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<blockquote data-quote="jeallen01" data-source="post: 999020" data-attributes="member: 176704">Depends on the amp you get, which depends on what frequency ranges you want to cover ?Some amps are intended for sat systems and cover 950-2150/2400MHz, whilst others, like I bought, cover down to much lower frequencies, and thus many of the bands below 1GHz.Sat line amps are 13/18V line powered, and so you need a DC injector, like I bought, and a suitable source of 12-15Vdc to connect to it - from what I found, virtually &quot;any old&quot; 12V -15V wallwart can be used for that, but I would advise putting some sort of filter in between that and the DC injector to reduce any RF crap getting to the injector input because the 1090MHz signals are pretty low level (tried to see them via the SSA module &amp; VMA's s/w but could not detect anything!) , and that's why I knocked one up, per the cct that I posted, and it does seem to work (or at least it does not appear to do any harm ;)).Listed the amp, DC injector&nbsp; and the filter components I used in the Trouble Shooting thread, and where you can get them from - though, on reflection, I should have used a larger die-cast box for the filter because it was a real problem to populate the small piece of stripboard that would fit into the box I bought.OTOH, there are some quite expensive head-end amps that are intended specifically for bands like 1090 MHz, etc. Don't know what they require in the way of Volts/mA, and I think that will differ - but it appears that you need&nbsp; to connect an external supply directly to them (which probably means you need a power socket reasonably close&nbsp; to the antenna - which is not an option for me, considering where the antenna is).</blockquote>

[QUOTE="jeallen01, post: 999020, member: 176704"] Depends on the amp you get, which depends on what frequency ranges you want to cover ? Some amps are intended for sat systems and cover 950-2150/2400MHz, whilst others, like I bought, cover down to much lower frequencies, and thus many of the bands below 1GHz. Sat line amps are 13/18V line powered, and so you need a DC injector, like I bought, and a suitable source of 12-15Vdc to connect to it - from what I found, virtually "any old" 12V -15V wallwart can be used for that, but I would advise putting some sort of filter in between that and the DC injector to reduce any RF crap getting to the injector input because the 1090MHz signals are pretty low level (tried to see them via the SSA module & VMA's s/w but could not detect anything!) , and that's why I knocked one up, per the cct that I posted, and it does seem to work (or at least it does not appear to do any harm ;)). Listed the amp, DC injector and the filter components I used in the Trouble Shooting thread, and where you can get them from - though, on reflection, I should have used a larger die-cast box for the filter because it was a real problem to populate the small piece of stripboard that would fit into the box I bought. OTOH, there are some quite expensive head-end amps that are intended specifically for bands like 1090 MHz, etc. Don't know what they require in the way of Volts/mA, and I think that will differ - but it appears that you need to connect an external supply directly to them (which probably means you need a power socket reasonably close to the antenna - which is not an option for me, considering where the antenna is). [/QUOTE]

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