modulation: GFSK? code type: PPM/PCM?

Problems, experiences or just something to say about RC gear? Say it here.

modulation: GFSK? code type: PPM/PCM?

Postby davey » Sat Nov 19, 2011 9:30 pm

Hi, can someone tell me what this means and how it compares to other technologies?

also, are these radios the same?
http://www.hobbypartz.com/79p-th9x-r9b- ... radio.html
http://www.leaderhobby.com/product.asp?ID=9394001220239

thanks :)
davey
 
Posts: 2
Joined: Sat Nov 19, 2011 9:19 pm

Re: modulation: GFSK? code type: PPM/PCM?

Postby BillGriffiths100 » Sun Nov 20, 2011 4:54 pm

Gaussian Frequency-Shift Keying (GFSK) is a type of Frequency Shift Keying modulation that uses a Gaussian filter to smooth positive/negative frequency deviations, which represent a binary 1 or 0. It is used by DECT, Bluetooth[1], Cypress WirelessUSB, Nordic Semiconductor[2], Texas Instruments LPRF, z-wave and Wavenis devices. For basic data rate Bluetooth the minimum deviation is 115 kHz. (Source Wikipedia)
PPM in RC relates to the sending of information for servos by pulse width modulation.
PCM stands for pulse code modulation where the information is sent to the receiver as a digital code.
The hobbypartz radio is the same as the turnigy 9x from the same mfg.
The leader hobby one is using the same case and the same internal board but has the rf module removable which is an advantage if you want to use other modules such as frsky, without hacking the transmitter.
Compromising with out of control government is like living with a lion, sooner or later the bloody thing will eat you .

You accept the tyranny of the state when it's not being applied to you, when it is: it's too late.
User avatar
BillGriffiths100
 
Posts: 553
Joined: Mon Sep 20, 2010 2:04 pm
Location: London UK

Re: modulation: GFSK? code type: PPM/PCM?

Postby davey » Sun Nov 20, 2011 8:22 pm

fantastic thanks for the help!!
davey
 
Posts: 2
Joined: Sat Nov 19, 2011 9:19 pm


Return to Radios and Servos

Who is online

Users browsing this forum: No registered users and 5 guests