Bob, did you mount an SMA connector to your telemetrum? Using the core of a coax is genius. :) reason why I didnt think of it....
will definatly save that for the designers tool box. Clay On Tue, Jul 17, 2012 at 10:27 AM, w9ya <[email protected]> wrote: > Hey Clay and the gang; > > I made my antennas out of pieces of very small hardline (approximately > rg-174 size) that already had sma connectors attached at both ends. > > I converted this hard coax to an antenna by first cutting the line to > length (typically getting two antennas out of one piece of hardline) > and then cutting through the outer condcutor using a small tubing > cutter just above the connector. I also ran a dremel tool-cutter > lengthwise down the outer conductor so I could remove the outer > conductor being careful to not cut or otherwise damage the teflon > dielectric or center conductor of the coax. Finally I placed a small > dab of epoxy at the joint of the teflon and sma connector to keep > things assembled AND at the end of the other end of the antenna to > keep corrosion out. > > When dry these are very rugged and can easily stick up through a > grommeted hole in the top of your electronics bay. As others have > mentioned: a careful packing of the bay helps keep the antenna > straight although these hardline based antennas are VERY stiff to > begin with. > > Oh yeah did I mention they are rugged ? > > Anyways, I made up several of these and gave them away, lost some, > etc. If you can find a friend in the electronic test business,old > hardline hook-up assemblies can be had for very little money. I still > have three of these antennas and they are essentially in the same > condition as when I made them over two years ago. They all have been > airborne several times. > > Hope this helps you out some and VERY best regards; > > - Bob F. > > On Mon, Jul 16, 2012 at 7:38 PM, Clay & Carly Dunsworth > <[email protected]> wrote: > > > > > > Does any one use the Q2G2 ignitors for ejection charges? > > > > I am down to two ematches and ordered some Q2G2 in hopes of using them > for a > > few flights this Sunday. > > > > Hopefully I can get them by Saturday afternoon for a bench test. > > > > > > > > Second, is the antenna…? > > > > There are a few ways I can think of doing this. Some may be better than > > others, but all have problems as I would see it. > > > > > > > > My avionics bay is only 7in. > > > > > > > > is it best to mount the altimeter the furthest aft I can, and bend the > > antenna at the top. > > > > Would protruding the forward bulkhead and allowing the antenna the extra > 2” > > enhance the link.? > > > > > > > > My thoughts here, are that just bending the antenna, would be best, so > that > > it isn’t damaged. I usually pack dog barf, a quick link, and a hefty 2 > gram > > FFFFG charge. *54mm* > > > > I don’t think protruding into the payload bay would assist in any way as > the > > packing of the materials would bend the antenna. > > > > > > > > > > > > Mount the altimeter as far forward as possible. This would allow the full > > length of the antenna to be above the bulkhead. > > > > > > > > I think this would provide the best wiring setup, but again has the draw > > backs of having the antenna in an active area, not safely in the av bay. > > > > > > > > > > > > In the future, I can just make a longer e-bay. But this is a retrofit, to > > lighten up my sons rocket, and use the stock coupler tube. > > > > I welcome any comments… > > > > > > > > > > > > Writing this, I think one of those clear poly antenna tubes from the RC > toys > > may be the ticket… I can even put a dap of epoxy on the end to seal it > off. > > > > Do the farthest back thing, and a short protrusion with the antenna tube… > > > > > > > > > > > > Thanks, > > > > Clay > > > > > > > > > > > > > > > > > > _______________________________________________ > > 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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