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Search: Posts Made By: timgr
Forum: Help With Reception 25-Oct-2014, 1:21 PM
Replies: 12
Views: 16,837
Posted By timgr
Dense materials like stucco and concrete will...

Dense materials like stucco and concrete will attenuate TV signals more than lighter materials like wood and asphalt. Wire mesh should shield out near 100% of TV signal.

But attic antenna...
Forum: Help With Reception 24-Oct-2014, 9:32 PM
Replies: 12
Views: 16,837
Posted By timgr
Stucco could be a problem because of the wire...

Stucco could be a problem because of the wire mesh embedded in it. Aiming through the roof may be ok. If it's a big attic, move the antenna around in it if it does not work perfectly at first.

A...
Forum: Help With Reception 24-Oct-2014, 3:28 PM
Replies: 27
Views: 35,762
Posted By timgr
I would point at the weaker one. Probably won't...

I would point at the weaker one. Probably won't matter.

Compression fittings for me - I've never used the others.

Power lines? One of the industry people will have to comment about the power...
Forum: Help With Reception 24-Oct-2014, 2:28 PM
Replies: 27
Views: 35,762
Posted By timgr
Not an antenna engineer, or part of the industry,...

Not an antenna engineer, or part of the industry, but I am an engineer.

12 and 8 should be fine with a Y5713 pointed at them, no amplifier, assuming there are no trees or buildings blocking the...
Forum: Help With Reception 24-Oct-2014, 10:56 AM
Replies: 2
Views: 8,956
Posted By timgr
Did you leave the 91XG behind? Antennas Direct...

Did you leave the 91XG behind? Antennas Direct products are well made ... I would take it and the preamp with me. The HDB91X is likely an imported copy of the 91XG, made more cheaply. Less than $25...
Forum: Help With Reception 24-Oct-2014, 10:48 AM
Replies: 4
Views: 11,927
Posted By timgr
It means 261 degrees on a compass. The magnetic...

It means 261 degrees on a compass. The magnetic pole of the earth is different from the actual pole, and a compass will read slightly different from a map or your GPS(?), for example. Just buy an...
Forum: Antennas 23-Oct-2014, 10:18 PM
Replies: 1
Views: 17,932
Posted By timgr
You'd probably get more exposure in the Reception...

You'd probably get more exposure in the Reception Issues forum.

An attic installation may work ok for you, but there's a lot more uncertainty about how it's going to turn out than with a rooftop...
Forum: Help With Reception 23-Oct-2014, 9:52 PM
Replies: 27
Views: 35,762
Posted By timgr
Yeah, that's how I'd do it. The wavelength at VHF...

Yeah, that's how I'd do it. The wavelength at VHF is long, thus the long antenna for sensitivity... You could try the Y5713, but it's 6.9 dB gain vs. 9.4 for the Y10713. The RCA preamp is certainly...
Forum: Help With Reception 23-Oct-2014, 8:09 PM
Replies: 27
Views: 35,762
Posted By timgr
If you want to mount a dedicated VHF-high...

If you want to mount a dedicated VHF-high antenna, an Antennacraft Y10713 is about the most sensitive you can get without heroic measures. http://www.antennacraft.net/Antennas/AntennasVHF.html
Forum: Special Topics 23-Oct-2014, 4:00 PM
Replies: 7
Views: 71,175
Posted By timgr
So what's to consider besides bandwidth, noise...

So what's to consider besides bandwidth, noise figure and dynamic range? I'd think you could get a start on your "best" metric by simply comparing specs. Here is a primer on rf signal amplifier specs...
Forum: Help With Reception 23-Oct-2014, 12:05 PM
Replies: 8
Views: 22,178
Posted By timgr
You can install an antenna yourself. Roof...

You can install an antenna yourself. Roof mounting is the way to go, placing the antenna as high as possible. Can you go any higher? For example, you can put a 10' mast in a 10' tripod (maybe with...
Forum: Help With Reception 22-Oct-2014, 3:44 PM
Replies: 9
Views: 12,873
Posted By timgr
Offered in a friendly collegial tone... :) ...

Offered in a friendly collegial tone... :)

I'm not doubting your expertise, but I am sure noise margin is widely defined in terms of voltage:...
Forum: Help With Reception 22-Oct-2014, 1:47 PM
Replies: 9
Views: 12,873
Posted By timgr
I don't think so. Tell me what I'm doing wrong. ...

