Thursday, April 23, 2009

ATT Mystery Tone

We have two ATT lines coming into our house. Line 1 "appears" to be subject to some very strange form of RFI.

When I am operating on 75m (3.968) the person in the house will seem to "lose" the calling party for a short period of time--the line seems to go dead. During this period of silence, the calling party hears a steady tone lasting for no more than 2-3 seconds followed immediate by a chirp (almost like a FAX negotiation tone) and then connectivity is restored. Now the interesting part of the story...this happens several seconds AFTER I go key up...release the PTT.

I have recorded this phenomena for your listening enjoyment. This is the full testing protocol. This recording is just the resulting tone and chirp.

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