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Author Topic: NOAA weather radio station KWO35 RFI issues with Coast Guard?  (Read 45816 times)
KF7CG
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Posts: 1213




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« Reply #15 on: March 21, 2014, 10:46:21 AM »

Another item to add to the mix is image rejection on the receiver receiving the interference and the possible combinations local oscilator harmonics, interfering signal and image frequency.

Given that the Weather transmitter appears to be in an RF rich environment, it could be intermod with all the local transmitters in something like a corroded overlap on tower legs.

In our area we have lost the usability of two different repeater frequencies to intermod problems. Both transmitters were in RF rich environments. Too many transmitters, too much power and local metal buildings yeilds problems for all.

KF7CG
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KE2KB
Member

Posts: 1085




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« Reply #16 on: May 26, 2018, 01:48:48 PM »

It's been a while, but unfortunately the KWO35 transmitter is still off the air. I find it very difficult to believe that given all the expertise that is available to solve this issue, that it has not been solved.
Is there another issue besides the interference that is keeping the transmitter down?

Perhaps, instead of looking for a new site in NYC, the transmitter should be moved into NJ. While that move may reduce coverage over maritime areas, it might eliminate the interference issue, and having some coverage would be better than none.

OTOH, it might be time to reevaluate the entire NOAA weather radio program. Is it still needed?
How far offshore can someone reliably connect with the Internet?
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WA2ONH
Member

Posts: 513




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« Reply #17 on: June 13, 2019, 10:40:19 AM »

An update of NOAA's KWO35 Weather transmitter dated June 12, 2019 from this Bulletin:

https://nwschat.weather.gov/p.php?pid=201906121909-KOKX-NOUS41-PNSOKX

NOUS41 KOKX 121909
PNSOKX
CTZ005>012-NJZ002-004-006-103>108-NYZ067>075-078>081-176>179-162000-

PUBLIC INFORMATION STATEMENT
NATIONAL WEATHER SERVICE NEW YORK NY
309 PM EDT WED JUN 12 2019

...PUBLIC INFORMATION STATEMENT...

...THE NOAA WEATHER RADIO NYC TRANSMITTER IS EXPECTED TO RETURN TO
SERVICE AUTUMN 2019...

THE NOAA WEATHER RADIO TRANSMITTER THAT SERVES THE NYC METROPOLITAN
AREA IS EXPECTED TO RETURN TO SERVICE IN AUTUMN 2019 AFTER AN
EXTENDED OUTAGE. THE NEW LOCATION FOR KWO-35 WILL BE AT THE TOP OF
THE EMPIRE STATE BUILDING IN MIDTOWN MANHATTAN.


IN NOVEMBER 2017, SERVICE WAS TERMINATED DUE TO FAILED LEASE
NEGOTIATIONS. THE OUTAGE REQUIRED THE NWS TO RE-LOCATE THE
TRANSMITTER TWO TIMES. WHILE THE PROCESS OF IDENTIFYING POSSIBLE NEW
LOCATIONS WAS CHALLENGING, IT WAS ULTIMATELY COMPLETED. NOW THAT A
NEW SITE HAS BEEN FINALIZED, NWS IS AUTHORIZED TO BEGIN NEW
INSTALLATION PROCEDURES AND SYSTEM TESTING TO ENSURE THE TRANSMITTER
SIGNAL WILL PERFORM AT OPTIMAL LEVELS. THIS PROCESS WILL TAKE
SEVERAL MONTHS. HOWEVER, IF ALL GOES WELL, WE COULD HAVE THE
TRANSMITTER BACK SOONER THAN ANTICIPATED.

KWO35 WILL RESUME BROADCAST ON A FREQUENCY OF 162.550 MHZ ON 750
WATTS.


IN THE MEANTIME, LOCAL NWS OBSERVATIONS, FORECASTS, AND DATA FOR THE
NYC METROPOLITAN AREA CAN BE FOUND ON:

THE WEB AT: http://HTTP://WWW.WEATHER.GOV/OKX

FACEBOOK AT: http://HTTPS://WWW.FACEBOOK.COM/NWSNEWYORKNY

TWITTER AT: http://HTTPS://TWITTER.COM/NWSNEWYORKNY


IF YOU HAVE ANY COMMENTS OR QUESTIONS, PLEASE CONTACT SUSAN
BUCHANAN, NWS ACTING DIRECTOR OF PUBLIC AFFAIRS AT
SUSAN.BUCHANAN@NOAA.GOV OR 301-427-9000.

VOICE RECORDINGS OF NWS WEATHER INFORMATION FOR THE NYC METROPOLITAN
AREA WILL CONTINUE AT 631-924-0517.

WE WILL PROVIDE UPDATES ON THE STATUS OF THE NYC NOAA WEATHER RADIO
TRANSMITTER THROUGH PUBLIC INFORMATION STATEMENTS WHEN ADDITIONAL
INFORMATION BECOMES AVAILABLE.

$$
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73 de WA2ONH  <dit dit> ... Charlie
---------------------------------------------------------------------------------
"Never be satisfied with what you know, only with what more you can find out"
Dr David Fairchild 1869-1954 US Scientist
KC6RWI
Member

Posts: 156




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« Reply #18 on: June 13, 2019, 01:10:25 PM »

Seems to like a lot of power for a NOAA station. I always had the impression it was more like the power a 2 meter repeater would have. I guess different locations different needs. 750 watts?
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WA2ONH
Member

Posts: 513




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« Reply #19 on: June 13, 2019, 02:10:12 PM »

See NOAA's Nationwide Station Listing Using Broadcast Frequencies (Select State)
https://www.nws.noaa.gov/nwr/coverage/station_listing.html

New York Stations power from 100 to 1,000 watts
https://www.nws.noaa.gov/nwr/coverage/stations.php?State=NY

California Stations power from 80 to 500 watts
https://www.nws.noaa.gov/nwr/coverage/stations.php?State=CA

Your mileage may vary!
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73 de WA2ONH  <dit dit> ... Charlie
---------------------------------------------------------------------------------
"Never be satisfied with what you know, only with what more you can find out"
Dr David Fairchild 1869-1954 US Scientist
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