Sirius Antenna - over coax or cat5? - AVS Forum
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post #1 of 5 Old 10-24-2005, 02:21 PM - Thread Starter
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Okay, I have a home theater rach area with plents of cat5 and coax runs that can be patched to the outside.

Is there any way to run a Sirius antenna over coax or cat5? That is, can I buy a home kit, cut the antenna cable, and splice it onto coax or cat5 somehow? Or is there an antenna kit that works over coax or cat5?

Thanks!
-Mark

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post #2 of 5 Old 10-25-2005, 09:36 PM
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Cat5 ->NO, COAX-> YES

http://www.sandsationalsound.com/adapter.php

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post #3 of 5 Old 10-26-2005, 06:24 AM
 
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the RG designation on coax cable means "Radio Grade"...it's for unbalanced RF signals. CatV is not.
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post #4 of 5 Old 11-15-2005, 11:07 AM
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Another source for SMA-Coax-SMB adapters is www.datacraft.tv. I just ordered one today.

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post #5 of 5 Old 11-18-2005, 06:34 PM
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Quote:
Originally Posted by TonyBDA
the RG designation on coax cable means "Radio Grade"...it's for unbalanced RF signals. CatV is not.
Huh?

Balanced or unbalanced refers to baseband audio. This is completely different from modulated carriers, which typically all RF is. Once modulated, there is no way to determine if the original baseband audio was ever balanced or unbalanced, or what the original polarity might have been.

Coax is a transmission line, and shielded to avoid direct ingress (which can cause antenna-like behavior) which Cat5e is not. There is no need for "balancing" a signal on shielded cable, as the shielding prevents ingress and therefore any need for phase cancellation. Coax appears as an infinite chain of series resistors and parallel capacitors, giving it a characteristic impedance that allows modulated RF at that same impedance (which is never characterized as "balanced" or "unbalanced") to present it to the load without reflecting back to the source, somewhat like a waveguide.

You would need to convert to a transmission protocol, like TCP/IP, not to mention some sort of modem or transmit and receive modules, to push sat radio over Cat5e sucessfully.

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