The VOX is normally closed. When you start speaking in opens (after a pause), then closes again when you stop talking.
> I think these days they should build a buffer circuit, and make everything delay for a few milliseconds, detect the voice, so the operators don't need to say "Ah".
How would that help? Noise would still trigger the buffer circuit.
The missing "A" was not caused by static, but by the way that the VOX (Voice Operated Switch) operated.
The Sensitivity of the VOX is quite critical. If it's too sensitive, everybody gets to hear background noises like breaths and grunts. To work properly the VOX needs to be set quite "tight". If you listen to any of the recordings you can hear how the first syllable is always clipped. If the first word is a short sound, it will likely be cut completely.
In noisy conditions, most operators develop the habit of starting a sentence with a short "Ah". The "Ah" isn't transmitted, it just serves to open the mute. Ask any Ham Radio Operator about setting up a VOX.
In the USA the Unions are demonised and consequently they do not have a constructive role in society.
In Europe Unions are generally respected and work together with Employer's to improved both Productivity and Working Conditions.
One key point is your definition of "Productivity": In America, improved productivity means more money for the super-rich. In Europe it means a better return for the whole of society.
The problem is threefold.
- These Social programs are under-funded because the taxes and contributions which were originally put aside have been stolen by Congress.
- Medicare/Medicaid is being used as a cash-cow by big business. It needs to be community operated on a non-profit basis as it is in other countries.
- Insufficient taxes are raised to pay for these essential services and the rich are allowed to opt out.
Probably because your old Blackberry was 2G (eg GSM) and your newer phones are 3G (eg W-CDMA)
GSM is heavily amplitude modulated, whilst W-CDMA is a constant amplitude signal.
If an amplifier (or whatever) responds to a phone signal, the fault is with the device, not with the phone. There is nothing the GSM designer can to to reduce the problem (except reduce the power, which would make the phone unusable).
And if it did, it would be a design flaw in the Pilots headphone/intercom circuit, and not with the passengers phone.
Anything fitted to commercial aircraft is supposed to be exhaustively tested for EMC/EMI. An intercom which is so badly designed that it responds to a low level cell phone signal should never have been approved for installation in a commercial airliner.
It depends on so many things. Most importantly the relative strength of the Interfering signal compared to the wanted signal, but ultimately it depends on how well engineered the TV is in its ability to reject unwanted signals. Most TV's are woeful in this respect.
Slashdot Mirror
> So what VOX switched off before he said "a"?
The VOX in the astronauts suit transmitter
> So what VOX switched off before he said "a"?
The VOX is normally closed. When you start speaking in opens (after a pause), then closes again when you stop talking.
> I think these days they should build a buffer circuit, and make everything delay for a few milliseconds, detect the voice, so the operators don't need to say "Ah".
How would that help? Noise would still trigger the buffer circuit.
Engage brain before putting mouth in gear.
The missing "A" was not caused by static, but by the way that the VOX (Voice Operated Switch) operated.
The Sensitivity of the VOX is quite critical. If it's too sensitive, everybody gets to hear background noises like breaths and grunts. To work properly the VOX needs to be set quite "tight". If you listen to any of the recordings you can hear how the first syllable is always clipped. If the first word is a short sound, it will likely be cut completely.
In noisy conditions, most operators develop the habit of starting a sentence with a short "Ah". The "Ah" isn't transmitted, it just serves to open the mute.
Ask any Ham Radio Operator about setting up a VOX.
In the USA the Unions are demonised and consequently they do not have a constructive role in society.
In Europe Unions are generally respected and work together with Employer's to improved both Productivity and Working Conditions.
One key point is your definition of "Productivity": In America, improved productivity means more money for the super-rich. In Europe it means a better return for the whole of society.
You reap what you sow......
> How do we get them to contribute something positive to society,
In a Democracy it should be up to the people to choose whether they to work hard or coast and enjoy their family, hobbies, etc.
This is a test of whether you really believe in democracy and the free market. Clearly you don't.
> length/surface area for an antenna comes in a very small package these days
And they are relatively inefficient compared to a full sized antenna.
