Athena Clarification Questions

0611-EX-PL-2007 Text Documents

Athena Technologies Inc.

2007-10-31ELS_85627

8.3.28 Use of Fixed Devices that Re-Radiate Signals Received from a
GPS Antenna

8.3.28 Use of Fixed Devices That Re-Radiate Signals Received from the Global Positioning
System Except as otherwise authorized under Part 7.14, federal agencies and departments may,
under the following conditions, operate fixed devices that re-radiate signals received from the
Global Positioning System (GPS).

1. Individual authorization is for indoor use only, and is required for each device at a specific site.
YES

2. Applications for frequency assignment should be applied for as an XT station class with a note
indicating the device is to be used as an "Experimental RNSS Test Equipment for the purpose of
testing GPS receivers" and describing how the device will be used.
YES

3. Approved applications for frequency assignment will be entered in the GMF.
YES

4. The maximum length of the assignment will be two years, with possible renewal.
YES

5. The area of potential interference to GPS reception (e.g., military or contractor facility) has to
be under the control of the user.
YES

6. The maximum equivalent isotropically radiated power (EIRP) must be such that the calculated
emissions are no greater than -140 dBm/24 MHz as received by an isotropic antenna at a distance
of 100 feet (30 meters) from the building where the test is being conducted. The calculations
showing compliance with this requirement must be provided with the application for frequency
assignment and should be based on free space propagation with no allowance for additional
attenuation (e.g., building attenuation.)
SEE EXHIBITS—EIRP CALCULATION

7. GPS users in the area of potential interference to GPS reception must be notified that GPS
information may be impacted for periods of time.
YES

8. The use is limited to activity for the purpose of testing RNSS equipment/systems.
YES

9. A "Stop Buzzer" point of contact for the authorized device must be
identified and available at all times during GPS re-radiation operation of the device under any
condition.
YES—Contact Information is accurate and up-to-date.
Tom Ligon-Engineer 1-540-428-3321
tligon@athenati.com

EIRP CALCULATIONS

Receive Ant Repeater Repeater Ant Gain
Gain Ant Cable Insertion Loss Amp Gain Best Case Range in Feet Repeated Signal Power @ Range In dBm
30 -8 28 3 100 -143.09

GPS Carrier Frequency MHz Total System Gain Range in Miles Total Signal Power @ Range in Watts
1575 53 0.02 4.9E-18

Avg Receive Power L1 dBm North
America Range in Meters Radiated Power dBm
-130 31.17 -77

Free Space loss with Isotropic Range in
Antennas Kilometers Transmitted Power (W)
-66.09 0.03 10.0E-12

Effective Radiated Power (W)
20.0E-12

Effective Radiated Power (dBW)
-107

Document Created: 2007-10-31 09:36:26
Document Modified: 2007-10-31 09:36:26

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