Spektrum DX8 - 2011/06

Spektrum DX8
MICHAEL RAMSEY
A button can be a handy function control
for features such as throttle cut or a flight
timer. On the DX8 the button is also used
to initiate the receiver-bind process.
Switches are in easy reach.
Flaps and scale functions are popular
features to command with a control knob.
Six of the eight switches provided are the
three-position type that provide more dual
rate and exponential options.
Left: The DX8 features the latest in
ergonomics standards. Each gimbal is ballbearing
supported, with pinpoint aluminum
joysticks. Rubber side and rear grips add
comfort and security.
52 MODEL AVIATION
An advanced eight-channel
aircraft radio
system with
integrated
telemetry
SPEKTRUM STARTED making radios for aircraft at roughly
the time I began working for MA: six years ago. The introduction
included a product that literally couldn’t be lived without, only
we didn’t know it yet. And it featured digital spread spectrum
(DSS) technology; the hook was that piloting an RC aircraft
would be safer and more trouble free.
In fact, Spektrum pioneered a lot into one transmitter that, in
many ways, took out a significant amount of pilot-error issues.
This system literally started thinking for us, and that’s the true
goal of technology: to handle tasks that make the technology to
fly RC so that pilots can focus instead on flying the aircraft well.
The results of the company’s efforts spawned, quite naturally,
an evolution that the RC community demanded. So Spektrum
didn’t rest and continued to put more brains behind the 2.4 GHz
brawn that it currently calls “DSMX.”
Dedicated solely to the RC hobby, leaps in how Spektrum
radios communicate to models and pilots appear to have been
made at a rate that has not been experienced. We’re being spoiled.
The DX8 is an eight-channel system that includes a great deal
that you and I have requested, and it comes in a package that
enhances the experience of flying radio control. In addition, it
does so affordably. Beyond that, an included telemetry system
helps us manage our aeromodeling investment further, so that,
remarkably, our aircraft can talk back to us.
Maybe you haven’t sent Spektrum a note, but the option is
available. I distinctly remember the Spektrum website boldly
stating, “Tell us what features you want in your next radio.” The
DX7 was extremely popular at the time, and the new DX6i began
hitting local dealers alone and in RTF packages with models such
as the E-flite T-34 Mentor and Blade 400 3D helicopter.
06sig2.QXD_00MSTRPG.QXD 4/21/11 10:50 AM Page 52
June 2011 53
Warnings are programmed into the system
by popular default, including throttle and
flight-mode condition. Alerts can be
customized or added, such as for retract
switch position.
Securely padded under the snap-tight
cover is a 4.8-volt, 2000 mAh NiMH
transmitter pack. Also available is a
Spektrum 4000 mAh 2S Li-Poly pack
(item SPMB4000LPTX) that uses the
alternate foam spacer.
Real-time telemetry can be sent to the
high-resolution LCD screen during flight.
Critical data is available at a glance, and
audio or vibration alarms can be set when
status alerts occur.
Above: The Spektrum AR8000 receiver employs signal diversity
technology, is full range and high speed (11 milliseconds), and
has a position resolution factor of 2,048. All eight channels are
fully proportional.
Left: Spektrum includes a full-range TM1000 telemetry module
with the DX8. It can handle three status data points and X-Port
options. Available separately is the short-range TM1100 module
(item SPM9549).
Photos by the author
In response to the request on the
website, I asked Spektrum to include
telemetry in the next radio. By that time
the signal technology was more familiar to
me, and one of the values understood was
that DSS radios not only send a signal, but
they also listen for one—a specific
signal—which is part of the reason why
the technology works so well for RC. So if
current systems already talked back and
forth, why not include onboard status
information?
Previously we RC pilots had to be
somewhat psychokinetic, or at least be
able to do basic math, to “know” during a
flight-system status. But similar to the
frequency channel control that is no
longer necessary, telemetry information
takes the wonder out of critical aircraft
condition and makes it easier for us to
enjoy piloting a model.
The DX8 used for this review came
with an AR8000 full-range receiver and
full-range TM1000 telemetry module kit.
A reflection of trends, the DX8 is not
available with servos. However, any servo
with a three-wire lead and Uni connector
will work with the included receiver.
A thick instruction manual is nested in
the attractive, high-quality packaging. The
directions are printed in five languages
and make the information appear more
complicated; open the book anyway. The
material is actually easy to digest.
The section you and I need is
approximately 40 pages. It covers, in a
compressed fashion, airplane and
helicopter pilot information about the
system and program capabilities.
