Help to understand scrambling options in the icom 6062d cps ?

[moj]

Hi ppl !

I could do with some help understanding the scrambling options on the cps menu , I have the UT126H and the UT110R board installed into my radio and as far as I know the UT110R board can only be used in analogue mode ?

When I click on the scrambling menu when the scrambling box is enabled there is three options

Obviously the 1st one is using either the UT109R or UT110R scrambling board in analogue mode

The 2nd option is INVERSION scrambling which gives me an encryption key list numbered from 1 to 63 so I'm guessing in digital there is only the 1 to 63 codes to choose from but there again if I'm wrong let me know ?

And the 3rd option is OTHER-T , what exactly is this and does it work in both digital and analogue modes ?

and I see there's an extra code box that's enables once the OTHER-T is enabled so is this a higher security feature for both analogue and digital modes and can the key be made to any length or even left blank yet still choosing the 1 to 63 encryption key list ?

I'm guessing this list is similar to the Motorola mototrbo key id feature which adds security on the basic and enhanced encryption etc ?

Also if these encryption keys are enabled on digital mode will this mute on another radio if a different key is setup or will the other radio hear the scrambled audio come through etc ?

hope i've not baffled anyone and thanks for any help in advance

 

[n5ims]

Voice inversion is a very old method of "scrambling" an analog signal. It's pretty easy to both implement and defeat. Basically they take the analog voice signal and change the zero point of the signal so a normally tuned signal doesn't sound right. To decode, they simply reverse the process. This is a bit oversimplified, but is basically what happens.

https://en.wikipedia.org/wiki/Voice_inversion

 

[ElroyJetson]

Inversion type scrambling sounds exactly like tuning in on the upper sideband of an AM signal, using a lower sideband receiver. (Or vice versa.)

Higher frequencies are reproduced as lower frequencies. Lower frequencies are reproduced as higher frequencies.

Basically, people sound like ducks speaking a foreign language after their voice is inverted.