[Elecraft] RFI and Direct tv or Dish network

[Edward R Cole]

First off, the Dish-NET receiver produced no RFI.  It was not digital 
satellite so used s-video connections to Home Theater receiver which 
was connected to TV via HDMI.  New Direct-TV receiver is high-def 
digital receiver so it uses HDMI interconnect to home 
theater.  TV/home theater is on other side of wall from ham shack.

The PS is not a wall wart.  It looks more like an overgrown laptop 
PS.  But I can try toroids on power cable and HDMI to see if that 
quiets it.  Really no problem most of the time as 2m is not in use 
when TV is in use.  I have not determined what the dc voltage out of 
the satellite PS.

KX3 in AM mode works fine as RFI sniffer.

73, Ed - KL7UW

From: "John K9UWA" <john at johnjeanantiqueradio.com>
To: elecraft at mailman.qth.net
Subject: Re: [Elecraft] RFI and Direct tv or Dish network
Message-ID: <573C9D63.28664.20E1D055 at john.johnjeanantiqueradio.com>
Content-Type: text/plain; charset=US-ASCII

Jim is 100% correct. The Direct TV receivers are HORRIBLE for noise
generation. Maybe you can't hear it if your Ham Antenna is far enough away
but it is there for sure. I bought a Sony model ICF-2001 to use looking for
various noises about the house. You don't want the later models as they
have auto noise blankers in them. The radio covers AM/SW/FM and does
AM or SSB.

Jim is exactly correct regarding the Wall Wart type switcher supply on these
Direct TV receivers. They are 12.6 vdc so easy for us Hams to pick up a
nice small linear transformer powered regulated supply. I also hooked up
the Modem and Router to this same linear supply. Yes every one of them
made noise.

Next the HDMI cable from the Direct TV receiver to the TV set also mades
lots of racket. I use TWO of the FT-240 mix 31 cores and managed to get
about 5 turns through both chokes. That killed the HDMI cable noise.

John k9uwa




73, Ed - KL7UW
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