Cellular – Signal strength tools & apps

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The “bars” represent the Received Signal Strength Indication or RSSI.

Field Test option on an iPhone can be activated by dialing *3001#12345#* + “Call” changes the RSSI to a dB value.

Galaxy S5. Go to “settings”; “about device”; “status”; Signal strength is shown in units of “dBm” (Decibel-milliwatts)and “asu”(Arbitrary Strength Units)

What does 5 bars mean?

# of ‘Signal Strength Bars’ Numeric Range (approx.)

No Signal Greater than - 125dBm

1 to 4 -65 to -125 dBm

5 Less than -65 dBm

Note: 3 Signal Strength Bars = -100 dBm = 0.1 picowatt (pW)1 Signal Strength Bar = - 120dBm = 1 femtowatt (fW)calls completed in a weak signal area require up to 6 times asmuch power for call completion.

A cellular signal booster system consists of an external

antenna, a signal boosting amplifier and an internal antenna.Signal Boosters can significantly improve cellular device performance

Weak Signal ?– No Problem

A ground plane is a horizontal, flat, electrically conductive

metal surface used to reflect radio waves.

In antenna theory a ground plane must have a radius of at least ¼ wave length of the lowest frequency being transmitted. LTE band 12 uplink frequency range is 698 - 746 MHz . Therefore, the ground plane should have a radius of at least 4.023 inches

When a cellular signal booster external antenna lacks a ground plane it dramatically reduces both uplinked and downlinked signal strength.

Why do I need a Ground Plane?

LTE Band Uplink Frequency

Downlink Frequency

Carrier

12 698 – 716 MHz 728 – 746 MHzATT, T-Mobile, Metro PCS

13 777 – 787 MHz 746 – 756 MHz Verizon

17 704 – 716 MHz 734 – 746 MHz ATT, Bell, Rogers, Fido

26 814 – 849 MHz 859 – 894 MHz Sprint, Boost Mobile

5 824 – 849 MHz 869 – 894 MHz Verizon, ATT,

4 1710 – 1755 MHz 2110 – 2155 MHzATT, T-Mobile, Metro PCS, Verizon, Bell, Rogers, Fido, Telus

25 1850 – 1915 MHz 1930 – 1995 MHzATT, Sprint, Boost Mobile

Who uses what

Cell phone coverage

www.rootmetrics.com/check-coverage/ - Coverage Map app

www.opensignal.com – open signal app

www.deadcellzones.com/coverage-maps.html

How to predict Cellular reception

CoverageMap app

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Opensignal towers-web

Open Signal app -1

Open Signal app -2

*#06# – Displays IMEI*#43# + “Call” – Displays call waiting status*43# + “Call” – Enables call waiting#43# + “Call” – Disables call waiting*#21# – Displays call forwarding status##002# + “Call” – Disables all call forwarding*33*pin# – Enables call barring#33*pin# – Disables call barring#31#phone-number + “Call”

– Blocks caller ID for the current phone call*3370# + “Call” – Enables “Enhanced Full Rate” and improves

voice quality on GSM networks (may impact battery life)

*#5005*7672# + “Call” – Displays your carrier’s message center phone

number

Smart phone codes

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