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post #11611 of 11629 Old 12-24-2014, 03:39 PM
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Originally Posted by Calaveras View Post
I've been seeing exceptional conditions to Salinas on and off today. Tonight I received KYMB on RF 27 for the first time.
Chuck
Now a test of your antenna repairs.

We just had 5 minutes of extreme wind here. 2:25pm
It may reach you shortly.

Salinas reception was enhanced here yesterday. But nothing extreme or exceptional.
RF 27 Advances to KTSF 26 here.
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post #11612 of 11629 Old 12-25-2014, 08:53 AM
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Originally Posted by 888CALLFCC View Post
Now a test of your antenna repairs.

We just had 5 minutes of extreme wind here. 2:25pm
It may reach you shortly.
Wind issues vary dramatically with location. In most cases the high winds I get are southerly and associated with storms. The Sierra Foothills don't get the northwest and north winds as much as the Bay Area or the west side of the Sacramento Valley and certainly not like the East Bay hills. Today my local forecast is winds northwest at 8 mph.

You may remember a big north wind event a few years ago in November that blew down thousands of trees in the eastern Sierra with 100mph+ winds. I had winds around 40mph during that event which was as high as I have seen from the north.

When I see a forecast with wind gusts approaching 50mph I crank down the 72' tower and tie off the boom of the lowest ham antenna to keep the wind from turning the mast in the rotor. The 55' tower with the main TV antennas comes down half way to increase its wind load rating.

Chuck
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post #11613 of 11629 Old 12-25-2014, 02:16 PM
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Kscz-ld

KSCZ-LD supposedly came on the air in July transmitting from a site a little east of Morgan Hill on channel 20. It should be easy to receive from the Morgan Hill/Gilroy area. Has anyone ever seen this station? I wonder if it's another LP DTV phantom station?

Chuck
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post #11614 of 11629 Old 12-26-2014, 05:14 AM
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A friend of mine who visited the area in early 2013 drove up to the tower and saw it transmitting an incredibly weak signal with no PSIP and nothing but black video with static in it. I've attached the picture he sent me, and the link to the TSReader data is below.

http://www.rabbitears.info/screencap...167279-0_0.htm

- Trip

Attached Thumbnails
Click image for larger version

Name:	mo20thumb_1_0.jpg
Views:	18
Size:	53.7 KB
ID:	442226  

N4MJC

Comments are my own and not that of the FCC (my employer) or anyone else.

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post #11615 of 11629 Old 12-26-2014, 07:40 PM
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K03HY channel 3 from Mt. Tamalpais is back on the air.
There's no PSIP information though and I'm not getting any picture.

My complete SF Bay Area DTV Station Lists: http://www.choisser.com/sfonair.html
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Last edited by Larry Kenney; 12-26-2014 at 07:47 PM. Reason: Updated info
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post #11616 of 11629 Old 12-26-2014, 07:43 PM
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Originally Posted by Larry Kenney View Post
K03HY channel 3 from Mt. Tamalpais is back on the air.
It seems like on .... at a reduced power here.
Not like before.
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post #11617 of 11629 Old 12-26-2014, 07:48 PM
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Originally Posted by 888CALLFCC View Post
It seems like on .... at a reduced power here.
Not like before.
I just updated my post above. The signal strength is normal here, but they're not sending out any PSIP information. On my receivers I'm not getting any picture, just a black screen.

Larry

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post #11618 of 11629 Old 12-26-2014, 07:57 PM
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Originally Posted by Larry Kenney View Post
I just updated my post above. The signal strength is normal here, but they're not sending out any PSIP information. On my receivers I'm not getting any picture, just a black screen.

Larry
I will know soon..... will have a spectrum analyzer in a few short weeks (2015)
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post #11619 of 11629 Old 12-26-2014, 08:17 PM
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Originally Posted by 888CALLFCC View Post
I will know soon..... will have a spectrum analyzer in a few short weeks (2015)
Oh no, more almost black thumbnails posted.


SHF
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post #11620 of 11629 Old 12-26-2014, 09:32 PM
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Yep, K03HY is back on at the previous strength. KCSO dropped from SNR 31 dB to 15 dB when I'm pointed at it. It's amazing that a station 115 miles away can cause that much interference to one only 14 miles away.

