Original Fisher Impulse 1985

[Steve Herschbach]

This forum is named the Fisher Impulse Forum and for anybody here that basically means the Fisher Impulse AQ released in 2022. However, the Fisher Impulse name goes back to 1985 and the original Fisher Impulse designed by famed Fisher engineer David Johnson, no doubt with help from others on the team. The Impulse was a very simple pulse induction model with minimal controls and built like a tank, waterproof to 250 feet. It was unique in that it featured a new method that Dave came up with for scavenging the energy wasted in PI flyback to offer a greatly extended battery life.

IMPULSE Deep-seeking, submersible, pulse-induction metal detector with liquid-crystal display, target LED and long battery life 

The IMPULSE is a pulse induction metal detector that offers all the advantages of pulse induction technology -  like increased depth penetration and increased ability to operate in salt water - but eliminates the disadvantages sometimes associated with pulse induction metal detectors. Most P.I. detectors have excessive battery drain and many require constant threshold tuning or operate only in a 'motion' mode. In contrast, the IMPULSE requires no motion, has a stable threshold and gets over 100 hours of use on one set of batteries. The IMPULSE features two visual target indicators: a large liquid crystal display and a light-emitting diode. The VCO audio signal rises in pitch and volume as the search coil nears the target.

• Leakproof to 250 feet
• Saltwater Operation
• Submersible Headset
• LED Target Indicator
• LCD Signal-Strength Meter
• Threshold Operation
• Converts to Hipmount
• VCO No-Motion Search
• VCO No-Motion Pinpointing
• Five-Year Limited Warranty

SPECIFICATIONS
Length Extended - 50"
Length Collapsed - 31"
Weight Complete (with Headset) - 8" Coil 5.2 lbs. / 10.5" Coil 5.5 lbs.
Handle and Search Coil - 8" Coil 2.3 lbs. / 10.5" Coil 2.6 lbs.
Control Housing - 2.4 lbs.
Transmit Frequency - 5,333 pulses per second
Audio Target Response (Headset) - VCO
Visual Target Response- 1. LED 2. LCD Bar Graph
Headset - Waterproof, Piezo Electric, Hard-Wired (Not Interchangeable)
Ground Balance Required - No
Search Motion Required - No
Detachable Control Housing for Hip Mounting - Yes
Salt Water/Fresh Water Operation - Yes
Land Operation - Yes
Submersible - to 250 feet
Search Coil Type - Dual Spider Coil, (Non-Inductive Balance)
Diameter - 8" or 10 1/2"
Shielding - 100% ESI
Interchangeable - No (Hard-Wired)
Batteries - Eight (8) 1.5-Volt, AA penlight
Battery Life Carbon Zinc 40-50 Hours
Battery Life Alkaline 100+ Hours
Battery Life Nicads 2--25 Hours
Automatic Battery Check - Yes
Operating Temperature 32-120°F

                     

[Steve Herschbach]

Key excerpts from Fisher Impulse Owners Manual:

[Tony]

I have only ever seen one of these in action back in the early 90's. The guy using it loved it but I recall him saying something about needing a "third hand".....I guess he meant one hand for the detector, one to hold his scoop and an extra hand to keep the tune control knob tweaked ?

[ivanll]

Thank you Steve.
Lovely to see all the "Fisher Impulse" info in one place.

Now to see and hear it in use, not many videos to find/see on YouTube.

https://www.facebook.com/navi.nesral.1/videos/726673623717048