Forum: Help With Reception
30-Jan-2015, 7:29 PM
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Replies: 40
Views: 66,036
Not sure.
Unless there is something a bit...
Not sure.
Unless there is something a bit unusual that has not been discussed;
There are several good, or maybe acceptable, antenna options with preamplifier.
Seems the first thing to...
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Forum: Help With Reception
27-Jan-2015, 1:45 AM
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Replies: 40
Views: 66,036
Thank you HDTV-OTA for your kind words and...
Thank you HDTV-OTA for your kind words and comments.
Regarding your inquiry, others have provided good information in this thread.
HDTV-OTA, a few words about each of your proposed...
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Forum: Antennas
25-Jan-2015, 4:04 PM
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Replies: 121
Views: 1,170,893
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Forum: Antennas
25-Jan-2015, 3:07 PM
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Replies: 121
Views: 1,170,893
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Forum: Antennas
24-Jan-2015, 2:14 PM
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Replies: 121
Views: 1,170,893
Compare Several Preamplifiers OTA-DFW
Signal measurements from several preamplifiers were compared, while receiving selected UHF channels and one VHF channel in the Dallas Fort Worth area.
Preamps Compared (shown in image below):
...
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Forum: Help With Reception
19-Jan-2015, 6:53 PM
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Replies: 40
Views: 66,036
Pretty much agree with GroundUrMast's above...
Pretty much agree with GroundUrMast's above comments.
There is a good chance that the CM4228HD is a good antenna for your location. This assumes you are mounting the antenna outside.
...
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Forum: Antennas
20-Sep-2014, 3:14 PM
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Replies: 121
Views: 1,170,893
UHF Signal Strength vs Antenna Height (AGL)
This post is a continuation of:
UHF Signal Strength vs Antenna Height (AGL) (http://forum.tvfool.com/showpost.php?p=46528&postcount=79)
In the previous post linked above; the signal strength of...
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Forum: Antennas
20-Sep-2014, 2:14 PM
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Replies: 121
Views: 1,170,893
Pete, that's a nice image of your vertically...
Pete, that's a nice image of your vertically stacked HDB8-X antennas.
Interesting.
There can be certain locations in elevation (height) where an antenna with an aperture that is small in...
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Forum: Antennas
14-Sep-2014, 7:30 PM
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Replies: 121
Views: 1,170,893
UHF Signal Strength vs Antenna Height (AGL)
In May 2012, Bob Nelson (forum member re_nelson (http://forum.tvfool.com/member.php?u=1759)) and I performed some experiments to observe the effects (in a suburban area) of UHF signal strength...
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Forum: Antennas
14-Sep-2014, 6:47 PM
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Replies: 121
Views: 1,170,893
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Forum: Antennas
4-Sep-2014, 12:32 AM
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Replies: 1
Views: 14,477
Stvcmty, your idea will probably work fine.
...
Stvcmty, your idea will probably work fine.
Normal reflectors, to a large degree, isolate the active antenna elements from external effects, in rearward directions.
Your having antennas...
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Forum: Antennas
1-Sep-2014, 4:30 PM
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Replies: 4
Views: 16,819
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Forum: Antennas
25-Jul-2014, 8:34 AM
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Replies: 11
Views: 27,318
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Forum: Antennas
25-Jul-2014, 1:18 AM
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Replies: 11
Views: 27,318
Balun: 4:1 and 1:1
You probably know that PVC only shields twin lead from the weather, it does not electrically shield it. PVC is a lossy dielectric at UHF frequencies, I would not use it continuously close to twin...
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Forum: Antennas
24-Jul-2014, 3:18 PM
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Replies: 11
Views: 27,318
Stack 4 Antennas: Twin-lead to Coax
The resistance would drop to 100 Ohms if three (300 Ohm) resistive lines were paralleled.
- Four in parallel would be 75 Ohms.
You are writing about an application of Ohm's law: parallel and...
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Forum: Reception Devices
28-Jun-2014, 4:04 PM
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Replies: 27
Views: 130,562
Tuner Sensitivity & Multipath
If using a preamplifier, the sensitivity of the tuner is not very critical. Sensitivity is mainly determined by the noise figure of the tuner. In most cases when using a typical preamp, the noise...
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Forum: Special Topics
9-Mar-2014, 12:21 AM
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Replies: 6
Views: 29,676
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Forum: Antennas
23-Sep-2013, 6:04 PM
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Replies: 7
Views: 19,701
3/4 Wave Length Transformation
Both seem correct.
That is, a 3/4 wavelength could transform similar to a 1/4 wavelength section. And yes, 3 transformations is one way of looking at it.
Roughly,
First 1/4 wave...
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Forum: Antennas
13-Sep-2013, 1:10 PM
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Replies: 121
Views: 1,170,893
Televes DAT-75 vs. Antennas Direct 91XG
A pair of UHF antennas were compared:
Antennas Direct 91XG and Televes DAT-75
Both antennas have built-in baluns.
Equipment used in the tests:
- Push-up sectioned mast with two ~5 ft....
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Forum: Special Topics
12-Sep-2013, 1:01 PM
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Replies: 8
Views: 42,846
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Forum: Special Topics
12-Sep-2013, 1:11 AM
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Replies: 8
Views: 42,846
Don't know.
Years ago, I measured noise...
Don't know.
Years ago, I measured noise figure of VHF & microwave prototypes for military use. The prototypes would be similar to an unshielded TV preamp.
Here in Dallas, the ambient noise...
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Forum: Special Topics
11-Sep-2013, 11:55 AM
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Replies: 8
Views: 42,846
Winegard LNA-200 Components
Hi Pete,
The following is some guesswork based on your images and information.
It appears that the LNA-200 has two active amplifier devices.
The UHF portion is amplified by Q2, an ATF-54143...
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Forum: Special Topics
11-Sep-2013, 2:02 AM
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Replies: 8
Views: 42,846
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Forum: Special Topics
10-Sep-2013, 1:06 AM
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Replies: 8
Views: 42,846
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Forum: Antennas
7-Sep-2013, 12:54 PM
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Replies: 121
Views: 1,170,893
Thanks Pete. Glad you like.
Maybe...
Thanks Pete. Glad you like.
Maybe close to a conclusion for the long Yagis. Additional work was done for reliability reasons and reduction of losses. Earlier briefly mentioned homebrew:...
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