Specifications

Walkera receivers.
28.2.5. Which transmitters are compatible with my E-flight Blade CP
receiver?
The E-flight Blade CP transmitter uses negative shift, so any transmitter which can transmit
with negative shift, such as Futaba, Hitec, Airtronics and Multiplex, are compatible.
28.2.6. What is the difference between FM, PPM, and PCM?
Basically, FM is frequency modulation, which is the method used to send the data.
PPM is pulse-position modulation, which is an analog method of encoding the data to be sent.
PCM is pulse code modulation, which is a digital method of encoding the data to be sent.
Both PPM and PCM send the data using FM, but encode the data differently.
For more info see:
www.aerodesign.de/peter/2000/PCM/PCM_PPM_eng.html
davesrcflight.mysite.wanadoo-members.co.uk/frame_pages/radio_control_topics_frame2.htm
28.2.7. Can I use a JR/Graupner/Futaba/Robbe PCM reciever with my
JR/Graupner/Futaba/Robbe transmitter in PCM mode?
The Graupner transmitter/receivers are manufactured by JR so they are compatible with JR
equipment. The Robbe transmitter/receivers are manufactured by Futaba, so they are compat-
ible with Futaba equipment.
The Futaba and JR PCM standards are not compatible, so JR/Graupner PCM equipment is not
compatible with Futaba/Robbe PCM equipment.
Futaba has two incompatible PCM systems: an older PCM512 (9-bit) system and a newer
PCM1024 (10-bit) system. The newer Futaba transmitters only support PCM1024, and not
PCM512.
JR has two incompatible PCM systems: an older Z-PCM (9-bit) system and the new S-PCM
(10-bit) system. The newer JR transmitters support both Z-PCM and S-PCM standards.
28.2.8. Can I use a crystal from manufacturer X in my receiver from
manufacturer Y?
It may or may not work. If both manufacturers use the same intermediate frequency in their re-
ceivers, then the crystal may work. However, if the intermediate frequency is slightly different,
then the receiver will work erratically. Therefore, it is best to use a crystal from the same manu-
facturer as the receiver. Why risk a $100 crash to save $10?
See this URL for more info:
www.torreypinesgulls.org/Radios.htm
28.2.9. Can I use a single-conversion crystal in my dual-conversion re-
ceiver?
Frequently Asked Questions
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