Get a Grip: The DX8 is new, yet in some
ways it is familiar. The transmitter case
itself is incredibly light but has a nice feel
in hand, which I attribute to rubberized
case sides and rear grips. No other
transmitter felt this good in my hands.
Balance is important with the
transmitter. The DX8 case will hang level
at the neck-strap clip centered on the case.
So if you don’t use a strap, which I don’t,
holding the transmitter for hours isn’t a
daunting thought.
Merely a 4.8-volt NiMH battery pack
powers the DX8, and its capacity is a
whopping 2000 mAh. That’s part of what
makes the transmitter so light.
It surprised me that the transmitter
battery charger is inside the transmitter.
To activate it, connect the supplied 14-volt
international power supply to the unique
charge jack in the right-hand side.
The charge system needs to be
monitored when used with the NiMH
battery. It regulates 200 mA continuously
and indicates charge operation with a blue
LED behind the orange Spektrum logoshaped
lamp on the front of the case. That
charge rate will make batteries warm if
06sig2.QXD_00MSTRPG.QXD 4/21/11 10:52 AM Page 53
54 MODEL AVIATION
Specifications
Item number: SPM8800
Type: DSM2/DSMX digital spread
spectrum computer radio
Skill: All airplane and helicopter pilots
Number of channels: Eight
Model memory: 30 (internal)
Frequency: 2.4 GHz
Modulation: DSM2/DSMX
Channel resolution: 2,048
Modes: selectable one, two, three, or four
Power supply: 4.8- to 7.4-volt NiMH
or Li-Poly
Current drain: 108 mA (115 mA with
backlighting)
Frame rate: 11-22 milliseconds
Trim type: Digital, six provided
Gimbal type: Quad ball-bearing/
adjustable
View screen: 128 x 64 backlit LCD
Program input: Roller button, two
input buttons
Trainer function: Included
Command array: Eight switches, one
button, one knob
Included: 14-volt DC power supply,
receiver, telemetry, SC card
Charger: AC 110-220 input/14-volt DC
output
Price (as tested): $429.99
Pluses and Minuses
+
• Flight log and telemetry compatible.
• Includes SD card for instant updates
and enhancements.
• Advanced ergonomics.
• Online community support.
• Intuitive programming language. -•
Brief instruction manual is cluttered
with translations.
• Built-in charger does not sense NiMH
status (but does with Li-Poly).
• No sailplane-specific programming.
Items Included
• TM1000 DSMX full-range aircraft
telemetry module
• 14-volt International Power Supply
• 2.5-inch aircraft telemetry data lead
• 2.5-inch aircraft Telemetry Y-harness
• Telemetry voltage sensor
• Telemetry temperature sensor
• Spektrum AR8000 eight-channel DSMX
receiver
• 2000 mAh, 4.8-volt NiMH transmitter
battery pack
• DX8 neck strap
• Decal sheet
• Male/female bind plug with lanyard
• Getting-started guide
• User guide
Top Features
• Eight wing types, five tail types
• Five-point throttle curve
• Six programmable mixes
• Active governor programming
• Five swashplate types
• Electronic E-ring
• Active servo monitor
• Telemetry audio and vibration alerts
• Dual rate and exponential
• User-adjustable control modes
• User-defined switch assignment
• Channel renaming
• Selectable trim steps
• Throttle cut
• Simple scroll programming
• Quad-bearing gimbals
• Online community support
• Instant updates and model presets
available
The charger is actually inside the transmitter. The universal power
source supplies 12-14 volts of DC power that’s regulated down to
200 mA. Four international outlet adapters are in the box.
The functional and user-friendly roller button permits access to
the two menu systems. Action of this function illuminates the
LCD screen.
A high-end feature of this system that’s sure
to be copied is the SD memory card slot.
Through a PC card reader, updates,
enhancements, and model memory sharing
and storage are possible. Model presets are
also available.
06sig2.QXD_00MSTRPG.QXD 4/21/11 10:54 AM Page 54
left alone too long, so the user needs to
regulate replenishment.
The transmitter will accept a 7.4-volt
Li-Poly pack, and Spektrum makes a 4000
mAh version especially for the DX8. The
same rate of charge goes to the Li-Poly,
but the charge circuitry steps up and will
cut the input power to the pack when
sensors detect a full condition—or so I
understand. I haven’t tried a Lithium
battery in this system yet.
