Experiments with Trimble's Lassen IQ

The Lassen IQ is a GPS receiver that is extremely power efficient. Here are some links:

• http://www.mikrocontroller.net/articles/GPS-Empfang_mit_Lassen_iQ

Here's a little theory on satellite navigation:

• http://lea.hamradio.si/~s53mv/navsats/theory.html

And here it is:

1 Experiments

1.1 APRS-Tracker

The challenge is to build a high performance tracker as power efficient and as space-efficient as it can be.

Ingredients:

• Trimble LassenIQ
• Trimble ANT
• OpenTracker SMT

Here's a photo of the OpenTracker SMT. It's really small:

The tracker's inner values:

• Voltage: DC 6.5 to 28V unregulated or 5V DC regulated
• Current: 8 mA idle, 20 mA transmitting Max 200 mA @ 5 V available for GPS
• Modes: 1200 bps AFSK (send and receive); 300 bps AFSK, PSK31 (send only)
• Radio Connector: pin header
• Serial Connector: pin header
• Dimensions: 31mm x 18mm x 5mm
• GPS interface: NMEA in/out

Pinout:

Pin  Name   Funktion
1    5VIN     Geregelter 5-Volt-Eingang
2    RxD      RS-232 Data in der (vom GPS oder Computer)
3    1Wire    Dallas 1-Draht-Bus für externe Sensoren
4    AOUT    Audio-Ausgang an Radio
5    ADC5    Analog-Eingang
6    T1CH1  Timer-Kanal
7    ADC6    Analog-Eingang
8    RST       Reset (active low)
9    ADC7    Analog-Eingang
10  IRQ-      Transmit-now, Profil wählen, oder Zähler
11  ADC8    Analog-Eingang
12  ADC9    Analog-Eingang
13  AIN       Audio-Eingang von Radio
14  ADC4    Analog-Eingang
15  ADC3    Analog-Eingang
16  TXD      RS-232 Data aus
17  rot        rot LED-Ausgang
18  grün     grün LED-Ausgang
19  ADC2    Analog-Eingang
20  ADC1    Analog-Eingang
21  PTT      Push-to-talk-Signal an Radio
22  REGOUT  Regulator-Ausgang - 5 Volt
23 GND      Ground
24 REGIN    Regulator-Eingang - 6,5 bis 28 Volt