The 640 model has a length of 9 cm.
- Trill tone = variable frequency from 3150–3500 Hz
- Clear whistle tone = 4000 Hz
How to Use the Acme Double-Tone Whistle 640
This whistle is designed for dog training and hunting work. It combines two different sound signals:
- Trill whistle – a vibrating, variable tone (3150–3500 Hz)
- Clear whistle tone – a sharp, consistent signal (4000 Hz)
This allows the dog to distinguish different commands more easily, even at long distances or in windy conditions.
Recommended Use
🔸 Clear whistle tone
Usually used for:
- recall,
- the “come” command,
- getting the dog’s attention at a distance.
It is important to always use the same signal consistently, for example:
- one long whistle = come back to the handler.
🔸 Trill whistle
Commonly used for:
- changing direction,
- correcting the dog during work,
- maintaining attention during search work,
- repeating commands in difficult conditions.
Important in Dog Training
- The whistle itself is not a command — the dog must first learn to associate each sound with a specific action.
- Always use the same signal for the same command.
- Begin training in a quiet environment and at short distances.
- Only later move to forests, fields, or hunting situations.
- One of the biggest advantages of a whistle is that the tone remains consistent regardless of the handler’s emotions or voice fatigue.
Why Hunters Use a Whistle
- The sound carries farther than the human voice.
- Dogs react more reliably to familiar whistle signals under stress.
- No need to shout in the forest or during driven hunts.
- Less emotional pressure compared to yelling.
Especially popular for working with bird dogs, spaniels, retrievers, and blood tracking dogs.
