I’ve been working my way through Build a Home Automation System for $100.  I was excited when I got to Module 11 – Connecting the Arduino, Unit 1 – Decoding RF Signals to Control Outlets (page 238).  I have a remote control outlet set (3 double outlets) that has been gathering dust for a year and some 433MHz RF transmitters and receivers in my parts cabinet.
Unfortunately, looking up the FCC ID: QJXTXTNRC that was printed on the remote indicated that the outlets operate at 315MHz.  A pack of 6 315Mhz RF Transmitter and Receivers was available on Amazon.ca so I ordered it up and it arrived just in time for the weekend.
Everything went smooth until the final moment of truth on page 254.  No response from the outlet.  I checked and double checked everything again.  No success.
Setting up a second Arduino with the IR receiver on it I could see that what I was transmitting was not the same as what I told it to do (or what the remote does).  The PulseLength read from the remote was 275 microseconds but from the Arduino RF transmitter it was reading 354 microseconds!!!
Remote1 ON

Decimal: 15040737 (24Bit) Binary: 111001011000000011100001 Tri-State: not applicable PulseLength: 275 microseconds Protocol: 1
Raw data: 8544,816,288,812,288,812,292,256,840,260,840,812,288,264,836,812,288,812,284,264,836,268,832,268,836,264,836,264,836,264,836,268,836,812,288,812,292,812,288,264,836,268,832,268,832,272,828,820,284,

ArduinoTransmitter1 ON

Decimal: 15040742 (24Bit) Binary: 111001011000000011100110 Tri-State: not applicable PulseLength: 354 microseconds Protocol: 1
Raw data: 10996,1012,436,984,448,20,448,280,20,1020,24,132,928,40,952,36,544,336,1128,1016,3000,68,216,688,536,492,1248,1112,1336,48,24,128,116,172,56,244,220,16,56,28,188,216,112,36,32,148,788,1720,76,

I checked the code and there was one and only one line in there with the correct PulseWidth value.

mySwitch.setPulseLength(275);

I experimented by subtracting the difference with this change:

mySwitch.setPulseLength(196);

The PulseLength read by the receiver was still 354 microsecond.  I even tried a setting the PulseLength = 1 and it read as 354.
I used the library rc-switch by sui77 Version 2.6.2.  Maybe I’ll try a different version tomorrow.
Any ideas?
Thx,
TekMason