Chuck
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post #11621 of 11629 Old 12-26-2014, 10:02 PM
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If you stare at it long enough, you can almost see the image of santa!

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Oh no, more almost black thumbnails posted.


SHF
Your favorite thumbnail ? ..... the noise floor ? LOL
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post #11622 of 11629 Old Today, 12:38 AM
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K03HY seems to be back to normal service now... at normal strength and picture quality and with no pixelation.

I'm surprised that a low power station with 2.5 kilowatts on channel 4 can reach 115 miles, Chuck. I thought the low VHF channels weren't any good for digital TV. Both of Keith's low VHF stations seem to have very good coverage.

Ben, great on the spectrum analyzer! I think you're going to have a lot of fun when you get it!

Larry

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post #11623 of 11629 Old Today, 08:39 AM
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Quote:
Originally Posted by 888CALLFCC View Post
I will know soon..... will have a spectrum analyzer in a few short weeks (2015)
What are you getting?

Chuck
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post #11624 of 11629 Old Today, 09:24 AM
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Quote:
Originally Posted by Larry Kenney View Post
K03HY seems to be back to normal service now... at normal strength and picture quality and with no pixelation.
I just checked KFTY and there's still pixelation. NBTV has very low audio. Even at full volume it is too low.


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I'm surprised that a low power station with 2.5 kilowatts on channel 4 can reach 115 miles, Chuck. I thought the low VHF channels weren't any good for digital TV. Both of Keith's low VHF stations seem to have very good coverage.
In theory it should work better than high VHF or UHF except:

1) There's about 10 dB more naturally occurring noise that everyone has on low VHF than UHF so stations need to run more power. Seems like no one considered this when the FCC came up with that 300 watt limit for low VHF. Stations found out they really needed 3000 watts. This is also the reason preamps don't do anything on low VHF. The natural noise overwhelms the low noise figure of the preamp.

2) Most people no longer want to put up an outdoor antenna with low VHF elements so they have little chance at reception.

3) Manmade noise, especially power line noise, is a terrible problem on low VHF. Your best hope is to live in a neighborhood with underground power lines. Where I used to live in Fremont had underground lines and I never saw "sparkles" on 2, 4 or 5. The alternative is to go to war with PG&E to get them to do their job of fixing noise problems. They really hate doing it.

Even if you get good reception on low VHF you'll still be subject to dropouts from sporadic-E propagation of stations 1000 miles away during the May through July "E" season. Thunderstorms will also cause pixelation. You just have to accept imperfect reception at times on low VHF. I get dropouts on KGO in the summer when there are thunderstorms over the Sierra crest 50 or miles more away. That problem doesn't completely disappear until you get to UHF.

Low VHF is not without at least some advantages. It refracts over hills much better than UHF. It is largely unaffected by trees. Back in the pre-cable or early cable days people up in Arnold (8 miles east of me), who all live in a pine forest, had only VHF antennas and watched mostly low VHF. That included 2, 4 and 5 from Sutro tower. High VHF wasn't as good but they got by. They didn't even bother with UHF.

Depending on what happens with repacking, we might see more low VHF stations.

Chuck
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post #11625 of 11629 Old Today, 03:39 PM
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Originally Posted by Calaveras View Post
What are you getting?

Chuck
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Digiair-pro ATSC
Out of stock until mid January.

In spectrum mode, It covers the whole tv band at once, or each channel individually with a marker.
hand-held unit small enough for roof top work.
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post #11626 of 11629 Old Today, 03:57 PM
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Originally Posted by Calaveras View Post
In theory it should work better than high VHF or UHF except:
came up with that 300 watt limit for low VHF. Stations found out they really needed 3000 watts. This is also the reason preamps don't do anything on low VHF. The natural noise overwhelms the low noise figure of the preamp.
Chuck
Here it shows weakness with everyday human activity.
I see problems when a motorcycle is in use outdoors, same goes when a neighbor starts a lawnmower.
And a troublesome T8 fluorescent ballast I have here.

I notice more of a problem with the audio here. Clicks & pops mostly, then a studder with sometimes picture pixelation.

You sure don't want a premium movie channel on Low VHF. But for Home shopping & Daystar, its perfect !

