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[aprssig] HF/VHF APRS/Packet & "Big Screen" TV's

Dave Baxter dave at uk-ar.co.uk
Thu May 7 13:42:23 UTC 2009


Was about to say, you stand more chance of the TV QRM'ing the radio,
than the other way round.

Plasma TV's can be particularly bad at HF, LCD's less so (though not
silent!)

Since the adoption of EMC spec's regarding emmissions, most makers have
found the limit to their advantage, resulting in *More* uninteded
emissions than otherwise you might expect.   But under the test limit...

Whatever you do, if you use HF, do not deploy any power line home
network devices. (This is *Not* the same as PLA via the power
distribution grid.)  Even HPA devices are bad, UPA are unbelivable,
chattering away even when there is no data to send.   It's a *Huge*
problem over hear in the UK/EU at the moment.   And sadly unlikely to
get much better I suspect.   Interestingly, despite being unable to meet
the EMC regs, as a result of the laws of physics etc, they have been
released onto the market by a political decision, as much as anything
else.

See www.ukqrm.org for a warning of what could come down your street....
Minimal problems on VHF from these, but in the future?....

Regards.

Dave G0WBX.


> -----Original Message-----
> From: Len Revelle [mailto:n9ij at comcast.net] 
> Sent: 06 May 2009 23:43
> To: TAPR APRS Mailing List
> Subject: Re: [aprssig] HF/VHF APRS/Packet & "Big Screen" TV's
> 
> I have two big screens, a Sony and a Samsung. I get hash from 
> one, or both, on 144.39. It is sufficient to open the 
> squelch. The Play Station 3 also nails the freq.
> 
> Len Revelle N9IJ
> n9ij at comcast.net
> 
> 
> 
> On May 6, 2009, at 1:59 PM, Matthew Stennett wrote:
> 
> > I am considering a "Big Screen" TV, and have been wondering 
> about how 
> > these beasts react to an HF or VHF signal close by.
> > Specifically, if I put my PK-900 back on the air as an HF 
> Gate here in 
> > NE FL.
> > (yes; I am still around, and occasionally monitoring the 
> SIG, but have 
> > been MIA for a while) Unfortunately, I have not seen any real 
> > "upswing" in VHF APRS activity in my area, so I am 
> reluctant to spend 
> > the money on electricity, if it's in vain.
> > Anyway, if anyone has had any trouble with THEIR TV of this type, I 
> > would be interested in hearing from you.
> >
> > Matt Stennett
> >
> > WA4TKG / 7J6CAT
> >
> > Previously: " The ONLY APRS Station in J-Pan" (tm) 
> > _______________________________________________
> > aprssig mailing list
> > aprssig at tapr.org
> > https://www.tapr.org/cgi-bin/mailman/listinfo/aprssig
> 
> 
> 
> 



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