sunday, June 25, 2006 11:50 AM
Subject: [BC] FM Modulators for Satellite Radio


> Rich Wood:
> >I no longer subscribe to satellite radio but I have a modulator
> >that's inserted in the car radio's antenna line. It doesn't radiate
> >and overwhelms any other signal.
> ________________
>
> Just curious, does the receiving antenna get disconnected when you're
using
> the modulator?  If not, then the r-f output of the modulator could radiate
> plenty from the car's antenna, unless it is injected through some kind of
> directional coupler -- which seems a bit exotic for this kind of a device.
>
> RF
>