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Guest Message by DevFuse

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Is there dangerous voltage off DirecTV swm ports


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11 replies to this topic

#1 ONLINE   cypherx

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Posted 20 June 2014 - 03:24 PM

Just curious if theres dangerous voltage (not to humans, but to elecronics) on a DirecTV swm port.

 

For example, say you have a green labeled 8 way feeding 8 rooms, and a cable splitter feeding a few rooms.  In a room with both feeds, if you accidently connect the coax jack from the DirecTV to a tuner, would it blow the tuner out?

 

Or is just the first, red port the only port able to pass voltage.  I know I could break out the multimeter and measure myself, but I don't have that out right now.


- > Link to my setup thread< -

My  DirecTV HD WISHLIST:  NickJR, Nicktoons, Revolt.TV, FXM, We, Oxygen, The Hub, Fuse, GSN, Sprout, GAC, Esquire, MTV2, BBC World News, Sundance, Up, Music Choice Play HD (formerly SWRV), Al Jazeera America, Military Channel, NASA

My DirecTV SD WISHLIST: MTV Hits, MTV Jams, Music Choice, Youtoo TV

 

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HR44-500
HR24-200

 


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#2 OFFLINE   litzdog911

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Posted 20 June 2014 - 04:17 PM

No, you won't damage anything do this. Only the "power passing" port passes the SWM power supply (typically 21-29V).  And even that voltage won't hurt anything. 


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#3 OFFLINE   veryoldschool

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Posted 20 June 2014 - 05:33 PM

No, you won't damage anything do this. Only the "power passing" port passes the SWM power supply (typically 21-29V).  And even that voltage won't hurt anything. 

Basically the only way you can screw up is to connect the PI BACKWARDS!!!!!!!!!!!!!!!!!!


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#4 ONLINE   armophob

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Posted 20 June 2014 - 06:38 PM

But do be careful when connecting the coax. I have tapped the center connector on the outer shield once and blew a PI.

No dangerous fire or anything. Just a quick spark and it was dead.



#5 OFFLINE   peds48

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Posted 20 June 2014 - 06:43 PM

If you connect a cable that is feeding power to the dish to a tuner you can damage the that tuner.


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#6 OFFLINE   P Smith

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Posted 20 June 2014 - 07:00 PM

BS, all receiver's inputs have Zener diodes to prevent OV



#7 OFFLINE   veryoldschool

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Posted 20 June 2014 - 08:06 PM

BS, all receiver's inputs have Zener diodes to prevent OV

No they don't!!!!!!

During testing a HR20 was literally "smoked" by a PI connected backwards.


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#8 OFFLINE   P Smith

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Posted 20 June 2014 - 09:03 PM

that's HR20 ... tell that its HW designers



#9 OFFLINE   gov

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Posted 20 June 2014 - 09:30 PM

I zapped a balun on a TV antenna by connecting the antenna lead to a PI.  (not that I make many mistakes)

 

I suspect a PI output connected to quite a few items might cause a problem, modulators, RF amps, UHF/VHF combiner/splitters.  I'm not going to finance research into this, the $1 balun was a severe enough hit for me.

 

:coffee



#10 ONLINE   cypherx

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Posted 21 June 2014 - 08:28 AM

Good information, thanks guys!


- > Link to my setup thread< -

My  DirecTV HD WISHLIST:  NickJR, Nicktoons, Revolt.TV, FXM, We, Oxygen, The Hub, Fuse, GSN, Sprout, GAC, Esquire, MTV2, BBC World News, Sundance, Up, Music Choice Play HD (formerly SWRV), Al Jazeera America, Military Channel, NASA

My DirecTV SD WISHLIST: MTV Hits, MTV Jams, Music Choice, Youtoo TV

 

---

HR44-500
HR24-200

 


#11 OFFLINE   litzdog911

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Posted 21 June 2014 - 11:03 AM

You're welcome!


HD DVRs: HR34-700; HR24-500; (2) HR20-700 + WD eSATA 1TB drive/Antec MX1 case; HR21-700; HR21-200 w/AM21
Receivers: H25-500 HD Receiver; H21-100 HD Receiver
Mobile Devices: Nomad

Additional equipment configuration details

Sun & moon help site your satellite dish


#12 OFFLINE   harsh

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Posted 21 June 2014 - 11:22 AM

that's HR20 ... tell that its HW designers

The HR20's designers are not the ones making false claims about their product.

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