DPSI RV Family Operating Instructions Version 2.0
Page 13 of 48
3.1. HFIB (High Frequency Interference Blocking)
In order to increase safety, highly effective T-Filters are inserted in
DPSI RV systems for every
single servo (e.g. 32 pieces for DPSI RV).
Although this is more expensive than simple filtering the receiver
channels – disturbances are eliminated directly at the servo connector
and therefore do not run through the whole printed circuit board. These
filters reduce HF disturbances by up to 90% which can be “caught” by
long servo cables. Rings of ferrite, which were used until now, can be
omitted, which saves cost and weight.
Radio interference suppression of the DPSI RV is considerable more
effective than radio interference suppression by ferrite rings. Naturally,
error free operation of digital servos is possible with these deployed
filters, too.
3.2. APP (Advanced Push Pull Servo Pulse Amplification)
Each servo is provided with optimally prepared amplified pulses from
the receiver. Servo signals usually are weakened if servo cables are
connected in parallel (V-cable), which makes them interference prone.
The servo pulses stay fully maintained in DPSI RV systems, even if
four servos are connected on one channel. Short circuit proof ness to
the negative and positive lines is a specialty of the pulse amplification.
If a mistake happens during wiring, which short cuts the pulse wire of a
servo to negative or positive, the amplifiers are not destroyed and all
other servos even on the same channel continue their operation
problem free. An additional advantage is the current saving APP-
Technology. The amplifiers are based on Push Pull output stages,
which drive the low- as well as the high-phase of the servo pulse.
Herewith, the high switching current is not applicable like in
conventional open collector end stages, where the low phase of the
servo pulse is generated via a resistor as a “short cut current”.
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