Hello, Can anyone tell me if Encryption exists on Low-Band, And if so, Can someone provide me with an example of it?
Low-Band Encryption?
- Thread starter EFjohnsonVHF
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During this past summer sporadic-E openings I would hear rolling code voice inversion on the 39 MHz band. This was on a path from southern California to the Pacific Northwest and BC Canada.
In F2 season there was encrypted comms (not voice inversion) in the 32/36 MHz band but this was about 5 years ago when the band was opening every day in the fall/winter months. Based on the freqs it may be military related.
If nobody beats me to it, I can post some audio samples once I dig them up.
In F2 season there was encrypted comms (not voice inversion) in the 32/36 MHz band but this was about 5 years ago when the band was opening every day in the fall/winter months. Based on the freqs it may be military related.
If nobody beats me to it, I can post some audio samples once I dig them up.
cpuerror
Member
The military uses it a lot. It sounds like white noise.
902
Member
Yes, it does. I worked on Motorola Syntor-X mobile radios with DVP cards in the control head deck. It was intact and used at the time on a 37 MHz simplex system.EFjohnsonVHF said:
902 said:
Low-Band with encryption? Geez, That must make the range absolutely horrible, Unless of couse they're running some SERIOUS POWER.
cpuerror said:
I know it sounds like white noise, Just look at my signature and you'll know why I say this.
Military and a lot of fishing fleets run low band encryption.
The latter mostly bootleg.
The latter mostly bootleg.
902
Member
110 Watts. It was mobile to mobile, nothing on base. The weird thing was they had VHF PacRT (MO3) with unencrypted portables, so they were secure on low band, but when they got out of the car, their low power VHF stuff was unencrypted. Oops. The system's not in use anymore. They went to UHF.EFjohnsonVHF said:
Astro25
Member
If it sounds like white noise it was probably DES/-XL.
I personally think that DES sounds better than DES-XL. Sounds less windy/"robotic".
I personally think that DES sounds better than DES-XL. Sounds less windy/"robotic".
I always thought the Marconi DM-8000 modules in the Icom IC-H10SR portables sounded incredible. It was almost like clear voice.
902
Member
I have. We use DES-OFB all the time on P25 digital. There is no difference in the sound of encrypted vs. unencrypted P25 digital whatsoever.Ray_Air said:
In one of my jobs (Not the volunteer EMS) I sometimes use plain DES on Motorola Sabers, and I must say that the audio sounds pretty good, The only thing I don't like is the fact that is slices down the range like a hot knife through butter.
Sure, encryption is possible on any band.
Slightly OT, but what about low band trunking? I'm sure it's possible, but I've never heard of a VHF low band trunked system.
Slightly OT, but what about low band trunking? I'm sure it's possible, but I've never heard of a VHF low band trunked system.
Neither have I, But I will look on google and see what I can find.
n4voxgill
Silent Key
the military uses encryption down on HF. I have heard both military, coast guard and DEA HF comms when they would say go green and you get a really weird noise, not like white noise.
n4voxgill said:
Me too!
If I remember right when I was a kid we would head up to the lake. The Coast Guard at times would switch from channel 22 alpha to 22 bravo and we could not hear a thing they were saying. All we heard was a steady squelch sound, your white noise if you will.
Also when I was younger and lived back at home the local police were on low band. They used a voice inversion on 45 megahertz, sound like Donald Duck. We actually made a decoder box for it that attached to the antenna jack. It was pretty cool. They have some sort of encryption now on the UHF system but in all honesty I bet they don’t know how to use it.
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