F
felix
Guest
Recent posts about dogs emitting RF reminded me of something that happened
to me almost 40 years ago. I was a newly hired telephone installer. It was
my first real job, and I thought I was a lot smarter than I really was.
I was given a trouble report, which stated that the woman's dog barked
excitedly whenever the phone rang. I immediately concluded that since dogs
can hear much higher frequencies than people, the dog was just reacting to
ultrasonic frequencies that came from the ringing bell.
I arrived at the house, and immediately changed the phone, thinking that her
old phone had some odd problem with the small brass bells inside. I dialed
the "ring back" number, and as soon as the phone rang, the dog barked, and
ran back and forth yelping outside the window.
After almost an hour of investigating, I found the problem. The installer
who originally installed the phone had ran the ground wire outside and
grounded it to a metal clothes line pole. The pole was set in concrete (not
a good conductor) and since the dog was attached with a metal chain to the
metal clothes lines, so it could move back and forth across the yard without
escaping, the ringing voltage (about 90 ac, as I recall) went from the
phone, to the pole, to the clothes line wires, and down the chain to the
hapless dog.
As I think back on it, the poor dog was (a la Pavlov) probably conditioned
to fear telephone ringing...
to me almost 40 years ago. I was a newly hired telephone installer. It was
my first real job, and I thought I was a lot smarter than I really was.
I was given a trouble report, which stated that the woman's dog barked
excitedly whenever the phone rang. I immediately concluded that since dogs
can hear much higher frequencies than people, the dog was just reacting to
ultrasonic frequencies that came from the ringing bell.
I arrived at the house, and immediately changed the phone, thinking that her
old phone had some odd problem with the small brass bells inside. I dialed
the "ring back" number, and as soon as the phone rang, the dog barked, and
ran back and forth yelping outside the window.
After almost an hour of investigating, I found the problem. The installer
who originally installed the phone had ran the ground wire outside and
grounded it to a metal clothes line pole. The pole was set in concrete (not
a good conductor) and since the dog was attached with a metal chain to the
metal clothes lines, so it could move back and forth across the yard without
escaping, the ringing voltage (about 90 ac, as I recall) went from the
phone, to the pole, to the clothes line wires, and down the chain to the
hapless dog.
As I think back on it, the poor dog was (a la Pavlov) probably conditioned
to fear telephone ringing...