Des Moines, IA - HDTV - Page 148 - AVS Forum | Home Theater Discussions And Reviews
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post #4411 of 4426 Old Yesterday, 04:26 AM
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Quote:
Originally Posted by Calaveras View Post
Please follow the instructions in the sticky above about antenna threads, your location in the title and a link to your TV Fool report and then maybe we can help you.
Sorry about that. Changes should be reflected in original post now.
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post #4412 of 4426 Old Yesterday, 05:38 AM
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What are the actual issues you are having?

An antenna in an attic will last pretty much forever if left alone. The odds of something happening to the antenna itself (if left alone) are about the same as winning Lotto.
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post #4413 of 4426 Old Yesterday, 06:04 AM
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Originally Posted by ProjectSHO89 View Post
What are the actual issues you are having?

An antenna in an attic will last pretty much forever if left alone. The odds of something happening to the antenna itself (if left alone) are about the same as winning Lotto.
There's always been an issue here or there. Like the 8.2 or sometimes even main channels (8) being temperamental with reception.
And by that, I mean digital dropout and flat-out 'no reception'. We'll have to rescan.
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post #4414 of 4426 Old Yesterday, 07:15 AM
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The key word, here, is "sometimes." How often do you have issues? Once an hour? Once a week?

How long is the run from the set to the antenna and what does it go through (# of wall plates, splitters, joiners)? that'll tell us if you need a pre-amp.

One thing I notice from eyeballing a map is that you'd be pretty close to the final approach for the airport, depending on the wind direction. Low jets create nasty multipath issues while they're passing overhead.

If it's not even that often, it could be weather fronts moving through.

The other key word is "rescan." How often are you doing that? Do you lose all of the channels or do you just have to rescan to get KCCI?

Two things to do.. note what is going on when you have signal issues. Second is to check every connection all the way back to the antenna. Take it apart, examine the connection (making sure the center conductor hasn't turtled back into the coax, someplace). And put everything back together. Then see if the problems still exist.

One more question.. which way do you have the antenna pointing? And what's around it in the attic? Could be it's picking up static every time your heater kicks on.

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post #4415 of 4426 Old Yesterday, 07:42 AM
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Your top 8 stations (KDSM-WOI) are extremely strong. I'm ignoring WOI on RF 5 and using WOI on RF 50. You should not use a preamp. It will likely overload. Reception issues in the attic are often caused by multipath. I'd recommend putting the antenna on the roof. That almost always improves reception.
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post #4416 of 4426 Old Yesterday, 09:13 AM
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Reception issues on VHF channels in residential areas are usually caused by interference, most commonly from electrical devices or from local FM radio stations. Amplifiers only exacerbate the issue when in strong signal areas.

Reception issues on UHF stations is usually, as Calaveras mentioned, due to multipath and much less rarely with VHF. The key to reliable UHF reception relies on one of the following: Luck, patience, and experimentation.

Multi-path occurs when the primary line of sight signal path is blocked, most commonly by trees and buildings, and the antenna is picking up whatever signals are making it either through or around (or both) the impairment(s). Placing the antenna in the attic, while very convenient, usually only makes the problem worse.

I've attached several tip sheets that I routinely send out to customers who contact us directly for assistance, you may find them useful. Please note also that we have folks here seven days a week to assist in issues like this, contacting us directly is always encouraged.

Quote:
We'll have to rescan.
If nothing has changed on the station's end, there is never a need to re-scan unless your TV or converter box is faulty or has gotten its internal memory corrupted. Otherwise, it's about as effective as a placebo is for an illness.
Attached Files
File Type: pdf Attic antenna_or Not.pdf (173.4 KB, 8 views)
File Type: pdf Troubleshooting VHF Reception.pdf (36.5 KB, 8 views)

Tech support for Antennas Direct

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post #4417 of 4426 Old Yesterday, 01:56 PM
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I used GoogleEarth [with TV and FM Transmitter Icons downloaded from TVFool and FMFool: then Doubleclick on *.kmz Files] to find your approximate LAT/LONG [about 2-mi South of WOI-TV]....and then used THAT to find your FMFool Report (see below). You have THREE SUPER-EXTREMELY High FM Signals and some of their 3rd Order Intermodulation Products fall on top of Ch8 [and also Ch11]. This COULD be causing your problem. Those FM Signals could ALSO be forcing the AGC (Automatic Gain Control) in the VHF part of your Tuner to FULL Attenuation, making it less sensitive to other VHF Signals. [There are usually SEPARATE VHF and UHF Input Band Pass Filters and AGC in typical Super-Heterodyne type Tuners.]

