Interferance from electronic signs

[KD0DWV]

I have a Yaesu ft-2800 mounted in my truck with a 5/8th wave antenna mounted to the roof with a NMO style mount. The radio is wired directly to the battery with fuses on both negetive and positive sides. My problem is within the last 4 months everytime I drive by a store that have a electronic readerboard my radio goes nuts with static ever with the squelch turned all the was up. I took the antenna off and check the contacts and they seemed fine the contact was nice and shinny and also wipes the entire antenna down and re-installed it. I checked the connector on the radio and all seemed fine their to. What would cause this

 

[KB7MIB]

Wirelessly posted (Mozilla/5.0 (X11; Linux i686; U; en-US) Gecko/20081217 Vision-Browser/8.1 301x200 LG VN530)

That sign is an RFI source. If the RFI is bad enough, and especially if it affects public safety frequencies, the FCC can and should force the business to remove it for that very reason.

 

[ridgescan]

Those signs and neons and the like actually spew that much RFI! Nothing to do with your setup. Take a pocket radio and walk near that sign and your little radio's speaker will almost pop out from the powerful RFI.

 

[nd5y]

There is nothing you can do to your radio or antenna to prevent interference that comes from somebody else's electronic device.
Your only options are to complain to the ower or operator of the equipment or the FCC. Unless they are also interfering with aviation, marine or public safety frequencies the FCC is not likely to do anything.

 

[cavmedic]

Every single one of those LED signs I've driven past destroy 146.580 for about 1/4 mile in either direction on my dual band ham rig. Along with quite a few commercial alarm systems, some store front security devices, and a TON of electrical interference from LED billboards, BUT there is no interference to my dual band commercial Kenwood radio nor my 800mhz Motorola from any of them.

Even the frequencies in my commercial rig without PL's aren't affected.
Most of it has to do with the poor filtering and broad range of receive in the newer Ham rigs.