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Town Of Los Altos Hills September 23, 1998
Staff Report to the Planning Commission
RE: RENEWAL OF CONDITIONAL USE PERMIT FOR ENHANCED
SPECIALIZED MOBILE RADIO (ESMR) ANTENNA FACILITY;
NEXTEL COMMUNICATIONS; LANDS OF FENWICK; 28011 ELENA
ROAD (#108-94- CUP)
- FROM: Suzanne Davis, Associate Planner
APPROVED BY: Curtis Williams, Planning Direja
RECOMMENDATION That the Planning Commission:
Approve renewal of the conditional use permit, subject to the conditions of approval
outlined in Exhibit"A" (attached), including a five-year term for the use permit.
BACKGROUND
On July 19, 1995, the City Council approved telecommunication facilities for Nextel
Communications to locate antennas and an equipment vault on a 42-acre privately-owned
parcel at 28011 Elena Road (Lands of Fenwick). The antennas and the exposed portion
of the vault (upper two feet) were painted green to blend with the surrounding vegetation,
and are now in place. Condition #5 of the approval (attached) requires that the use
permit be reviewed for renewal after three (3) years. The condition only requires
Planning Commission review.
The subject Nextel Communications facility is the firm's only installation in Los Altos
Hills, but a second installation is proposed at Foothill College (also scheduled on this
Commission agenda), and application for a third may be forthcoming at the CalTrans
maintenance yard site at Page Mill Road and I-280.
DISCUSSION
The current permit allowed the placement of four (4) panel antennas on poles, at a
maximum height of ten (10) feet above the ground level, amidst oak trees and adjacent to
an existing ham radio antenna, to the east of the primary residence and tennis court on the
site.. Two of the antennas are situated to the north of the ham radio antenna, and two are
to the south. The equipment vault is located in close proximity to the driveway below the
house. The applicant proposes to retain the use as it exists, with the exception that the
four panel antennas would be replaced by the same number of"parareflector" antennas
(details attached), which would result in a similar total surface area of the antennas as
exists. The new antennas would be painted the same color as the existing antennas.
Conditions of Current Conditional Use Permit
The applicant has complied with all of the conditions of the current use permit, including
all those related to construction and installation of the facility (see applicant's.application
and letter attached). Condition #7 of the current permit requires monitoring of
radiofrequency (RF) emissions on an annual basis, and the applicant has provided a report
(attached) indicating that the existing emissions comprise only 5.6% of the allowable
emissions under Federal limits. The applicant's RF engineer has recommended that, due
to the very low emissions level, annual monitoring should not be required.
Planning Commission: September 23, 1998
Nextel: Lands of Fenwick
Page 2
Revised Conditions of Approval
Staff has suggested revised conditions (Attachment 1) which eliminate all of the previous
construction-related conditions, which are no longer applicable. The conditions have
also been modified to lengthen the term of the use permit to five (5) years, rather than
three (3), based on the very minimal impact of the facility, and would only require
reporting of RF monitoring at the time of renewal, rather than annually.
Staff has also modified the conditions to be more consistent with the language and
conditions imposed in the several use permits granted since adoption of the wireless
communications policy, including adding a standard condition (#7) requiring an
agreement that the applicant will remove the facilities in the event of abandonment.
Wireless Communications Facilities Policy
The facility was approved prior to the Town's adoption of a wireless communications
facilities policy. The proposed project is generally consistent with the policy, as it is
located to have very little visual impact. It is, however, located on a residential parcel,
which is not encouraged by the Town's adopted policy. In this instance, a lengthy
review process resulted in the approval on this site, rather than on alternative residential
lots, because it is 42 acres in size, allowing for extensive separation from neighboring
residences, and because the antennas could be maintained at a low height given the
elevation of the hill.
Comments from Other Staff
The Fire District and Engineering Department requested no additional conditions.
