{"id":5046,"date":"2023-01-29T07:00:34","date_gmt":"2023-01-29T07:00:34","guid":{"rendered":"http:\/\/www.theblackvault.com\/documentarchive\/?p=5046"},"modified":"2024-01-29T15:20:10","modified_gmt":"2024-01-29T15:20:10","slug":"ultrasonic-listening-devices-wiretapping","status":"publish","type":"post","link":"https:\/\/www.theblackvault.com\/documentarchive\/ultrasonic-listening-devices-wiretapping\/","title":{"rendered":"FBI Files: Ultrasonic Listening Devices \/ Wiretapping \/ Countermeasures"},"content":{"rendered":"

Background<\/h3>\n

Devices exist which, by sending an electrical impulse of ultrasonic frequency through a telephone circuit by tapping, will permit remote surveillance of any office in which a telephone is located by utilizing the telephone microphone as a pick-up. Such eavesdropping may be accomplished without additional wires and is possible even though the handset is in a \u201chung-up\u201d position.<\/p>\n

Below, you will find thousands of pages archived from the FBI on ultrasonic listening devices, wiretapping, violations, and countermeasures.<\/p>\n

Document Archive<\/h3>\n

\u00a0Ultrasonic Listening Devices \/ Wiretapping, 1945 – 1989 (80-HQ-760)<\/a>\u00a0– Release #1 – [1,064 Pages, 200.1MB]<\/p>\n

\u00a0Ultrasonic Listening Devices \/ Wiretapping, 1945 – 1989 (80-HQ-760)<\/a>\u00a0– Release #2 – [8 Pages, 2.0MB]<\/p>\n

\u00a0Wiretapping Violations (139-HQ-1)<\/a> – Release #1 – [218 Pages, 140MB]<\/p>\n

\u00a0Wiretapping Violations (139-HQ-3)<\/a> – Release #1 – [37 Pages, 2.5MB]<\/p>\n

\u00a0Countermeasures (80-HQ-805)<\/a> – Release #1 – [2,666 Pages, 121.8MB]<\/p>\n

\u00a0Countermeasures (80-HQ-805)<\/a> – Release #2 – [6 Pages, 0.5MB]<\/p>\n

Countermeasures (80-HQ-805)<\/a> – FBI Release – Other Government Agency Material (CIA, FTC and SEC) [31 Pages, 1.8MB]<\/p>\n","protected":false},"excerpt":{"rendered":"

Background Devices exist which, by sending an electrical impulse of ultrasonic frequency through a telephone circuit by tapping, will permit remote surveillance of any office in which a telephone is located by utilizing the telephone microphone as a pick-up. Such eavesdropping may be accomplished without additional wires and is possible even though the handset is<\/p>\n","protected":false},"author":1,"featured_media":18869,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"episode_type":"","audio_file":"","transcript_file":"","podmotor_file_id":"","podmotor_episode_id":"","cover_image":"","cover_image_id":"","duration":"","filesize":"","filesize_raw":"","date_recorded":"","explicit":"","block":"","_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_post_was_ever_published":false},"categories":[33,4],"tags":[1103,302,1105,1102,1104,1101],"class_list":["post-5046","post","type-post","status-publish","format-standard","has-post-thumbnail","category-fbi-files-domestic-foreign-intelligence","category-intelligence","tag-eavesdrop","tag-fbi","tag-listening-device","tag-phone-tap","tag-ultrasonic","tag-wiretap"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t