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KTVU Problems Today - Oh No Giants Game!

Live in Campbell. Channel 2 normally not a problem except on clear hot days from time to time. But I'm getting a very low signal right now. Not getting a picture at all right now, for the last 30 minutes. Clear skies yes, but hot day, no. Other channels coming in fine, except that 4 is a bit flaky too. Anyone else?


Chris
 

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Live in Campbell. Channel 2 normally not a problem except on clear hot days from time to time. But I'm getting a very low signal right now. Not getting a picture at all right now, for the last 30 minutes. Clear skies yes, but hot day, no. Other channels coming in fine, except that 4 is a bit flaky too. Anyone else?

Chris
KTVU VC 2 has RF 48 better than RF 44 which is strange.

KTVU RF 44 has a big dip right now.

http://ruka.org/~toast/atscdata/chart.php?c=45&s=2014-10-25T16%3A07%3A54-07%3A00&e=

Do you know which you are receiving, RF 44 or RF 48?

And can you switch?

SHF
 

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I am on RF 44 and it's come back now. I tried RF 48 and got nothing. I get a signal strength of around 61, which is still weak. It was around 50 before when I was getting nothing. But it's stable now.


Thanks, Chris
 

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I am on RF 44 and it's come back now. I tried RF 48 and got nothing. I get a signal strength of around 61, which is still weak. It was around 50 before when I was getting nothing. But it's stable now.

Thanks, Chris
All the Sutro stations show a dip, KCSM the most.

Did Sutro have a brownout? :eek:

SHF
 

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I don't know if there are any analogs still on in Sacramento.

Chuck
A quick check done on 10/18 in Roseville, .... I still see analog channel 6 showing a character generated flashing text message.
not sure where or what station that is.

Analog 6 is still on in the bay area.
(Checked about two months ago,) 23 was still analog here in Hayward . (After switching KRCB off)
 

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All the Sutro stations show a dip, KCSM the most.

Did Sutro have a brownout? :eek:

SHF
I checked the graphs at toast0's garage and there certainly was a problem around 4 pm.

http://ruka.org/~toast/atscdata/chart.php?c=7&s=2014-10-27T00:00:00-07:00&e=

I watched the 4 pm news on KGO and the signal was better than average. I checked KPIX just before 4 pm and it was coming in. I can't imagine what happened.

Chuck


Edit: Upon closer examination, there appears to have been a drop in signal strength between 4 and 6 pm. It even affected KKPX but not KNTV.

http://ruka.org/~toast/atscdata/chart.php?c=41&s=2014-10-28T00:00:00-07:00&e=

This was probably just an atmospheric condition thing to the south bay and nothing to do with the transmitter power which is why I saw nothing here.
 

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A quick check done on 10/18 in Roseville, .... I still see analog channel 6 showing a character generated flashing text message.
not sure where or what station that is.
KEFM on the Sutter Buttes, another one of those FM stations.


Analog 6 is still on in the bay area.
(Checked about two months ago,) 23 was still analog here in Hayward . (After switching KRCB off)
KBFK, another FM station. 23 is KMUV Salinas.

I was aware of another analog signal on channel 22. It never has any modulation, just blank carriers. I figured it was something in Sacramento but the FCC database doesn't show any analog stations on 22 near Sacramento. Turns out it is K22HB in Mammoth Lakes. Was I surprised! I didn't think it was possible to receive anything from the east side of the Sierras but its transmitter is at 7900'.

Chuck
 

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Are you sure about K22HB? Their license has expired and was not renewed. It was licensed on the roof of building in Mammoth Lakes. A few checks of the site showed no transmitter or antenna.
 

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fox shows the w.s. in 720p only I see lots blur and grainy pq on my Samsung led, anyone agree that 1080p is better for sports? let's go giants bring it home tonite.
 

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Today K22HB filed to renew the license. It was to be filed by June 1st. Sightly late in filing. They also own K49KS-D Santa Rosa.
 

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Are you sure about K22HB? Their license has expired and was not renewed. It was licensed on the roof of building in Mammoth Lakes. A few checks of the site showed no transmitter or antenna.

Process of elimination. The other analog channel 22's are too far and this signal peaks in exactly the right direction.

Chuck
 

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hey chuck you said that you make your own balun for 91xg, is it optimize only for UHF, unlike the 91xg balun that is wideband. i took off balun on 91xg and looks like it needs to be soldered on? Can you explain what you did dude, txs. hope your at sfgiants parade 😂
 

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He made a coax balun which is inherently a narrow band balun, just like the standard UHF PCB balun that has been in use for a while. However, he could tune it for a specific frequency if he chose to do so.

If you want a wideband balun, just remove the PCB and install a standard wire-wound balun. That's what was standard on the driven element for our Yagi series up until 3 or 4 or 5 years ago.
 

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hey chuck you said that you make your own balun for 91xg, is it optimize only for UHF, unlike the 91xg balun that is wideband. i took off balun on 91xg and looks like it needs to be soldered on? Can you explain what you did dude, txs. hope your at sfgiants parade 😂

He made a coax balun which is inherently a narrow band balun, just like the standard UHF PCB balun that has been in use for a while. However, he could tune it for a specific frequency if he chose to do so.

If you want a wideband balun, just remove the PCB and install a standard wire-wound balun. That's what was standard on the driven element for our Yagi series up until 3 or 4 or 5 years ago.

First I need to define what I think is narrowband and broadband because I found different people have different ideas about this. To me narrowband is one or two channels wide and wideband would be the the entire UHF or high VHF TV band.

I replaced the 91XG baluns with wideband coaxial baluns.

Referring to the attachments:

1) Loss of the original 91XG balun on UHF. Two baluns measured back-to-back. Divide the loss by 2 to get the loss of one balun. Max loss is 1.6 dB. Min loss about 1.1 dB.
2) Loss of the 91XG PWB balun on UHF. Two baluns measured back-to-back. Divide the loss by 2 to get the loss of one balun. Max loss is 1.4 dB. Min loss about 0.5 dB.
3) Loss of the coaxial balun on UHF. Two baluns measured back-to-back. Divide the loss by 2 to get the loss of one balun. Max loss is 0.6 dB. Min loss
 

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