Technical Details:

Radio Waves

The electronic choker system operates at a frequency of 72 to 76 Mhz and each choker bell is computer controlled.  Transmitter range varies depending on the environment and is typically between 100 to 200 feet, but will operate as far as 1000 feet, as the steel cables on the Yarder machine act as an antenna. The transmitter operates on either +/-12 or +/-24 volt DC power.

Battery life for an individual choker bell depends on the amount of usage, and speed of the yarder.  With our new choker bell design some customers have been replacing batteries in 3 month intervals.  The current draw of the new choker bell is the lowest ever, and we have tested the average battery life to be at least 1.5 to 2 months.

Johnson Industries Ltd.  -  6500 Dennett Place - Delta, B.C. - Canada - V4G 1N4 - Tel.:(604) 940 4555 - Fax.:(604) 940 4565
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