[SBE] OTA digital TV interference

[David Baker]

The location is within 10 miles of the station transmitters on Chicago's
west side, and signal strength is strong on most channels while the trains
are not on the tracks.

Partial or total breakup/loss occurs while trains are moving on the tracks
or standing still.  Some types of trains have a stronger effect than others,
for example if a freight train is moving through or stopped, vs a commuter
train.  Also, some channels are strong during train presence, with minimal
breakup,
while others have total loss at the antenna.  This led me to think EMI over
reflections.  I have to admit I have not yet put a spectrum analyzer in
place
to see what is happening there.

On Mon, Mar 16, 2015 at 9:50 AM, George J Molnar <George at molnar.com> wrote:

> When I was Chief at a station in Chicago, we saw both train (“L")
> reflection and pulse noise from the electrical system as interfering
> possibilities. Especially where the tracks were reasonably close (say in
> direct sight, and between the RX and TX).
>
> Filter unlikely to help, sadly. Only better antennas & feedlines,
>
>
>
>
> *George J Molnar*KF2T | AFA9GM
> Nevada, USA
> Twitter: @GJMolnar
>
>
>
> On Mar 16, 2015, at 7:46 AM, John Peterson <jpeterson at prairiepublic.org>
> wrote:
>
> How far from the tracks/trains is the recieve site?
> I would think you are dealing with reflections off the trains, rather then
> EMI.
>
> John Peterson
> CSTE
> Fargo, ND
>
> On Mon, Mar 16, 2015 at 9:30 AM, David Baker <dbaker at addison-il.org>
> wrote:
>
>> Good morning!
>>
>> I'm wondering if any TV station engineers are addressing the problem of
>> OTA digital TV interference and loss near trains, or if a solution can be
>> recommended for this problem.  For apartment buildings especially where
>> antenna height is not an option, if that would fix the problem at all.  Can
>> a filter be installed between antenna and TV that would help to remove what
>> I think is EMI coming from the trains?
>>
>> Thanks for any suggestions!
>>
>> --
>> Thank you,
>>
>> David Baker, CBTE
>> <http://www.sbe.org/sections/descriptions.php#CBTE_CBRE>, CBNT
>> <http://www.sbe.org/sections/descriptions.php#CBNT>
>> Media Production Coordinator
>> Community Relations Dept.
>> Village of Addison
>> office: 630-693-7554
>> cell: 708-935-7829
>> www.addisonadvantage.org
>>
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>
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-- 
Thank you,

David Baker, CBTE <http://www.sbe.org/sections/descriptions.php#CBTE_CBRE>,
CBNT <http://www.sbe.org/sections/descriptions.php#CBNT>
Media Production Coordinator
Community Relations Dept.
Village of Addison
office: 630-693-7554
cell: 708-935-7829
www.addisonadvantage.org
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