I don't think so. Tell me what I'm doing wrong.

60 dB = 20 log10(x)

60/20 = 3

10^3 = x = 1000.

Maybe you are thinking of power. My reading of the literature says NM is like SNR, ie...
Forum: Help With Reception 22-Oct-2014, 11:10 AM
Replies: 9
Views: 12,873
Posted By timgr
Hi Larry - yes, your antenna should be grounded...

Hi Larry - yes, your antenna should be grounded for safety. Here is a thread that discusses grounding, which may help you. http://forum.tvfool.com/showthread.php?t=901

No personal experience with...
Forum: Help With Reception 22-Oct-2014, 12:24 AM
Replies: 6
Views: 14,605
Posted By timgr
This article may be of interest to you -...

This article may be of interest to you - http://www.kyes.com/antenna/stackluge.html

Looking ath the NM (noise margin) column in your report, channel 17 is at -13.9 dB and 24 is at -10.2....
Forum: Help With Reception 20-Oct-2014, 12:24 AM
Replies: 5
Views: 10,064
Posted By timgr
Hi - your link does not work. Can you create...

Hi - your link does not work.

Can you create the TVFool report, and give us that link?
Forum: Help With Reception 19-Oct-2014, 10:26 PM
Replies: 7
Views: 10,954
Posted By timgr
It's still 2-edge at 80, but a NM of 17. One edge...

It's still 2-edge at 80, but a NM of 17. One edge at 85 and LOS at 90.

No tower this year ...
Forum: Help With Reception 19-Oct-2014, 3:17 PM
Replies: 7
Views: 10,954
Posted By timgr
Here it is at 100' - becomes LOS....

Here it is at 100' - becomes LOS. http://www.tvfool.com/?option=com_wrapper&Itemid=29&q=id%3dd243dabb5b2226

Funny - I don't see any other channels on the list broadcasting on 11.
Forum: Help With Reception 18-Oct-2014, 3:25 PM
Replies: 3
Views: 9,874
Posted By timgr
Hi Charles - Another place to find chimney...

Hi Charles -

Another place to find chimney mounts at a reasonable price would be here - http://www.antennapartsoutlet.com/Pages/Products/ChimneyMounts.html - Easy Up has a web site, and...
Forum: Help With Reception 17-Oct-2014, 3:00 PM
Replies: 7
Views: 10,954
Posted By timgr
Chances I can get ...

WENH, by pointing right at it with a Y10713 and preamp?

http://www.tvfool.com/?option=com_wrapper&Itemid=29&q=id%3dd24389d48ebf73

Here it is at 60' - though I don't know offhand how I'd get...
Forum: Help With Reception 16-Oct-2014, 6:51 PM
Replies: 9
Views: 15,902
Posted By timgr
Re your little amplified antenna, typically you...

Re your little amplified antenna, typically you can't defeat the amplifier. If you unplug it, the internal amplifier turns into an attenuator, and blocks any signal. So it could be overload, or it...
Forum: Help With Reception 16-Oct-2014, 3:45 PM
Replies: 11
Views: 14,449
Posted By timgr
I would put an eave mount on the upper gable. ...

I would put an eave mount on the upper gable.

http://www.antennapartsoutlet.com/sitebuilder/images/roh_gem4060-330x280.jpg
...
Forum: Help With Reception 16-Oct-2014, 12:56 PM
Replies: 8
Views: 13,713
Posted By timgr
If you don't want to go on your roof, you can...

If you don't want to go on your roof, you can hire an installer to do the work for you. There is a link at the top of the forum to connect with an installer. The installer could also advise on what...
Forum: Help With Reception 15-Oct-2014, 10:00 PM
Replies: 2
Views: 8,794
Posted By timgr
Here's a thread that may help yopu on the...

Here's a thread that may help yopu on the grounding issue: http://forum.tvfool.com/showthread.php?t=901

I would expect the ridge to your north to be incorporated in your TVFool report. It is...
Forum: Help With Reception 15-Oct-2014, 6:56 PM
Replies: 11
Views: 13,948
Posted By timgr
As tonyp063 writes, you'd lose too many channels...

As tonyp063 writes, you'd lose too many channels with a DB8e without an additional dedicated high-VHF antenna and a combining network. The DB8e will not receive real channels below 14, including WJLA...
Showing results 251 to 275 of 371

 

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