[Elecraft] RFI and Direct tv or Dish network

John K9UWA john at johnjeanantiqueradio.com
Wed May 18 12:50:43 EDT 2016


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


> On Tue,5/17/2016 8:26 PM, Edward R Cole wrote:
> > I suppose some ferrites and shielding the separate switcher would 
> > solve this.
> 
> Or replace the switcher with a linear supply.
> 
> 73, Jim K9YC



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