antena mounting others

8/10/2019 Antena Mounting Others

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Company Confidential

Mobile Radio Networks

General guidelines for antennas and

cables

GSM 900/1800

Release: 1Filename: 253!3"doc

#artici$ants: %odil &rring' Siemens (or)a*

Siemens General guidelines for antennas and cables Released

Radio Communication Systems Project: GSM900/1800 By: Bodil ErringSignature: BE

ut!or: Bodil Erring "ate:##$%&$'(

Sign: BE "ocument Number:)*+&&(&+&$doc

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Mobile Radio NetworksGeneral guidelines for antennas and cables

+able of content

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3" M(. ,(+&((,S' M(+.(G G.&-.(&S /Error0Marcador no definido$

3.1 Separation between antennas ¡Error!Marcador no definido.

3.1.1 Vertical spacing ¡Error!Marcador no definido.

3.1.2 Horisontal spacing ¡Error!Marcador no definido.

3.1.3 Combined vertical and horisontal separation ¡Error!Marcador no definido.

3.2 Mounting on roof top ¡Error!Marcador no definido.

3.3 Diversity, antenna mounting ¡Error!Marcador no definido.

" .R&+.(,- ,(+&((,S' M(+.(G G.&-.(&S/Error0Marcador no definido$

.1 Separation between antennas ¡Error!Marcador no definido.

4.1.1 Vertical spacing ¡Error!Marcador no definido.

4.1.2 Horisontal spacing ¡Error!Marcador no definido.

4.1.3 Combined vertical and horisontal separation ¡Error!Marcador no definido.

.2 Mounting on roof top ¡Error!Marcador no definido.

.3 ntennas mounted on wa"" ¡Error!Marcador no definido.

. ntenna a"ignment ¡Error!Marcador no definido.

.# Diversity, antenna mounting ¡Error!Marcador no definido.

.$ ntennas mounted in mast%tower ¡Error!Marcador no definido.

5" ,- #-,R.S& ,(+&((,S ,( SM,R+ ,(+&((,S /Error0Marcador nodefinido$

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ut!or:%odil &rring' Siemens (or)a*

"ocument number:253!3"doc

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0" General

1!e mounting of antennas is one of t!e most important items w!en implementing a cellular

system$ 1!e antennas are t!e front point of t!e system2 and t!e actual mounting will to a certaindegree decide t!e co3erage and t!e total 4uality of t!e system$ 1!is document describes many oft!e important factors for t!e antenna mounting2 including e5amples and drawings$

1!e actual placement of t!e antennas on t!e different sites s!ould be decided t!roug! a 4ointSite Sur6e*7 process w!ere t!e responsible radio planner and t!e responsible for t!e Ci3il 6orksmakes t!e decision on w!ere and !ow to mount t!e antennas on eac! site$

"ifferent guidelines and descriptions are pro3ided regarding necessary isolation betweenantennas2 di3ersity2 distance between antennas2 different types of mounting etc$ 1!ese guideliness!ould be useful for t!e C6 engineers and t!e installers out on t!e site$

1!ere are a number of re4uirements t!at must be considered for e3ery installation$

• di3ersity or no di3ersity

• #2) or + antennas to be used for eac! sector

• a3ailable space for t!e antennas

• necessary space between antennas

• close7in obstructions t!at can disturb or destroy t!e antenna pattern

1!e different items as listed abo3e are described in t!is document$8n eac! case and for eac! specific site2 an indi3idual e3aluation must be made2 bot! by t!eresponsible radio planner and t!e ci3il works e5pert$

Most of t!e calculations in t!is report is made for 9SM'%%$ or 9SM#,%% smaller distancesbetween antennas etc$ can be considered$

8n c!apter ; some guidelines are made for t!e use of different types of feeder cables$ 1!ecalculations are made bot! for 9SM'%% and for 9SM#,%%$

1" ,ntenna .solation

1!e isolation between two antennas is defined as t!e attenuation from t!e connector on oneantenna to t!e connector of t!e ot!er antenna w!en t!e antennas are in t!eir installation positions$

