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Old 08-12-2005, 12:53 AM   #31
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Quote:
Originally Posted by RoadClosed
This is all speculation of course but I doubt they "decode" anything Manco unless you have some inside info.. They may convert it to 900 megahertz and back but I don't see why they would mess with the signal at all.

To decode the signal it would take a key?
I didn't mean decode the content completely which would require a key, but demodulate the signal and then repeat it on a different frequency. The FCC requires the repeater to only repeat the intended signal, and no others, thus requiring a full receiver front end in the repeater.

The repeater that I and most would prefer to have is one that simply rebroadcasts the signal on the same frequencies so that you wouldn't have to attach a special module on the boombox and it could be made less expensive also.
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Old 08-12-2005, 01:34 PM   #32
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Well if it does demodulate the signal that blows my idea out the window. I was thinking that since the reciever doesn't know it is even there, in order to work properly, the entire band has to be passed through the repeater. Well the band allocated to XM. If this thing does demodulate the signal it would have to do all frequncies simultaneously? Which also makes me wonder how the heck Sirius and XM broadcast their channels. One would think there are multiple transponders and thus mutiple frequencys the receiver would have to tune and thus pass through the repeater. I am very interested in this. I know both were given equal bandwidth by the FCC they basically split the S band down the middle.

I am just curious from learning standpoint.
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Old 08-14-2005, 03:37 AM   #33
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Here's a possible answer...of course, it's a bit more expensive than $79, but...

http://www.spacialaudio.com/products/pcimaxultra/

It's a PC-based FM transmitter in the form of a PCI card...supposedly, without the power booster, it has a range of 1-2 miles.

That's a bit much, but it'd cover the whole house, and then some.

The price tag? Under $200. You can order it here:

http://www.pcs-electronics.com/en/pr...rans#Pci%20max

I stumbled across this while hunting supplies to start a local radio station, ironically. Keep in mind, it is ILLEGAL to transmit a signal more than 200 feet without a license from the FCC...that is, if the transmission is on the common FM Bands, 87 - 107, I think...

C.J.
(newbie)
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Old 08-14-2005, 09:44 AM   #34
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Quote:
Originally Posted by Manco
The repeater that I and most would prefer to have is one that simply rebroadcasts the signal on the same frequencies so that you wouldn't have to attach a special module on the boombox and it could be made less expensive also.
First, this would be technically difficult because it would be hard to isolate the tranmit antenna from the receive antenna. The tranmitter would tend to create "feedback" with the receiver, or at the very least, it would desensitize the receiver.

Second, it would not be legal. The FCC rules only allow consumer "license free" devices to transmit on certain bands. The SDARS bands are not among the "license free" bands for a good reason: The satellite signals are very weak and it would be very easy for a "rogue" consumer device to interfere with them. This is opposite the situation with say, the low power license-free FM modulator, where you have very strong signals from the broadcasters and comparitively weak signals from the FM modulators. It is mainly a function of the licensed field strength within the service area; satellite radio is MUCH lower than FM broadcast.

Some may point to cell phones and similar consumer devices that operate outside license free bands. These devices are covered by the system license of the cellular provider, but more important, frequency/power control of the cellular phone's transmitter is controlled by the cellular provider, so they can maintain their responsibilty for avioding interference issues. Many consumers do not have the technical knowledge to understand or resolve interference issues.
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Old 08-15-2005, 08:24 AM   #35
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Quote:
Originally Posted by Manco
These repeaters are intelligent in that they completely decode the signal on the front end, and then convert it to some other frequency to retransmit, then decode that signal and generate the original signal.
Quote:
Originally Posted by Manco also
I didn't mean decode the content completely
It kind of sounds like you DID mean that it COMPLETELY DECODES. Don't you read what you write?
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Old 08-15-2005, 10:04 AM   #36
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Thanks TPS. I did some digging in FCC and I doubt we'll ever see a repeater, that operates in the same band, fall into consumer hands. In fact Sirius has a tough time getting them sometimes.
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