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Search: Keyword(s): ; Posts Made By: Calaveras
Forum: HDTV Technical   08-24-2016, 03:12 PM
Replies: 17
Views: 162
Posted By Calaveras
To the best of my knowledge an AR-22 is an AR-22....

To the best of my knowledge an AR-22 is an AR-22. Only the control boxes changed. Any control box should work.
Forum: Local HDTV Info and Reception   08-24-2016, 10:31 AM
Replies: 14,044
Views: 1,090,294
Posted By Calaveras
They have a problem somewhere in the transmission...

They have a problem somewhere in the transmission chain that looks to us like reception dropouts.

Doug and his contact at the station both responded to my latest e-mail. They say that they...
Forum: HDTV Technical   08-24-2016, 08:44 AM
Replies: 17
Views: 162
Posted By Calaveras
I see they have the clamps too. It's nice you can...

I see they have the clamps too. It's nice you can buy the replacement parts if you want to refurbish the rotor.

On another thread about old rotors I brought up the issue of bad starting...
Forum: Local HDTV Info and Reception   08-24-2016, 08:18 AM
Replies: 14,044
Views: 1,090,294
Posted By Calaveras
When I was a poor high school student I had a...

When I was a poor high school student I had a U-100 turning a 2 element quad. An offshore wind event blew the quad over and cracked the center part of the rotor. It still turned! After that I had it...
Forum: Local HDTV Info and Reception   08-24-2016, 08:02 AM
Replies: 14,044
Views: 1,090,294
Posted By Calaveras
Do they guarantee the capacitor to be good? If...

Do they guarantee the capacitor to be good? If the box has been sitting around for years the capacitor probably isn't good.

No other rotor looks like a U100 so it was easy to recognize.

If you...
Forum: Local HDTV Info and Reception   08-24-2016, 07:53 AM
Replies: 14,044
Views: 1,090,294
Posted By Calaveras
KNTV is booming in here this morning again with...

KNTV is booming in here this morning again with an SNR of 27 dB. I watched for awhile and saw several episodes of breaking up. The Sony reported zero errors during these periods. It's not a reception...
Forum: Local HDTV Info and Reception   08-23-2016, 08:05 PM
Replies: 14,044
Views: 1,090,294
Posted By Calaveras
Oh.... It's a U-100 rotor with a thrust bearing....

Oh.... It's a U-100 rotor with a thrust bearing. That was the best TV rotor you could get at the time. Chances are that all that's wrong with it is the capacitor in the control box is bad. The less...
Forum: Local HDTV Info and Reception   08-23-2016, 05:52 PM
Replies: 14,044
Views: 1,090,294
Posted By Calaveras
Do you have a link to it? 800 posts is a lot to...

Do you have a link to it? 800 posts is a lot to look through. :)

Chuck
Forum: HDTV Technical   08-23-2016, 05:34 PM
Replies: 17
Views: 162
Posted By Calaveras
If I understood correctly he's talking about the...

If I understood correctly he's talking about the plate that the U-bolts go through to clamp the mast to the top of the rotor.

I think this what he needs:
...
Forum: Local HDTV Info and Reception   08-23-2016, 04:36 PM
Replies: 14,044
Views: 1,090,294
Posted By Calaveras
An antenna pointed to Fremont will not receive...

An antenna pointed to Fremont will not receive all the channels, just all the Fremont channels. A separate small UHF antenna with an A/B switch would do it or replace your old rotor. You might be a...
Forum: HDTV Technical   08-23-2016, 01:10 PM
Replies: 17
Views: 162
Posted By Calaveras
It's unlikely that rotor will work even if you do...

It's unlikely that rotor will work even if you do get a control box for it. It needs to be disassembled cleaned, re-grease the bearings and gears and replace the terminal board. If by some miracle it...
Forum: Local HDTV Info and Reception   08-23-2016, 12:54 PM
Replies: 14,044
Views: 1,090,294
Posted By Calaveras
KNTV having a problem and you having a problem...

KNTV having a problem and you having a problem would both result in similar looking dropouts. You wouldn't be able to tell which one was which.

I checked KNTV a little after 7 am and there was no...
Forum: Local HDTV Info and Reception   08-23-2016, 10:34 AM
Replies: 14,044
Views: 1,090,294
Posted By Calaveras
KNTV has been coming in this morning. I checked...

