ThingMagic Sargas User Guide
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11 Reader RF Power
During initial installation, the reader must be properly configured to use the correct RF power to comply
with FCC or other regional regulations. DO NOT increase the power beyond this level.
The Sargas supports separate read and write power level which are command adjustable via the
MercuryAPI. Power levels must be between:
– Minimum RF Power = 0 dBm
– Maximum RF Power = +30.0 dBm
Power Settings for Authorized Antennas and Cables
This device has been designed to operate with the antennas listed in Authorized Antennas list using the
cables in the 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 more information about setting the RF power, refer to Setting the Reader RF Power.
Note:
Be sure to read Compliance and IP Notices to maintain compliance with FCC or other applicable regional
regulations.
11.1 Setting the Reader RF Power
To set the Reader RF power:
1.
Log on to the Reader using your browser.
2. The Sargas Status Page appears, as shown in the
Figure 16
.
3.
Click on the Settings icon. Click on the “Reader” header. By default, the value for RF output power
is 30 dBm for all functions, on all antennas.
4.
Enter the maximum setting based on your cable type, length, and antenna type.
5.
Scroll down to the bottom of the screen and click Save changes button.
The Settings Page will reload automatically after the settings have been saved.
Optionally, the RF power may be set at a different level for read operations than for write operations or at a
different level per antenna.
12 Thermal Considerations
When transmitting at its highest RF power levels, the enclosure temperature of the Sargas reader will rise
just over 20 degrees C above the ambient temperature. Industry guidelines do not consider any surfaces
whose temperature is above 70 C to be safe to touch. If the Sargas reader is operated in free space, or
mounted to a material that is not thermally conductive, it should not be operated in an ambient
temperature greater than 48 degrees C.
To operate the Sargas reader in environments where the ambient temperature is higher than this (up to
the maximum specified operating temperature of +60 C), the reader must be mounted to a surface which
can limit its temperature rise above ambient to 10 degrees C. If no large thermally conductive surface is