The switch-array layout is familiar to
me; therefore, I’m extraordinarily happy
with the four three-position and two twoposition
switch availability. The top button
on the left is a nice option, and besides
working the bind condition function, I’ve
also found it useful to activate the timer. I
guess it could also be good as a bomb-drop
switch.
Another thing I’m happy about with the
DX8 is that the switches have default
locations familiar to Spektrum users. But if
you have your own “thing,” all of the
switches can be reassigned to do whatever.
Likewise with the main controls
themselves—the joysticks. Both can be
mechanically tailored fit to length and
tension.
A nice feature of the transmitter-case
design is that taking the halves apart to
adjust resistance of the ball-bearingsupported
gimbals is unnecessary. Under
the rear rubber grips is access to the
adjustment screws. I also like that the
throttle lever can be a custom mix of
resistance and ratchet.
By the way, no matter what mode you
fly, the DX8 can accommodate. (Mode 2 is
standard.)
Geek—Not Greek: I’ve had every
Spektrum computer radio, and the constant
has been programming that’s human. The
company calls it “AirWare,” which I guess
makes sense, but the point is that even the
average RC pilot can probably program the
radio without picking up the manual. All I
did was play with the “SimpleScroll”
wheel and the two push buttons and
June 2011 55
AR8000 Receiver Specifications
Modulation: DSM2/DSMX
Band: 2.4 GHz
Weight: 0.33 ounce
Size: 1.35 inches long, 1.27 inches wide,
0.45 inch high
Voltage range: 3.5-9.6 volts
Frame rate: 11-22 milliseconds
Resolution: 2,048
Intention: Full-range aircraft
Options: Flight log and telemetry
Spektrum claims (see its advertising) to be the leader in spread spectrum
technology. Because the company develops only 2.4 GHz technology for RC
hobbyists, its understanding of our needs appears to be well tuned. I don’t
know if Spektrum is, in fact, the best, but its approach to my needs as an RC
pilot is exceptional.
The fact that the commands we put into a transmitter faithfully translate to
what we want an aircraft to do gives us the confidence to explore the world of
RC. It’s all I initially asked of a transmitter in the first place. The rest is really
“gravy,” and spread spectrum technology has actually given us much more
than a clear signal. For details about that, visit the Spektrum website.
The development of 2.4 GHz systems has made it possible for RC flying
events to be more fun and successful. When was the last time you heard the
cry, “I don’t have it!”?
Signal loss seems to be a problem of the past, thankfully, and I feel better
piloting a model at a crowded fly-in or contest. And the fun of going to an
event has been enhanced enough that I’ve planned to attend more.
Five years ago, Spektrum’s unique use of the 2.4 GHz frequency band
addressed the needs of the RC hobby/sport. Things were different; we didn’t
fly as much as we do today. Today, thanks to digital spread spectrum, we
have crowded the airways at large gatherings such as the Joe Nall Fly-In and
IRCHA Jamboree.
Events have been congested enough that Spektrum’s DSM2 systems did
experience limited operation. Pilots who recognized the environment simply
adapted their schedules to fly when airspace was more open.
Without compromising the wideband agility that the Spektrum signal
foundation delivers, DSMX technology was developed to withstand
oversaturated 2.4 GHz flying conditions. Best of all, this technology is
forward- and backward-compatible. If you have the DX8, the upgrade to
DSMX is simply an “AirWare” software update you can download right now.
Flying at a packed event (with 100 or more pilots) has proven to be more
secure with frequency hopping. Nobody has to update to DSMX. But if you
buy a DSMX Spektrum receiver, it will talk to your transmitter broadcasting
on DSM2. If you are an event hopper such as I am and want the advantages of
frequency hopping agility, which DSMX stuff does, you need to update your
DX8 and bind it to a DSMX receiver.
All new Spektrum and JR 2.4 GHz radios and receivers should be sold as
DSMX-compatible as I am writing this. If you don’t participate in crowd
events, updating your equipment is unnecessary. And all accounts have been
that flying on DSM2 feels the same to the RC pilot as flying on DSMX does.
Spektrum’s modification of its signal technology is a natural evolution.
What I appreciate as a faithful customer is that the upgrade didn’t outmode
my previous investment in having fun with RC aircraft. MA
—Michael Ramsey
DSMX to Me
Spektrum advanced its wideband technology with a software
update that’s free to DX8 owners. DSMX software is crosscompatible.
06sig2.QXD_00MSTRPG.QXD 4/21/11 10:54 AM Page 55
effortlessly navigated the system.
