Hi guys, thanks for all the advice. I think I'll get the SMA option, then buy or craft an SMA antenna and just run it through the forward bulkhead with some tubing or tape. That way, if I do shred an antenna, I can just screw on another one.
Keith: This is actually going to be my first high-power rocket, so your LDDD construction notes have been a great help. Thanks! And not that I don't trust the Telemetrum, but my cert flight will probably use motor-ejection. :) Here's my construction blog, if you're interested: http://intrinsicallyunsafe.blogspot.com/ Bob: I'm a software guy, but I've worked around radio folks for years. When I read the Tech manual, it seemed easy enough that I figured, "what the heck" and read the General/Extra manuals, too. If it still required 20 wpm Morse, I'd never have gotten past Novice. I did re-read the ARRL Extra manual chapter on antennas. There's a fair bit of detail in there if you want to, say, rig up a big HF array and match it to your RG-8 feedline. But there's not much in there if you just want to hang a UHF 1/4-wave wire off the back of your transmitter. It's this "simple" stuff that I'm missing. That said, I do intend to pick up the ARRL Antenna Book and Handbook before I get into building an HF rig. Thanks again, folks. Casey Barker AG6CE On Fri, Feb 25, 2011 at 9:16 AM, w9ya <[email protected]> wrote: > Funny you should mention that, as a local ham told me he appreciated my > recommendation when he was looking for antenna theory and related info. I > told him that; > > I find the 1940-65 editions of the ARRL Antenna Book to be the most useful > in gaining a *quick* understanding of antennas and such. These can be > found/had for not so much money at the usual e-places. > > The newer ARRL publications generally leave out some important stuff to > find a place for other info OR they put in too much stuff with bad editing > for clarity and content. This is especially true with the much of the stuff > the ARRL has published in the last 20 years or so. > > Anyways, that be my two cents worth on ARRL publications. > > Vy 73 Om de; > > - Bob F. > w9ya > > On Fri, Feb 25, 2011 at 9:48 AM, George Shaiffer <[email protected]>wrote: > >> 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 >> >> _______________________________________________ >> >> altusmetrum mailing list >> [email protected] >> http://lists.gag.com/mailman/listinfo/altusmetrum >> >> > > _______________________________________________ > altusmetrum mailing list > [email protected] > http://lists.gag.com/mailman/listinfo/altusmetrum > >
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