That portion of the ionosphere existing between approximately 160 and 400 km above the surface of the Earth, consisting of layers of increased free-electron density caused by the ionizing effect of solar radiation. Note 1: The F region reflects normal-incident frequencies at or below the critical frequency (approximately 10 MHz) and partially absorbs waves of higher frequency. Note 2: The F1 layer exists from about 160 to 250 km above the surface of the Earth and only during daylight hours. Though fairly regular in its characteristics, it is not observable everywhere or on all days. The principal reflecting layer during the summer for paths of 2,000 to 3,500 km is the F1 layer. The F1 layer has approximately 5 ´ 105 e/cm3 (free electrons per cubic centimeter) at noontime and minimum sunspot activity, and increases to roughly 2 ´ 106 e/cm3 during maximum sunspot activity. The density falls off to below 104 e/cm3 at night. Note 3: The F1 layer merges into the F2 layer at night. Note 4: The F2 layer exists from about 250 to 400 km above the surface of the Earth. The F2 layer is the principal reflecting layer for HF communications during both day and night. The horizon-limited distance for one-hop F2 propagation is usually around 4,000 km. The F2 layer has about 106 e/cm3. However, variations are usually large, irregular, and particularly pronounced during magnetic storms.
by IRISHrepublicanARMY January 03, 2004
1) The process of comparing an instrument's output signal with reality. Instruments that measure solar energy tend to "drift", that is, their output signals do not mean the same thing from one time period to another. Because of this, they are periodically (annually or semi-annually) re-calibrated against more reliable instruments.
2) Adjusting a measuring instrument to make it accurate. The set of operations which establish, under specified conditions, the relationship between values indicated by a measuring instrument or measuring system and the corresponding values of a quantity realized by a reference standard.
3) The act of adjusting the color of one device relative to another, such as a monitor to a printer, or a scanner to a film recorder. Or, it may be the process of adjusting the color of one device to some established standard.
2) Adjusting a measuring instrument to make it accurate. The set of operations which establish, under specified conditions, the relationship between values indicated by a measuring instrument or measuring system and the corresponding values of a quantity realized by a reference standard.
3) The act of adjusting the color of one device relative to another, such as a monitor to a printer, or a scanner to a film recorder. Or, it may be the process of adjusting the color of one device to some established standard.
by IrishRepublicanArmy December 26, 2003
The range of radio frequencies that are assigned to police departments:
and here they are:
the police bands are shared with fire/public safety bands in the 44.62 to 46.02 MHz band, the 153.74 to 156.24 MHz band, and the 453, 460, and 851.0125 to 868.9875 MHz band. Specific police allocations very from city to city and the UHF-T band, 470 to 512 MHz is also used in large cities such as LA, New York and others.
VHF:
037.0200 to 037.4200 MHz
037.9000 to 037.9800 MHz
039.0200 to 039.9800 MHz
042.0200 to 042.9400 MHz
044.6200 to 046.0200 MHz
153.7400 to 156.2400 MHz
158.7300 to 159.2100 MHz
UHF:
453.0000 to 453.9875 MHz
460.0000 to 460.4375 MHz
851.0125 to 868.9875 MHz
and here they are:
the police bands are shared with fire/public safety bands in the 44.62 to 46.02 MHz band, the 153.74 to 156.24 MHz band, and the 453, 460, and 851.0125 to 868.9875 MHz band. Specific police allocations very from city to city and the UHF-T band, 470 to 512 MHz is also used in large cities such as LA, New York and others.
VHF:
037.0200 to 037.4200 MHz
037.9000 to 037.9800 MHz
039.0200 to 039.9800 MHz
042.0200 to 042.9400 MHz
044.6200 to 046.0200 MHz
153.7400 to 156.2400 MHz
158.7300 to 159.2100 MHz
UHF:
453.0000 to 453.9875 MHz
460.0000 to 460.4375 MHz
851.0125 to 868.9875 MHz
by IrishRepublicanArmy November 07, 2003
Lucky Charms would be the breakfast of champions..
by IrishRepublicanArmy May 27, 2004
Pilot slang for the transponder code being used to indentify the aircraft on radar. The code is made up of four digits, and all codes are used but 0000, try using that code in a civilian aircraft and watch how fast the air force lights your ass up. For normal flight the code is 1200, Hijack code is 7500, radio being jammed is 7600 and general mayday call is 7700. These are discrete codes from 7600 to 7677 and 7701 to 7785 also, but I cant tell you what they are for...
Jetblue 834 this is Dulles Control, squawk 4932 please and climb to 15000.
Roger dulles control, squawking.
Roger dulles control, squawking.
by IrishRepublicanArmy October 13, 2003
by IrishRepublicanArmy November 16, 2003
One of the members of the human race that has high intellengence, poor spelling and handwriting, pilots have good looks, and all the hot girls want them.
so HA!
so HA!
by IrishRepublicanArmy November 22, 2003