[Elecraft] K3 Noise Blanker ahead or behind roofing filter?

[Brett gazdzinski]

I would ask the people if I could put a filter on the power
line to the TV.

That might reduce or eliminate the QRN.

Maybe get a surge protector/filter setup and convince them 
it's a protection device for their investment.

I bought phone filters and installed them on the neighbors on both
sides of my house to eliminate the AM getting in the phones.
I also had to filter an audio system with extended speaker
wires as I came through quite loud even with the thing
turned off. Some caps across the speaker outputs cured it
totally!

Brett
N2DTS

> -----Original Message-----
> From: elecraft-bounces at mailman.qth.net 
> [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of 
> Kenneth A. Christiansen
> Sent: Tuesday, June 12, 2007 7:50 AM
> To: elecraft at mailman.qth.net
> Subject: [Elecraft] K3 Noise Blanker ahead or behind roofing filter?
> 
> I have K2 SN 1031 and an IC-746PRO. Last week my next door neighbor 
> brought home a large screen TV that looks to be the rear projection 
> type. I didn't pay much attention to it as they unloaded it 
> but now find 
> it puts out lots of QRN. It  puts out S9 on the PRO 60 HZ QRN 
> on 20, 15, 
> 10 6 and 2 meters. Those are the bands I have antennas that work. The 
> noise blanker in theK2 and the PRO both eliminate this bad QRN right 
> down to the background noise :-)  when there are now strong 
> signals on 
> the band but when a strong station such as the W1AW code 
> sessions come 
> on 20 meters, (20 over 9 in ND), than the K2 using NB1 has problems 5 
> KHZ or so either side of W1AW. NB2 has problems up to 10 KHZ 
> either side 
> of W1AW and the PRO has problems 15 KHZ either side of W1AW 
> :-( . Is the 
> noise blanker on the K3 ahead of the roofing filter or behind the 
> roofing filter. If it is behind the roofing filter buying a 
> K3 might put 
> me back on the air :-)      but if it is ahead of the roofing filter 
> than would I have the same problem as the K2 :-( ? I have 
> looked at the 
> FAQ part of the Elecraft K3 site and do not find the answer to this 
> question. I just need a short answer so please do not start a long 
> thread on my station or observations etc.
> 
> 73 and thanks for the help.
> 
> W0CZ
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