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JR / Spektrum put on a few discussions with one of
the Spektrum's designers at the recent AMA show in Ontario, CA. I attended
one, interesting stuff.
Range and power are NOT the primary concerns that
the Spektrum people have with using their system on larger or non-foamy
ships. The issue is that the combination of frequency and antenna size
make it possible for larger planes with more solid structures or components to
potentially encounter an attitude where the little antennas are masked from the
TX, thereby losing signal, and perhaps, the plane. This would not be an
issue on park flyers, unless one were to mount a DA100 on one.
Other factors that may reduce range are
atmospheric, most notably humidity.
Carbon fiber construction will definitely maybe
possibly also have an affect on this issue of reception. So, if you
fly DLGs in the rain and feel that the risk of being shot down by your good
buddies at the field is larger than the risk of the carbon in your plane masking
the signal, you may find the range of the Spektrum to be a problem.
Otherwise, it should work fine on the manufacturer's suggested
applications.
He did indicate that Spektrum is working hard to
roll out a version that will be suitable for larger aircraft.
Lee Estingoy
Overland Park, KS
----- Original Message -----
Sent: Thursday, January 26, 2006 7:24
AM
Subject: Re: [RCSE] New Spread Spectrum
Radios
Thanks guys. Good link.
So, is 2.4G SS approved by
AMA? What happens if somebody wants to use a 2.4G SS radio at an AMA
Club field or even an AMA sanctioned contest? What frequency pin do you
use?
Some fool is bound to try it, even though the range is less than
72 MHz. However the range seems to be sufficient for DLG, (errr...
at least most of the time :-) ).
Would be a comfy feeling
knowing I can fly my DLG at any local park or small field and not be worried
about being shot down or doing worse to someone else.
Steve
Meyer
SOAR, LSF IV
At 10:01 PM 1/25/2006, Dan Ahearn wrote:
Should be fine on the slope. I
flew my buddy's in a easystar to 1500' AGL (RAM2 varified) and about 1800'
down range, no glitches no worries, solid as a rock. There is a great thread
worth looking at on RC groups.... http://www.rcgroups.com/forums/showthread.php?t=452817
In
fact, I've had a chance to wiggle the sticks on a 6102 converted to the
Spectrum, folks are running with it.
On 1/25/06, Doug McLaren
<[EMAIL PROTECTED]> wrote:
- On Wed, Jan 25, 2006 at 09:08:45AM -0600, Bob Johnson wrote:
- | As I see it, the biggest 'problem' with using one in a glider is
that the
- | receiver has two antennae, each 3.75 inches in length that should be
kept at
- | right angles to one-another.
- Apparantly each antenna is for a completely seperate RX on a
different
- 1 MHz channel (but being spread spectrum, these channels can be
shared
- with others), so if one gets a good signal and one doesn't, you're
- still good. So having them at right angles will give you a
better
- chance of picking up at least one signal for any given
orientation,
- but even having them both at 180 degrees (i.e. straight) wouldn't
be
- any worse than a 72 MHz RX with a perfectly straight antenna (which is
- pretty common.)
- Bigger problems that I see are that the range is limited (though
they
- haven't really said just how limited -- but from what I've heard
it's
- somewhere between 1000 and 3000 feet) and that if you have a carbon
- fiber fuselage, getting the antenna out of the fuse might be
- difficult. Note that the limited range might very well
exasberate any
- sub-optimal antenna orientations.
- Also, being that it's 2.4 GHz, I'd strongly suggest against putting
- any 2.4 GHz transmitters into your plane -- like any telemetry or
- video transmitter. Even if the exact frequencies used differ,
I'd
- still expect it to desense the RX and reduce the range even
more.
- I've never used one of the systems myself, but from what I've seen
- they work fine. The TX is a pretty basic computer radio, and
there's
- only six channels to work with so using it with a full house
glider
- will probably mean giving up some things, but I'll bet they're
just
- the thing at the slope with simpler planes.
- They'd also be nice for situations where you have what looks like
a
- great slope or site, but it's only a mile away from an established
- club and so you don't really dare flying there with traditional
- equipment.
- They need to hurry up and get a 8+ channel system with full range
and
- a more featured transmitter (either that or modules for existing
- radios.) It would be like a license to print money ...
- --
- Doug McLaren, [EMAIL PROTECTED]
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