PS: Yes, they are on 3 out of the 4 Towers you can see 1.5, 2.0 and 3.5 miles North of you.....ignoring the 0.1-mi difference...

I would recommend installing a FULL-BAND FM FILTER on the Input of the TUNER [cuz FM signals that strong COULD also be leaking in via Coax Downlead], such as following [NO, NOT the one from Radio-Shack, it has much less attenuation on lower FM Band in order to PASS Ch6].:
https://www.antennasdirect.com/store...l?cjid=6155355

And FOR SURE, do NOT use a Preamp or Distribution Amplifier.....


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post #4418 of 4426 Old Yesterday, 02:08 PM
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I get this for FM; still quite strong
http://www.fmfool.com/modeling/tmp/7...e/Radar-FM.png

And I see a LOT of trees in the area
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post #4419 of 4426 Old Yesterday, 02:10 PM
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zamboknee

Please do an FM signal report here:
http://www.fmfool.com/index.php?opti...pper&Itemid=29

If you can not measure it, you can not improve it.
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post #4420 of 4426 Old Yesterday, 05:18 PM
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Another new channel. 17.4 is TBD, some quirky thing for millennials (according to Wikipedia).

https://en.wikipedia.org/wiki/TBD_(TV_network)

They'll be airing Back in Time, a 2015 documentary about the Back to the Future movies.

Thurs, Feb 16, 7-9pm and
Sat, Feb 18, 5-7pm.

And it looks like Fox 17 might be dropping Grit in favor of Charge!, a similarly-themed channel of action movies.

https://en.wikipedia.org/wiki/Charge!_(TV_network)

And in case some fans haven't noticed, MeTV has replaced the weekday hour-long episodes of Gunsmoke, with the early half-hour episodes, with Dennis Weaver as Chester. The prints look better than the ones they used a few years back when they aired under the title Marshall Dillon.

"This is my ancestor, Philo Farnsworth, inventor of television ... and, as a bonus, childhood obesity."--Professor Hubert J. Farnsworth on the Futurama episode "All the Presidents' Heads."


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post #4421 of 4426 Old Yesterday, 05:25 PM
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Quote:
Originally Posted by rabbit73 View Post
I get this for FM; still quite strong
http://www.fmfool.com/modeling/tmp/7...e/Radar-FM.png

And I see a LOT of trees in the area
Per GoogleEarth display of TV/FM Transmitter Icons, that is nowhere NEAR 2-mi South on 346-deg [re TN] Line-Of-Bearing to WOI-TV/FM Tower.....only a few houses for miles around & very few trees....mostly open fields....

Last edited by holl_ands; Yesterday at 05:30 PM.
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post #4422 of 4426 Old Yesterday, 06:10 PM
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that is nowhere NEAR 2-mi South on 346-deg [re TN] Line-Of-Bearing to WOI-TV/FM Tower
Eh, try the OTHER WOI-TV (UHF-50) tower, the one that's near downtown....
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post #4423 of 4426 Old Yesterday, 08:53 PM
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Quote:
Originally Posted by tanglecord View Post
Another new channel. 17.4 is TBD, some quirky thing for millennials (according to Wikipedia).

https://en.wikipedia.org/wiki/TBD_(TV_network)

They'll be airing Back in Time, a 2015 documentary about the Back to the Future movies.

Thurs, Feb 16, 7-9pm and
Sat, Feb 18, 5-7pm.

And it looks like Fox 17 might be dropping Grit in favor of Charge!, a similarly-themed channel of action movies.

https://en.wikipedia.org/wiki/Charge!_(TV_network)

And in case some fans haven't noticed, MeTV has replaced the weekday hour-long episodes of Gunsmoke, with the early half-hour episodes, with Dennis Weaver as Chester. The prints look better than the ones they used a few years back when they aired under the title Marshall Dillon.
correct on both diginets. Both are owned by Sinclair, who also owns Fox 17

Last edited by DrDon; Today at 07:18 AM. Reason: Added quote preparing for thread merge
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post #4424 of 4426 Old Yesterday, 09:06 PM
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Thank you ProjectSHO89


I used KBXF

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post #4425 of 4426 Old Today, 07:21 AM
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Thread merged with Des Moines local thread. Redirect left. Best of both worlds, that way.

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post #4426 of 4426 Old Today, 07:26 AM
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Threads merged.

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