Site Visits and Photos
The subject site is gated and the antennas and equipment vault are barely perceptible from
off-site. The applicant has provided staff with a set of photographs of the installation,
which are in the file if the Commission is interested. If Commissioners wish to visit the
site to inspect the facilities, they should contact either the owners at 941-9344 or the
applicant's representative, Joe Wyman, at(510) 208-8886,to arrange for a visit.
Staff is available to respond to questions from the Commission or the public.
ATTACHMENTS
1. Exhibit A: Conditions of Approval
2. July 19, 1995 Conditions of Approval
3. Application and Supporting Information
4. Statement of Robert D. Weller, Consulting Engineer
5. Specifications of Antennas
Planning Commission: September 23, 1998
Nextel: Lands of Fenwick
Page 3
ATTACHMENT 1
EXHIBIT "A"
CONDITIONS OF APPROVAL
CONDITIONAL USE PERMIT FOR ENHANCED SPECIALIZED MOBILE
RADIO (ESMR) COMMUNICATIONS FACILITY
NEXTEL COMMUNICATIONS _
_28011 ELENA ROAD (LANDS-OF FENWICK)
#108-94- CUP
1. Any changes or revisions to the telecommunications facility or its use shall
require an amendment to the conditional use permit. Additionally, the Planning
Director may, at any time, schedule a review or revocation hearing before the
Planning Commission regarding the use permit, if any condition of approval is not
being met or the facility is being used inconsistent with the approved use or in
violation of Town development codes.
2. The use permit shall expire five (5) years from the date of approval. Renewal of
the permit must be requested in writing, with appropriate fees, prior to the
expiration date.
3. Paint colors for the antennas shall match the colors of the existing antennas or, if
modified, shall be earth tone colors chosen by the applicant and approved by staff
in conformance with the Town's adopted color board.
4. Subsequent to installation of the new antennas, staff will visit the site and
determine if any additional plantings are needed for screening or erosion control.
Required landscaping, if any, shall be installed prior to final inspection.
5. Monitoring and reporting to the Town may be required at any time, at the
discretion of the Planning Director, and shall be required upon the 5-year review
by the Planning Commission. If, at any time, problems are noted, staff or the
Commission may schedule the report for review along with the Conditional Use
Permit at a public hearing.
6. Maintenance of the equipment, antennas and the grounds, including weed
abatement and maintenance of the facility, shall be accomplished on an on-going
basis. The Town may make random inspections of the property to ensure that the
required maintenance is being accomplished to the satisfaction of the Town of Los
Altos Hills.
7. The applicant shall submit a signed agreement to the Town, agreeing that, should
the use be discontinued by the carrier, all facilities will be removed not later than
ninety (90) days after discontinuance of the use or abandonment. The agreement
shall be drafted by the City Attorney, and must be signed by the applicant and
submitted to the Town prior to installation of the new antennas.
-
po.via_j, i � 1.1/ l�gs .
CONDITIONS OF APPROVAL FOR
CONDITIONAL USE PERMIT; SITE DEVELOPMENT PERMIT AND •
ZONING PERMIT FOR COMMUNICATIONS FACILITY
NEXTEL COMMUNICATIONS (LANDS OF FENWICK) - 28011 ELENA ROAD
File #108-94-ZP-SD-CUP
A. PLANNING DEPARTMENT:
1. Any changes or modifications to the approved plans shall be approved by
the Planning Director or the Planning Commission, depending upon the
scope of the changes.
2. Paint colors for the top of the equipment vault and the panel antennas shall
be earth tone colors chosen by the applicant and approved by staff in
conformance with the Town's adopted color board.
3. Prior to final inspection and release of final building permits a landscape
planting plan must be submitted to and approved by the Site Development
Committee. The landscape plan shall take into consideration adequate
screening of the antennas. All planting required for mitigation screening
that does not establish itself within eight(8) months, shall be replaced. A
$5000.00 landscape deposit shall be posted prior to final inspection.