Two programming menus are reached
in easy but distinctive ways. The system
menu is accessed primarily to change
models or program a new model, and you
do so by pressing the SimpleScroll wheel
and switching on the power. Completely
navigating the system menu on a new
model makes setup go quickly, so don’t
skip any part of it.
Through the system menu you’ll tell
the radio exactly what type of helicopter
or airplane you have, essentially by telling
it how many servos are used and where
they’re located. Once you’ve done that,
the system tells the setup menu, in effect,
what to turn on and what to leave off.
As does a modern cell phone, the DX8
does much of the thinking for you. That
makes using the technology easier and
safer in the end.
If the AirWare does something you
don’t like and separates the dual rate
switches, you can put them all on one, as I
do—similar to my own version of flight
mode. Multiple rates and exponential rates
are available, as are actual flight modes
that not only condition the surface control
desired, but also do so with the trim
position and any other mixing.
The use of flight modes would make an
article in itself, but the great advantage to
using them is that, in short, at the flip of a
switch you can have a different-feeling
aircraft to perform 3-D vs. precision or
hotdog vs. trainer. The functionality of
flight modes is as endless as user
preferences are. This function on this
system is outstanding and simple to
execute.
The DX8 is the first RC transmitter to
be equipped with a vibrating alarm.
Again, similar to a cell phone, you can
customize alerts such as low battery
voltage, and these notifications can not
only squawk a tone, but can also buzz and
vibrate. If the “buzz” isn’t your thing, all
of the alarms and timers can be fixed to
your liking.
I didn’t like that the default helicopter
alarm sounded if the transmitter was
turned on with throttle-hold activated. I
purposely turn it on that way, for safety,
even though it’s redundant. I changed that
default in the system menu, but I like the
flight-mode and throttle-stick-position
alarms; I leave those to both squawk and
buzz.
I can’t preach that the DX8 is the
perfect radio. Spektrum doesn’t seem to
make that claim either; if it did, my
favorite of all favorite features—the
Spektrum Data Interface (SDI)—would
have probably never been offered.
Back to the cell phone reference, SDI
pertains to the access slot in the left-hand
side for the SD memory card. Included
with the DX8 is a common 128-megabyte
card that has multiple uses. What I
appreciate the most is that SDI permits
instant AirWare updates and
enhancements. Likewise, beyond the 30-
model internal storage, more aircraft can
be stored on the card.
Models can also be shared with the
card; Spektrum even offers aircraft presets
that can be downloaded to facilitate quick
setup such as those offered as Bind-N-Fly.
You must be a member of the
Spektrum Community to make the most of
SDI. It takes only a few minutes online to
follow a registration process, and a
compatible SD card reader on your PC is
required. AirWare maintenance alerts are
emailed to registered users, so staying up
to date is effortless.
The built-in telemetry feature on the
DX8 allows you to receive real-time
information about such things as a model’s
battery voltage, signal quality, engine or
motor temperature, and more. And it all
appears on the big, backlit LCD screen.
The aircraft is essentially talking back
to you with critical information. You
might be confident that the onboard
battery is a certain condition, but
telemetry confirms the facts and alerts you
when a surprise condition occurs. It’s nice
not to have to guess whether or not my
batteries are handling the flight loads I
have imposed on them.
Provided sensors measure voltage,
temperature, and signal status. The included
TM1000 has full range and enough ports to
measure a total of four status conditions.
Telemetry helps me know the aircraft
condition rather than rely on faith.
An RC pilot owes it to his or her
fellow aeromodelers to know the status of
an active aircraft at all times. Imagine the
crashes you can prevent with the
information that the DX8 can provide.
I don’t have to know how Spektrum
technology works to appreciate it. To this
date I have operated 10 aircraft—fixedwing
and rotor-wing types—with my
DX8. Not a glitch or error has been
detected. I’ve flown electric-powered
models in crowded indoor conditions and
glow-powered aircraft as far out as the eye
could see.
During the four months of testing,
Spektrum released four AirWare updates
that cured software issues and enhanced
and added features to the transmitter. I’ve
casually gotten to know the radio by
simply exploring the controls and program
features. It has helped me learn and try
new aspects of RC that seemed too
challenging before.
“What more could I want in a radio?”
is now a harder to answer question than
ever. MA
Michael Ramsey
[email protected]
Manufacturer/Distributor:
Spektrum RC/Horizon Hobby
4105 Fieldstone Rd.
Champaign IL 61822
(800) 338-4639
www.spektrumrc.com
56 MODEL AVIATION
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06sig2.QXD_00MSTRPG.QXD 4/21/11 10:55 AM Page 56

Spektrum DX8
MICHAEL RAMSEY
A button can be a handy function control
for features such as throttle cut or a flight
timer. On the DX8 the button is also used
to initiate the receiver-bind process.