1!e isolation between s!ould be minimum &% dB between one recei3e -R5. and one transmit -15.antenna2 and minimum )% dB between two transmit antennas$ <sing t!ese isolation figures2unwanted signals into t!e recei3er can be a3oided$

1o obtain t!e minimum re4uired isolation between antennas2 t!e isolation must be transformed to acertain minimum distance between t!e antennas$ "ifferent spacing is necessary for 3ertical and!orisontal spacing$ 1!e distance depends also on t!e antenna types and t!e configuration$"ifferent test7measurements !as been carried out to find t!e isolation between different antennasand in different networks$=mni7antennas: needs larger spacing !orisontally due to no limits in t!e antenna diagramcompared to directional antennas$

>ertical?!orisontal: or 3ertical separation2 less distance is re4uired t!an for !orisontal separation$

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2" General notes regarding installation

8n t!is c!apter a number of different tasks related to t!e mounting of t!e antennas are described$

=nly some general description are gi3en regarding t!e following important subjects:

7 tilt brackets7 close7in obstructions7 3ertical?!orisontal mounting7 large antennas?small antennas7 precise mounting

+ilt bracets: 8n urban and suburban areas t!ere will always be a need for c!anges and for restricting t!esignals?co3erage due to t!e use of too !ig! buildings and t!e demand for en!anced capacity$"uring an optimising period different p!ysical c!anges needs to be performed2 i$e$ to t!e tilt and

orientation of t!e different antennas$ <sing tilt7brackets on all sectors from t!e start of t!einstallation will ease t!e installation work during t!e optimising period$

Close in obstructions: 1!e radiation pat! of t!e antenna will be distorted if t!ere are obstacles or reflecting surfaces in t!esurroundings2 especially close to t!e antenna$ Normally t!e antenna pattern distortion is ofpractical importance only in t!e main lobe$ s a general rule2 t!e w!ole angle of t!e main lobe s!allbe kept free from obstacles and reflecting surfaces nearby t!e antenna$ Close to t!e antenna

means anyt!ing obstructing t!e antenna pat! -+;%° for omni2 specified sectors for directional

antennas. p!ysically wit!in #%7)%m in front of t!e antenna$ =bstructions can be guided lines or anyot!er antenna in towers2 any part of t!e tower2 any part of a building2 any wall or articles around t!esame !eig!t on any neig!bour buildings etc$

Horisontal spacing of antennas: -see figures later in t!e report. !orisontal spacing of t!e antennas for one sector is t!e optimumway of mounting t!e antennas$ Bot! t!e transmit and t!e recei3e antenna-s. will be at t!e same!eig!t abo3e ground2 and t!e recei3e and t!e transmit co3erage areas will be identical$ 1!eantennas needs to be mounted in t!e same plane and wit! t!e same alignment and tilt -see figurelater in t!e report.$

Vertical spacing of antennas: >ertical spacing of antennas s!ould be used if !orisontal spacing could not be ac!ie3ed$ <sing3ertical spacing2 t!e recei3e antenna s!ould be mounted on top$

,ntenna sie: 1!e antennas used for 9SM'%% or #,%% are made in a number of different si@es$ Mainly t!ere aretwo main groups2 omni7directional -no restriction in co3erage area around t!e antenna. anddirectional -restricted co3erage to a specified sector.$ 1!e si@e of t!e antenna can 3ary from +%7*%cm up to )$* m for directional to + m for omni antennas2 depending on t!e gain of t!e antenna$ 8nt!e 9SM'%% system2 it is 4uit common to use !ig! gain directional antennas wit! a lengt! around#$* 7 ) m -gain around #*7#, dBi.$ or 9SM#,%%2 t!e antennas will normally be s!orter due to t!e!ig!er fre4uency2 an antennas wit! an antenna of #, dBi gain will !a3e t!e lengt! of #$+m $

