User's Guide

ThingMagic M6e User Guide 7
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Power Settings for Authorized Antennas and Cables
The M6e-A has been designed to operate with the antennas listed in Authorized Antennas list using the
cables in the M6e-A Authorized Cables list. For any combination of antenna and cable the maximum RF
power is determined from antenna gain (Max Linear Gain value from antenna list) and antenna cable loss
(Insertion Loss value from cable list) using the formula:
Pmax = 36 dBm - Antenna Gain + Cable Loss
For example, for the Laird S8658WPL and the ThingMagic CBL-P6 6ft cable the following calculation can
be performed:
Max linear antenna gain = 6 dBiL
Minimum cable insertion loss = 0.8 dB
Pmax = 36 - 6 + 0.8 = 30.8 dBm
The maximum RF power that may be set using this configuration is 30.8 dBm (see Warning above).
Power Supply Ripple
The following are the minimum requirements to avoid module damage and ensure performance and
regulatory specifications are met. Certain local regulatory specifications may require tighter specifications.
• 5 Volt +/- 5%.
• Less than 25 mV pk-pk ripple all frequencies.
• Less than 11 mV pk-pk ripple for frequencies less than 100 kHz.
• No spectral spike greater than 5 mV pk-pk in any 1 kHz band.
• Power supply switching frequency equal or greater than 500 kHz.
Power Consumption
The following table the power/transmit mode settings and power consumption specifications for the M6e.
Additional details about Power/Transmit Modes can be found in the Power Management section.
Caution: Operation in the EU Region (under ETSI regulatory specs) may need tighter ripple
specifications to meet ETSI mask requirements.
M6e Power Consumption
Operation
Power/Transmit Mode
RF Transmit
Power
Setting
(dBm)
Max
Power
1
(Watts)
Voltage
(Volts)
Current
(mA)
Transmit CW
Transmit Mode=DRM
+31.5
7.5
2
5.0 +/- 5% 1400
Tag Reading
Transmit Mode=DRM
+31.5
7.5
2
5.0 +/- 5% 1400