Required plantings shall be installed within six months. 50% of the
deposit shall be returned one year after the date of the inspection to ensure
adequate establishment and maintenance. The remainder will be released
one year later if the plantings remain viable.
4. Prior to beginning any grading or construction, all significant trees in the
project area are to be fenced at the dripline. The fencing shall be of a
material and structure to clearly delineate the dripline. Town staff must
inspect the fencing and the trees to be fenced prior to commencement of
grading. The fencing must remain throughout the course of construction.
No storage of equipment, vehicles or debris shall be allowed within the
driplines of these trees. Care shall be taken to not divert any water
towards the root crown of any of the Oak trees in the vicinity.
Conditions of Approval
Nextel (Lands of Fenwick)
Page 2
5. This approval will remain in effect for three (3) years. At that time an
application for extension of the use permit shall be re-reviewed by the
Planning Commission for determination of any needed modifications and
for approval to continue the operation of the facility. Monitoring shall
ensure that emissions are safe and remain consistent with safety standards
as they address exposure to the public. -
6. In the event that any of the conditions of this permit are not satisfied, the
Planning Department may cause a noticed public hearing to be sent to
review whether the permit should be continued; and upon a showing of
compelling public necessity demonstrated at the noticed public hearing,
the Town may add, amend, or delete conditions and regulations contained
in this permit.
7. Monitoring and reporting to the Town shall be accomplished at the
installation of the facility and once a year for three years. The reports
shall be forwarded to the Planning Commission for their-information and
review. If problems are noted, staff or the Commission may agendize the
report for review along with the Conditional Use Permit at a public
- hearing.
8. Maintenance of the equipment, antennas and the grounds, including weed
abatement and maintenance of the facility is required to be accomplished
on an on-going basis. The Town shall make random inspections of the
property to ensure that the required maintenance is being accomplished to
the satisfaction of the Town of Los Altos Hills.
B. ENGINEERING DEPARTMENT:
9. The property owner shall inform the Town of any damage and shall repair
any damage caused by the construction of the project to pathways, private
driveways, public and private roadways prior to final inspection and
release of occupancy permits and shall provide the Town with photographs
of the existing conditions of the roadways and pathways prior to
acceptance of plans for building plan check.
10. Any areas on the site that have had the native soil disturbed shall be
protected for erosion control during the rainy season and shall be replanted
prior to final inspection.
Conditions of Approval
Nextel (Lands of Fenwick)
Page 3
11. Any and all changes to the approved grading plan must first be approved
by the Town Engineering Department. No grading shall take place during
the grading moratorium (November 1 to April 1) except with prior
approval from the City Engineer. No grading shall take place within ten
feet of any property line.
12. Upon completion of the construction, a final inspection shall be required
to be set with the Town Planner and the City Engineer two weeks prior to
final building inspection approval.
TOWN OF LOS ALTOS HILLS
26379 Fremont Road• Los Altos Hills,California 94022• (415)941-7222 • FAX(415)941-3160
PLANNING DEPARTMENT
APPLICATION FOR PROJECT REVIEW
1. PROPERTY DESCRIPTION: Please print or type ••
Street Address
7 o rl '.Ro 4I
Lot(s) Number Tract or Parcel Map Number Please Check One: Sewer
Septic
Assessor's Parcel Number (Dross Acreage Net Acreage
I82. CZ• O1(
2. PROJECT DESCRIPTION:
New Residence, etc.
kiteeue-n 3,4044),4 A-Pvt4 TAGILI9
3. PROPERTY OWNER: 1
Name of Legal Owner
Qc ' „I A4rFey b.))c4.
Mai mg Address
Zip
• ►: /1/1 �`�S /At 911x2 Z
Home Phone STA.M Q�^j Work Phone rAX Number
( ) 2a0 ( ) ( )
Representative's Name Phone FAX Number
..3Ce �• NAl' At\ (6b) 10S. 6 SVP (5v) 208. 42?