Switches are in easy reach.
Flaps and scale functions are popular
features to command with a control knob.
Six of the eight switches provided are the
three-position type that provide more dual
rate and exponential options.
Left: The DX8 features the latest in
ergonomics standards. Each gimbal is ballbearing
supported, with pinpoint aluminum
joysticks. Rubber side and rear grips add
comfort and security.
52 MODEL AVIATION
An advanced eight-channel
aircraft radio
system with
integrated
telemetry
SPEKTRUM STARTED making radios for aircraft at roughly
the time I began working for MA: six years ago. The introduction
included a product that literally couldn’t be lived without, only
we didn’t know it yet. And it featured digital spread spectrum
(DSS) technology; the hook was that piloting an RC aircraft
would be safer and more trouble free.
In fact, Spektrum pioneered a lot into one transmitter that, in
many ways, took out a significant amount of pilot-error issues.
This system literally started thinking for us, and that’s the true
goal of technology: to handle tasks that make the technology to
fly RC so that pilots can focus instead on flying the aircraft well.
The results of the company’s efforts spawned, quite naturally,
an evolution that the RC community demanded. So Spektrum
didn’t rest and continued to put more brains behind the 2.4 GHz
brawn that it currently calls “DSMX.”
Dedicated solely to the RC hobby, leaps in how Spektrum
radios communicate to models and pilots appear to have been
made at a rate that has not been experienced. We’re being spoiled.
The DX8 is an eight-channel system that includes a great deal
that you and I have requested, and it comes in a package that
enhances the experience of flying radio control. In addition, it
does so affordably. Beyond that, an included telemetry system
helps us manage our aeromodeling investment further, so that,
remarkably, our aircraft can talk back to us.
Maybe you haven’t sent Spektrum a note, but the option is
available. I distinctly remember the Spektrum website boldly
stating, “Tell us what features you want in your next radio.” The
DX7 was extremely popular at the time, and the new DX6i began
hitting local dealers alone and in RTF packages with models such
as the E-flite T-34 Mentor and Blade 400 3D helicopter.
06sig2.QXD_00MSTRPG.QXD 4/21/11 10:50 AM Page 52
June 2011 53
Warnings are programmed into the system
by popular default, including throttle and
flight-mode condition. Alerts can be
customized or added, such as for retract
switch position.
Securely padded under the snap-tight
cover is a 4.8-volt, 2000 mAh NiMH
transmitter pack. Also available is a
Spektrum 4000 mAh 2S Li-Poly pack
(item SPMB4000LPTX) that uses the
alternate foam spacer.
Real-time telemetry can be sent to the
high-resolution LCD screen during flight.
Critical data is available at a glance, and
audio or vibration alarms can be set when
status alerts occur.
Above: The Spektrum AR8000 receiver employs signal diversity
technology, is full range and high speed (11 milliseconds), and
has a position resolution factor of 2,048. All eight channels are
fully proportional.
Left: Spektrum includes a full-range TM1000 telemetry module
with the DX8. It can handle three status data points and X-Port
options. Available separately is the short-range TM1100 module
(item SPM9549).
Photos by the author
In response to the request on the
website, I asked Spektrum to include
telemetry in the next radio. By that time
the signal technology was more familiar to
me, and one of the values understood was
that DSS radios not only send a signal, but
they also listen for one—a specific
signal—which is part of the reason why
the technology works so well for RC. So if
current systems already talked back and
forth, why not include onboard status
information?
Previously we RC pilots had to be
somewhat psychokinetic, or at least be
able to do basic math, to “know” during a
flight-system status. But similar to the
frequency channel control that is no
longer necessary, telemetry information
takes the wonder out of critical aircraft
condition and makes it easier for us to
enjoy piloting a model.
The DX8 used for this review came
with an AR8000 full-range receiver and
full-range TM1000 telemetry module kit.
A reflection of trends, the DX8 is not
available with servos. However, any servo
with a three-wire lead and Uni connector
will work with the included receiver.
A thick instruction manual is nested in
the attractive, high-quality packaging. The
directions are printed in five languages
and make the information appear more
complicated; open the book anyway. The
material is actually easy to digest.
