Hello all. I'm hoping someone can help me track down a new source of noise we're hearing on the input to our local 2m repeater at 147.990MHz.
Here's a couple short videos of what it sounds like while driving around the area listening on the input of the repeater. I used AM mode to enhance the noise a bit, but it can be heard under the signal of our weaker FM users on the repeater.
A few of the characteristics:
- Started around Jan 1, 2021, and wasn't a problem before that
- Broadband, I can hear it from about 138MHz to about 150MHz from my QTH
- Strong - I can hear this clearly from 5 miles on north and west of the repeater
- Has a semi-random pattern of pulses, and pauses for nearly a minute sometimes (see video links above to hear the noise)
- Is either on or off - doesn't seem to fade up or down in strength
- I did a little foxhunting, and the noise doesn't seem to be coming from one particular source, but is directional
Some of the theories we have are a local cable TV system leaking, one of the 345KV power lines in the area, an electric fence, lighting/signage etc.
That noise sound familiar to anyone?
Thanks
? - John, N8CD
