Necessary Bandwidth Description

0140-EX-ML-2010 Text Documents

ImSAR LLC

2010-11-04ELS_111240

Nov 4, 2010
Form 422 File Number: 0414-EX-PL-2010, modification request

Federal Communications Commission
Office of Engineering and Technology
Experimental Licensing Branch
445 12th St., S.W.
Room 7-A322
Washington, DC 20554

To Whom it May Concern,

On behalf of ImSAR LLC I would like to apply for a modification of Experimental
License Call Sign WE2XVR to further the development radio transmitter geo-location
technology. Active transmitters using a simple QPSK transmission will be required and
passive receivers will be used to perform estimates of transmitter location.

The transmitter will be operated on an occasional basis of a few times per month for
roughly an hour each time it is used. The intended end user of these experimental systems
will be predominantly the US agencies.

We have operated up to this point using experimental license call sign WE2XVR.

I hope the attached document has sufficient information to enable a favorable approval of
an experimental license.

Sincerely,
Adam Robertson
Vice President
1350 N Main Street
Spanish Fork, UT 84660
801-762-7263
adamr@imsar.com

Necessary Bandwidth Description:

The transmitter is QPSK modulated with modulations of 20, 10, 5, 2.5, and 1.25 M baud
Using NTIA Annex J, ‘Guidance for Determination of Necessary Bandwidth’, and the
description of emission ‘Phase Shift Keying’, the bandwidth is calculated as,

B= 2 RK / log2 S

Where,

R= bits per second
K=0.7 to 0.8(typically)
S=signaling states

For the experimental system referred to in the experimental license application,

R = 20, 10, 5, 2, or 1.25 M baud
K=4 for QPSK
K=0.7 (estimated)

Document Created: 2010-11-04 22:23:31
Document Modified: 2010-11-04 22:23:31

© 2024 FCC.report
This site is not affiliated with or endorsed by the FCC