The section you and I need is
approximately 40 pages. It covers, in a
compressed fashion, airplane and
helicopter pilot information about the
system and program capabilities.
Get a Grip: The DX8 is new, yet in some
ways it is familiar. The transmitter case
itself is incredibly light but has a nice feel
in hand, which I attribute to rubberized
case sides and rear grips. No other
transmitter felt this good in my hands.
Balance is important with the
transmitter. The DX8 case will hang level
at the neck-strap clip centered on the case.
So if you don’t use a strap, which I don’t,
holding the transmitter for hours isn’t a
daunting thought.
Merely a 4.8-volt NiMH battery pack
powers the DX8, and its capacity is a
whopping 2000 mAh. That’s part of what
makes the transmitter so light.
It surprised me that the transmitter
battery charger is inside the transmitter.
To activate it, connect the supplied 14-volt
international power supply to the unique
charge jack in the right-hand side.
The charge system needs to be
monitored when used with the NiMH
battery. It regulates 200 mA continuously
and indicates charge operation with a blue
LED behind the orange Spektrum logoshaped
lamp on the front of the case. That
charge rate will make batteries warm if
06sig2.QXD_00MSTRPG.QXD 4/21/11 10:52 AM Page 53
54 MODEL AVIATION
Specifications
Item number: SPM8800
Type: DSM2/DSMX digital spread
spectrum computer radio
Skill: All airplane and helicopter pilots
Number of channels: Eight
Model memory: 30 (internal)
Frequency: 2.4 GHz
Modulation: DSM2/DSMX
Channel resolution: 2,048
Modes: selectable one, two, three, or four
Power supply: 4.8- to 7.4-volt NiMH
or Li-Poly
Current drain: 108 mA (115 mA with
backlighting)
Frame rate: 11-22 milliseconds
Trim type: Digital, six provided
Gimbal type: Quad ball-bearing/
adjustable
View screen: 128 x 64 backlit LCD
Program input: Roller button, two
input buttons
Trainer function: Included
Command array: Eight switches, one
button, one knob
Included: 14-volt DC power supply,
receiver, telemetry, SC card
Charger: AC 110-220 input/14-volt DC
output
Price (as tested): $429.99
Pluses and Minuses
+
• Flight log and telemetry compatible.
• Includes SD card for instant updates
and enhancements.
• Advanced ergonomics.
• Online community support.
• Intuitive programming language. -•
Brief instruction manual is cluttered
with translations.
• Built-in charger does not sense NiMH
status (but does with Li-Poly).
• No sailplane-specific programming.
Items Included
• TM1000 DSMX full-range aircraft
telemetry module
• 14-volt International Power Supply
• 2.5-inch aircraft telemetry data lead
• 2.5-inch aircraft Telemetry Y-harness
• Telemetry voltage sensor
• Telemetry temperature sensor
• Spektrum AR8000 eight-channel DSMX
receiver
• 2000 mAh, 4.8-volt NiMH transmitter
battery pack
• DX8 neck strap
• Decal sheet
• Male/female bind plug with lanyard
• Getting-started guide
• User guide
Top Features
• Eight wing types, five tail types
• Five-point throttle curve
• Six programmable mixes
• Active governor programming
• Five swashplate types
• Electronic E-ring
• Active servo monitor
• Telemetry audio and vibration alerts
• Dual rate and exponential
• User-adjustable control modes
• User-defined switch assignment
• Channel renaming
• Selectable trim steps
• Throttle cut
• Simple scroll programming
• Quad-bearing gimbals
• Online community support
• Instant updates and model presets
available
The charger is actually inside the transmitter. The universal power
source supplies 12-14 volts of DC power that’s regulated down to
200 mA. Four international outlet adapters are in the box.
The functional and user-friendly roller button permits access to
the two menu systems. Action of this function illuminates the
LCD screen.
A high-end feature of this system that’s sure
to be copied is the SD memory card slot.
Through a PC card reader, updates,
enhancements, and model memory sharing
and storage are possible. Model presets are
also available.
06sig2.QXD_00MSTRPG.QXD 4/21/11 10:54 AM Page 54
left alone too long, so the user needs to
regulate replenishment.
The transmitter will accept a 7.4-volt
Li-Poly pack, and Spektrum makes a 4000
mAh version especially for the DX8. The
same rate of charge goes to the Li-Poly,
but the charge circuitry steps up and will
cut the input power to the pack when
sensors detect a full condition—or so I
understand. I haven’t tried a Lithium
battery in this system yet.
