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Tech Head - The Technology Section
SDR radio, Software Defined Radio
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<blockquote data-quote="Terryl" data-source="post: 987361" data-attributes="member: 369937"><p>For areas where they do not allow external radio antennas we use to use what was called a "Venttenna" it was a black piece of ABS 2 inch pipe with the antenna built inside it, you slipped it into the roof vent for your sink or toilet.</p><p></p><p>I don't think they make them anymore but you can build one up, if they ask why the vent is so high you just say that you were getting sewer gas back into the house and some plumber did the job.</p><p></p><p>What was inside was several 5/8 wave dipoles made out of wire and co-phased, all wrapped around a second sleeve that was slipped up into the 2 inch ABS pipe, I have one for 2 meters and 440 that was used at an apartment I stayed at for a bit, worked great.</p></blockquote><p></p>
[QUOTE="Terryl, post: 987361, member: 369937"] For areas where they do not allow external radio antennas we use to use what was called a "Venttenna" it was a black piece of ABS 2 inch pipe with the antenna built inside it, you slipped it into the roof vent for your sink or toilet. I don't think they make them anymore but you can build one up, if they ask why the vent is so high you just say that you were getting sewer gas back into the house and some plumber did the job. What was inside was several 5/8 wave dipoles made out of wire and co-phased, all wrapped around a second sleeve that was slipped up into the 2 inch ABS pipe, I have one for 2 meters and 440 that was used at an apartment I stayed at for a bit, worked great. [/QUOTE]
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