Precise mounting: 6!en t!e installation is made2 it is of 3ital importance to make a precise mounting$ ll poles s!ould

be mounted 3ertically2 not #° or )° out of t!e 3ertical position$ ll antennas in one sector s!ould

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!a3e e5act t!e same alignment and tilt2 and s!ould be mounted in t!e same plane$ -see figureslater in t!e report.$ 1!e antennas s!ould not be mounted be!ind eac! ot!er$Please note t!at w!en large antennas are used2 t!e 3ertical beamwidt! will be 3ery small$ 1!isimplies t!at t!e co3erage area for t!e antenna will be 3ery sensiti3e to different inconsistency in t!e

mounting$ =nly one or two degrees out of 3ertical position for one of t!e antennas in a sector canresult in une4ual antenna patterns for t!e antennas in t!is sector$

Co-location with other operators:8n towers2 on buildings etc$ it is possible to co7locate antennas for different operators$ 8t is !owe3erimportant to a3oid any obstruction between antennas for t!e different operators$ 3erticalseparation is easy to ac!ie3e in towers$ =n buildings also !orisontal separation can be used2preferable wit! antennas in t!e same line$Co7location of antennas for different operators are common in many different countries$

3" mni antennas' mounting guidelines

3.1 Separation between antennas

3.1.1 Vertical spacing

8n t!e figure below an e5ample on installation using 3ertical spacing between antennas are gi3enfor omni antennas$ 1!e minimum spacing between t!e R5 and 15 antenna to ac!ie3e t!e re4uiredantenna isolation is gi3en by t!e formula below$ 8f antennas are mounted on a mast -not in t!e top.or direct on to a wall side of a building2 special care s!ould be taken regarding t!e spacing out to

t!e antenna$ s t!e antenna diagram for an omni7antenna co3ers +;%°2 a s!ort distance to t!e wall

etc$ will c!ange t!e antenna pattern dramatically$

k

a

:ertical s$acing

R;

+;

aA minimum distance to pole or wallkA %$*m minimum

1!e 3ertical isolation can be calculated using t!e following formula:"ate:11"0"199!



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8solation -. ≈ ), &% log -k?λ. dB general

8solation -. ≈ &( &% log -k. dB '%% M@

k A distance -m. between antennas as seen in t!e figure

1o a3oid influence from t!e tower structure2 t!e distance DaD s!ould be minimum #m for omni7antennas$

3.1.2 Horisontal spacing

1!e !orisontal distance between a 15 and a R5 antenna or between two 15 antennas is dependenton t!e gain of t!e antennas$ 1o ac!ie3e t!e re4uired isolation between two !orisontally spacedantennas2 t!e distance will be considerably !ig!er compared to 3ertical separation$ 1!e reason ist!at t!e antennas are in t!e main radiation fields$

1!e following formula can be used to calculate t!e isolation depending on t!e !orisontal distancebetween t!e antennas:

8solation -. ≈ )) )% log -d?λ. 7 -9# 9). dB general formula

8solation -. ≈ +# )% log -d. 7 -9# 9). dB '%% M@

9#A gain of antenna #2 dB9)A gain of antenna )2 dBdA !orisontal distance in meter

d

<orisontal s$acing

R; +;

dA minimum distance between omni antennas

1!e different distances are gi3en in t!e table below2 for t!e different antenna gain$

+able: Re=uired >orisontal distance' d' for omni?antennas

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Gain @d%dA +; ? R; @0 d%A +; ? +; @20 d%A

% +$% m #$%

+ *$* m #$%; ## m #$%

' )) m )$*

#% ), m +$%

3.1.3 Combined vertical and horisontal separation

1!e same re4uirements applies to t!is type of installation regarding isolation between t!eantennas$ Minimum )% dB between two 15 antennas and minimum &% dB between one R5antenna and one 15 antenna$ s for t!e 3ertical separation2 a minimum of %$*m is re4uiredbetween t!e antennas$ or t!e !orisontal distance t!ere is no limitations as long as t!e 3ertical

distance is minimum %$*m$

1!e resulting isolation can be calculated using t!e formula below if t!e 3ertical and !orisontalisolation is calculated as in +$#$# and +$#$)$

8solation -. ≈ -3 7 !. aB?'%F !

