Casey I don't know if it is still true but in the past the ARRL Handbook was one of the best sources of all radio info including antenna design. Just a suggestion, hope it is helpful. George Shaiffer
Date: Thu, 24 Feb 2011 23:48:23 -0800 From: [email protected] To: [email protected] Subject: [altusmetrum] Telemetrum UHF Antenna Options Hi folks, I finally got my Ham license last weekend, mostly so I can fly a Telemetrum. Although I studied the licensing manuals, they didn't imbue me with much practical understanding of antennas. Indeed, they just made me realize how little I actually understand about RF, so I'd appreciate some advice. I'm planning to put a Telemetrum in the fiberglass avionics bay of a Performance Rocketry Little Dog Dual Deploy, but the bay is only 7" long, which poses a packing issue with regards to fully extending the Telemetrum's ~7" UHF wire antenna. My first thought was to just mount the Telemetrum on a plate towards the forward end of the bay, then bend the antenna back 180 degrees to the other side of the plate and run it back the length of the bay. However, I'd prefer to mount the telemetrum further back in the bay. My second thought was to mount the SMA version of the Telemetrum (which seems like it might be beneficial in other rockets anyhow) in the back of the bay, then run a short piece of coax to the front, bend the coax back, and connect an antenna there. In this case, I could buy a pre-built SMA wire antenna (BigRedBee, $6), but I'm also wondering if I could simply strip the last 7" of shielding off the piece of coax and let the center conductor radiate through the dielectric. Any thoughts? Thanks, Casey Barker AG6CE _______________________________________________ altusmetrum mailing list [email protected] http://lists.gag.com/mailman/listinfo/altusmetrum
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