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Radio Broadcast Technical Consulting and Sales
 10032 Island Drive, Brainerd, MN  56401

 

Technical Tips from Mark W. Persons

Standards...Standards...How would we get along without them?
FM Composite Audio: 
For older Harris FM exciters such as the MS-15, the MX-15, and THE-1, 2.828 Volts Peak to Peak/1.0 Volts RMS will result in 100% modulation.
For Moseley STL systems, Broadcast Electronics FM Exciters, Bext, and newer Harris FM exciters, 3.5 Volts Peak to Peak/1.237 Volts RMS will give 100% modulation.
Audio Wire Color Coding on 2-pair shielded cable:
Green = left +
White = left -
Red = right +
Black = right -
XLR-3 (A3M or A3F) Connector Audio: 
Pin 1 = Shield
Pin 2 = Audio +
Pin 3 = Audio -

Air arc-gap spacing for 1000 watts/50 ohms:  .030"  Details
For air variable capacitors, .045" plate spacing = 2kV rating  .075" plate spacing = 3kV rating  .080" plate spacing = 3.5 KV  .125" plate spacing = 4.5 kV rating.

The stories go on and on.  Stop in again sometime.  I'll leave the soldering iron on for you. 
Mark W. Persons   Ham WØMH

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page last edited 02/19/2010