BobWeb
Member
In case anyone is big into Mil-Air, I read in the paper that a whole slew of aircraft are leaving for Iraq from Buckley tonight just after midnight. FYI.
Mil-Air Tonight
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BobWeb
Member
SlapShot_84 said:
I don't have an antenna that works for Mil-Air so I can't really listen, although I'd like to. Guess some day I'll have to put one up.
USB FREQ
WHAT ABOUT:
11.175
4.724
6.712
6.739 JUST TO NAME A FEW....ALL USB
WHAT ABOUT:
11.175
4.724
6.712
6.739 JUST TO NAME A FEW....ALL USB
GlacierClipper
Member
Those frequencies are used by Canadian and USA Military.
BobWeb
Member
Re: USB FREQ
I'm not familar with those. What are they? And what is USB?
kg4rgn said:
I'm not familar with those. What are they? And what is USB?
Ultra low side band???
iceman47
Member
The frequencies in the previous are in the High Frequency Bands.
In order to receive these and others, you must have a high frequency receiver such as a shortwave receiver.
To attempt to explain USB transmission.
Upper and lower sidebamds are a product of amplitude modulation as in short wave radio and H.F. Military transmission.
In A.M. transmission you will have a carrier when the transmitter is keyed.
This carrier corresponds to the frequency transmitted.
When the carrier is modulated (voice or code)added, the carrier is modulated and 2 separate sidebands in addition to the carrier are created.
The sidebands will amplify the A.M. signal a maxium of 100%.
Now comes the good part.
The carrier and both sidebands contain the same information being transmitted.
By transmitting only one sideband, we can apply all of the power to that one sideband without waisting it in the carrier and the opposite sideband.
Hence,all of our power goes into the one sideband allowing more efficient transmission.
At the receiver we use a "BEAT FREQUENCY OSCILLATOR OR bfo, to re-insert the carrier so we can demodulate the transmission at the receiver.
In order to receive these and others, you must have a high frequency receiver such as a shortwave receiver.
To attempt to explain USB transmission.
Upper and lower sidebamds are a product of amplitude modulation as in short wave radio and H.F. Military transmission.
In A.M. transmission you will have a carrier when the transmitter is keyed.
This carrier corresponds to the frequency transmitted.
When the carrier is modulated (voice or code)added, the carrier is modulated and 2 separate sidebands in addition to the carrier are created.
The sidebands will amplify the A.M. signal a maxium of 100%.
Now comes the good part.
The carrier and both sidebands contain the same information being transmitted.
By transmitting only one sideband, we can apply all of the power to that one sideband without waisting it in the carrier and the opposite sideband.
Hence,all of our power goes into the one sideband allowing more efficient transmission.
At the receiver we use a "BEAT FREQUENCY OSCILLATOR OR bfo, to re-insert the carrier so we can demodulate the transmission at the receiver.
BobWeb
Member
Cool. Thanks for the explanation.
Believe it or not, something else to listen to would be the Major World Area Routes for civilian aircraft. Popular frequencies on HF, all Upper Sideband:
2.962 5.598 6.628
Listen for aircraft identifying themselves as Reach XXX; those are Military Airlift Aircraft, usually C130's.
2.962 5.598 6.628
Listen for aircraft identifying themselves as Reach XXX; those are Military Airlift Aircraft, usually C130's.
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