On 11/16/06 1:16 PM, in article Vy47h.320898$1T2.140009@pd7urf2no, "Ken
Weitzel" wrote:

Bob Urz wrote:
Anybody got a good resource on how to build a phone line filter?
I am near a AM radio tower and its really killing my dial up modem
at times. I tried a DSL filter in line. but i think the AM band is
not getting attenuated enough to do much good.

Its hard to peg characteristics. Would a modem be considered a 200 ohm
nominal load on the phone line?

What type of filter for AM radio?

Dual inline inductors?
parallel capacitor with series resistor maybe?

Any ideas or links?

Hi Bob...

Spent my working lifetime in broadcast, so can virtually guarantee
that you don't have to do a thing

Just call the station, ask for the Chief Engineer, and tell him of
your problem.

If your country is anything like Canada, he'll be there in a flash,
and all of your problems will be gone

If you want him there even faster'n a flash, just ask him if
you're supposed to be telling him about the problem, or should
it be the DOT/FCC/whatever country you're in

That's bad advice.

Take care.

Ken


Just exactly why you think the radio station or FCC is going to care about
RF getting into the premises wiring or telephone cable? The station
engineer may make a filter recommendation, but is under no obligation to do
any more than that.

The issue is... What non-linear device is causing the RF to be rectified so
it is audible. It could be a bad joint, a telephone, or whatever..

Don