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SDR radio, Software Defined Radio
Antenna thread
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<blockquote data-quote="Vipersan" data-source="post: 972636" data-attributes="member: 325666"><p>I've added the cable length to the original post ...about 20 mtrs</p><p></p><p>I get sod all with the bias tee ie no supply to the LNA ...</p><p>I'd have to remove it to get a comparison ..</p><p></p><p>Just out of curiosity ...SB</p><p>Could the soldered connection at the base of the helix where it joins the sma bulkhead be an issue ..</p><p>Impedance matching wise ..</p><p>Also ...what height above the ground plane is your first 1/4 turn of the helix where it runs parallel to the ground plane ? I too am using 2mm copper wire ...</p></blockquote><p></p>
[QUOTE="Vipersan, post: 972636, member: 325666"] I've added the cable length to the original post ...about 20 mtrs I get sod all with the bias tee ie no supply to the LNA ... I'd have to remove it to get a comparison .. Just out of curiosity ...SB Could the soldered connection at the base of the helix where it joins the sma bulkhead be an issue .. Impedance matching wise .. Also ...what height above the ground plane is your first 1/4 turn of the helix where it runs parallel to the ground plane ? I too am using 2mm copper wire ... [/QUOTE]
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