Released under the John F. Kennedy Assassination Records Collection Act of 1992 (44 USC 2107 Hote). | DATE: 11-14-2017 JFK Assassination System Date: 4/27/201 Identification Form Agency Information Cr nt ee v9.1 | Docld: 322787039 Page 1 AGENCY: FBI RECORD NUMBER: = 124-10196-10315 RECORD SERIES: HQ JUNE MAIL AGENCY FILE NUMBER:  62-9-9-1059 Document Information ORIGINATOR: FBI FROM: SAC, CG - TO: DIRECTOR, FBI TITLE: DATE: 08/20/1962 PAGES: 4 ‘SUBJECTS : , THP, TESUR, BUSS, ACT DOCUMENT TYPE: PAPER, TEXTUAL DOCUMENT CLASSIFICATION: — Secret RESTRICTIONS: 1B; 1C CURRENT STATUS: — Redact DATE OF LASTREVIEW: — 11/16/1998 OPENING CRITERIA: © INDEFINITE COMMENTS : INC RESPONSE MEMO
| Released under the John F. Kennedy Assassination Records Collection Act of 1992 (44 USC 2107 Hote). ( DATE: 1s vl4d- 2017 ty, oo oo hy . “ t , ‘ — SA cy ones » CREE $5 (92-350-5) ~~" ‘Ragust 28, 1962 Poa . mo Director, eB miele fe) — — Ls id 4 q JUNE TOP HO opium PROGRAM CHICAGO DIVISION | CG 6486-C* ALL | Reurlet 8-20-62. Beate ah Referenced letter requested : advice of the FBI Laboratory concerning use of a simples circuit to enable operation of two MITES on a selective basis over the same telephone line. | A simplex circuit can be used with a polar relay for the control of two MITES. Circuit for this is the same as that appearing as Figure 6, page 36, of the Handbook of Technical | Equipment, except that the transformers are omitted and the circuit is established through one side of the line to ground. ~ - . Experience has shown that the unbalanced condition created by establishment of a control circuit in this manner may introduce noise into the microphone line. Switching of two MITES on one line can be more easily accomplished by the use of diodes which are smaller than the polar relay and much more easily concealed. There is attached a diagram showing method of using diodes. I is recommended that this circuit be utilized in preference to the simplex circuit as it is simpler to install and will not introduce noise into the microphone Line. ez f8 r a 2 £ G- AEG S . CLASSIFIED BY St tess 0 [AS ry = Enclosure DECLASSIFY my Cy ES ft | , 1 -(80-791 (s) | (5*«) B RAMic: (10) © Belmont be g Calishan Do i. ~, Conrad s ecoach , : Rosen Sullivan Tavel Trotter —— Tele. Room Holmes Gandy MAIL ROOM ELE  Docld:32287039 Page 2
Released under the John F. Kennedy Assassination Records Collection Act of 1997 (44 USC 2107 Hote). DATE: 1714-7017 ~ ‘ OrTiONAL FORM NO. 10 C o 4 UNITED STATES GOV% RNMENT od ° ) Memorandum TO DIRECTOR, FBI DATE: 8/20/62 ATTN: FBI LABORATORY - ROM: SAC, CHICAGO (92-350 Sub E) ELECTRICAL SECTION SUBJECT: Q | , JECT: _TOP HOODLUM PROGRAM . JUNE ‘CHICAGO DIVISION ~ CG 6486-C* At the present time Chicago is operating a MITE approximately 14 miles distant from the Consolidated Plant. Only one trunk line is available for this installation, but. it would be highly desirable to locate a second MITE in an adjacent room and be able to select that MITE which is most productive at the time. It is pointed out that some line noise though not objectionable is prevalent in the circuit due to the distance involved and it would be highly undesirable to add to this noise rati6...' ~ The Laboratory is requested to advise if a Simplex circuit could be utilized to select one of two audio circuits where MITES are utilized. If so, how can damage to these units be avoided? If a Simplex circuit’ can be utilized in the aforementioned installation, the Laboratory is requested to furnish a detailed schematic outline along with any helpful observations as it is pointed out the Chicago Division has not utilized Simplex circuitry to date. aE det Phe, dee. = ¢ det (RM) - Chicago | 1-134-44 i | LHN: mec v | Docld: 32287039 Page 3