The switch-array layout is familiar to
me; therefore, I’m extraordinarily happy
with the four three-position and two twoposition
switch availability. The top button
on the left is a nice option, and besides
working the bind condition function, I’ve
also found it useful to activate the timer. I
guess it could also be good as a bomb-drop
switch.
Another thing I’m happy about with the
DX8 is that the switches have default
locations familiar to Spektrum users. But if
you have your own “thing,” all of the
switches can be reassigned to do whatever.
Likewise with the main controls
themselves—the joysticks. Both can be
mechanically tailored fit to length and
tension.
A nice feature of the transmitter-case
design is that taking the halves apart to
adjust resistance of the ball-bearingsupported
gimbals is unnecessary. Under
the rear rubber grips is access to the
adjustment screws. I also like that the
throttle lever can be a custom mix of
resistance and ratchet.
By the way, no matter what mode you
fly, the DX8 can accommodate. (Mode 2 is
standard.)
Geek—Not Greek: I’ve had every
Spektrum computer radio, and the constant
has been programming that’s human. The
company calls it “AirWare,” which I guess
makes sense, but the point is that even the
average RC pilot can probably program the
radio without picking up the manual. All I
did was play with the “SimpleScroll”
wheel and the two push buttons and
June 2011 55
AR8000 Receiver Specifications
Modulation: DSM2/DSMX
Band: 2.4 GHz
Weight: 0.33 ounce
Size: 1.35 inches long, 1.27 inches wide,
0.45 inch high
Voltage range: 3.5-9.6 volts
Frame rate: 11-22 milliseconds
Resolution: 2,048
Intention: Full-range aircraft
Options: Flight log and telemetry
Spektrum claims (see its advertising) to be the leader in spread spectrum
technology. Because the company develops only 2.4 GHz technology for RC
hobbyists, its understanding of our needs appears to be well tuned. I don’t
know if Spektrum is, in fact, the best, but its approach to my needs as an RC
pilot is exceptional.
The fact that the commands we put into a transmitter faithfully translate to
what we want an aircraft to do gives us the confidence to explore the world of
RC. It’s all I initially asked of a transmitter in the first place. The rest is really
“gravy,” and spread spectrum technology has actually given us much more
than a clear signal. For details about that, visit the Spektrum website.
The development of 2.4 GHz systems has made it possible for RC flying
events to be more fun and successful. When was the last time you heard the
cry, “I don’t have it!”?
Signal loss seems to be a problem of the past, thankfully, and I feel better
piloting a model at a crowded fly-in or contest. And the fun of going to an
event has been enhanced enough that I’ve planned to attend more.
Five years ago, Spektrum’s unique use of the 2.4 GHz frequency band
addressed the needs of the RC hobby/sport. Things were different; we didn’t
fly as much as we do today. Today, thanks to digital spread spectrum, we
have crowded the airways at large gatherings such as the Joe Nall Fly-In and
IRCHA Jamboree.
Events have been congested enough that Spektrum’s DSM2 systems did
experience limited operation. Pilots who recognized the environment simply
adapted their schedules to fly when airspace was more open.
Without compromising the wideband agility that the Spektrum signal
foundation delivers, DSMX technology was developed to withstand
oversaturated 2.4 GHz flying conditions. Best of all, this technology is
forward- and backward-compatible. If you have the DX8, the upgrade to
DSMX is simply an “AirWare” software update you can download right now.
Flying at a packed event (with 100 or more pilots) has proven to be more
secure with frequency hopping. Nobody has to update to DSMX. But if you
buy a DSMX Spektrum receiver, it will talk to your transmitter broadcasting
on DSM2. If you are an event hopper such as I am and want the advantages of
frequency hopping agility, which DSMX stuff does, you need to update your
DX8 and bind it to a DSMX receiver.
All new Spektrum and JR 2.4 GHz radios and receivers should be sold as
DSMX-compatible as I am writing this. If you don’t participate in crowd
events, updating your equipment is unnecessary. And all accounts have been
that flying on DSM2 feels the same to the RC pilot as flying on DSMX does.
Spektrum’s modification of its signal technology is a natural evolution.
What I appreciate as a faithful customer is that the upgrade didn’t outmode
my previous investment in having fun with RC aircraft. MA
—Michael Ramsey
DSMX to Me
Spektrum advanced its wideband technology with a software
update that’s free to DX8 owners. DSMX software is crosscompatible.
06sig2.QXD_00MSTRPG.QXD 4/21/11 10:54 AM Page 55
effortlessly navigated the system.