Mailing Address Zip
rle • 416 141h <=1-. 4 2e' clA<tA4o, c 4. 9 (
4. FEES AND DEPOSITS:
Planner will complete this section. Fees and deposits, payable to the Town of Los Altos Hills, are required to process all
Planning applications.
Fee Deposit
Real Estate Review:
Geologist:
Zoning:
Site Development: Receipt#
SbC)' CO ,f-:)C-C) File# 1 C:e,• ;L}' •CAA.
jai
Date: jai)E.. z S,
5. SIGNATURE OF OWNER(S) OR AGENT:
(Please note: Agent requires letter of authorization from owner)
I, the undersigned owner or authorized agent of the property described above, hereby make an application for the
purposes set forth above in accordance with the provisions of the City Ordinances, and I hereby certify that the
information given is true and correct and to the best of my knowledge and belief.
S►gnatu ie Date
'06
D-.. l /Q/o7 •
•
Town of Los Altos Hills
Conditional Use Permit Renewal Application
28011 Elena Road (File #108-94-ZP-SD-CUP)
Application
1. Nextel is seeking to renew a Conditional Use Permit under Section 10-1.703 from the Planning
Commission and City Council,to extend the approval of an existing"enhanced specialized
mobile radio" facility at 28011 Elena Road for the next 5 years.
2. PROJECT DESCRIPTION
Nextel Communications Inc. of California has been authorized by the Federal Communications
Commission(FCC)to construct and operate the first multi-purpose digital enhanced specialised
mobile radio (ESMR) system in the United States. The services provided are considered a public
utility under the laws of the California Public Utilities Commission.
The fully digital,Nextel ESMR mobile communication system operates in the 806 to 866 Megahertz
frequency band. Although Nextel uses frequencies similar to cellular service providers such as
Cellular One and GTE Mobilnet,the Nextel system and market differ from both the cellular
companies and the new Personal Communication Services (PCS)technology being offered by Pacific
Bell Mobile Services and Sprint PCS.
Nextel's market focus is to provide multiple functions on one hand-held device.The Nextel
communicator can serve as a one-to-one communicator with another person; it can allow one person
to talk to an entire group simultaneously for an impromptu meeting;and it can also serve as a
cellular telephone for private conversations.Consumer goods and service companies such as
construction,passenger shuttle companies,private security companies as well as messenger services
currently use the ESMR system. Nextel Communications also offers service to local police, fire,and
emergency service agencies (such as PG&E,Airporter Shuttle Service,EBMUD) as well as to the
general public.Nextel now serves more than 350 cities across the United States and is currently
offering services in 70 of the top 100 markets. In addition,Nextel International Inc.has wireless
operations and investments in Canada,Mexico,Argentina, Brazil, Indonesia,Philippines,and
Shanghai.
In order to provide clear, consistent communication services and support*the large number of
customers in the surrounding area Nextel proposes to continue to operate an unmanned ESMR
facility at 28011 Elena Road. The proposed facility consists of 4 panel antennas (measuring 4'x 1'x
6")-and a vault equipment shelter (10' X 16'). The antenna arrays face north and south providing
coverage along 1-280 and the neighborhoods of Los Altos Hills.
In accord with the Town's Policy on Wireless Communications Facilities, design efforts were made
to minimize the visual and physical impacts of the proposed facility.The antennas were mounted on
a remote section of a 42 parcel. The equipment shelter was placed below grade. All facilities were
painted a flat green and brown to blend with the existing hillside. All of the facilities are adequeately
screened by existing landscaping and additional landscaping provided as a condition of approval.
Town of Los Altos Hills
Conditional Use Permit Renewal Application
28011 Elena Road (File #108-94-ZP-SD-CUP)
ADDITIONAL INFORMATION
HOW THE CONDITIONS OF APPROVAL HAVE BEEN MET—
1. PAINT COLORS FOR THE TOP OF THE EQUIPMENT VAULT AND THE PANEL
ANTENNAS SHALL BE EARTH TONE COLORS CHOSEN BY THE APPLICANT AND
APPROVED BY STAFF IN CONFORMANCE WITH THE TOWN'S ADOPTED COLOR
BOARD.
