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Re: Maybe ? not so dumb a question

PostPosted: Mon Aug 07, 2017 6:17 pm
by G4RMT
My SDR screen is awash with huge signals on 153-155MHz that don't even need the antenna connecting. These things bet together and produce these nasty spikes that seem to cross into the marine band - but they're not really there. A marine band radio on these channels with squelch open hears nothing at all - the SDR hears a nasty digital mush. Just a by product of a wide open sensitive wide band receiver.

Re: Maybe ? not so dumb a question

PostPosted: Sun Oct 15, 2017 11:28 am
by Richie_asg1
You could try a Yagi antenna cut for 154 Mhz and see if the noise is directional. Then drive to somewhere else and direction find it on a map.

It may only be smush but it will be smush from one location.

I was parked in a Scout Hut car park and tried listening to AM for a bit, but all I could get was a loud buzz on most stations. I put it down to a 3 phase 400KV power line that pops up from an underground cable near there, and sure enough driving past it I get a peak. Most likely your is the hospital - maybe even their Xray department :shocker: