Maybe ? not so dumb a question

Everything Ham Radio in here, Frequencies, Equipment, Repairs, Mods, Licensing and More

Re: Maybe ? not so dumb a question

Postby G4RMT » Mon Aug 07, 2017 6:17 pm

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.
Posts: 1411
Joined: Sat Feb 07, 2015 5:45 pm

Re: Maybe ? not so dumb a question

Postby Richie_asg1 » Sun Oct 15, 2017 11:28 am

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:
User avatar
Posts: 24
Joined: Mon Oct 09, 2017 3:22 pm


Return to Amateur Radio

Who is online

Users browsing this forum: No registered users and 1 guest