bruce Posted December 20, 2004 Share Posted December 20, 2004 ... its actually power coming through the coaxial feed, which is paired off at source, back from my new FreeView digibox. Dodgy or what?!<{POST_SNAPBACK}> This is not unusual. Several types of devices may apply a DC offset to a RF connection. Sky digiboxes will do it on the RF2 output, although it's switchable from the installer menu. I'm guessing that the FreeView box does the same. It's effectively "phantom power" to power a downstream device - typically a remote control extender for use in another room. A similar system can also be used to power masthead aerial amplifiers. But it's usually around 9v DC.... Bruce. Link to comment Share on other sites More sharing options...
Pete McCrea Posted December 20, 2004 Share Posted December 20, 2004 I've been bitten several times from the composite feeds on various video equipement. I questioned it too, but apparently it's not too unusual..... Still wasn't too sure though! Link to comment Share on other sites More sharing options...
nickb12345 Posted December 20, 2004 Share Posted December 20, 2004 Do you have a powered coax signal booster on the feed? I have noticed this a few times on boosted feeds but never seen it on a non-boosted feed so always assumed it was something to do with the booster. I could (and probably am) wrong tho! Nick Link to comment Share on other sites More sharing options...
PoppaDom Posted December 21, 2004 Share Posted December 21, 2004 Hi I was plugging in my tv coaxial feed tonight and recieved repeated small voltage electrical shocks when touching two bits of the connectors. My understanding was that TV Coaxial cable carried signal, rather than anything noticable voltage wise, so why was I getting a shock? Peter<{POST_SNAPBACK}> TV Ariel boosters work by amplifying the gain of the signal received from the ariel. TV boosters therefore can produce voltages at their output stages that are definately noticable when you touch them! Have experienced this many times before when distributing signals for conferences and throughout my home! As for no picture do you get a picture when if you plug a conventional television into the split signal? If so I suggest your pc card is faulty, if not I'd start looking at the split, particularly if the television plugged into the other side of the split works! Hope this makes some senseDom - Yes, the guy who was 2 years above you! ;) Link to comment Share on other sites More sharing options...
la grande homme Posted December 21, 2004 Share Posted December 21, 2004 freeview box at work does the same thing... wakes u up and teaches you to look at what you are doing rather than reach round behind and use touch 'n' guess... George Orwell was right... ;) Link to comment Share on other sites More sharing options...
Light Console Posted December 21, 2004 Share Posted December 21, 2004 Interesting, this happened to me a few years ago, setting up my Philips On digital box as it was then! I got many shocks from the darn thing, as I plugged anything into it while touching its caseing. I think I solved it when my DVD player was installed with a car Bass Bin for the bass, which hummed like heck till I wired a plug with only an earth pin to the common of the audio signal. Link to comment Share on other sites More sharing options...
peter Posted December 23, 2004 Author Share Posted December 23, 2004 Dom et al - I've not got a powered amplifier in the circuit. Doesnt matter now because I have a TV instead of the PC-TV card - the chances are it was a dodgy PC-TV card. Voltage was a bit strange though. Link to comment Share on other sites More sharing options...
P. Funk Posted December 23, 2004 Share Posted December 23, 2004 I've got shocks off coax before when plugged into a VCR... Was never quite sure why... Link to comment Share on other sites More sharing options...
AaronHorn Posted January 6, 2005 Share Posted January 6, 2005 I get shocks from my old cheap (Matsui?) VCR here, I canonly guess it is due to the ground (not earth) rail being thesame one used for the power supply and ground connections. You could maybe put a diode on the external connectors but this is just more money for the manufacturers, the manual does after all say not to plug anything in while the power is on! It may be the same with the PC, at best power supply levels running round an average PC are a bit dodgy (looks at a pile of destroyed motherboards). Having read some more of the replies and looking at my digibox (a Nokia 221T) I've just noticed it has a DC 10v connector on the back marked 'TV aerial connector', I guess it's power to run a head end aerial amp? Maybe your digibox is acting in reverse, that is electricity flowingup the wire to the aerial for use with an amp? -- Regards,Aaron. Link to comment Share on other sites More sharing options...
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