KNTV has been coming in this morning. I checked it a bit after 7 am and there were no problems. I just checked it again before 10:30 am and still no problems. The signal was very good with an SNR of...
Forum: Local HDTV Info and Reception   08-23-2016, 07:34 AM
Replies: 14,044
Views: 1,090,294
Posted By Calaveras
Must be a severe multipath issue when you're...

Must be a severe multipath issue when you're pointed at SF. You should be able to receive KSTS and the other full power stations up there on a paperclip. You can see the transmitters.

So the Weak...
Forum: HDTV Technical   08-22-2016, 07:41 PM
Replies: 26
Views: 345
Posted By Calaveras
It's normally placed in the house near the TV but...

It's normally placed in the house near the TV but it's not critical.
Forum: Local HDTV Info and Reception   08-22-2016, 07:19 PM
Replies: 14,044
Views: 1,090,294
Posted By Calaveras
I'll let you speculate on that. :) What is...

I'll let you speculate on that. :)

What is "Weak Signal History?" 31 - 33 dB SNR is not a weak signal.

Chuck
Forum: Local HDTV Info and Reception   08-22-2016, 06:51 PM
Replies: 14,044
Views: 1,090,294
Posted By Calaveras
You should be able to see the tower from there...

You should be able to see the tower from there unless you're behind a hill. It's on Mt. Allison in Fremont. How about the other 6 transmitters up there? (KAXT, KGO, KTVU, KDTV, KQEH & KICU)

11.3...
Forum: Local HDTV Info and Reception   08-22-2016, 05:53 PM
Replies: 14,044
Views: 1,090,294
Posted By Calaveras
Don't hold your breath for KNTV getting fixed. I...

Don't hold your breath for KNTV getting fixed. I had another e-mail exchange with Doug and he doesn't think it's at the station. He thinks we have weak signals, FM interference, whatever. I know...
Forum: HDTV Technical   08-22-2016, 05:32 PM
Replies: 26
Views: 345
Posted By Calaveras
All depends on how much you're willing to degrade...

All depends on how much you're willing to degrade the noise figure. The farther from the antenna the preamp the higher the system noise figure. Closer is better.
Forum: Local HDTV Info and Reception   08-22-2016, 04:19 PM
Replies: 14,044
Views: 1,090,294
Posted By Calaveras
I suggest you e-mail Doug. I think he's the...

I suggest you e-mail Doug. I think he's the contact person and can reach the engineers. KNTV is out here this afternoon so I can't verify it.

Where are you located that you cannot receive KSTS? I...
Forum: Local HDTV Info and Reception   08-22-2016, 07:04 AM
Replies: 14,044
Views: 1,090,294
Posted By Calaveras
I got this reply from Doug and then Francis. It...

I got this reply from Doug and then Francis. It was okay here this morning during the news.

Chuck



Chuck, thank you for reporting your issue. Where are you picking use from? We'll look into...
Forum: Local HDTV Info and Reception   08-21-2016, 08:06 PM
Replies: 14,044
Views: 1,090,294
Posted By Calaveras
I just checked KNTV 11.1 and it is coming in at...

I just checked KNTV 11.1 and it is coming in at SNR 24 dB. It has almost constant break-ups. 11.3 on the KSTS transmitter is perfect.

I sent Doug Lung an e-mail about it.

Chuck
Forum: HDTV Technical   08-20-2016, 06:59 PM
Replies: 17
Views: 226
Posted By Calaveras
You can't do that. Preamp overload affects all...

You can't do that. Preamp overload affects all the stations, especially the weak ones, not just the strong ones. No preamp means no preamp.
Forum: HDTV Technical   08-20-2016, 05:34 PM
Replies: 17
Views: 226
Posted By Calaveras
These signals are far stronger than they appear...

These signals are far stronger than they appear to be here because the Resolution Bandwidth is only 30 KHz. The TV bandwidth is 6 MHz so the signal the TV is seeing is actually 23 dB stronger. Those...
Forum: HDTV Technical   08-20-2016, 04:14 PM
Replies: 17
Views: 226
Posted By Calaveras
I didn't realize you were using an amplifier....

I didn't realize you were using an amplifier. Remove it completely. You don't need it with those super strong stations only a few miles away.
Showing results 1 to 25 of 992

 
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