Start with a bandpass filter with a 3 dB bandwith for each of the
given band and give it's own filter and whip antenna so you have a
total of 8 filters, or one for each band. An 8 pole bandpass filter
will work well, then route the initially isolated signals into a
dedicated low noise amplifiers suitable for driving a detector diode.
Take the detected signal, and drive the chart recorder or amplifier.
It is virtually impossible for a GSM bug to hide from this, but you
would well advised to use duplicates of these filters installed in
banks to give you some indication of the space domain.
You have also use broadband filters to cut up the rest of the
spectrum into small segments of interest as give them the extra
channels on the chart recorder.
Primary Cellular Frequency bands used in USA
SMR iDEN 800 806-824 and
851-869 (Filter A, B)
AMPS, IS-95 (CDMA), IS-136 (D-AMPS), GSM Cellular 824-849,
869-894, 896-901, 935-940 (Filter C, D, E, F)
GSM, IS-95 (CDMA), IS-136 (D-AMPS) PCS 1850-1910 and
1930-1990 (Filter G, H)
International GSM Frequency Ranges
GSM 400 450.4 - 457.6 MHz
GSM 400 460.4 - 467.6 MHz
GSM 400 478.8 - 486 MHz
GSM 400 488.8 - 496 MHz
GSM 850 824 - 849 MHz
GSM 850 869 - 894 MHz
GSM 900 880 - 915 MHz
GSM 900 925 - 960 MHz
GSM 1800 1710 - 1785 MHz
GSM 1800 1805 - 1880 MHz
GSM 1900 1850 - 1910 MHz
GSM 1900 1930 - 1990 MHz
GSM 3G 2110 - 2170 MHz
GSM 3G 1920 - 1980 MHz
GSM TDD 1900 - 1920 MHz
System Band Uplink Downlink Channel Number
GSM 400 450 450.4 - 457.6 460.4 - 467.6 259 - 293
GSM 400 480 478.8 - 486.0 488.8 - 496.0 306 - 340
GSM 850 850 824.0 - 849.0 869.0 - 894.0 128 - 251
GSM 900 (P-GSM) 900 890.0 - 915.0 935.0 - 960.0 1 - 124
GSM 900 (E-GSM) 900 880.0 - 915.0 925.0 - 960.0 0 - 124, 975 - 1023
GSM-R (R-GSM) 900 876.0 - 880.0 921.0 - 925.0 955 - 973
DCS 1800 1800 1710.0 - 1785.0 1805.0 - 1880.0 512 - 885
PCS 1900 1900 1850.0 - 1910.0 1930.0 - 1990.0 512 - 810
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Received on Sat Mar 02 2024 - 00:57:18 CST