Got an Uniden Madison with a busted Sig/TX pwr. Used a Cobra 139 meter as a substitute but when I adjust VR1 for a 9lbs reading with 100uV, dead dignal reads as high as a 6. If I jump the meter terminals with resistance, it's either the same result or I allow too much pwr to bypass the meter. Does anyone know how to get this meter to cooperate?