Triplett Fox 2 & Hound 3 – PN: 3399 - Manual (Page 33)

33
When the FOX 2 is initially set to the TRACER TONE mode, it
may come on with either fast or slow cadence.
8.1.8.2: 60Hz Noise and Pulse Tone:
Although the FOX 2 is not affected by 60Hz Noise, the HOUND
3 will pickup and amplify the noise. It usually sounds like a
humming or buzzing sound coming from the speaker of the
receiver. The noise is usually at its worst around fluorescent
lights. The HOUND 3 contains a filter to suppress the basic
60Hz noise, but the 60Hz harmonics can still be strong
enough to cause noise in the speaker.
The HOUND 3 has a signal strength indicator LED that aids
in finding the FOX 2 tone in areas where the background
acoustic noise level is so high that the speaker cannot be
heard. When the speaker cannot be heard, the HOUND 3’s
visual signal strength LED aids in finding the tracer tone.
The HOUND 3’s LED lights more brightly as the HOUND 2
nears a signal source. Unfortunately, the HOUND 3, cannot
differentiate between a 60Hz Noise source and the actual
tracer tone. The FOX and most other tone generators gener-
ate a continuous or warble tracer tone. Unfortunately, the
LED indicator on the HOUND 3, and most other receivers,
cannot tell the difference between such tones and 60Hz Noise.
Both signals cause the LED to light continuously. Conse-
quently, when the user is unable to hear the speaker, he is
not certain whether the LED is indicating 60Hz Noise or ac-
tual tracer tone. In addition to a continuous tone and a warble
tone, the FOX 2 can generate a Pulse tone. Instead of simply
lighting the LED on the HOUND 3, the Pulse tone causes the