Probably only works well with shielded coax-cable in a closed cable tv system.
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post #11627 of 11629 Old Today, 05:00 PM
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Here it shows weakness with everyday human activity.
I see problems when a motorcycle is in use outdoors, same goes when a neighbor starts a lawnmower.
And a troublesome T8 fluorescent ballast I have here.

Ignition noise used to be a common problem but I haven't heard that for a long time. Modern engines seemed to have licked it. I haven't had that issue with my mobile radio in decades. Must be an old motorcycle. I'm not surprised at the lawnmower but that's an infrequent issue.

There's no reason for a ballast to be generating noise on 50MHz and higher. It must be defective and it certainly isn't meeting its FCC specs. Replace it.

What antenna do you have on low VHF? I forgot what you are using.

Chuck
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post #11628 of 11629 Old Today, 08:43 PM
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Originally Posted by 888CALLFCC View Post
I notice more of a problem with the audio here. Clicks & pops mostly, then a studder with sometimes picture pixelation.

I forgot to ask..... Are you sure this isn't K03HY just having its link problems? There have been long periods for some time now of frequent problems. I see it all the time on KFTY, audio and video problems but the TV says 0 errors and a good SNR. Your new analyzer will be able to tell you what the problem is if you can't monitor errors now.

I would think that if anyone would be having noise issues it would be Larry but he seems to receive it okay even without a dedicated low VHF antenna.

Chuck

Edit: I just checked KFTY; SNR=23 dB, 0 Errors, but only blips of picture and bleeps of audio. I expect that K03HY is the same.

Last edited by Calaveras; Today at 08:51 PM.
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post #11629 of 11629 Old Today, 11:53 PM
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There's no reason for a ballast to be generating noise on 50MHz and higher. It must be defective and it certainly isn't meeting its FCC specs. Replace it.
What antenna do you have on low VHF? I forgot what you are using.
Chuck
A few years ago, I replaced the kitchen light ballast to save energy...... The ballast has a capacity to run "up to" 2 lamps.
I wired it correctly for only 1 lamp. (not 2) so one lamp works possibly overdriven somewhat.
It may possibly meet the UL / FCC specs only with the rated "2 lamps" capacity and in a commercial environment.
I'm not so sure it's defective, just possibly low quality.
It overdrives the lamp because when switched on cold, (under 60 degrees) the lamp is noticeably brighter then the rest of the lamps on a different ballast.

I'm sure you can buy a electronic ballast made for "just one lamp".
But most electronic ballasts can run / drive up to 4 lamps in a variety of sizes.
This was not possible with the older magnetic ballast(s) that were more lamp specific.

Yes, ... the only solution is to replace this problem ballast ... I simply do not use this light now ... when watching tv ... redneck troubleshooting solved.

It is in the same light fixture that another ballast lights the remaining 2 tubes. (3 tube fixture) 1 tube=dim, 2 tubes=brighter, 3 tubes=brightest (with 2 light switches)
It took me over a year to realize that when this lamp is on >>> VHF reception tanks.

For all of Sutro tower, San Bruno Mt, & K03HY I use a old radio shack VU-75 in the attic, ... pointed towards Marin county.
For all other stations, ... I do manual cable swaps to other fixed antennas.

KFTY-2 is around 12% and I have not made any efforts yet on that station. I did notice that KFTY-2 requires elevation, signal goes up with elevation.
No other station has that "elevation" problem, except KFTY-2, ... KEMO-50 works without the elevation.
The amp did work with KFTY-2, but it was one of those extreme low noise type 1 db of noise or less.

Quote:
Originally Posted by Calaveras View Post
I forgot to ask..... Are you sure this isn't K03HY just having its link problems? There have been long periods for some time now of frequent problems. I see it all the time on KFTY, audio and video problems but the TV says 0 errors and a good SNR. Your new analyzer will be able to tell you what the problem is if you can't monitor errors now.

I would think that if anyone would be having noise issues it would be Larry but he seems to receive it okay even without a dedicated low VHF antenna.

Chuck
The K03HY link problems last for minutes / hours. ... What I do here may just cause the flash/temporary type errors.
A combination of both. When you hit the light switch, about 1 second later ... the audio may (or may not pop)
I think the microwave impacts that station too, but some days are worse then others.
And some days are problem free.
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