µCHP Specifications
The µCHP Transmitter is a single-frequency, pulsed-CW transmitter, designed for operation in the 140 - 220MHz frequency range.
| Frequency Range | 140 - 220MHz (w/ 3rd Overtone micro-miniature shock crystal) |
|---|---|
| Frequency Tolerance |
±7ppm max @ 25°C ±25ppm max -0 < Temp < +60°C (<15ppm typical w/ 6:1VSWR variation - CHP-5P through -9P) (Optional: <7ppm typical w/ 6:1VSWR variation - available only w/ CHP-4P) (<5ppm typical over supply voltage range) |
| Temperature Range | -20° to +60° for the electronics1 |
| Power Control Component | Externally controllable by presence of a small magnet. |
| Current Requirement |
3.0mA typ peak ('on' state, during RF pulse 5µA typ quiescent current ('on state', between RF pulses) <2µA typ with magnet in place ('off' state) |
| RF Pulse Width |
15msec ±3msec typical at +25°C / 1.5V (18msec±4msec typical at 1.1V) (13msec±2msec typical at 1.8V) |
| Pulse Rate | Configurable from 20 to 300 beats per minute (Pulse Period 200 - 3000msec) |
| Spurious Output |
Coherent Spurs <-10dBc Non-coherent Spurs <-40dBc |
| Available Sensor | Temperature (Thermistor): ~ 0.1°C resolution with calibration |
| Dimensions (bare board) |
Crystal Piggyback: 0.25 x 0.30 x 0.22in Crystal End-Mounted: 0.25 x 0.49 x 0.09in |
| Packaging | Application Dependent - typically polymeric |
1. The defined temperature range is for the transmitter electronics only. Most small batteries used with the CHP cannot provide the required peak current and voltage below ~0°C. The battery used with the CHP-4P is suitable to -20°C.