...killing batteries. Bluetooth and WiFi left on are sure ways to kill the battery right in the middle of that important call. Turn 'em off if you're not using 'em.
Of course, it would make sense for these features to have kill switches in prominent view on the Home screen... I don't know of any interface that offers this, just silly little indicators anyone short of Hawkeyes would miss.
the press at least being able to listen, introduces that necessary DELAY that the police may carry on. It's for THE POLICE to judge whether or not a RADIO STATION gets a functional scanner.
Use a bit of common sense before you try a shootdown. I don't care if your UID only has five digits.
no, your first guess was right - the valves were mounted on pegboards (literally) with walk-through access that a tech could visually inspect the valves and replace any that weren't lit. It was a full time job.
GSM jammers work on 900MHz and 1800MHz bands. They won't touch 800MHz. They also work at very short range. Repeaters will just retransmit the signal (either verbatim or minus any CTCSS tone) as long as they receive the correct key carrier. It's just waves, be it clear voice, data or encrypted stream.
who the hell modded this flamebait!? It's absolutely spot on, they're supposed to be publicly transparent - including radio comms - since they're paid for with PUBLIC MONEY!
The police bought the radios not knowing a: what they'd use them for, b: how many would be deployed, c: how to manage key systems, d: how to manage cross traffic, e: how much they'd cost to maintain/repair, f: how they would affect regular cell traffic and vice versa (hint: it's pretty fucking dire in the middle of Nottingham at the best of times) and from that; if using them in place of the UHF gear (that was already well managed) rather than either sticking with the UHF period or only using TETRA in special tactical operations (such as stinger deployments) was a smarter idea, keeping both the public and the media happy and prolonging the useful life of keypairs.
hang on, these are SUPPOSED to be PUBLIC SERVANTS. Aren't they? That's what all the literature says. "To protect and SERVE"?
A little history:
The precursors to State-run police forces were a gang on private enforcers known as the Bow Street Runners, who patrolled most of London selling their services to anyone who could afford them or needed them badly enough - for example, to dish out vigilante justice to someone who had welched on a deal or raped someone's dog. They did their job so well, the Government wanted their piece of the very lucrative pie, as it were, and regulated them - giving them Lawful authority, Legal powers and the right and duty to bring criminals - wherever in England they found them - to justice, rather than wait for someone to go cap in hand to them and beg. In return the Runners gained immunity from prosecution in case - or rather, when on the many occasions - someone they were pursuing or had apprehended, died.
Current police forces still operate this vigilante, mercenary approach: cherry picking jobs and only working for those who hold the chequebooks. DO NOT expect protection from the police, that is not what they are there for: they are there to protect PROPERTY. For PERSONAL PROTECTION you need a BODYGUARD.
...FYI:TETRA is a digital scrambled radio service that runs over (or under, depending on how you look at it) the cellular network. You can even make cell calls to regular mobiles and landlines from the portable terminal gear (usually badged Motorola round here). Yes I understand how they'd not want Jack Bankrobber knowing where the stinger's going to be deployed, but to deny press access to radio traffic, as they do here, smacks of criminals who don't want their communications monitored and possibly publicly aired. But that's just my paranoia talking.
That's what I do. I never use two drives from the same batch in an array*, because a physical fault on one is more likely to be present on another - and that's a guaranteed fail. I think this is why they not only use several different systems to check each other on the Shuttle, they use different//architectures// so a physical flaw that affects one/of a batch/of a series/of a type is less likely to affect the others. I guess it would be like using a Z80, a Motorola 68k and a 80386 to check each other - well blow me, it's old tech, but what fries a 68k a Z80 would most likely survive.
*it's actually rare that I use drives with the same capacity in my arrays! In my current scratch array, built for very high throughput, I have 80GB Hitachi, 80GB Seagate, 120GB Seagate, 160GB Seagate, 200GB Maxtor, in a RAID0 for 400GB. OK there's lots of space wasted, but hey - I built it for throughput not capacity.
no... on military aircraft they use hardcoded RTOS embedded systems. Layers of interfacing and the associated lag can mean the difference between a missile flying through the correct window and blowing an ammo dump or flying through the wrong window and blowing up a school full of kids.
