802.11b is better, more range, besides you dont need the extra bandwidth.
There are Ethernet to binary adapters, plug and play as they were.
Or just get a LINX transceiver from Digikey.
I will get one for my Hybrid launch system.
Currently running RS-232, the tranceiver will be a drop in replacement for
I considered this. I used a Linx 433-Mhz transmitter for a
radio-tracking beacon I built. So I started looking at the specs for
their 900-Mhz models.
Their biggest drawback is lack of effective range. Their
'advertised' maximum range is 1000 feet - I'd expect that practical
issues would limit that to 750 or so. A broadband-RF amplifier could
boost that range by (possibly) a factor of 5, making the range
approximately 3800 feet. If I'm not mistaken, some of the larger
launches in the southwestern States place away pads over a mile from
the RSO/LCO setup. In order to accomodate that, the range has to be
I want to stay away from directional antennas, since they would
limit placement of the distribution boxes.
OTOH - if I design the system with a modular, plug-in
communications card, I can set it up to work as a wired, short-range
wireless, or long-range wireless system. The only difference would be
the way continuity-signal quality is reported... and that might be
changed anyway. :-)
G Harry Stine, founder of NAR and author of the bible of model rocketry
(hereafter referred to as "GOD"), "The Handbook of Model Rocketry"
recommended this format:
Tripoli and NAR typically use a centrally controlled range set-up in
principal like this at group launches. A "Torture Rack" refers to the
fact you have to wait till every rocket is ready to launch the first one
and you have to wait till the last rocket is launched or misfired to
recycle the pads. The bigger the launch the longer the wait. At LDRS
launches I have attended, average wait time is 2 hours, and 4 hours is
It is interesting to see the total void of logic and reason applied to
TRA offset distances as well. Real brain surgeons and rocket scientists,
these ones are :)
Rack is great for a football halftime show or retail store flight demo
where the whole purpose is to sequence the rockets with the narration or
the music, but for a group launch with hundreds of heterogenous rockets,
misfire alley is the ONLY way to go and allows use of your own pad. In
fact encourages it.
It is important to note that TRA and NAR have refused to release torture
racks from their cold dead fingers for the past 10 years. Learning
Just TECH Jerry
Valuable content generator.
Jerry Irvine, Box 1242, Claremont, California 91711 USA
Opinion, the whole thing. <mail to: firstname.lastname@example.org>
So in all but one or two sites it would be perfect then.
And so the exception can be either a directional antenna or someone with a
Seems reasonable to me, especially if you are just making one for yourself
and not making them commercially.
And if you are making them commercially then the antenna would be an added
income for you.
Make the controll end and leave the wireless transmission to their
Give ideas like short range linx gear or more pricy stuff.
TX/RX is easy if you have the gear to feed it the signals.
email@example.com (Tater Schuld) wrote in message
Howabout various sensor projects?
UV and IR backskatter detectors
Particle, gamma, and x-ray counters/detectors
atmospheric molecular species sensors (CO2, CO, Methane, etc, etc)
here's some ideas
- LEDs and flashing circuits for night launch rockets. simple, fun,
crowd pleasing. there's plenty of LED flasher kits available but
nothing special for rockets.
how about one of those magic wands that spells out a message when you
wave it? put one on the side of the rocket and "HI MOM!" or "FUBATF"
- and, how about a battery that can power LEDs for a short while but
weighs a lot less than a 50 gram 9V? maybe rechargeable too?
9V are typically rated for about an amp-hour. the LEDs don't need to
flash for hours, they need to flash for 15 minutes on the pad and < 2
minutes of launch and recovery.
- model/MPR/HPR flight capable fuel cells?
- general purpose telemetry unit that does not require a ham license to use?
- general purpose video & sound memory recorder... say, NTSC composite
in, stores it in some kind of very robust semiconductor memory.
for that matter, make a general purpose data recorder! maybe 10Mb
bandwidth, allocated in up to 10? channels? records for a minute. unit
survives and data is retrievable even after power failure, hard
- yesterday the JDR catalog arrived and it has a $50 micro-radar kit.
that got me thinking, hmmm, how about a landing deployment system that
works at configurable AGL. that would be great for popping out the legs
of a mars lander ... or deploying an airbag with a rover in it ... or
or or !
- does anyone have a clip system that will detach at launch? what I was
thinking for my "Jupiter Icy Moon Orbiter" was, put an SCR on the 12v
ignitor power from the LCO. then the "ion thruster" blue LEDs would
light up when you push the button. put a short delay timer on the real
ignitor wires and then you could "power up" the rocket in stages.
so, is there a reliable, serviceable, lightweight quick disconnect
connector system that might be appropriate for model/MPR/HPR rockets?
... I think I have seen pictures of a hybrid NOX connector that blows
off at launch...
- I like your ion drive project!!!
Tater Schuld wrote:
Sounds like the solar project I was working on, but if your powering LED's I
assume its a night launch.
I have 3, flown the low power model, have yet to fly the others.
I have one of these in the works too. If I can just nail the issues I have
with downloading EEPROM data through a 1-wire network to Windows 98 then I
would get some time to work on this.
Its 32Meg, samples at 1kHz and non-volitile. Currently only 4channels,
pressure and 3axis acceleration but its expandable.
Just use some thermalite, have the igniter light that , gives you your delay
IR datalink? Maybe for remote recovery system arming/safing?
I've also seen IR security detection systems trigger at pretty long
distances. (Or a small laser rangefinder?) For a last ditch deployment
back-up. (IF [(NC still on) AND (ground detect)] THEN (panic))
High voltage igniters versus high current ones, ie, spark based?
Thinking of a piezoelectric butane lighter fired spud gun, er, laundry
cannon, I saw once at Lake Powell. No batteries required. Anyone tried
to light pyrogen with a spark? On purpose, that is. ;)
Remote rod launch angle slewing for that last second spot landing or
Launch rod/rail/tower velocity measurements, maybe LED timing circuits?
A loud tone (locator beacon) might also be used for doppler velocity
measurements coming off, or near, the rod/rail. Anyone know the audible
frequency spectrum of AP or BP motors?
Modular data recorder: pressure altitude, acceleration, temperature (small NTC
thermistor which can be mounted outboard), rate gyro(s), all sending units can
be added independently as budget allows, data is recorded to an eeprom at
10 Hz? (20 Hz? Hz donut?)
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