3 A >ertical isolation ! A orisontal isolationaF A ngle between antennas

2ombined >orisontal and 6ertical s$acing

k

a

d

dA only practical limitation for ma5imum distancekA %$*m minimum

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3.2 Mounting on roof top

Bot! for omni antennas and for directional antennas certain precautions s!ould be taken w!en

mounting antennas on roof top$ 1!e figure below s!ows t!e re4uired free space and distances t!atare needed$

>

d1

Mounting on roof?to$' omni antenna

d2

dA distance from antenna to edge of roof !A necessary !eig!t abo3e roof7top

8t is necessary to take t!e first re@nel @one into account w!en d and ! are defined$ Please notet!at for large distances t!e close7in co3erage area of t!e sector may be affected$ mounting closeto t!e edge of t!e roof will be t!e preferred option$ 1!e following table gi3es t!e outline for t!edifferent combination of d and !$

d @mA > @mA

%7# %$*#7#% )

#%7+% +

G+% +$*

3.3 i!ersit"# antenna mounting

1o obtain t!e di3ersity gain2 t!e two R57antennas !a3e to be mounted wit! a certain separation$1!e effecti3e antenna !eig!t abo3e ground le3el must also be considered$

1!e relation between t!e di3ersity distance and t!e antenna !eig!ts gi3en by: a G ?#%

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A effecti3e antenna !eig!t abo3e ground le3elaA distance between R5 antennas

1!e two recei3e antennas s!ould be mounted at t!e same !eig!t abo3e ground -for !orisontally

spaced antennas.$

Minimum distance between R5 and R57di3ersity: &mRecommended dist$ between R5 and R57di3er$: ;m

longer distance gi3es a !ig!er di3ersity gain2 but may be difficult to implement$

R;/+;

R;d

d2

erticall* and >orisontall* s$aced omni?antennas )it> di6ersit*

k#

R;/+; R;d

d)A & 7; m for 9SM'%% k#A +m minimum for 9SM'%%2 )7+m min$ for 9SM#,%%

" irectional antennas' mounting guidelines

$.1 Separation between antennas

4.1.1 Vertical spacing

1!e &% dB 157R5 isolation will be ac!ie3ed if t!e 3ertical distance between two antennas on t!esame 3ertical line is %$* m or more$ 1!is applies to all types of directional antennas$ 1!e )% dB 15 715 isolation will be ac!ie3ed for less distance2 but normally %$*m is a practical minimum distance$1!e distance is measured between radiating parts of t!e antennas$

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a

:ertical s$acing

R;

+;

aA%$*m minimum

or !orisontal isolation t!e re4uirements are e4ual in terms of dB$ 1!e distance between antennasare depending on t!e !orisontal beam of t!e antenna for directional antennas$ 1!e table belows!ows t!e different 3alues for t!e different types of antennas$

1!e 3ertical isolation can be calculated using t!e following formula:

8solation -. ≈ ), &% log -a?λ. dB general

8solation -. ≈ &( &% log -a. dB '%% M@

a A distance -m. between antennas as seen in t!e figure

4.1.2 Horisontal spacing

1o ac!ie3e t!e re4uired )% dB -15 7 15. or &% dB -R5 7 15. for !orisontal separation2 t!e distance isdifferent for t!e different antenna types$ 1!e distance is 3ery muc! dependent on t!e gain in t!e'%F direction based on t!e !orisontal beam widt! of t!e antenna$ 1!is means t!at antennas wit!broader beam -!orisontally. re4uires more distance due to t!e larger power in t!e '%F direction$1!e broader beam2 t!e larger distance is necessary$ 1!e table below is also 3alid for t!econfiguration as gi3en in t!e figure to t!e rig!t$

