User's Manual

Viewsonic Tweety RF Remote Rev 2.9A November 05, 2001
Universal Electronics Inc. Confidential Page 44 of 63
5.1.3 Pulse Width Timing for RF Transmitter
Long Low: 108.0us (+/- 5%)
Long High: 102.0us (+/- 5%)
Short Low: 53.0us (+/- 5%)
Short High: 50.0us (+/- 5%)
5.1.4 RF Channel Operation Range
The remote shall communicate at a minimum distance of 5m in a direct line of site
5.1.5 RF Modulation Scheme and Modulation Level
Modulation Scheme
Frequency Shift Keying (FSK
Modulation Level
± 70 kHz (Nominal)
5.1.6 Maximum Bit Rate
9600 baud (bps)
5.1.7 RF Power Management
RF Power On
Allocate Frequency X
Tx Data Input X X
T1 T2
• T1 = Power On Stable Time. Typically, it should be T1 > 5ms
• T2 = Frequency Stable Time. Typically, it should be T2 > 20ms
5.1.8 Transmitter Data Input Level
The transmitter data input level should be fixed as the supply voltage drops when using battery. It
is required that the Input level will be Vp-p = 100mv (+/- 10%).
5.1.9 Communication Link
Simplex – one way communication from remote control unit to base unit.
SERIAL INPUT DATA TIMING