All physical improvements on the site have been painted a flat dark green interspersed with a light
tan.Site photos attached.
2. A LANDSCAPE PLAN SHALL BE SUBMITTED TO AND APPROVED BY THE SITE
DEVELOPMENT COMMITTEE. THE LANDSCAPE PLAN SHALL TAKE INTO
CONSIDERATION ADEQUATE SCREENING OF THE ANTENNAS.
Antennas were placed adjacent to existing trees to mitigate views of the facility. In conversation with
Suzanne Davis, it was concluded that Nextel did not prepare a formal landscape plan. However,
during construction of the project,several plants were added to the area around the antenna array,to
the satisfaction of the Planning Department.
3. PERMIT SHALL BE IN EFFECT FOR THREE (3) YEARS. APPLICATION SHALL BE
SUBMITTED TO RENEW PERMIT REQUEST. MONITORING SHALL ENSURE THAT
EMISSIONS ARE SAFE AND REMAIN CONSISTENT WITH SAFETY STANDARDS AS
THEY ADDRESS EXPOSURE TO THE PUBLIC.
We sue making application at this time to renew and extend the CUP. Monitoring of emission has
taken place in each of three (3)year of the permit.A copy of the latest emissions monitoring report is
attached to this application. Note: Hammett and Edison recommend, given the low levels of energy
from the Nextel facility and the consistent readings over the three (3) year period, that further
monitoring not be required. The energy levels associated with the Nextel equipment are only 5.6%
of the applicable public limit.
4. MAINTENANCE OF THE EQUIPMENT, ANTENNAS AND THE GROUNDS,
INCLUDING WEED ABATEMENT AND MAINTENANCE OF THE FACILITY IS
REQUIRED TO BE ACCOMPLISHED ON AN ON-GOING BASIS.
Nextel Technicians and Field engineers have visited the project monthly over the three (3) years of
the permit. All equipment has been maintained in working order over that period. Site photos show
that weed abatement and landscaping have also been maintained.
l
Nextel Communiciarions • Site No. C-665H • 28011 Elena Road, Los Alto.
Report of RF Exposure Measurements
_ Statement of Robert D. Weller, Consulting Engineer
The firm of Hammett & Edison, Inc., Consulting Engineers, has been retained on beha]
SMR (Nextel Communications), a wireless telecommunications carrier, to measure
• frequency electromagnetic fields associated with the transmitting facilities constructec
Elena Road in Los Altos Hills, California (Nextel Site No. C-665H). The undersigned
this statement is a qualified Professional Engineer, holding California Registration No.
which expires on September 30, 1999. This work has been carried out by him or
r r direction, and all statements are true and correct of his own knowledge except, where nc
-data has been supplied by others, which data he believes to be correct.
Prevailing Exposure Standards
The U.S. Congress has required of the Federal Communications Commission ("FCC
= evaluate its actions for possible significant impact on the environment. In Docket 93-62
adopted the exposure limits for field strength and power density recommended in Repo:
"Biological Effects and Exposure Criteria for Radiofrequency Electromagnetic Fields," pu
1986 by the National Council on Radiation Protection and Measurements ("NCRP").
restrictive thresholds for exposures of unlimited duration to_radio frequency ("RF") e
several wireless telecommunications services ("WTS") are as follows:
_ Wireless Telecommunications Service Operating Frequency Occupational Limit Public
Personal Communication ("PCS") 1,900 MHz 5.0 mW/cm2 1.0 m
Cellular Telephone 870 2.9 0.58
Specialized Mobile Radio ("SMR") 850 2.8 0.57
[most restrictive limit] 30-300 1.0 0.20
Measurement Equipment and Methodology
Measurements at 28011 Elena Road were taken by the undersigned engineer on January
The measurement equipment used consisted of a Holaday Industries Model HI-3004 B.
