404-10179-410167 J RETURN TO CIA — B. ckground Use Only ee tet attend eae 8 as aes Dm ee ® bln Do Not Reproduce / ee 04 sy aah TSEGICAP MOMS 864 3 January 1963 , MEMORANDUM FOR ; Ghief, Special Affaire Staff Mr. A. Rodriquez oe ATTENTION SUBIECT : Radio Switch Equipment for Demolition Firing Purposes 1, After our conversation on this subject on 30 December, TSD/AOB, and the question was discussed with Mr. Mr["__)TSD/GRF. The following information i¢ forwarded ¥ Consideration as a result of our discussions, for ¥ ww. Be , med Audio Operations Braachy-recommends two companies as sources of equipment of this nature, These companies have experience, under classified contracts with TSD, in producing reliable equipment for special purposes of this sort. They also, of course turn cut commercial equipment of good quality for normal communications needs, These sompanics are? ‘ 2 {Motorola Chicago, Illinois ») bi Kell, Cambridge, Massachusetts 29,08 The TSD VHF radio switth edat saidnt for demolition needs wae developed for us by/Mctorola. )ransistorised sets have been produced to mé6t the apecial needa (nét for demolition purposes) of other SAS projecta. 3. Im the opinion of both persons consulted, the expenses noted in our firet discussion should have produced a reasonable amount of workable equipment if the source was both capable and reliable, ‘SD recommends the use of frequencies in the VHF /WHE spectrum for equipment of this sort and crystal tuning control for reasons of relialiity, selectivity and rejection of spurious signals. ; . 4, Inexpensive equipment of Japanese or American manufacture im the citizen’ band frequency ranges for toys, radio control devices, 2... - °
‘/py _ RETURNTO CIA | Background Use Only ’ «Do Not Reproduce Page Two short range communications, etc., is available from many manufacturers, Our Quick Reaction Facility can produce a small number of radio switches based on these devic2s with a considerably lesser degree of security {rom false signal triggering with a lead time of 6 to § Weeks, Simple mechanical protection against accidental triggering can be gained by inclusion of counting switches, for example, which require a preset number of firing impulses intentionally transmitted to produce the final closure of a relay and firing of a charge. 5. Reliability of operation in terms of response toa tranemitted signal of a given power is quite difficult to predict when conditions of antenna length, orientation and exposure cannot be foreseen, Location of the receiver.in a target building will aiso have a strong bearing on ‘range’ from the transmitter, Bullding construction, intervening obstacles and interference from other nearby radio fre« quency sources will affect performance of the set. 6 you wish to discuss the pro*'lems in greater depth, we recommend a conference with audio ‘echnicians or engineers, It may serve to clarify the appropriate haracteristics which special or m modified commercial equipment should possess to megt the needs of your operation. Pyiblems of camouflaging the explosive ox incendiary materi] to serve operational requirements would be minor compared to the necessary consideration of effects on the receiver switch concealed within which could have important effects on performance. Distribution: 2-G/SAS