Multiplex RX-7 SYNTH IPD Instructions page 11

! Note:
The receiver checks the operating voltage: the value must be
above 4.5 V immediately after it is switched on. If not, the re-
ceiver will not work until the voltage rises to a value above 4.8 V.
If this should happen, the LED lights up briefly, then stays off
until an operating voltage of more than 4.8 V is present:
LED Code 0 LED OFF
11. S RF
ETTING THE
With the RX-7-SYNTH IPD, RX-7-SYNTH DS IPD and RX-9-
SYNTH DS IPD compact receivers the RF channel is set by
means of an RF channel search, during which the receiver
searches for the most powerful transmitter on the band. For this
reason it is essential that your transmitter, set to the desired RF
channel, should be in the immediate vicinity of the model
(receiver) during the RF channel search. During the RF channel
search keep the receiver a reasonable distance (> approx. 3 m)
from other transmitters which are switched on.
Sequence
1. Switch on the transmitter, already set to the desired RF
channel,
Hold the receiver button pressed in,
Switch the receiver on,
Release the button.
The RF channel search commences; the LED flashes:
1,6 sec
LED Code 2
! Note:
The RF channel search generally takes about 2 - 4 seconds.
If the process takes significantly longer, this indicates that no
clear transmitter signal is present. Check that your trans-
mitter is switched on, and that no other transmitter is in the
immediate vicinity. Repeat Step 1.
2. The LED glows continuously when a transmitter is located:
LED Code 1 LED ON
3. Now move one transmitter stick four times steadily to the
same end-point. The LED should go OFF in time with the
stick movement. This is your means of checking that the
receiver has locked onto the correct RF channel.
The process is complete when the LED flashes the con-
firmation signal:
1,6 sec
LED Code 5
4. The receiver must now be switched off, then on again
( 10.); it will now be operating on the set RF channel.
The receiver stores the set RF channel permanently until either
you set a new RF channel, or RESET the receiver to the factory
default settings ( 15.).
! Note:
The signal output to the servo outputs remains switched off
during the RF channel search process, i.e. the servos do not
move and are "soft", and (modern) electronic speed controllers
stay OFF, because the signal is absent. Nevertheless, it makes
sense to secure the model and keep well clear of hazardous
parts.
11.1 Automatic servo channel count detection
When the RF channel is set, the receiver also detects the trans-
mitter's transmission format, i.e. how many servo channels are
transmitted (e.g. PPM 5, PPM 9), and stores this information.
The number of servo channels transmitted by the transmitter is a
criterion required by the IPD filter for detecting signal errors in
use.
Every time the receiver is switched on, it checks the servo
channel count and compares it to the stored value. If the two are
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Operating Instructions Receiver RX-7 SYNTH IPD
RX-7 SYNTH DS IPD / RX-9-SYNTH DS IPD compact – V 1.2x
CHANNEL
not the same, the receiver remains inactive.
LED Code 1 LED ON
! Note:
Every time there is a change in the transmitter's servo
channel count or operating mode (also when a different
transmitter is used), the RF channel must be re-set (
The FAIL-SAFE settings (
Changes to the transmitter's servo channel count or operating
mode are made as follows: with the MULTIPLEX ROYALevo by
changing the servo assignment (PPM 6, 7, 8, 9 or 12); with the
PROFI mc 3000/4000 series by changing the operating mode:
PPM 7, PPM 9.
11.2 Automatic Shift switching
This function only applies to the 72 MHz and 75 MHz ver-
sions of the MULTIPLEX RX-SYNTH receiver.
All MULTIPLEX RX-SYNTH IPD receivers can be operated with
positive Shift (e.g. MULTIPLEX, JR, AIRTRONICS) and negative
Shift (e.g. HiTEC, Futaba). By default the receivers are set to
positive Shift. If you wish to use a transmitter with negative Shift,
you must re-set the RF channel (
automatically sets itself to the appropriate Shift.
12. IPD (I
NTELLIGENT
The receivers feature an IPD decoder; the abbreviation IPD
stands for Intelligent Pulse Decoding. The "intelligence" takes
the form of a micro-processor which analyses the signals picked
up from the transmitter, processes them (where necessary) and
then passes them on to the servos. The received signals are not
simply passed on directly to the servos, as with conventional
FM/PPM receivers, but are checked for interference and validity.
The advantages of IPD technology:
1. Only permissible signals "get through"
IPD checks the signals for limit values: pulse widths within
the range 860 µsec and 2350 µsec are permissible. Most
radio control transmitters work within these limits, including
other makes of equipment.
2. "Invalid" signals are substituted (HOLD)
If an invalid signal is picked up, the receiver continues to
pass on the last received valid signal until a "good" signal is
received again (HOLD period). This suppresses interference,
or at least reduces its effects.
3. "Safety setting" in the case of total failure (FAIL-SAFE)
If no valid signal is picked up beyond the HOLD period (0.5
sec.) the IPD receiver moves the servos to a freely pro-
grammable setting (FAIL-SAFE position
to idle, control surfaces to neutral.
4. IPD monitors reception quality
The signal analysis process is automatically adjusted to suit
the current reception quality (field strength). Powerful signals
are passed on to the servos unchanged, but weak received
signals are "processed". The nominal servo positions are
then calculated from the last "good" signals. This greatly re-
duces the effect of interference, but the pilot remains aware
of the problem (unlike with PCM). He receives a warning,
and is able to react appropriately.
5. IPD is compatible
IPD works on the same basis as the current FM/PPM trans-
mission process. IPD receivers, with all their advantages,
can therefore be used with most RC systems.
13.) must also be set again!
11.). The receiver then
P D
ULSE ECODING
13.), e.g. motor
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11.).
)