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Old 5-Oct-2017, 2:46 AM   #21
ckwsp101_tv
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I refreshed the link

http://www.tvfool.com/?option=com_wr...e6a44ae36c6631

There is a chance that after the repack
KNTV 11.1 (RF12) on Mt. San Bruno will move to
RF 13.

http://www.avsforum.com/forum/45-loc...a-ota-499.html
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Old 5-Oct-2017, 3:11 AM   #22
rabbit73
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Thanks for refreshing the link, but that doesn't work. It has been deleted from the tvfool server because it is out of date. It will be necessary to do a new report.

post 1, last part of link:
3de6a44ae36c6631
post 21, last part of link:
3de6a44ae36c6631

It's the same report.

This is the 50 ft report in post 9 that says "The requested report ID is no longer on our server. To start a new analysis, click here."
http://www.tvfool.com/?option=com_wr...f1f02b36a29948
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Last edited by rabbit73; 5-Oct-2017 at 3:18 AM.
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Old 5-Oct-2017, 3:19 AM   #23
ckwsp101_tv
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Browser cut and paste issue

http://www.tvfool.com/?option=com_wr...e6a4535ed606db
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Old 5-Oct-2017, 3:24 AM   #24
rabbit73
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Quote:
There is a chance that after the repack
KNTV 11.1 (RF12) on Mt. San Bruno will move to
RF 13.
That seems to be true:

http://www.rabbitears.info/market.ph...&callsign=kntv
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Old 5-Oct-2017, 3:30 AM   #25
rabbit73
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Thank you for the new report link; it works fine.

I will study your report, but I'm not sure that I can add anything useful other than it's the terrain and the tree.

Have you asked for help on the AVS SF local reception thread that you linked?
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Last edited by rabbit73; 5-Oct-2017 at 3:52 AM.
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Old 5-Oct-2017, 4:08 AM   #26
ckwsp101_tv
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Thank you for responding.

I think vertical stacked VHF balun polarity was correct.
The SiliconDust tuner diagnostic reports 10% quality improvement
over single VHF antenna
I can view KNTV (RF 12) when signal quality is above 55%. There is more
variation in recent months. Symbol quality sometimes goes to zero. Multipath
issues continue.

I agree it is likely the terrain and tree.

I will first try replacing baluns.


Will check out the AVS forum.
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Old 5-Oct-2017, 12:06 PM   #27
ADTech
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Quote:
There is a chance that after the repack
KNTV 11.1 (RF12) on Mt. San Bruno will move to
RF 13.
A chance? No, a certainty.

KNTV has been assigned RF13, KGO will be moved to RF 12, and KRON wll be moved to RF 7 as part of the repack process. All moves are scheduled for the spring of '20 for the Bay area.
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Old 5-Oct-2017, 10:34 PM   #28
ckwsp101_tv
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Here is current antenna location on tripod.



I guess growing trees degrading VHF reception.
Will try to trim tree limbs on my property.
Attached Images
File Type: png antennatreessmall.png (232.2 KB, 116 views)
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Old 6-Oct-2017, 3:03 AM   #29
rabbit73
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Thanks for the oblique satellite photo; it helps.

Here is the KNTV terrain profile:



Is the antenna here (I used the vertical instead of the oblique):



or here:





Is the antenna at the teardrop or at A.

Are B and C solar panels? Thermal or PV?

Do you have an inverter? They can cause interference on VHF.

What is D?
Attached Images
File Type: jpg ckwsp101_tvTVFp2KNTV.JPG (106.0 KB, 96 views)
File Type: jpg ckwsp101_tvTVFgrnLines.JPG (118.5 KB, 98 views)
File Type: jpg ckwsp101_tvTVFgrnLines3.jpg (106.7 KB, 96 views)
File Type: jpg ckwsp101_tvTVFroof.JPG (74.8 KB, 94 views)
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Last edited by rabbit73; 6-Oct-2017 at 3:14 AM.
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Old 6-Oct-2017, 5:17 PM   #30
ckwsp101_tv
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Antennas placed at the tear drop.
At this position UHF channel reception is fine.
VHF RF 12 gradually degraded over the last 6 months.
I can view alternate KNTV NBC 11.3 on RF 49 from Mt Allison San Jose.


B and C are open areas.
D is over the roof copper water pipe repair done 10 years ago.


Nearby houses do have roof solar systems. I would expect panel interference
to be greater during the day and less during the night. I will take more measurements
using the SiliconDust diagnostic program.

I'm suppose it could be other interference.
The residential development has underground power distribution from the 60s.
The county is slowly converting to LED intersection lights.That was done 2 years ago
Could I use AM radio as a interference detector?

My SiliconDust tuner is 2 years old. Maybe the power supply is failing and weak station
reception is first symptom of pending failure.


To do list:

Replace baluns and check connections before rainy season.
Replace SiliconDust tuner wall wart power supply.

If simple measures do not improve situation I may just bail on RF 12. Depend
on RF 49 for NBC network content.
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Old 6-Oct-2017, 8:10 PM   #31
ckwsp101_tv
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An old SiliconDust forum posting suggests noise in pre-amp or powered splitters
could lower signal quality. I'm going to assume the RCA pre-amp is working ok.
If all other measures fail then re exam issue raised in the SiliconDust posting.
If RCA premap really needs replacment maybe upgrade to the AD Juice pre-amp.

https://forum.silicondust.com/forum/...&t=4474#p25503

Quote:
Splitters and amplifiers can introduce noise which will lower the Signal Quality, even if the Signal Strength increases.
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Old 6-Oct-2017, 9:11 PM   #32
rabbit73
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Thanks for the details.
Quote:
Antennas placed at the tear drop.
At this position UHF channel reception is fine.
Looks like the signal path is between two trees.
Quote:
VHF RF 12 gradually degraded over the last 6 months.
Tree growth?
Quote:
Could I use AM radio as a interference detector?
Yes, interference that is heard on the AM broadcast band is often strong enough to affect VHF-High TV reception. A battery operated portable can be used as a direction finder; its built-in loop antenna is directional. Tune to a clear spot at the low 550 end and then at the high 1600 end.

The last case I helped with was detected on an AM radio in a car as it drove in a road with the power line along side. The source of the interference was a battery charger affecting VHF-High. Other cases involved LED lights, and switchmode AC to DC power adapters for laptops.

Some of the sources of interference are constant; others time related.
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Last edited by rabbit73; 6-Oct-2017 at 9:20 PM.
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