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<blockquote data-quote="Vipersan" data-source="post: 967469" data-attributes="member: 325666">[ATTACH=full]92180[/ATTACH] I wouldn't buddy ..(power from a sat card that is)the voltage might well be excessive ..Some Low noise amps draw their power down the coax ..some dont ...but usually about 3 to 5 volts ...not 13 to 19volts as with a sat card ....but then again ..I would not be using a sat card or lnb for the patch antenna&nbsp; ...so would be a seperate coax 50 ohm ...not sat connected at all..Bias Tees are basically just a method of in line power insertion to the coax without affecting the RF signal ...and using a low pass filter (ie cap and inductor in its simplest form ...to isolate the injected DC supply from the RF line without influencing the signal.They are usually frequency or band specific and imo ..grossly overpriced for the job they do..I have 2 LNAs ...one which has a choice of external power ...3 to 5v ...(similar to the one you linked to) ...and a more expensive WorldSpace one ...which has NO way of externally powering it ...and takes its supply down the coax at 2.3volts ..rgdsVS</blockquote>

[QUOTE="Vipersan, post: 967469, member: 325666"] [ATTACH=full]92180[/ATTACH] I wouldn't buddy ..(power from a sat card that is) the voltage might well be excessive .. Some Low noise amps draw their power down the coax ..some dont ... but usually about 3 to 5 volts ...not 13 to 19volts as with a sat card .. ..but then again ..I would not be using a sat card or lnb for the patch antenna ...so would be a seperate coax 50 ohm ...not sat connected at all.. Bias Tees are basically just a method of in line power insertion to the coax without affecting the RF signal ...and using a low pass filter (ie cap and inductor in its simplest form ...to isolate the injected DC supply from the RF line without influencing the signal. They are usually frequency or band specific and imo ..grossly overpriced for the job they do.. I have 2 LNAs ...one which has a choice of external power ...3 to 5v ...(similar to the one you linked to) ...and a more expensive WorldSpace one ...which has NO way of externally powering it ...and takes its supply down the coax at 2.3volts .. rgds VS [/QUOTE]

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