Field Strength Meter with Type HSE Isotropic Electric Field Probe. The survey instrurr
been calibrated by their respective manufacturer on October 29, 1996.
Measurements were taken in accordance with the recommendations of ANSI Standard C9
("Recommended Practice for the Measurement of Potentially Hazardous Electromagnetic
RF and Microwave"). Essentially, the measurement probe was moved about all location
to the antennas, with any locations found to exceed the applicable safety limit being noted.
• HAMMETT&EDISON,INC. 97(
CONSULTING ENGINEERS
SAN FRANCISCO • ;
Nextel Communicarions • Site No. C-665H • 28011 Elena Road, Los Altos Hills.
Report of RF EXposure Measurements
Measurement Results
The maximum ambient RF levels at all accessible locations were measured, with the maximum
power density from the installed transmitting facilities being 0.032 mW/cm2, representing 5.6% of
the applicable public limit.
Areas near the antenna faces were not publicly accessible, as the antennas are located on poles.
and access requires a ladder. The highest RF level at the point of closest approach to the
antennas was about 85% of the applicable occupational limit, occurring above ground at the antenna
faces.
These results are consistent with those reported by Hammett & Edison in 1995 and 1996.
Recommended Mitigation Measures
The antennas are on private property and access to them is possible only by authorized work
crews. Since measured fields in all publicly accessible areas fall below the public limit, warning
signs or other measures are not required to limit access to the antennas.
Conclusion
Based on the information and analysis above, it is the undersigned's professional opinion that the
Nextel radio transmitting facilities located at 28011 Elena Road comply with the prevailing
standards for limiting human exposure to radio frequency energy and, therefore, will not for this
reason cause a significant impact on the environment.
QgoFESSott.
46 9
LLI No. E•12827 u L
•
940'99 Robert D. Weller, P.E.
January 23, 19984ZECIAIGA��\P
SOF CAL\Fo
HEHAMMETT&EDISON,INC. 970527-665H
CONSULTING ENGINEERS
SAN FRANCISCO Page 2 of 2
• National Council on Radiation Protection and Measurements
Report No. 86 (Published 1986)
"Biological Effects and Exposure Criteria
for Radiofrequency Electromagnetic Fields"
Radio Frequency Protection Guide
Frequency - Electromagnetic Fields Contact Currents
Applicable Electric Magnetic - Equivalent Far-Field (mA)
Range Field Strength Field Strength Power Density -
(MHz) (V/m) (A/m) (mW/cm2)
0.3— 1.34 614 614 1.63 1.63 100 100 200
1.34—3.0 614 823.8/f 1.63 2.19/f 100 180/f2 200
3.0—30 1842/f 823.8/f 4.89/f 2.19/f 900/f2 180/f2 200
30—300 61.4 27.5 0.163 0.0729 1.0 0.2 no limit
300— 1,500 3.54ff 1.59if /17106 ff1238 f/300 f/1500 no limit
1,500— 100,000 137 61.4 0.364 0.163 5.0 1.0 no limit
Note:f is frequency of emission,in MHz.
