satellite radio amp / coax power

Cabling-Design.com FREE cabling and networking Helpdesk
icon
 Question by Eric Huang posted 28 Jun 2007
 satellite radio amp / coax power
I installed a Sirius satellite radio antenna on my roof and connected it through my structured wiring enclosure with RG6 coax. Initially, my signal was poor, but I installed a Pixel Technologies XM/Sirius Radio SBA In-line Amplifier (SBA-1) and my reception was much better. Since the amp doesn't have any power injection, is it really just a noise filter?

Second, I was told that a coax power inserter is only necessary if my run is over 250 ft long. My run is only 40 ft long, but I am still having occasional signal loss. Would my set-up benefit from adding a DC coax power inserter? I'm afraid that I may be adding additional noise to the line without any benefits to reception.

Thanks!
icon
 Answer by Dmitri Abaimov posted 06 Jul 2007
Dear Eric,

Without power the amplifier is actually an attenuator so you might as well just remove it and see what happens to the signal. Also Sirius transmitter works in 2.32GH band whereby RG6U cable is usually only rated until 1.5GHz beyond which bandwidth (almost) no manufacturer even measures the performance. So, you are bound to have extra losses in the cable no matter what length. In addition, each connector/splitter has its own bandwidth limitations and most (high end) are rated 1GHz or slightly above that.

So, if removing a powered off amplifier does not help, I would go for the power injector. I am assuming the model you have do actually receive the power via an injector. You will undoubtedly aplify noise as well as useful signal but the digital transmission may do wonders sorting this out, as long as there is a signal to sort through in the first place.

Sincerely,
Dmitri Abaimov, RCDD

Click here to see the expert's profile
Back to the current page of questions | Back to all the questions
Back to Cabling-Design.com HELPDESK | Ask your question
Residential Cabling Guide

Home Cabling Guide

Finally, an instantly downloadable book that saves you thousands in home improvement dollars! Enjoy living in 21st century technology-advanced home while increasing its selling value and competitive advantage on the real estate market. Whether your cabling is for home office or high-tech leisure, you can wire your home yourself or learn "wirish" to speak with your cabling contractors in their language!

Learn more ...

Please rate this page

Rating: Average rating: Ratings
BadFineGoodVery GoodExcellent