71–80 of 93 posts
Quick summary: > Many navigational and meteorological satellites carry a search and rescue (SAR) repeater which is intended to receive UHF emergency locator beacons and rebroadcast them in the L-band or higher. However the repeaters appear to be picking up all sorts of other signals from the ground, including voice transmissions.
Makes me wonder if these ever were used out-of-spec for transmission deliberately by parties. (Thinking spy stuff but it could also be just hijinx.)
Quick summary: > Many navigational and meteorological satellites carry a search and rescue (SAR) repeater which is intended to receive UHF emergency locator beacons and rebroadcast them in the L-band or higher. However the repeaters appear to be picking up all sorts of other signals from the ground, including voice transmissions.
Makes me wonder if these ever were used out-of-spec for transmission deliberately by parties. (Thinking spy stuff but it could also be just hijinx.)
Few things evoke feelings of the early internet like intercepting unencrypted communications in the wild with off the shelf hardware and software. It's some how comforting to realize this is still possible today.
If the local authority or civilization corrupted, good luck rebuilding it.
Earlier quoted context omitted.
You still need to exchange keys. You can't get around that. Otherwise, how do I know the public key you sent me over the radio is YOUR public key and not someone else with a more powerful radio?
By having the key signed by someone who you trust. Which in a military typically means the central command.
Earlier quoted context omitted.
Considering how much progress that has been made in encrypting internet traffic radio seems painfully slow in evolving to be more secure. Edit: specifically radio protocols not carrying internet traffic
Aren't there FCC regulations that forbid encryption over non-military radio?
Also, do bear in mind that most people don't need to care what the FCC says, or stick to their rules. I'm currently operating equipment that quite thoroughly violates FCC rules, and there's not a thing anyone can do about it :-D
My father is a radio lover, a DXer, and sometimes nearly contemplated a ham license. So I grew up with him listening to shortwave and other bands, he explained all the concepts, WWV would be on for two hours at a time (you could literally count every minute). Another fixture was the police/fire scanner that would be on most evenings, especially when we heard sirens. Dad put up a nice rotary Yagi VHF/UHF tower for the…
I guess you're in the UK? The UK has this really weird law where it's legal to listen to anything but you may not repeat what you heard. I don't know of any other country that has that stipulation. In most of Europe you can listen all you want and talk about it. I think in the US some frequencies were forbidden to listen to and to this day these are blocked on scanners. Not sure why as analog cellphones are long obso…
My father is a radio lover, a DXer, and sometimes nearly contemplated a ham license. So I grew up with him listening to shortwave and other bands, he explained all the concepts, WWV would be on for two hours at a time (you could literally count every minute). Another fixture was the police/fire scanner that would be on most evenings, especially when we heard sirens. Dad put up a nice rotary Yagi VHF/UHF tower for the…
I guess you're in the UK? The UK has this really weird law where it's legal to listen to anything but you may not repeat what you heard. I don't know of any other country that has that stipulation. In most of Europe you can listen all you want and talk about it. I think in the US some frequencies were forbidden to listen to and to this day these are blocked on scanners. Not sure why as analog cellphones are long obso…
Quick summary: > Many navigational and meteorological satellites carry a search and rescue (SAR) repeater which is intended to receive UHF emergency locator beacons and rebroadcast them in the L-band or higher. However the repeaters appear to be picking up all sorts of other signals from the ground, including voice transmissions.
Makes me wonder if these ever were used out-of-spec for transmission deliberately by parties. (Thinking spy stuff but it could also be just hijinx.)
Earlier quoted context omitted.
For amateur radio, but no in general.
And it's not even actually illegal for amateur radio though there continues to be debate on the topic due to the phrasing. I do think that encryption is firmly outside of the amateur culture in most cases, but legality is well covered here: https://www.n5dux.com/ham/files/pdf/Data%20Encryption%20is%2...
I mean, in a sense it was - you're trying to make thing with long runs of patterns look as much like noise as possible, which is the goal of encryption - but in order for it to work as a modem both ends have to have the same "key" which was a very short LFSR that would pull into sync during the training burst.
In practice, at least in the UK, you can more-or-less do what you like as long as you're not making a nuisance of yourself. You literally cannot pay Ofcom to investigate anything on the amateur bands, although you might get a lot of grumbling from daft old bastards.