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NOTE: * ON during interband MAHO

Software Compensations

Power Levels (TXC) vs. Temperature

It is necessary to compensate the effect of temperature on the phone output power. To monitor this environment change, the temperature measurement is done by using a NTC resistor. A factor table is used for temperature compensation. The table contains common values for all power levels and operating modes. The table values are defined without factory measurements. The temperature is measured and right compensation value is added to the TXC-value. The requirement for compensation update is for every 1 minute or after every 5 degrees C of temperature change. This means, that during analog mode transmission there will be a need for temperature reading and TXC compensation update. Because of poor cooling of RF block and insufficient linearity in high temperatures, the output power is reduced from level 2 to level 2.5 when temperature inside the phone is above +55 C in analog mode and above +60 C in digital mode.

Power Levels (TXC) vs. Channel

The duplexer frequency response ripple is compensated by the software. The power levels are calibrated on four channels. The values for chan-

Technical Documentation System Module nels between these tuned channels are calculated by using linear interpolation.

Power levels vs. Battery Voltage

For saving battery capacity and because of insufficient linearity in digital mode, output power is decreased from level 2 to level 2.5, when battery voltage drops below 3.3V. (tbd.). The power reduction is done linearly as a function of battery voltage Vcc 3.3V ... 3.1V -> PL2 ... PL2.5.

TX Power Up/Down Ramps

The transmitter output power up/down ramps are controlled by the SW. A special ramp table is used for that. Requirement is for nine different ramps in digital mode for both operating bands and one ramp for analog mode. Separate ramps are used in power up and power down ramps.

Modulator Output Level

For optimum linearity and efficiency the output level of the modulator is adjusted in the production. The aGc amplifier is used as 2 dB step attenuator to define power levels. The 0 dB level is the production tuned reference level.

Digital Mode RSSI

Digital mode RSSI vs. input signal is calibrated in production, but RSSI vs. temperature and RSSI vs. channel are compensated by software.

System Module Technical Documentation

RF Block Specifications

Receiver

DAMPS 800 Mhz Front End

Parameter

Minimum

Typical / Nominal

Maximum

Unit / Notes

Gain, LNA gain enabled (gain variations vs temp. included)

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DIY Battery Repair

DIY Battery Repair

You can now recondition your old batteries at home and bring them back to 100 percent of their working condition. This guide will enable you to revive All NiCd batteries regardless of brand and battery volt. It will give you the required information on how to re-energize and revive your NiCd batteries through the RVD process, charging method and charging guidelines.

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