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glossary:glossary_f [2018/09/27 08:53] Bob Vetterleinglossary:glossary_f [2021/08/08 04:42] (current) – Moved FM so it was in alphabetical order Wayne
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 Manufacture Model Railway accessories and buildings. Faller road system MERG TBA36/1&/2 - merg members only Manufacture Model Railway accessories and buildings. Faller road system MERG TBA36/1&/2 - merg members only
  
 +===== FallerCarSystem ===== 
 +Batter powered H0 vehicles with a steering rack fitted with a small magnet. The vehicle follows an iron wire hidden in the roadway.
 ===== Fast clock ===== ===== Fast clock =====
  
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 ===== Firmware ===== ===== Firmware =====
 A computer program that is held in non-volatile memory such as EPROM or flash memory. A PIC processor has a small amount of RAM used for variables and a much larger flash memory for program. A computer program that is held in non-volatile memory such as EPROM or flash memory. A PIC processor has a small amount of RAM used for variables and a much larger flash memory for program.
 +
 +=====Flag=====
 +A 'Flag' is a single [[glossary_b#bit|'Bit']] of information that can either be 'True', 'On', 'Set' (1) or 'False', 'Off', 'Clear' (0). Flags most often are in sets of 8 [[glossary_b#byte|(a Byte)]] but not always.
 +As an example, in the CANACC8, one of the first [[glossary:glossary_c#cbus|CBUS]] modules, each learnt event has two EVs (Event Variables), these are actually 'Flag Bytes' and each 'Bit' is directly associated with one of the outputs. In the first byte if a 'Bit' or 'Flag' is set (1) then that event acts on the corresponding output, an ON event will switch the output on, an OFF event will turn it off. The second byte contains the 'Polarity Flags' these only have meaning if the matching flag in the first byte is set and have the effect of inverting the action performed on the output. So if say bits 0 & 1 are set in the first byte and bit 1 is set in the second the result will be that an On event will switch output 1 on and output 2 off.
 +
 +===== Flash Memory =====
 +
 +[[wp>/Flash_memory|Flash Memory]] is an electronic (solid-state) non-volatile computer storage medium that can be electrically erased and reprogrammed.
  
 ===== FLiM ===== ===== FLiM =====
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 [[wp>Flip-flop_(electronics)|Flip-flop (electronics)]] [[wp>Flip-flop_(electronics)|Flip-flop (electronics)]]
  
 +===== FM =====
 +
 +Frequency Modulation. The process of varying the carrier frequency with the modulation frequency thus enabling the signal to have a constant amplitude, mainly used at Very High Frequencies 90-110MHz broadcasts, this enables verygood noise control. More complex than AM as it requires a special demodulator to obtain the information.
  
 ===== Frequency ===== ===== Frequency =====
- 
  
 Frequency is the measurement of the number of times that a repeated event occurs per unit of time.     \\ [[wp>Frequency]] Frequency is the measurement of the number of times that a repeated event occurs per unit of time.     \\ [[wp>Frequency]]
- 
- 
-===== FM ===== 
- 
- 
-Frequency Modulation. The process of varying the carrier frequency with the modulation frequency thus enabling the signal to have a constant amplitude, mainly used at Very High Frequencies 90-110MHz broadcasts, this enables verygood noise control. More complex than AM as it requires a special demodulator to obtain the information. 
- 
  
 ===== Fuse ===== ===== Fuse =====
- 
  
 This a protection device to protect power supplies, cabling and devices from the effects of excessive current. Typically a short length of wire can carry the rated current indefinitely, but melts (blows) when the current exceeds the rating. A quick blow fuse will blow in a short time after the rating is exceeded and is used to protect sensitive components like semiconductors. A slow blow fuse can carry excess current for a considerable period (50% excess for half an hour is common) and is commonly used to protect cables- the fuse in a UK power plug is normally of this type. This a protection device to protect power supplies, cabling and devices from the effects of excessive current. Typically a short length of wire can carry the rated current indefinitely, but melts (blows) when the current exceeds the rating. A quick blow fuse will blow in a short time after the rating is exceeded and is used to protect sensitive components like semiconductors. A slow blow fuse can carry excess current for a considerable period (50% excess for half an hour is common) and is commonly used to protect cables- the fuse in a UK power plug is normally of this type.
  
  
glossary/glossary_f.1538038424.txt.gz · Last modified: 2018/09/27 08:53 by Bob Vetterlein

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