1!e !orisontal isolation can be calculated using t!e following formula if t!e distance is known:

8solation -.! ≈ +# )% log -k. 7 -9# 9). dB for '%% M@

k A distance -m. between antennas as seen in t!e figure abo3e9#A gain of antenna # in dBd2 in direction to antenna )9)A gain of antenna ) in dBd2 in direction to antenna #

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k

<orisontal s$acing

R; +;

ma5 #* F

,ntennas mounted in different $lanes

a

aA

'%B

main beamdirection

+able: <orisontal se$aration bet)een antennas' GSM900

%eam?)idt>3 d% @degreesA

Gain @d%dA istance @mA+; ? R;

istance+; ? +;

;% 7 (% ( 7 , %$* %$*

;% 7 (% #% 7 ## %$, %$*

;% 7 (% #+ 7 #& #$* %$*

;% 7 (% #; 7 #( +$% %$*

(* 7 ,* ; 7 ( %$' %$*

(* 7 ,* ' 7 #% #$, %$*

(* 7 ,* #) 7 #+ +$; %$*

(* 7 ,* #* 7 #; ($) %$(

'* 7 #%* * 7 ; )$& %$*

'* 7 #%* , 7' )$; %$*

'* 7 #%* ## 7 #) *$) %$*

'* 7 #%* #& 7 #* #%$& #$%

##* 7 #+% & 7 * #$, %$*

##* 7 #+% ( 7 , +$; %$*

##* 7 #+% #% 7## ($) %$(

##* 7 #+% #+ 7 #& #&$& #$*

#,% #+ )*$% )$*

4.1.3 Combined vertical and horisontal separation

1!e same re4uirements applies to t!is type of installation regarding isolation between t!eantennas$ Minimum )% dB between two 15 antennas and minimum &% dB between one R5antenna and one 15 antenna$ s for t!e 3ertical separation2 a minimum of %$*m is re4uiredbetween t!e antennas$ or t!e !orisontal distance t!ere is no limitations as long as t!e 3erticaldistance is minimum %$*m$ 1!e resulting isolation can be calculated using t!e formula below$

8solation -. ≈ -3 7 !. aB?'%F !

3 A >ertical isolation

! A orisontal isolationaF A ngle between antennas

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ombined >orisontal and 6ertical s$acing

k

a

d


$.2 Mounting on roof top

8n city areas t!e most common mounting of antennas will be on roof7top or on t!e walls of t!ebuildings$ 8t is of 3ital importance to make a joint site sur3ey on e3ery site t!at s!ould be used2 andt!at t!e radio planner and t!e ci3il works responsible agree mutually on t!e antenna placements$"irectional antennas are used at almost #%%H of t!e sites wit!in a city$ 1!e different alternati3esfor mounting is antennas mounted on poles somew!ere on t!e roof7top2 antennas mounted in asmall mast on t!e roof7top or antennas mounted directly to t!e wallside$

Close7in obstructions must always be a3oided$

>

d

Mounting on roof?to$

dA distance from antenna to edge of roof2 !A necessary !eig!t abo3e roof7top

8t is necessary to take t!e first re@nel @one into account w!en d and ! are defined$ Please notet!at for large distances t!e close7in co3erage area of t!e sector may be affected$ mounting close

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to t!e edge of t!e roof will be t!e preferred option$ 1!e following table gi3es t!e outline for t!edifferent combination of d and !$

d @mA > @mA

%7# %$*

#7#% )

#%7+% +

G+% +$*

$.3 %ntennas mounte& on wall

or antennas mounted directly on t!e wall2 t!e same principles regarding mounting in t!e sameplane etc$ s!ould be followed$ 1!e antenna diagram will not be ideal compared to a free mountingon t!e roof top etc$ owe3er2 wall7mounted antennas will restrict t!e backlobe2 impro3e t!e totalinterference performance of t!e network and impro3e t!e total possibility to implement !ig!capacity networks$ 1!e minimum distance between t!e wall and t!e antenna s!ould be one wa3e7lengt!$

