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post #15661 of 15669 Old 08-17-2017, 11:14 AM
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The following information was received from Eric Dausman at Sutro Tower:

As we normally do every year around this time, next week, August 21-25, most Sutro Tower stations will be switching to their Auxiliary antennas between the hours of 9 AM and 4 PM in order to allow workers to perform routine maintenance and inspections on the Main antennas and support structure. Crews will be closely inspecting all the steel and attached antennas, abating any corrosion they find, and replacing the top warning lamps.

In general, the RF emissions from Sutro Tower around the neighborhoods are similar in strength to the emissions from the Main antennas. However, there is an area on the reservoir track adjacent to our east property line where the emissions are around 35% of the Federal standard.

You can review copies of the neighborhood studies by going to our website at: http://sutrotower.com/for-our-neighbors/

We are reserving all five days next week for this work. However, if we do not need all the time, we will not switch to the Aux antennas. We will let you know when the work is complete.

Thanks,

Eric Dausman
VP & COO
Sutro Tower, Inc.
415-681-8850

My complete SF Bay Area DTV Station Lists: http://www.choisser.com/sfonair.html
Lots of Broadcasting links and information: http://www.choisser.com/broadcast.html
Live reception scans from my HD Home Run receivers: http://www.larrykenney.com/hdhr/
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post #15662 of 15669 Old 08-18-2017, 03:14 PM
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I have just updated my TV station lists at http://www.choisser.com/sfonair.html - so if you see any incorrect information listed, please let me know. Thanks!

Larry

My complete SF Bay Area DTV Station Lists: http://www.choisser.com/sfonair.html
Lots of Broadcasting links and information: http://www.choisser.com/broadcast.html
Live reception scans from my HD Home Run receivers: http://www.larrykenney.com/hdhr/
Photos and info on my antennas: http://www.larrykenney.com/tvantennas.html
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post #15663 of 15669 Old 08-18-2017, 06:57 PM
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Until I looked at Larry's list I didn't realize that K03IC was on Mt. Tamalpias. I think this explains the strange SNR behavior I'm getting on KCSO also on RF 3. Even though KCSO is 30 dB above the noise I'm only getting an SNR of 20 dB when pointed at it. K03IC's heading is 13 degrees south of KCSO. When I point 30 degrees north of KCSO the SNR goes up to 22 dB (40 degrees off of K03IC). When I point 30 degrees south of KCSO the SNR drops to 17 dB (20 degrees off of K03IC).

I can't see K03IC on the analyzer with KCSO being so much stronger but I can see KTVJ on RF 4 also on Mt. Tam. I'm going to wait for favorable conditions to KCSO and unfavorable conditions to Mt. Tam and see if the KCSO SNR increases. That should confirm that the low SNR on KCSO is from interference and not multipath.

Chuck
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post #15664 of 15669 Old Yesterday, 09:26 AM
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Quote:
Originally Posted by Larry Kenney View Post
The following information was received from Eric Dausman at Sutro Tower:
This is a reminder that we will be operating on Auxiliary antenna today from 9AM to 4PM.

Thank you and best regards.

.................................................. ...........

Strange but I am having problems with KQED VC 9 RF 30 on some tuners. 08/21/2017 08:22

Perhaps due to the Sun as we have way too many solar panels installed.

At least KQEH VC 54 RF VC 50 appears to be just fine.

SHF

Last edited by SFischer1; Yesterday at 11:40 AM.
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post #15665 of 15669 Old Yesterday, 12:03 PM
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^^^^ the only stations that have no signal for is KOFY 20-1 and MeTV 20-2.
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post #15666 of 15669 Old Yesterday, 01:12 PM
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Not getting KOFY 20, KQED VC 9 RF 30 is coming in fine.

Lifespeed

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post #15667 of 15669 Old Yesterday, 03:12 PM
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Quote:
Originally Posted by lifespeed View Post
Not getting KOFY 20, KQED VC 9 RF 30 is coming in fine.
I think KQED was switching antennas, wait a hour and then check again.

Toast0's charts show the switch of antennas, check again ~ 5 PM and you will be able to see the switch back to the main antennas.

http://ruka.org/~toast/atscdata/chart.php?c=30

SHF
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post #15668 of 15669 Old Yesterday, 04:02 PM
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Lots of "outages" today with the b/u antennas doing the work. Everything should return to normal this evening.
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post #15669 of 15669 Old Yesterday, 04:03 PM
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It's interesting to see how different the signal strengths are on the Auxiliary antennas compared to the regular main antennas here just 3/4 mile from Sutro Tower. I lost KEMO 50 (RF 32) completely, going from normally being the strongest station to below the cliff edge on their Aux antenna. KOFY 20 (RF 19), KQED 9 (RF 30), KMTP 32 (RF 33), KCNS 38 (RF 39), and KCNS 60 (RF 43) are actually stronger and have better quality on their Aux antenna. It's interesting to note that most of them are stations that have their main antenna located on the northeast tower, so maybe I'm in a slight dead spot for that tower. The rest of the stations are about the same as they normally are.

Larry

My complete SF Bay Area DTV Station Lists: http://www.choisser.com/sfonair.html
Lots of Broadcasting links and information: http://www.choisser.com/broadcast.html
Live reception scans from my HD Home Run receivers: http://www.larrykenney.com/hdhr/
Photos and info on my antennas: http://www.larrykenney.com/tvantennas.html
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