> >HELLO
> >ALL!!!!!
> >In regards
> >to the
> >following
> >>This type of thing is very common in other arenas of RC hobbies. Radios and
> recievers use pulse code modulation (PCM) to encode the signals so they aren't
> interfered with by other things on that freq. I've seen two airborne RC planes
> on the same freq., both with PCM.
> A little while ago I asked about the PCM systems at my local hobby shop and
> was told similar stories as well as stories about the remarkable air range of
> these systems. For a FM PCM 2 channel system complete I was quoted
> approximately $80. However I don't want or need the mechanical servos.
> Instead I wonder if someone makes an electric switch or relay for this system.
> Or maybe I could simply power up an electric match right off the receiver once
> I determined how the receiver powers the servos??????????
> If relyable this sounds like a great way to control the complex rockets like
> multiple stages.
while you're there -- look for the ads. You should see several ads for
servoless switching banks that operate off a servo channel, electronic
speed controls that use an SCR circuit to chop DC for control of an
electric motor, R/C operated sound and light systems, and so forth; many
of these don't even require modification of the transmitter, though
others either involve a customized transmitter or an add-in circuit board
that only works with certain brands.
There might be safety issues, even with PCM radios, in using a direct R/C
control to fire motors, but for other rocket functions, including
ejection (at least as a backup) and stage separation, these might be one
way to go, and won't cost a great deal more than a Pratt ECS or
comparable system -- plus you'll have extra channels you can use to steer
a glide parachute or maneuver a boost glider.
--
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| It's easier to create chaos than order -- 2nd law of thermodynamics |
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| TableTop Publications http://members.aol.com/silntobsvr/ttop_pub.htm |
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| All opinions expressed are my own, and should in no way be mistaken |
| for those of anyone but a rabid libertarian. |
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