Occupational Exposure
Public Exposure ———
1000 —
Power 100 —
Density 10 — \\
(mW/cm2) /
0.1 —
Contact 1000 —
Current
(mA) 100 — — -
I I I I I I
0.1 1 10 100 103 104 105
Frequency(MHz)
HEHAMMETT&EDISON,INC. NCRP-86 Standard
CONSULTING ENGINEERS
SAN FRANCISCO Figure 1
• RFR.GROUNDTM Calculation Methodology
Determination by Computer
of Compliance with Human Exposure Limitations
The U.S. Congress has required of the FCC that it evaluate its actions for possible
significant impact on the environment. In Docket 79-144, the FCC adopted the radio frequency
protection guide of the American National Standards Institute Standard C95.1-1982, "Safety
Levels with Respect to Human Exposure to Radio Frequency Electromagnetic Fields, 300 kHz to
100 GHz." Exposures are to be averaged over a six-minute period. In 1992, ANSI published a
revised standard, C95.1-1992, which defined "controlled" and-"uncontrolled" environments,
setting for the latter limits generally five times more restrictive. The C95.1-1992 controlled (i.e.,
occupational) limits are approximately the same as in C95.1-1982. In Docket 93-62, the FCC
adopted the exposure limits for field strength and power density recommended in Report No. 86,
"Biological Effects and Exposure Criteria for Radiofrequency Electromagnetic Fields," published in
1986 by the National Council on Radiation Protection and Measurements. This standard is very
similar to C95.1-1992, and the effective date for applying it to all FCC licensees is October 15,
1997.
The FCC Office of Engineering and Technology Bulletin No. 65 (August 1997) gives the
formula for calculating power density from an individual radiation source:
2.56 x 1.64 x 100 x RFF2 x [0.4xVERP + AERP] mw/cm2
power density S = 4702 , in ,
where VERP = total peak visual ERP (all polarizations), in kilowatts,
AERP = total aural ERP (all polarizations), in kilowatts,
RFF = relative field factor at the direction to the actual point of calculation, and
D = distance from the center of radiation to the point of calculation, in meters.
The factor of 2.56 accounts for the increase in power density due to ground reflection, assuming a
reflection coefficient of 1.6 (1.6 x 1.6 = 2.56). The factor of 1.64 is the gain of a half-wave dipole
relative to an isotropic radiator. The factor of 0.4 converts NTSC peak visual ERP to an average
RMS value; for FM, cellular, and PCS stations, of course, the value of VERP is zero. The factor of
100 in the numerator converts to the desired units of power density.
This formula has been built into a computer program by Hammett & Edison that calculates,
at each location on an arbitrary rectangular grid, the total expected power density from any number
of individual radiation sources. The program also allows for the description of the actual terrain at
the site to obtain more accurate projections. The calculated results can be shown on a plat of the
calculation grid as a percentage of the appropriate limit. Generally, a solid black dot appearing on
the plat indicates an RF field calculated to be in excess of 1% of the appropriate limit. The dots
increase in size proportionally with the magnitude of the calculated field up to 100% of the
appropriate limit. At calculated fields above 100% of the limit, the dots become open circles, again
increasing in size proportionally with the magnitude of the calculated field.
HEHAMMETT&EDISON,INC. Methodology
CONSULTING ENGINEERS •
SAN FRANCISCO Figure 2
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.. Nextel Communications 1((JJ��,ir�
475 14th Street, Suite 200, Oakland, CA 946TZ49tb'
i. 510 645-1400 FAX 510 645-1419 ��C.:. "'"
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' August 6, 1998 _F _ -
Suzanne Davis
•, Town of Los Altos Hills .
s
26379 Fremont Road
Los Altos Hills,CA 94022
i.
RE:Use Permit renewal,28011 Elena Road
FILE # 108 94-ZP-SD-CUP
Dear Suzanne:
t
,, As I mentioned in my voice mail, the'Radio Frequency Engineers for 28011 Elena Road site would like to
change out the existing antennas on the site: I am enclosing cut sheets on the new antennas.
The.southern array will be changed from two (2) panel antennas (measuring 1' X 4' X 6") to two (2)
paraflector antennas(measuring 3'X 5'6"X 1'6").The paaflector antennas are made up individual steel or
aluminum rods vs. a solid covering of the panel antenna The riew antenna can focus its energy in a more
concentrated manner, reaching longer distances along I-280 and decreasing potential interference with
k
nearby Nextel facilities.T.he,new antennas will be painted to match the existing structural frame arid blend
4 with the landscape.
