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JR R649 9-Channel PCM RX | JR R649 Overview This receiver features Direct Servo Control (DSC) for control of servos without radio frequency output. has low current consumption and will fit into most model applications. JR R649 Key Features - ABC&W circuitry
- Credit card size design
- Low current consumption
Detailed Information JR has a unique signal processing system called ABC&W. ABC&W stands for
Automatic Blocking Circuit with Window. ABC&W systems have distinct advantages
over single or dual conversion receivers. ABC&W systems create a very small
electronic window that looks for the specific frequency that the receivers
crystal is on. Any signal that is off spec for this window is rejected, and then
the allowed signal is cleaned up, amplified, and re-routed through the window
many, many times till all that is left is the pure signal on the channel that is
coming from your transmitter and then sent on to the servos. This all takes
place without any noticeable delay of response from your stick movement to the
servo. This technology is the reason that JR can produce single conversion
receivers that have fewer components and weigh less than other single and dual
conversion receivers without the worry about outside interference. |
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What is PCM and PPM? |
| The PCM receiver is a digital receiver that
uses normal FM Frequency, but the signal is an encoded digital signal in which
the PCM receiver interprets it as commands. Since the signal is digital, if
there are any interference or the signal is poor, the PCM receiver can be
programmed to go into a fail-safe mode. In this mode, the servos will move to a
pre-programmed position until the signal comes back.
PPM receivers are the "standard" type of receiver for most
radios. Glitches in signal are immediately noticed by erratic movements of the
servos.
JR's computerised radios give you the best of both worlds with
each transmitter software switchable between PPM FM and PCM for superior
interference rejection.
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![[JRPR649] JR NER-649S PCM S 9 channel receiver w/crystal](jr_pic/jrpr649-250a.jpg)
