[SBE] OTA digital TV interference

[David Baker]

Thanks everyone for your thoughts on this.

FWIW, I believe all Chicago TV channels are now UHF.

I had this idea that a quick and cheap fix for EMI might be to put a
ferrite bead or some type of choke on the coax from the antenna to TV, to
act as a filter for noise.  But this
probably wouldn't do much good if the noise spectrum was large.  Maybe it
might only clear up a couple of channels.  Not sure if I would be on the
right track with that idea.

If reflections, does there exist a diversity or similar type of antenna
system that would not be too expensive?

If someone is only interested in local OTA TV in the city, it's too bad
that there might not be a solution for this.

On Mon, Mar 16, 2015 at 10:28 AM, John Peterson <jpeterson at prairiepublic.org
> wrote:

> In general VHF channels would be more susceptible to EMI and UHF channels
> more so to reflections, and from my experience, higher UHF channels are
> more prone to reflections then lower UHF.
>
> John Peterson
> CSTE
> Fargo, ND
>
> On Mon, Mar 16, 2015 at 10:14 AM, David Baker <dbaker at addison-il.org>
> wrote:
>
>> 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
>>>>
>>>> _______________________________________________
>>>> The SBE Roundtable, SBE at sbe.org
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>>>>
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>>>
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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
>>
>> _______________________________________________
>> The SBE Roundtable, SBE at sbe.org
>> To unsubscribe, go to https://pairlist7.pair.net/mailman/options/sbe
>>
>> https://pairlist7.pair.net/mailman/listinfo/sbe
>>
>
>
> _______________________________________________
> The SBE Roundtable, SBE at sbe.org
> To unsubscribe, go to https://pairlist7.pair.net/mailman/options/sbe
>
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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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