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Hans Wedemeyer's proposal for batching pig detection:

Today when batching pigs need to be identified it is common practice to use a 22Hz pinger transmitter adjusted to emit different codes.

The unique code is then identified by the person tracking the batching pig. Sound OK... however there is a better way to identify batching pigs.

I have developed a tunable ELF (10 Hz to 30Hz ) receiver which also has adjustable bandwidth, and if used with transmitters on different frequencies it is possible to clearly discriminate between batching pigs.

Example: For Batch Pig #1 use a Transmitter adjusted to transmit 15Hz signal, either continuous or in pinger mode.

For Batch Pig #2 use a Transmitter adjusted to transmit 20Hz signal, either continuous or in pinger mode.

Above the ground the person tracking these two batching pigs will have two of my ELF receivers. One tuned to 15Hz and the other to 20Hz.

The receiver tuned to 15Hz will ONLY react (raise an alarm) to the 15Hz batching pig, and likewise the receiver tuned to 20Hz will only react (raise an alarm) to the 20Hz batch pig.

My system clearly and unambiguously identifies which batching pig has passed..

My ELF receiver is user tunable, simply dial in the required frequency, which allows the user to tune the ELF receiver in seconds, and it may be possible to use one receiver to identify both batch pigs.

Here is a small graphic to help describe the system:

With my system there is NO CODING.

No need to display and identify which coded batch pig just came by.

No possibility of operator misinterpreting the code !