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ALWAYS use a quality standing wave meter or
antenna analyzer to check the
final installed system!
 

 

VHF 5/8 Wave Cutting Chart (3db)

Frequency MHz

 Whip Length Inches
 143  49 1/2
 145  48 3/4
 147  47 5/8
 149  46 7/8
 151  45 15/16
 153  45 1/16
 155  44 3/16
 157  43 5/16
 159  42 5/8
 161  42
 163  41 7/16
 165  40 9/16
 167  39 3/4
 169  39
 171  38 3/16
 173  37 3/8

 

 

1DB UNITY GAIN MAGNET MOUNT  
 

Frequency MHz Whip Length Inches
 136  20.47
 137  20.35 
 138  20.28
 139  20.08 
 140  19.88
 142  19.61
 144  19.29 
 146  19.17
 148  19.06
 150  18.90
 152  18.78 
 154  18.66 
 156  18.43
 158  18.11
 160  17.72
 162  17.52 
 164  17.17
 166  16.93 
 168  16.73
 170  16.46 
 172  16.26 
 174  16.06 

 

 

VHF / UHF 1/4 Wave Rough Cutting Chart

 Frequency MHz    

  Whip Length      Inches 
 136-144  20   1/2
 144-150  19   3/16
 150-160  18
 160-170  16   15/16
 400  6      5/8   
 410  6      1/2
 420  6      3/8
 430  6      5/16
 440  6
 450  5     13/16
 460  5     11/16
 470  5       9/16
 480  5       7/16
 490  5      5/16
 500  5      1/8
 510  5      1/16
 800-900  2      3/4
 870-940  2      7/16

 

 

VHF 1/2 Wave Cutting Chart -  No Ground Plane (2db)

Frequency MHz

 Whip Length Inches
 132  49 7/16
 134  47 5/8 
 136  46 1/4
 138  44 7/8 
 140  44
 142  43 1/8
 144  42 1/2 
 146  42
 148  41 1/8
 150  39 15/16
 152  38 13/16 
 154  37 11/16 
 156  36 9/16
 158  35 3/4
 160  34 13/16
 162  34 1/4 
 164  33 9/16
 166  32 7/8 
 168  32
 170  31 5/16 
 172  30 9/16 
 174  29 15/16 

 
 
 
 
 
 
 
 
 
 

 

Send mail to jim@b-kelectric.com with questions or comments about this web site.
Copyright © 2013 Fire Electronics division of B-K Electric, Inc.
Last modified: 10/06/12

IMPORTANT NOTICE:  It is imperative that public safety communications users NOT schedule any emergency incidents (fires, manhunts, floods, earthquakes, etc.) that require faster than a three-day response to allow for deferred planning, distribution of communications equipment, and training to be accomplished.  In some jurisdictions a local ordinance will be required to prevent unplanned emergencies.