Re: Active Antennas
开云体育Another extensive active antenna link!? Thanks! More reading ? Time allowing, I will build something. ???Right now, I got to take care of business as a priority so getting something that reasonably works is way to quickly fire up the SDR. For $12 arriving in two days looks like a good choice.? Being open, it allows me to see the design.? I obviously need to add a simple enclosure. I have lightning rods on my home, so I plan to attach the antenna to one of them.? I will ground the bottom end of the coax to the buried ground system. That reminds me:? When I built the house, I used 1” regular copper plumbing to run a low impedance ground connection from buried lightning ground system to my workbench. The plumbing inspector had a fit since the pipes were not on the plumbing drawings. Bertho ? From: [email protected] <[email protected]> On Behalf Of wn4isx via groups.io
Sent: 9 March, 2025 12:56 To: [email protected] Subject: Re: [electronics101] Active Antennas ? While I learned the required subject mator for my two degrees in university, the main thing I learned in university was how to research. It was a bit of a challenge to transition to the web but well worth it it. At my last two jobs I was the unofficial "researcher." ? Glad to help. ? I'd seriously consider breadboarding a stock PA0RDT dead bug style, isolate the 'plate' with a dremal tool. The J310 is easy to locate, the 2N5109 might be a challenge. ? Avoid active antenna designs with MOSFETs as the gate capacitance will kill the incoming RF. This can be avoided but it gets way too complex for the performance of the antenna. ? This is another resource, I've built the antennas using 6CW4, I used 13CW4 because I had them. ? This design works extremely well...OK can't copy the link as it brings up the graphic. Look for the design that uses 3 6CW4s. ? ? |
Bertho