$.$ %ntenna alignment

ll antennas for one sector s!ould !a3e t!e same alignment and tilt$ 8f t!ere is a differencebetween t!e alignment or tilt for t!e recei3e and transmit antenna2 a difference in t!e co3erageareas will be t!e result2 and imbalance in t!e network may cause dropped calls etc$ 1!e antennass!ould also as far as possible be mounted in t!e same plan$ 1!e figures below s!ows t!ema5imum angle between antennas mounted in different planes2 and t!e alignment for antennas int!e same sector$

ma5 #* F

,ntennas mounted in different $lanes

a

aA

d d

,lignment of antennas

R5?15 R5d-R5?15.

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1!e alignment d as s!own in t!e figure must be e4ual for all antennas in one sector2 bot! for t!euse of ) and + antennas in t!e sector -if + antennas are re4uired.$ 1!e same re4uirement appliesto t!e tilt$ 1!e same tilt 3alue must be mounted at all antennas in one sector$

$.' i!ersit"# antenna mounting

or di3ersity ) or + antennas could be used for eac! sector$ 8f ) antennas are used2 one of t!eantennas will be a combined R5 and 15 antenna$ 1!e second antenna will be t!e R57di3ersityantenna$

s for t!e omni7antennas2 to ac!ie3e as !ig! as possible di3ersity gain2 t!e two R57antennas mustbe mounted wit! a certain distance between$ 1o find t!is distance2 t!e antenna !eig!t abo3eground le3el s!ould also be considered$

1!e relation between t!e di3ersity distance and t!e antenna !eig!ts gi3en by:

a G ?#%

A effecti3e antenna !eig!t abo3e ground le3elaA distance between R5 antennas

1!e two recei3e antennas s!ould be mounted at t!e same !eig!t abo3e ground -for !orisontallyspaced antennas.$

Minimum distance between R5 and R57di3ersity2 9SM'%%: &mRecommended dist$ between R5 and R57di3er$2 9SM'%%: ;m

longer distance gi3es a !ig!er di3ersity gain2 but may be difficult to implement$

+;/R;

R;d

d1

erticall* and >orisontall* s$aced antennas )it> di6ersit*

k#

+;/R; R;d@+;/R;A

@+;/R;A

d#A & 7 ;m for 9SM'%% k#A +m minimum for 9SM#,%%

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ombined >orisontal and 6ertical s$acing

k

a

d

R;/+;

R;d


$.( %ntennas mounte& in mast)tower

or antennas mounted in towers or masts it is often difficult to ac!ie3e t!e optimum distancebetween antennas w!en di3ersity is used$ Iarge distance between t!e antennas w!en !orisontalspacing is used will force large constructions in t!e top of t!e mast$ Practical aspects regarding t!econstruction will t!erefore limit t!e distance between t!e antennas$ 1!e numbers and constructionform as gi3en below !as been used in se3eral projects$ 1!e figures s!ow a typical constructionform for a +7sector site2 based on a triangular in t!e top of t!e mast2 and a simpler construction for

a )7sector site for #,%° separation between t!e sectors$

3?sector site' triangular construction in mast?to$

+;/R;

R;d

R;d

+;/R;

+;/R;R;dd#

@+;/R;A

@+;/R;A

@+;/R;A

d#A &m minimum for optimum di3ersity effect -9SM'%%.