The northern array will be changed from two (2) panel antennas (measurruig 1'X 4'X 6") to two (2) T7.
degree panel,antennas (measuring 1'2" X 3'2.5" X 4.5"). This antenna is lighter than the original panel
antenna,decreasing loading on the pole mounts. The new antennas will be painted to match the existing
structural frame and blend with the landscape.
The change in antenna will not increase the land use intensity on the site.In fact,the change in antenna area
is minimal and should not increase the visibility of the site.
,y
u Please let me know if these changes can be included in.the permit extension scheduled for late August,or if
Curtis can.approve the change administratively. Thank you for your help in this matter.
Siicereiy,
,r.„ �4 ,;
`
` ` rl
' Joe R.Wyman,AICP
Zoning Manager
1
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trunking control.
:I • Compact packaging for quick and economical shipment via UPS or
Federal Express. (Shown vertically polarized)
Specifications:
u-� Frequency range 806-896 MHz(broadband)
Gain 17 dBd - 016%i Impedance 50 ohms °O
r i VSWR < 1.5:1
Polarization Horizontal or vertical kar290
Front-to-back ratio >25 dBS ,i.,:„Maxmum input power 100 watts .
r.
so.
beamwidth 12 degrees(half-power)
:.°6� 0.
- E-plane beamwidth 24 degrees(half-power) r ;
Termination N female 6 I.0
°,
r, ti
Weight 38 lb(17.2 kg) °•
.. Dimensions 68 x 36 x 18 inches (1727 x 914 x 457 mm) H-plane
Equivalent flat plate area 4.4 ft°(.41 m2) Horizontal pattern-V-polarization
16,1Vertical pattern-H-polarization
Wind survival rating 100 mph(160 kph)
Shipping dimensions 40 x 36 x 7 inches (1016 x 914 x 178 mm) .1 °° _ a
Shipping weight 47 lb(21.3 kg) ®
Mounting - Mounting kits available for masts of 2.375 to °° 6;
4.5 inches(60 to 114 mm)OD.
- �. See reverse for order information. ,
,_ 1 ii. i
/ o
200 /lb, ?C.
A
O 61%.
Y X90•
E-plane
SCALA ELECTRONIC CORPORATION Horizontal pattern-H-polarization
_ Post Office Box 4580 Phone: (541) 779-6500 Vertical pattern-V-polarization
Medford, OR 97501 (USA) Fax: (541) 779-3991
•- http://www.scala.net
PARAFLECTOR is a registered trademark of Scala Electronic Corporation.
Scala Electronic Corporation is a member of the Kathrein Group J
10054-D
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' PR-�50
SCALA PARAFLECTOW ANTENNA
17 dBd gain
806-896 MHz (broadband)
68 inchesy►
(1727 mm)
A
el
•, 18 inches
(457 mm)
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MKPX-8 Mounting Kit ' ,F�
I i j - - 36 inches-
(914 mm)Mounting Options: Stock Code
Model Description
MKPX-8 Mounting Kit for 2.375 inch 97150-002
(shown) (60 mm)OD mast.
MKPX-9 Mounting Kit for 2.875 inch 97140-052
(73 mm)OD mast. •-
MKPX-10 Mounting Kit for 3.5 inch 97140-053
(89 mm)OD mast. _
MKPX-11 Mounting Kit for 4 inch 97140-054
(102 mm)OD mast.
MKPX-12 Mounting Kit for 4.5 inch 97140-055
(114 mm)OD mast.
MKTB-1 Tilt Mount Kit,8-39 degrees tilt angle. 97415-001
Used with any MKPX kit listed above
Order Information: Stock Code
Model
PR-850 (mounting kit not included) 94051-001
Note: Requires mounting kit at additional cost(see listing above).
Replacement feed assembly(806-896 MHz) 94351-001
SCALA ELECTRONIC CORPORATION
Post Office Box 4580 Phone: (541)Fax: (541) 779-39910
Medford, OR 97501 (USA)
http://www.scala.net J
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