It's very simple: the DC generated by the solar cells needs to be converted to AC so that the energy can be distributed. Modern systems use high frequency inverters to do the job which create a lot of noise. The majority of suppliers only do a minimal filtering. I have one major system about 16m away from my antenna at the roof of my neighbour's barn, 2 systems about 300 m away, more than 30 additional systems in a circle of about 5 km with one system with solar cells completely covering 10,000 sqm (100,000 square feet). I could see and - unfortunately - hear the development within the last 12 months ... (the satellite picture in Google Maps doesn't show this yet for my qth).
73 Juergen, DL8LE --- In digitalradio@yahoogroups.com, "Jeff Moore" <tnetcen...@...> wrote: > > Please explain your comment! It's the first I've ever heard of PV systems > being RF noisey - this could be a major problem with the push for green > technologies! > > 73, > > Jeff -- KE7ACY > CN94 > > ----- Original Message ----- From: Juergen > > > Don't forget the photovoltaic systems which are becoming very popular now > because of financial benefits (at least in Germany). Nice rural areas with a > very low level of noise will be more and more very noisy. > > 73 > > Juergen, DL8LE > > --- In digitalradio@yahoogroups.com, "cq_k7ng" <cq_k7ng@> wrote: > > > > > > Obviously the Yanks aren't listening to BBC quite as much, but if it > > matters, my closest neighbors, about 1/4 mile (or 400m) away would make 30M > > unusable when their plasma TV was turned on. I have empirical data... My RF > > environmental noise is something to boast about until the plasma TV's come > > on. > > > > Dave K7NG > > --- In digitalradio@yahoogroups.com, Andy obrien <k3ukandy@> wrote: > > > > > > ---------- Forwarded message ---------- > > > From: Mike Terry <miketerry73@> > > > Date: Sat, Aug 14, 2010 at 2:44 AM > > > Subject: [dxld] Are plasma TVs killing radio? > > > To: DXLD <d...@yahoogroups.com> > > > > > > > > > > > > > > > The Register > > > Posted in Wireless by By Bill Ray > > > 12 August 2010 > > > > > > The Radio Society of Great Britain is asking anyone with a plasma TV to > > > let > > > it know if they've had trouble getting BBC Radio 4 lately. > > > > > > The Radio Society of Great Britain represents the radio ham community, > > > though it sees itself as having a wider remit. When not organising > > > competitions to see who has the biggest beard can transmit a 10MHz signal > > > furthest, the RSGB tries to protect the interests of radio users of all > > > kinds by tracking possible causes of interference, which prompts its > > > latest > > > appeal. > > > > > > Recently the interference effort has been focused on mains networking kit > > > - > > > people running Ethernet signals over in-home electrical wires - but the > > > Society reckons that plasma TVs are another source of interference worthy > > > of > > > greater attention. > > > > > > Anecdotal stories abound of plasmas putting out interference below 30MHz, > > > and even extending into the higher frequencies where commercial radio can > > > be > > > found, but the Society is trying to cast a wider net to see if it's a > > > genuine problem. > > > > > > The plan is to make a presentation to CISPR (the International Special > > > Committee on Radio Interference) in the next few weeks if enough > > > complaints > > > can be accumulated - so if you've got a plasma and you think it's plotting > > > against your radio, drop the RSGB a line at > > > plasma.tv@<plasma.tv%40rsgb.org.uk> > > > > > > http://www.theregister.co.uk/2010/08/12/plasma_tv_interference/ > > > > > >