I think in a **perfect world**, the chances of catastrophic failure in the collective hardware (or relevant to this discussion, the decisionmaking process) of such a system are zero. What I've experienced in terms of hardware is that the chances of an individual component failing does not change the more you add to the system. What does change is that the chances of any single component failing resulting in the total failure of the system is multiplied by the number of similar components in the system.
As an example:
A hard disk has an MTBF of say, 100,000 hours.
You build a RAID array of ten drives. The MTBF of each component drive is still 100,000 hours, but the MTBF of the array (the system) is 100,000/10 or 10,000 hours.
You build an identical array of ten drives and mirror the two to try and mitigate against data loss in case of failure of an array. Here's where the numbers get interesting. The two arrays have an individual MTBF of 10,000 hours. Taken as a single system their combined MTBF is 5,000 hours. Since the system is composed of two mirrored arrays, all you have done is halve the MTBF (so it's 10,000 hours again), halve the data capacity and double your power consumption.
So every 416 days, you should expect one drive in the 10-disk array or two disks in the 20-disk array to fail.
- Can I do a lightbulb analogy?
Say a lightbulb has an MTBF of 100 hours. You have an array of 1,000 similar bulbs on a display board. You're replacing a bulb every six minutes.
mil spec isn't proofed against hard radiation; it does some soft radiation and EM not quite up to airburst-strength pulse. Space spec has to withstand high energy radiation such as Cosmic, X- and Gamma rays way beyond what you'd encounter 5 miles below a thermonuclear burst, otherwise it'll get outside the VA belts and simply die.
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...killing batteries. Bluetooth and WiFi left on are sure ways to kill the battery right in the middle of that important call. Turn 'em off if you're not using 'em.
Of course, it would make sense for these features to have kill switches in prominent view on the Home screen... I don't know of any interface that offers this, just silly little indicators anyone short of Hawkeyes would miss.
Haw... if the animal is thus incapacitated hence unable to object to such violations, no problem!
I was just sick a little.
the press at least being able to listen, introduces that necessary DELAY that the police may carry on. It's for THE POLICE to judge whether or not a RADIO STATION gets a functional scanner.
Use a bit of common sense before you try a shootdown. I don't care if your UID only has five digits.
elephant skin, tits past the knees, bad teeth... little has changed in two centuries.
no, your first guess was right - the valves were mounted on pegboards (literally) with walk-through access that a tech could visually inspect the valves and replace any that weren't lit. It was a full time job.
Please, AC, to enlighten us do explain where I am in error?
GSM jammers work on 900MHz and 1800MHz bands. They won't touch 800MHz. They also work at very short range. Repeaters will just retransmit the signal (either verbatim or minus any CTCSS tone) as long as they receive the correct key carrier. It's just waves, be it clear voice, data or encrypted stream.
who the hell modded this flamebait!? It's absolutely spot on, they're supposed to be publicly transparent - including radio comms - since they're paid for with PUBLIC MONEY!
omfg, cellular: the least secure narrowcast system in use today!
The police bought the radios not knowing a: what they'd use them for, b: how many would be deployed, c: how to manage key systems, d: how to manage cross traffic, e: how much they'd cost to maintain/repair, f: how they would affect regular cell traffic and vice versa (hint: it's pretty fucking dire in the middle of Nottingham at the best of times) and from that; if using them in place of the UHF gear (that was already well managed) rather than either sticking with the UHF period or only using TETRA in special tactical operations (such as stinger deployments) was a smarter idea, keeping both the public and the media happy and prolonging the useful life of keypairs.
Had a little chuckle because your handle is the same as a rag journalist in the UK... oh, wait, you're not him, are you?
hang on, these are SUPPOSED to be PUBLIC SERVANTS. Aren't they? That's what all the literature says. "To protect and SERVE"?
