VSWR related

[kenshinz]

hi all,

could someone give the explanation about vswr effect in drive test measurement?

[justdream]

VSWR problems will give you bad quality, as VSWR is a realtion betweem transmitted and reflected power, so high VSWR means reflected power so the connection is not good so bad quality

[kenshinz]

VSWR problems will give you bad quality, as VSWR is a realtion betweem transmitted and reflected power, so high VSWR means reflected power so the connection is not good so bad quality

is there any threshold value to know that? to judge bad vswr i mean


BR

[gprastomo]

Ideal value for vswr is 1, but according to best practice, it is impossible to achieve, practically 1.3 is enough

[RFSimanullang]

if VSWR is high and your rxlev will be very low..so the coverage will be small... there isn't no relation to quality.

[lamhd_bk]

if VSWR is high and your rxlev will be very low..so the coverage will be small... there isn't no relation to quality.

hi !
If VSWR is too high without range ( 1.0-1.3) then pathloss in the feeder will high, so it affect the coverage and path balance, traffic ...:p

[venom]

hi !
If VSWR is too high without range ( 1.0-1.3) then pathloss in the feeder will high, so it affect the coverage and path balance, traffic ...:p

You'll receive bad rxlevels if the vswr alarms are coming up. Now why VSWR comes up? If there is any connection loose or disjoints then it will cause the leakage of the RF Signal effecting in VSWR alarm. The losses will increase causing low transmission of signals, which will effect of receiving bad signals. Your site behaviour will change due to low rxlevels because if there are level based handovers enabled then the measurements are reported wrong, having BAD KPIs, in short the site health is very badly effected !!

[ghassen]

hi all,

could someone give the explanation about vswr effect in drive test measurement?

it means that there is a reflection into the combiner and this may lead to a perturbation in the oscillators located on the combiners and carrier unit
if the vswr is too high please check first if the cable connectors are tied because connectors can generate discontinuities and then these discontinuities will lead to a higher vswr

[kenshinz]

it mean...we refer to rxlev to know bad vswr (even no alarms comes up)when drive testing perform



You'll receive bad rxlevels if the vswr alarms are coming up. Now why VSWR comes up? If there is any connection loose or disjoints then it will cause the leakage of the RF Signal effecting in VSWR alarm. The losses will increase causing low transmission of signals, which will effect of receiving bad signals. Your site behaviour will change due to low rxlevels because if there are level based handovers enabled then the measurements are reported wrong, having BAD KPIs, in short the site health is very badly effected !!

[da_manole]

it's not easy to see BTS vswr from a drive test. If you will check same route with different loadings you will find some differeces. 3 db means for a BTS 1/2 from it's power.In the field 3 db it's not so much.(body loss it's 6 )
If this is a need for you you should fix some measurement points in line of sight ,5 minutes stationary test.You should measure the pilot(not Rx what are depending by loading).....