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Author Topic: software for voice inversion scrambling ??  (Read 1992 times)
GM1ZVJ
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Posts: 152




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« on: March 08, 2007, 10:26:30 AM »

Is there   software freely available that will allow your outgoing audio to be scrambled by speech inversion ?? I know there is software for allowing incomming signals using simple speech inversion to be decoded just wonder if there is software available to allow outgoing audio to be scrambled ??
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G0GQK
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Posts: 634




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« Reply #1 on: March 09, 2007, 11:02:10 AM »

Perhaps you are unaware but your UK radio license does not permit you to use methods of transmission where any messages are un-decipherable.  I am sure the same condition of licensing will apply to amateur radio operators in the USA where there has been concern about the possibility of terrorist activity in recent years.

G0GQK
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WA9SVD
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Posts: 2201




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« Reply #2 on: March 09, 2007, 07:45:53 PM »

GQK
    You are indeed correct, U.S. Amateurs may not transmit "messages in codes or ciphers intended to obscure the meaning thereof..." or "false or deceptive messages, signals, or identification."  (U.S. 47CFR97.113 is our specific rule.)

    Because the "codes" and protocols are publicly available, such modes as Packet Radio, PSK in it's many flavors, and even RTTY are accepted as appropriate for Amateur Radio use.
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GM1ZVJ
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« Reply #3 on: March 10, 2007, 01:13:01 AM »

Okay first off all thanks for the replies guys regards my question on speech scrambling, yep was totally aware that speech scrambling of any sorts is in now way permitted within the terms off our licence.

the question was asked out off pure interest, anything I talk about be it on the amateur bands, 446mhz or wherever is in my mind anyway nothing special !!!!!!!!!! and am certainly not concerned enough to use speech scrambling as to precent anyone lsitening in !!!!

interesting enough this speech scrambling technique within the uk is certainly on the increase, shopwatch, pubwatch and a lot more individuals are now starting to use this technique to at least try prevent the casual listener.

just wonder if they are operating outwith the terms off there particular licence - anyone know ??

belive there is now even type approved 446mhz licence free sets available with switchable voice scrambling- although wont swear that they are infact uk type approved as opposed to just fancy ebay advert wording !!

thanks again

 

 
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WA9SVD
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« Reply #4 on: March 11, 2007, 07:59:10 AM »

You will have to check the rules and regs for the different services within your own govt's organization.
    Here in the U.S., it's probably covered in �Part 95, which covers our CB, GMRS, FRS, and MURS, which are the non-Amateur Radio services.  (Amateur Radio is �Part 97.)  Equipment for those services must all be "Certified"  by our FCC to be legally sold or used.  (Amateur transmitters specifically do not need certification; most amplifiers do.)
    In general, our FCC rules state what is specifically prohibited;  otherwise, manufacturers are pretty much able to add as many features, bells, and whistles as they see fit.
    Since the �Part 95 devices are not considered "public" transmissions, encryption techniques may be allowed in some instances.
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