A little history:
The precursors to State-run police forces were a gang on private enforcers known as the Bow Street Runners, who patrolled most of London selling their services to anyone who could afford them or needed them badly enough - for example, to dish out vigilante justice to someone who had welched on a deal or raped someone's dog. They did their job so well, the Government wanted their piece of the very lucrative pie, as it were, and regulated them - giving them Lawful authority, Legal powers and the right and duty to bring criminals - wherever in England they found them - to justice, rather than wait for someone to go cap in hand to them and beg. In return the Runners gained immunity from prosecution in case - or rather, when on the many occasions - someone they were pursuing or had apprehended, died.
Current police forces still operate this vigilante, mercenary approach: cherry picking jobs and only working for those who hold the chequebooks. DO NOT expect protection from the police, that is not what they are there for: they are there to protect PROPERTY. For PERSONAL PROTECTION you need a BODYGUARD.
...FYI:TETRA is a digital scrambled radio service that runs over (or under, depending on how you look at it) the cellular network. You can even make cell calls to regular mobiles and landlines from the portable terminal gear (usually badged Motorola round here). Yes I understand how they'd not want Jack Bankrobber knowing where the stinger's going to be deployed, but to deny press access to radio traffic, as they do here, smacks of criminals who don't want their communications monitored and possibly publicly aired. But that's just my paranoia talking.
That's what I do. I never use two drives from the same batch in an array*, because a physical fault on one is more likely to be present on another - and that's a guaranteed fail. I think this is why they not only use several different systems to check each other on the Shuttle, they use different //architectures// so a physical flaw that affects one/of a batch/of a series/of a type is less likely to affect the others. I guess it would be like using a Z80, a Motorola 68k and a 80386 to check each other - well blow me, it's old tech, but what fries a 68k a Z80 would most likely survive.
*it's actually rare that I use drives with the same capacity in my arrays! In my current scratch array, built for very high throughput, I have 80GB Hitachi, 80GB Seagate, 120GB Seagate, 160GB Seagate, 200GB Maxtor, in a RAID0 for 400GB. OK there's lots of space wasted, but hey - I built it for throughput not capacity.
no... on military aircraft they use hardcoded RTOS embedded systems. Layers of interfacing and the associated lag can mean the difference between a missile flying through the correct window and blowing an ammo dump or flying through the wrong window and blowing up a school full of kids.
My summary (first time submitter today!) was typed by my very own fingers. No cut/paste involved.
you made me spray coffee!
I think in a **perfect world**, the chances of catastrophic failure in the collective hardware (or relevant to this discussion, the decisionmaking process) of such a system are zero. What I've experienced in terms of hardware is that the chances of an individual component failing does not change the more you add to the system. What does change is that the chances of any single component failing resulting in the total failure of the system is multiplied by the number of similar components in the system.
As an example:
A hard disk has an MTBF of say, 100,000 hours.
You build a RAID array of ten drives. The MTBF of each component drive is still 100,000 hours, but the MTBF of the array (the system) is 100,000/10 or 10,000 hours.
You build an identical array of ten drives and mirror the two to try and mitigate against data loss in case of failure of an array. Here's where the numbers get interesting.
The two arrays have an individual MTBF of 10,000 hours. Taken as a single system their combined MTBF is 5,000 hours. Since the system is composed of two mirrored arrays, all you have done is halve the MTBF (so it's 10,000 hours again), halve the data capacity and double your power consumption.
So every 416 days, you should expect one drive in the 10-disk array or two disks in the 20-disk array to fail.
-
Can I do a lightbulb analogy?
Say a lightbulb has an MTBF of 100 hours. You have an array of 1,000 similar bulbs on a display board. You're replacing a bulb every six minutes.
Be wary of programmers who speak fluent C.
- Me.
Ob. Clancy (mis?)quote:
"See? We have the best technology in our missiles, Tovarisch."
"What does it say?"
"Texas Instruments."
mil spec isn't proofed against hard radiation; it does some soft radiation and EM not quite up to airburst-strength pulse. Space spec has to withstand high energy radiation such as Cosmic, X- and Gamma rays way beyond what you'd encounter 5 miles below a thermonuclear burst, otherwise it'll get outside the VA belts and simply die.
Now you're making shit up.
you're for arming cops, aren't you? I can tell...
...there's no racial profiling going on here at all, no, no...
um... ask?
"Are you a fox?" Sorry, "Are you planting a bomb today?"