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SDR radio, Software Defined Radio
RTL1090 thread
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<blockquote data-quote="Vipersan" data-source="post: 976408" data-attributes="member: 325666"><p>Problem is Llew ...that there are already 2 LNAs inside the antenna back box ...so these 2 are as close to the actual aerial ...and as far frm the airspy as possible ...</p><p>So adding another at the full extent of the cable might well produce instability ....</p><p>You would then in effect have ..</p><p>Helix > LNA1 > Filter > LNA2 > LNA3 > Cable > RTL Dongle</p><p>I may try one fitted close to the Dongle as this would be more like Airspy...thus compensating for the known db drop of the cable..</p><p></p><p>Helix > LNA1 > Filter > LNA2 > Cable > Airspy LNA > Airspy proper</p><p></p><p>...</p></blockquote><p></p>
[QUOTE="Vipersan, post: 976408, member: 325666"] Problem is Llew ...that there are already 2 LNAs inside the antenna back box ...so these 2 are as close to the actual aerial ...and as far frm the airspy as possible ... So adding another at the full extent of the cable might well produce instability .... You would then in effect have .. Helix > LNA1 > Filter > LNA2 > LNA3 > Cable > RTL Dongle I may try one fitted close to the Dongle as this would be more like Airspy...thus compensating for the known db drop of the cable.. Helix > LNA1 > Filter > LNA2 > Cable > Airspy LNA > Airspy proper ... [/QUOTE]
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