Create our own XM receiver since the XMPCR is done with?

judoGTI · 08-31-2004, 10:20 AM

I'm not an EE at all, would it be possible to create our own XM receiver to use with our carputers?

Since XM killed the XM PCR and are taking the USB port out of the new SkyFi2 because of the RIAA, we need something to give us one screen channel changing capability for XM in our cars.

Would this be possible? Im not talking about 'stealing' service. Everyone still needs to pay for their service, Im just talking about making a receiver to have the ability to get XM on our PC's?

darkhalo · 08-31-2004, 10:30 AM

i think we should steal it. jk. but a project like this is not posible

judoGTI · 08-31-2004, 10:41 AM

Bah, that is too bad. We'll hopefully XM will come up with something for us dopey PC users.

Zip-Lock · 08-31-2004, 11:18 AM

I think the new SkyFi 2 will have computer support in some way. Also the Sony PNP has a USB port but there isn't yet a way to control the unit via the USB port. I’ve heard Sony unit can also be cloned.

chut · 08-31-2004, 12:58 PM

Like this?

http://www.xm411.com/phpbb/viewtopic.php?t=4202

nirvanades · 08-31-2004, 02:02 PM

Nice Find Chut - we should contact the guy- or have you already?

chut · 08-31-2004, 02:06 PM

er...nope, If you read into it a little you'll see that it is huge (rackmounted) and cost a little over 300.00 or 500.00. I forget which. Just an interesting read I thought. Besides, he uses the decoder from an XM PCR....I think.

kingtut · 08-31-2004, 02:23 PM

yes, it is built around the XM PCR - dead end

The Durango Kid · 08-31-2004, 03:16 PM

The only way to build a XM reciever is to steal the signal or take a XM code out of another XM reciever.. Each unit has it's only key code hardwired into the unit.. Once you sign up for XM they add your keycode to the downstream of accepted key codes.. you CAN steal it.. But I'm not about to get into that..

brage · 09-01-2004, 04:43 PM

From what I understand, the actual receiver potion in XM radios is all the same and is provided by XM to the OEMs (sony, etc). This receiver unit exposes an RS232 (serial) interface which the OEMs connect to to control the receiver. From what I understand, the XMPCR basically just provides a USB->serial connection to this serial interface.... Perhaps someone with more knowledge in this area could expand on this.

This is all hear-say on my part, I have just read this from other sources!!

-jeff

KMorphosis · 09-01-2004, 04:50 PM

it is possible to do it using a regular delphi skyfi receiver. Im a regular over there on xm411 and it has been shown to be possible. I was lucky ennough that i bought a xm pcr 2 weeks ago for 39.99 and one without an antenna for 14.95. I was quite lucky..

But research over there for using a delphi skyfi . the only thing that you need to fix is the audio out problem, I have an idea how to fix it but need to look at some other things first..

KMorphosis · 09-01-2004, 04:56 PM

check this post out too..

http://www.xmfan.com/viewtopic.php?t=13207

ACHIEVER · 09-01-2004, 05:38 PM

Quote:

check this post out too..

Must say this looks interesting. Good link

Nufis · 09-01-2004, 05:51 PM

I guess anyone looking at the pcb (printed cirquit board) of the projesc can figure out - there is only one REALLY needed component on it - the tuner (for those who don't care - the big metallic box in the middle), like the ones in your tv-sets, sat-boxes and pc-tv-tuner-cards. The tuner here is everything - it tunes on the right frequency channel (could be hardcoded in there, since the entire service seems to be provided through only one transponder as digitally muxed stream of all the 40 channels), it down-converts and detects the signal converting into simple unmodulated digitally readable data stream, it possibly even demultiplexes the package down to a single channel and even decrypts it, thus all you have to do is to feed it into SPDIF or wherever you want (lets say convert to analog-audio using D/A convertor). All the other components on the pcb is more or less a bull**** added by author to satisfy his passion. All it (tuner) takes in is THE CODE (also could be hardcoded like a serial number) to decrypt the stream, and a "channel" selection sequence (also very simple digital signal). Thus all the math and aftermath is done IN THERE, let's say in some custom programmed pga (programmable gate array - cirquity level programmable, proccessor like digital ic). And those are next to impossible to replicate, if you cannot directly read out their code, or if you're not purely genuine.
...it all makes me tink it's one way or another a sad story on it's end...