The laws of physics still apply...
I know what Harmonics are I know what Resonance is, but I don't understand the term "Harmonic Resonance".
I'll bet that you don't either.
Likewise the term "resonating and amplifying". Resonance doesn't Amplify. Only Amplifiers Amplify.
You come across as just another Tesla fan boy. Scientifically Illiterate.
Absolute crap.
The problem is threefold.
- These Social programs are under-funded because the taxes and contributions which were originally put aside have been stolen by Congress.
- Medicare/Medicaid is being used as a cash-cow by big business. It needs to be community operated on a non-profit basis as it is in other countries.
- Insufficient taxes are raised to pay for these essential services and the rich are allowed to opt out.
The air/water machine extracts water vapour via thermal methods (eg condensation).
There are of course other ways of collecting water if it is in droplet form (eg mist)
see http://en.wikipedia.org/wiki/Fog_collection or google on "fog fence"
This latter method seems to be pretty much what the beetles are doing
Wasting my breath I know...
but machines which extract water from air have been around for a long time.
Even a humble air-conditioner does this (albeit rather inefficiently)
Google on "Air Water Machine"
By using terms such as "culprit", "idiot", and "turkey" you indicate that you are a big part of the problem.
Only gross mismanagement would let you get into such a mess in the first place.
It sounds like he is well rid of you.
And the iPhone is different just how?
There are well documented hacks and interfaces for the iPhone USB, Audio and Serial ports.
Pretty much like any other computer.
It's good to see people doing stuff, but this article is a decade or two out of date.
Hams have been hooking computers to radios for a long, long time.
There are hundreds of pages on digital radio and sound card interfacing:
try
http://en.wikipedia.org/wiki/PSK31
http://hfradio.org.uk/html/digital_modes.html
http://www.tapr.org/packetradio.html
http://www.dxzone.com/catalog/Technical_Reference/Sound_Card_Radio_Interfacing/
Probably because your old Blackberry was 2G (eg GSM) and your newer phones are 3G (eg W-CDMA)
GSM is heavily amplitude modulated, whilst W-CDMA is a constant amplitude signal.
If an amplifier (or whatever) responds to a phone signal, the fault is with the device, not with the phone.
There is nothing the GSM designer can to to reduce the problem (except reduce the power, which would make the phone unusable).
And if it did, it would be a design flaw in the Pilots headphone/intercom circuit, and not with the passengers phone.
Anything fitted to commercial aircraft is supposed to be exhaustively tested for EMC/EMI.
An intercom which is so badly designed that it responds to a low level cell phone signal should never have been approved for installation in a commercial airliner.
> Either it does or it doesn't
Utter rubbish.
It depends on so many things. Most importantly the relative strength of the Interfering signal compared to the wanted signal, but ultimately it depends on how well engineered the TV is in its ability to reject unwanted signals. Most TV's are woeful in this respect.
Groan,
A serial bus can be more than one bit wide, but never mind....
Future, wide bandwidth applications will used fibre optics, not wireless
That's the whole point: There aren't any free frequencies left. White Space technology is an attempt to squeeze the last drop.
FWIW, Water from Air machines have been available for decades
here's one http://www.islandsky.com/
Just add wind generator
Yes please !!!!!
The Kindle is great, but for some reason it needs a really bright light to read with in bed.
I think he posted the wrong link.
Perhaps he meant this one
"$20 ultra-cheap Software Defined Radio with RTL2832 DVB-T USB stick"
at http://www.youtube.com/watch?v=Z0hEquzLsWU
The original article is at
http://sdr.osmocom.org/trac/wiki/rtl-sdr
Are you aware of the more than 70 Amateur-Radio Satellites which have been launched since 1961?
see http://www.spacetoday.org/Satellites/Hamsats/HamsatsBasics.html
> Last I checked they used 2.5, 5, 10, 15, and 20 MHz to get the WWVB Time signal.
You should check again.
WWVB is on 60KHz and is a completely different service to WWV.
Lines on the map like some of these pictures are very common in outback Australia.
In our case they are survey tracks cut by trucks carrying out oil and mineral surveys.