Analog Transmit Power Measurement Description
Last updated: October 28, 2004
How is an Analog Transmit Power measurement made?
Analog Transmit Power measures the mean power from the mobile at the test set's RF IN/OUT port when transmitting an analog carrier. The test set correctly measures the level with or without frequency modulation (FM) present to make AMPS power measurements. Tests can be made with the mobile in the analog test mode or when connected on an active voice channel. See IS-137A, section 3.2.1.1, Analog RF Power.
The trigger source for this measurement is always immediate.
Input Signal Requirements
The Analog Transmit Power measurement meets or exceeds specifications when the following requirements are met:
-
The frequency of the signal being measured must be in the range of 800 MHz to 960 MHz or 1.7 GHz to 2.0 GHz, and within 100 kHz of the expected frequency.
-
The signal level into the test set's RF IN/OUT connector must be in the range of -25 dBm to +43 dBm peak, and within 3 dBm of the expected input power to meet specifications. Results are provided for signals within +5 dB to -10 dB of the expected power, but performance is not warranted.
See
Active Cell Operating Mode
, and
Receiver Control
for information on setting the expected input frequency and power level.
Considerations When Making Manual Analog Transmit Power Measurements
When manually controlling the test set from the front panel, all measurements default to using continuous triggering. If you make digital measurements on a DTC using RF Rise or Protocol triggering, and then hand off to an AVC and select an analog measurement, the analog measurement may not trigger and display a result. This is because the digital measurement is still waiting for a burst transmission to trigger it (which it won't get from an analog signal) and therefore the measurements "freeze". To prevent this from happening when making analog measurements, either turn off the digital measurements or set their trigger source to Immediate.
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