Digi-Troll IV Manual - Cannon Downriggers

How the Positive Ion Control System WorksThe PIC system uses an internal circuit thatpasses the voltage through the drive train of theDigi-Troll IV to the reel set screw. The set screwcontacts the cable. Care must be taken to ensurecontact between the cable and the set screwwhen replacing the cable.The positive Ion Control system applies avariable 0.2 to 1.2 volts on the trolling cable at alltimes. To adjust the Positive Ion Control, simplyturn the PIC knob on the back of the Digi-Troll IVhousing.Measuring the Natural Electrolysis and PICVoltage on Your BoatA voltmeter with a scale of zero to one volt willmeasure the natural electrolysis. Place the groundlead of the meter on the motor or the batteryground. Place the positive lead on the stainlesssteel downrigger cable while it is in the water. Thedownrigger must be unplugged. The voltage youmeasure on the volt meter is your boat's naturalelectrolysis voltage. Use the same set up tomeasure the PIC voltage; just plug in the Digi-TrollIV and adjust the PIC knob to the voltage desired.Using Positive Ion ControlPositive Ion Control is very effective whentrolling. The zone of attraction created at thedownrigger wire will attract the fish. It is best touse a short drop back between the downriggerrelease and the lure. Drop backs of 10 to 20 ft. aretypical. A drop back of 50 to 100 ft. will entirelynegate the effects of the PIC circuit. Fishingdepths greater than 125 ft. may require a slightlyhigher PIC voltage. If you return to shallow waterfishing remember to turn the PIC voltage downagain.The correct PIC setting for your best fishingadvantage varies, depending on fish type andlocation. For example, the proper setting for PugetSound Steelhead may not be effective for GreatLakes Steelhead. To fully benefit from PICtechnology, it is important that you experimentwith the PIC setting to find the proper voltage forthe gamefish in your area. For more informationon this subject, refer to "Secrets of Fishing withElectricity" by Ollie Rode.Maintaining Your DownriggerPeriodically, lightly grease the thrust bearingand bearing race found behind the clutch knob.Replace the cable at least every two years.There are no other user serviceable parts onthe Digi-Troll IV. Your warranty will be void ifthe seal on your unit is broken. For repairs orservicing your downrigger refer to theWarranty Information section of this booklet.POSITIVE ION CONTROL & maintaining19