Batboard

I've heard of the AVS boards that can be installed in the HT1000 (and I would assume all Jedi radios) to enable some sort of analog scrambling. I'm more than just a little curious about this and would appreciate any links or other information, including part numbers and availability of said items.

Hello.

What you are talking about is called a voice invert scrambler, this is so insecure, one simply needs to run it thru one of the dozens of descramble devices.
http://www.ramseyelectronics.com/cgi-bi ... n&key=SS70

http://hometown.aol.com/ctpds49/index.html

http://www.pcs-electronics.com/Guide/Schematics/7.jpg

Even the Motorola FRS can come with this level of scrambler, cordless phones have long since given up in favor for digital modes.

Thank You.

Did Motorola have one? I heard that it was a straight plug in board in the Jedi radios.

Although it is the easiest thing in the world to listen to with a $50 invsersion circuit, it will keep 95% of the people out there in "scanner land" from listening in. Just realize that it is not secure- there are ones who will hear you. Don't say anything that you'll later regret.

That's fine. I'm not looking for top notch encryption or anything like that (right now). I'm just looking to keep some scanner chasers away.

The AVS boards made by Motorola are a direct
plug-in. They are compatible with 'C and 'D'
revision HT-1000's which have what they call
an 'advantage port'. The part # is NTN8318
and they retail last I checked at $299/per.
Nowhere near as secure as the digital DES/DVP,etc. formats but these do not need a
keyloader and keyload cables. The RSS last I checked was $59. for HT-1000 AVS and utilizes the standard programming cable and RIB. There are also boards available for the GP-350, different board and different AVS RSS, no experience with those.

As someone who is pretty green about this stuff (I have a BASIC understanding, but that's it)...

Is there some secret place on M's web site to get info or order these? I'm looking everywhere on mot.com as well as Google, and that part isn't coming up.

Thanks for the info so far. It does help. I'm just kinda hell bent on getting these - just for the heck of it.

Hey Cowthief! You remember when "M" made those cordless phones (46Mhz & 49Mhz) that had the "voice invert scrambler"..I was listing to radio traffic down in Arizona where a few Taxi cab companys used the inverted speech. (most likely so the Competitors could not steel another cab companys radio-call) I had one of those phones, I put the mouthpiece up to the speaker of the scanner, & you guessed it! It came out the receive end of the phone "in the clear" ! Sniper, Its not worth, trying to keep some scanner chasers away. not with that low level encryption! but have fun! later Ed

Well, I wouldn't mind going to some level of encryption, but I'm not aware of that being available on the HT's, so I'd need to foot the bill for some new gear, and the better half would have something to say about that!

Copy That! I did discover that by accident, thought I'd post it for the sake of history. humor, whatever.. good luck with your project! Ed

Hello.

If that is what you want, then there are companies that can supply you with modules for just about any radio, really tiny things.
The last time I checked, $30 to $80 price range, and yes, they can provide the correct plug for your radio.
There are also semi-digital boards out, what thi does is to create a set of key tones, this means you would have to adjust the descrambler every time the radio keys, a bit of a pain, still cheap, also multi-invert boards, but remember, the more stages, the poorer the audio.
Check the radio pub's, like 2 way dealer, they have ads for this type of thing.
The last time I had a call for this, I used maridian(sp?) they also make/made? tone CTCSS boards, they worked OK, audio quality was good, not great.

Thank You.

P.S.

There ARE digital crypto boards, aftermarket.
But, they are not cheap.

Thank You.

Hello RadioEd,

I recently boght one of those Cordless Motorola Secure(voice inversion)Phones for the house. My older 49MHz phone bit the dust and this one was on e-bay at the right price. Although it does sound like Donald Duck on the Scanner it is far to easy to decode as you pointed out. I think the voice quality does suffer a little due to the encode/decode circuitry losses so actually think I would be better off with a plain cordless.

When I do sensitive business on the phone such as over the phone banking etc. I don't use anything with an antenna!

Also, if the person you are speaking with, is on a phone that is monitorable, you have just defeated the whole purpose.

Something most people don't consider.

For those wanting some neat info. on this and other security issues here is a very comprehensive site:

http://www.tscm.com/

Eddie

Hi N4UMJ! Try pressing the "demo" button on it for what does the book say? (3 seconds)then leave it in that mode! & then put it up to some radio traffic that has inverted speech... I may have reversed the process. either way.. In my line of work, we gave a demo to the Taxi company, dispatch manager, that was also using it...(we re-played it from a tape) & told them they should change/upgrade there system? 2 months later, they called us up & asked for a price quote...we passed it on to a radio-shop that fixed them up.....Ed