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+o)er

+)o sector site' 180B sector se$aration

+;/R;

R;d

R;d

+;/R;

1

@+;/R;A

@+;/R;A

k#A &m minimum for optimum di3ersity effect -9SM'%%.2 )$*7+m can be used

or 9SM#,%% smaller distances can be used$

5" ual #olarised antennas and Smart antennas

"ual polarised antennas:1!ere are two different types of dual polarised antennas2 3ertical?!orisontal and t!e cross7polarised

antenna$ "ifferent tests !as been made and are still in t!e process to be made by Siemens 9 in9ermany to 3erify t!e benefits by using t!is kind of antennas$ 8t s!ould be possible to get !old oft!e test by contacting Siemens in Munic!$"ual polarised antennas are also tested by se3eral operators2 and are already in use in somecountries$

Smart antennas:"ifferent articles are describing t!e use of smart antennas$ 8f smart antennas s!ould beimplemented in t!e network2 all possible benefits and any possible negati3e items s!ould be clearlystated before any smart antennas are implemented$

" Feeder ables

1!e lengt! of t!e feeder cable is important for t!e total system$ <se of feeder cables implies a lossto t!e system$ 1!e longer necessary feeder cable2 t!e larger dimension of t!e cable2 and !ence amore e5pensi3e cable$

1!e total loss of t!e feeder cable2 jumper cable and connectors s!ould be specified in t!e link7budget$ reasonable loss 3alue to use in t!e link7budget would be + dB bot! for 9SM'%% and9SM#,%%$ or 9SM#,%% t!is will imply larger dimension of t!e cable due to t!e !ig!er loss 3aluesin t!e cable for !ig!er fre4uencies$

General guidelines for feeder cable length:

s a general rule2 t!e total lengt!s of t!e cables using e4ual cable types will be appro5imately:"ate:11"0"199!



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GSM1800 !5C of GSM900

For the values in the tables below, a total loss of 3 dB for feeder cable, jumper cable andconnectors is assumed for the calculation of the different feeder lengths. The different cable

lengths/types are calculated both for GSM900 and for GSM1800.

Table, GSM1800: Cable Loss main feeders/jumpers (1700 MHz)

Feeder Type Feeder Loss

(dB/m)

Max. Feeder length in (m)

(max. 2,567 dB main feeder

loss)

Superflexible Fsj4-

50b - 50ohm

Jumper from the

equipment to the EMP

0.159 1.75 m (Fixed cable)

Ldf4-50a - 50 ohm 1/2" 0.1030 26.4 m

Ldf5-50a - 50 ohm 7/8" 0.0587 43.7 m

Ldf6-50a - 50 ohm 1 1/4" 0.0431 59.6 m

Ldf7-50a - 50 ohm 1 5/8" 0.0372 69.0 m

Ldf4-50a - 50 ohm Jumper to the

antenna


The feeder loss (dB/m) in the table is always related to 1700 MHz in the Andrew catalogue.

Table, GSM900: Cable Loss main feeders/jumpers (960 MHz)

Feeder Type Feeder Loss

(dB/m)

Max. Feeder length in (m)

(max. 2,686 dB main feeder

loss)

Superflexible Fsj4-

50b - 50ohm

Jumper from the

equipment to the EMP


Ldf4-50a - 50 ohm. 1/2" 0.07510 35.8 m

Ldf5-50a - 50 ohm. 7/8" 0.042 63.9 m

Ldf6-50a - 50 ohm. 1 1/4" 0.031 86.6 mLdf7-50a - 50 ohm. 1 5/8" 0.0262 102.5 m

Ldf4-50a - 50 ohm Jumper to the

antenna

0.07510 1,50 m (Fixed cable)

The feeder loss (dB/m) in the table is always related to 960 MHz in the Andrew catalogue.

In all calculations in the table it is assumed that the connectors have a loss which is close

to zero. To adjust for any connector loss, a safety margin of a few meters could be used in

each case.

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Bot! for 9SM'%% and for 9SM#,%% t!e total loss s!ould be kept wit!in + dB for cables?jumpersand connectors as far as possible$ t some sites it mig!t be difficult to construct t!e site wit! t!ere4uired type of cable due to limited space in t!e cable runways etc$ 8n t!ese cases it is importantt!at t!e Ci3il 6ork engineer and t!e Radio Planner discuss alternati3es for t!e solutions$ 1!e most

important part is t!at t!e loss is kept wit!in reasonable 3alues2 and t!at t!e Radio Planner knowst!e e5act loss in t!e system$

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