Subcarrier Modulation:

 10 - 500 kHz - Most Commonly Used Subcarrier Bugging Frequencies

 15 - 150 kHz - Typical Broadcast FM/TV Subcarriers (TV/FMSubC)
  0 -  15 kHz - Typical Broadcast FM L+R Signal (Mono)
       19 kHz - Typical Broadcast FM Subcarrier - Pilot
 23 -  53 kHz - Typical Broadcast FM Subcarrier L-R Signal (Stereo, 38 kHz center)
       57 kHz - Typical Broadcast FM Subcarrier - RBDS/EAS
       67 kHz - Typical Broadcast FM Subcarrier SCA/Musicast/Musak
       92 kHz - Typical Broadcast FM Subcarrier SCA/Musicast/Musak

 15 - 105 kHz - Typical Broadcast Television Subcarriers (TVSubC)
  0 -  15 kHz - Typical Broadcast TV Audio L+R Signal (Mono)
    15.75 kHz - Typical Broadcast TV Subcarrier - Pilot
    31.50 kHz - Typical Broadcast TV Subcarrier L-R Signal (Stereo)
    62.94 kHz - Typical Broadcast TV Subcarrier - SAP Secondary Audio
   102.27 kHz - Typical Broadcast TV Subcarrier - Cue Channel

   2 - 10 MHz - Typical Video Component Subcarriers (4.2 - 8 MHz common)

5 kHz - 750 kHz - Realistic Subcarrier Threat (Audio)
5 kHz - 15 MHz - Realistic Subcarrier Threat (Video)

Note: A typical FM broadcast may contain 2 to 12+ subcarrier voice
channels in addition to the main signal, and subcarriers may have
subcarriers.

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VLF and Carrier Current Type Bugs

  9 kHz -   490 kHz   Carrier Current 47 CFR 15.219 Auth (250 mv max.)
490 kHz - 1.705 MHz   Lossy Cable     47 CFR 15.221 Auth (1000 mv max.)
450 kHz - 30.00 MHz   PLA Systems     47 CFR 15.207 Auth (30 mv@ft/30ft max.)

  3 -   200 kHz    300 mw        High Grade Pro Bugs (over 500$ each)
100 -   200 kHz   50-100 mw      Older VLF Bugs
120 -   200 kHz   30-50  mw      Pre 1990 intercoms
200 -   300 kHz   30-50  mw      Post 1990 intercoms
300 -   400 kHz  250-450 mw      TELCO Line transmitters (355 kHz popular)

300Hz - 30 kHz  Cable TV Carrier - Hardwired Microphones (Baseband Audio)
30 kHz -300 kHz Cable TV Carrier - Coaxial Bugs (Wideband Audio/Video)

100  -  450 kHz Threat Window #1 Most CC Bugs
3 kHz -   3 MHz Threat Window #2 Expensive "Pro-Grade" Bugs
5 kHz -  32 MHz Threat Window #3 Popular WJ Carrier Current Rcvr
3 kHz -  50 MHz Threat Window #4 Realistic Threat Window for Telephone Wire
15 MHz - 70 MHz Threat Window #5 Audio/Video "Micro-Wire" RF circuits

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VLF Devices

 25 kHz -  90 kHz       Tape Recorder Bias Osc-Low End (35-45 kHz Common)
 80 kHz - 145 kHz       Tape Recorder Bias Osc-Mid Range (88.2, 96, 100 kHz Common)
100 kHz - 325 kHz       Tape Recorder Bias Osc-Pro Grade (100, 150, 300 kHz Common)
 40 kHz -  50 kHz       Tape Recorder DAT/Hi8 (44.1/48 kHz Common)

  4 kHz -  35 kHz       Recorder Audio Servo Noise (10-20 kHz Common)

 7 kHz - 35 kHz Video Camera VLF Detectable emissions
   15.750 MHz   Common NTSC Video Camera
   15.734 MHz   CCD/PCB Video Camera (very easy to detect)
   15.625 MHz   Common Video Camera

Also, be aware that ultrasonic signals are emitted from most VLF
devices. (Utilize a EOD/Bomb Tech Stethoscope, and Spectrum Analyser
with an wideband ultrasonic transducer).

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WECO Bugs
Boosted/ultrasonic audio coupled to Power, CATV, and Telco lines

 64 kbps to 1.5 mbps Digital Bugs       T-Carrier-Lo (T-1 and Below)
1.5 mbps to 50 mbps  Digital Bugs       T-Carrier-Hi (T-1 and T-3)
2.048 mbps           Digital Bugs       Definity Circuit Pack Bug
32 mbps              Digital Bugs       TMS Channel/Backplane bridge
Designed to transmit QAM on Microwave Spread Spectrum (2.4-9.0 GHz)

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      [*]  VLF Emission and Subcarrier Detection

      [*]  Common Eavesdropping Frequencies used by Amatuer Eavesdroppers

      [*]  Professional and Law Enforcement Bugging Frequencies

      [*]  Surveillance Device "House" Frequencies/Bands

      [*]  Federal Surveillance Frequencies

      [*]  Surveillance and Spy Satellite Frequencies

      [*]  Spread Spectrum and Frequency Hopping Bug Frequencies

      [*]  Bandwidth Resolutions and Filters

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