1. Urban Interference
Challenges, Solutions, Futures
dan.deveson@gmail.com
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2. ● DASaster: April 2015 Miami-Dade
Massive Interference
● Distant co-channel
Carrier Desense/alarms
● DFW “wandering” carrier
& broadband intermittent noise
Recent Experiences
dan.deveson@gmail.com
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Presentation

3. Miami-Dade & Broward
Harris & Motorola
Analog & Digital
Many thousands of garbled, missed and dropped calls
over 10+ miles of dense urban core.
A Public Safety Emergency, by any definition.
Diary of a DASaster April 2015
dan.deveson@gmail.com

4. Radio Systems Impacted:
● Miami-Dade County
● City of Miami
● City of Hialeah
● City of Aventura
● Broward County
● State of Florida (SLERS)
Diary of a DASaster NPSTC (item 3)
dan.deveson@gmail.com
http://www.npstc.org/download.jsp?
tableId=37&column=217&id=3403&file
=Examples_Interference_for_Public_
Safety_042515.pdf

5. ● 41 Stories, open balcony hallways
● DAS Antenna each balcony
● 5 concatenated BDA’s throughout
● 425 dB gain, 15 watts composite wideband
power
● Donor antenna pointed in wrong direction(!)
● Oscillation alarms disabled
● No coordination with AHJ at turn up
Potential 7 figure costs to owner.
The Truly Ugly
The Details
https://www.linkedin.
com/pulse/diary-dasaster-das-
gone-wild-dan-deveson

6. Urban Turmoil: DFW
806-809 MHz PS Uplink @ DFW
“Wandering Carrier” over 1 MHz
Causing channel alarms &
Rolling control channels
10 dB “broadband bursts”
(Suspected) raising inbound BER
Possibly affecting digital voting
Cannot see with lower tier service
monitors
Used Anritsu S412E
w. 6 GHz option
“Waterfall” display over 3 minutes

7. What can WE do? 1. Incubate
Physics: It’s not just smart,
It’s the Law
Formed Professional
Wireless Users Group to
seek solutions together.
Hosted Seminars & Invited
Guest Experts to present.
Create Shared Solutions for
Common Problems
http://SoFlaWireless.com/

8. What can WE do? 2. Innovate
17 dB gain & 23 dB isolation
@ 60 MPH…
Gets the job done, if you’re
motivated...
Duct Tape & Anritsu…
For now it’s the State of our Art.
https://www.linkedin.com/pulse/we-call-
retaliator-dan-deveson?trk=mp-reader-card
The Retaliator

9. What can WE do? 3. Legislate
Broward Board of Rule and Appeals In-
Building Subcommittee developed for
Public Safety BDA/DAS
Invited deep industry participation as voting
members
Modified Building Code to require defensible
engineering designs to be required as part
of permitting
http://www.coopergeneral.net/wp-
content/uploads/2016/03/Broward-In-Building-
RF-Code-Mods.pdf
Local Governments can enforce
design & deployment standards
leveraging NFPA-72

10. What can WE do? 4. Anticipate
Detection/Location Solutions
available with multinodal networked
wideband historical heatmaping
Pilot planning, consensus, no $
~$2M could protect South Florida
( <1% of ~$250M of PS RF assets)
Funding Sought:
Bounty?
SuperPAC??
Lottery???
Courtesy CFRS
The alternative is certain DASaster

11. Thank You
Your RF Zen
Dan Deveson
dan.deveson@gmail.com
(305)970-9220
Have Spectrum Analyzer, Will Travel!