With enuf time Casey, we can sked on 20M - cw ..... i.e. It sounds like you will be there sooner rather than later !!
- Bob w9ya P.S.... 20M hf antenna here is a window-line center-fed doublet with automatic L tuner of a good length and height for 1000 mile to DX use. (Stinks on 'close in' (< 500 mile) stations.) P.P.S..... Later today I am going to hook-up my 20M qrp rig ... homebrewed pic-controlled cw rig....small enuf for my pocket, big on the correct features (just worked out the rit/xit-scratchpad freq. memory switching stuff)...... and a wickedly mighty 4 watts rf output. On Fri, Feb 25, 2011 at 1:41 PM, Casey Barker <[email protected]> wrote: > 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 >> >> > > _______________________________________________ > altusmetrum mailing list > [email protected] > http://lists.gag.com/mailman/listinfo/altusmetrum > >
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