DirectTV HD box drives four monitors in my radio room.
Not a single dB of noise anywhere in the spectrum noted to date.
Thanks????.......................?............Joe / W8SS
AKA: Dr. Joe Mesh, D.M.D., C.A.G.S. (Prosthodontics)
from beautiful downtown HELL, Michigan
Always available at: info@drsmesh.com
............................................................................
............
See us on the Web at: drsmesh.com
-----Original Message-----
From: RFI [mailto:rfi-bounces@contesting.com] On Behalf Of myles landstein
Sent: Monday, August 26, 2013 3:52 PM
To: jim@audiosystemsgroup.com; rfi@contesting.com
Subject: Re: [RFI] Recent RFI status - Direct TV and Dish?
I have a few DirectTV boxes. Some old, some new.
havn't had too much noise from the boxes, but certain ham frequencies
160-20m can make them unhappy with hi power I suspect the heads (lna) in
the dish arm just got overloaded . within say 30ft antenna to antenna.
thats with a text book install and set up good swr , resonant antenna, good
grounds etc
havent' given any rfi to the set top boxes
goodluck
N2EHG
"No matter where you go there you are". Buckaroo Bonzi across the 8th
Dimension...
On Aug 26, 2013, at 3:43 PM, "W5JR.Mike" <w5jr.mike@gmail.com> wrote:
> I agree with Jim to watch out for the switcher power supplies. My own
experience with a Comcast unit replaced over the summer was noticed to be
quite ugly on 160m later in the fall when my focus turned back to TopBand. I
could easily trace the electrical wiring in our walls with my AM radio
looking for the source. Unplugged the very tiny wall wart and all was quiet.
I plugged it back in after the contest and found flipping it 180* was quiet,
but as originally plugged in was noisy. My outlet indicated proper wiring
from one of the usual plug-in checkers. I left it plugged in the "quiet"
way.
>
> tnx
> Mike / W5JR
>
> On Aug 26, 2013, at 3:23 PM, Jim Brown <jim@audiosystemsgroup.com> wrote:
>
>> On 8/26/2013 11:33 AM, Tim Duffy wrote:
>>> Also, how about RFI problems associated with nearby transmitting
>>> antennas that might cause RFI overload problems to the Dish or Direct TV
systems - as in TVI?
>>
>> I would expect any issues to be the result of 1) noisy switching power
supplies, 2) noise from the downlink electronics, and 3) common mode
coupling on the coax (both TX and RX). and I would expect them to be easily
solved by winding turns around ferrite cores. I had DirecTV in Chicago, and
never had any issues, with antennas and DirecTV downlead in close proximity
(5-25 ft). I don't remember if I did anything with chokes.
>>
>> 73, Jim K9YC
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