Two programming menus are reached
in easy but distinctive ways. The system
menu is accessed primarily to change
models or program a new model, and you
do so by pressing the SimpleScroll wheel
and switching on the power. Completely
navigating the system menu on a new
model makes setup go quickly, so don’t
skip any part of it.
Through the system menu you’ll tell
the radio exactly what type of helicopter
or airplane you have, essentially by telling
it how many servos are used and where
they’re located. Once you’ve done that,
the system tells the setup menu, in effect,
what to turn on and what to leave off.
As does a modern cell phone, the DX8
does much of the thinking for you. That
makes using the technology easier and
safer in the end.
If the AirWare does something you
don’t like and separates the dual rate
switches, you can put them all on one, as I
do—similar to my own version of flight
mode. Multiple rates and exponential rates
are available, as are actual flight modes
that not only condition the surface control
desired, but also do so with the trim
position and any other mixing.
The use of flight modes would make an
article in itself, but the great advantage to
using them is that, in short, at the flip of a
switch you can have a different-feeling
aircraft to perform 3-D vs. precision or
hotdog vs. trainer. The functionality of
flight modes is as endless as user
preferences are. This function on this
system is outstanding and simple to
execute.
The DX8 is the first RC transmitter to
be equipped with a vibrating alarm.
Again, similar to a cell phone, you can
customize alerts such as low battery
voltage, and these notifications can not
only squawk a tone, but can also buzz and
vibrate. If the “buzz” isn’t your thing, all
of the alarms and timers can be fixed to
your liking.
I didn’t like that the default helicopter
alarm sounded if the transmitter was
turned on with throttle-hold activated. I
purposely turn it on that way, for safety,
even though it’s redundant. I changed that
default in the system menu, but I like the
flight-mode and throttle-stick-position
alarms; I leave those to both squawk and
buzz.
I can’t preach that the DX8 is the
perfect radio. Spektrum doesn’t seem to
make that claim either; if it did, my
favorite of all favorite features—the
Spektrum Data Interface (SDI)—would
have probably never been offered.
Back to the cell phone reference, SDI
pertains to the access slot in the left-hand
side for the SD memory card. Included
with the DX8 is a common 128-megabyte
card that has multiple uses. What I
appreciate the most is that SDI permits
instant AirWare updates and
enhancements. Likewise, beyond the 30-
model internal storage, more aircraft can
be stored on the card.
Models can also be shared with the
card; Spektrum even offers aircraft presets
that can be downloaded to facilitate quick
setup such as those offered as Bind-N-Fly.
You must be a member of the
Spektrum Community to make the most of
SDI. It takes only a few minutes online to
follow a registration process, and a
compatible SD card reader on your PC is
required. AirWare maintenance alerts are
emailed to registered users, so staying up
to date is effortless.
The built-in telemetry feature on the
DX8 allows you to receive real-time
information about such things as a model’s
battery voltage, signal quality, engine or
motor temperature, and more. And it all
appears on the big, backlit LCD screen.
The aircraft is essentially talking back
to you with critical information. You
might be confident that the onboard
battery is a certain condition, but
telemetry confirms the facts and alerts you
when a surprise condition occurs. It’s nice
not to have to guess whether or not my
batteries are handling the flight loads I
have imposed on them.
Provided sensors measure voltage,
temperature, and signal status. The included
TM1000 has full range and enough ports to
measure a total of four status conditions.
Telemetry helps me know the aircraft
condition rather than rely on faith.
An RC pilot owes it to his or her
fellow aeromodelers to know the status of
an active aircraft at all times. Imagine the
crashes you can prevent with the
information that the DX8 can provide.
I don’t have to know how Spektrum
technology works to appreciate it. To this
date I have operated 10 aircraft—fixedwing
and rotor-wing types—with my
DX8. Not a glitch or error has been
detected. I’ve flown electric-powered
models in crowded indoor conditions and
glow-powered aircraft as far out as the eye
could see.
During the four months of testing,
Spektrum released four AirWare updates
that cured software issues and enhanced
and added features to the transmitter. I’ve
casually gotten to know the radio by
simply exploring the controls and program
features. It has helped me learn and try
new aspects of RC that seemed too
challenging before.
“What more could I want in a radio?”
is now a harder to answer question than
ever. MA
Michael Ramsey
[email protected]
Manufacturer/Distributor:
Spektrum RC/Horizon Hobby
4105 Fieldstone Rd.
Champaign IL 61822
(800) 338-4639
www.spektrumrc.com
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