Forum: Antennas
2-Jan-2018, 4:19 PM
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Replies: 121
Views: 683,525
A Tower & Antenna Evolution
The tower shown in previous posts has been in use since 1971. It is located in Russell County, KY. The earlier posts showed some antennas that have been resident on the tower. Hopefully, a series...
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Forum: Antennas
24-Jun-2017, 1:16 PM
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Replies: 121
Views: 683,525
Compare: Antennas Direct DB8e & CM-4228HD
(continued from previous post)
Part 4. Compare 6 antennas (DB8, DB8e, 4228, 4228HD, 91xg, HDB91x)
Having earlier measured four other high-gain UHF antennas relative to the HDTVi antenna, this...
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Forum: Antennas
24-Jun-2017, 1:15 PM
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Replies: 121
Views: 683,525
Compare: Antennas Direct DB8e & CM-4228HD
(continued from previous post)
Part 3. Data Collection & Analysis
The amount of data collected represents:
Number of UHF channels: 23
Measurements per channel
DB8e4 and 4228HD: 9
HDTVi:...
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Forum: Antennas
24-Jun-2017, 1:14 PM
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Replies: 121
Views: 683,525
Compare: Antennas Direct DB8e & CM-4228HD
(Continued from previous post)
Part 2. Images of Three Antennas at Test site
The following are images of the two antennas at the test site (antenna center height=25 feet).
Image below shows...
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Forum: Antennas
24-Jun-2017, 1:14 PM
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Replies: 121
Views: 683,525
Compare: Antennas Direct DB8e & CM-4228HD
Antenna tests conducted on June 15, 2017.
Objective: Compare performance of selected VHF antennas while receiving DFW TV channels.
Antennas:
1. Terk HDTVi (as reference)
2. Antennas Direct...
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Forum: Antennas
6-Jul-2016, 3:33 PM
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Replies: 121
Views: 683,525
Part 5 (continued from previous post)
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Part 5 (continued from previous post)
Specifications, Measurement, Analysis and Discussion
In an effort to reconcile the various gain and SWR numbers available for these two antennas, the...
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Forum: Antennas
6-Jul-2016, 3:32 PM
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Replies: 121
Views: 683,525
Part 4 (continued from previous post)
4NEC2...
Part 4 (continued from previous post)
4NEC2 Analysis and Discussion
Antenna simulation software (4NEC2) could be useful in comparing antennas. Generally, software analysis is not a substitute...
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Forum: Antennas
6-Jul-2016, 3:32 PM
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Replies: 121
Views: 683,525
Part 3 (continued from previous post)
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Part 3 (continued from previous post)
Attached are Graphs depicting a summary of data analysis.
1. Average received power levels, (Image below):
An average 9 measurements of each channel (8...
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Forum: Antennas
6-Jul-2016, 3:31 PM
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Replies: 121
Views: 683,525
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Forum: Antennas
6-Jul-2016, 3:30 PM
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Replies: 121
Views: 683,525
Compare: Antennas Direct C5 & Televes Yagi B-III
A series of antenna tests conducted on July 1, 2016.
Objective: Compare performance of selected VHF antennas while receiving DFW TV channels
Antennas:
1. Antennas Direct C5
2. Televes Band...
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Forum: Antennas
29-Apr-2016, 4:13 PM
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Replies: 121
Views: 683,525
The HDTVi Antenna as a Reference
(continued from previous post)
Part 4. The HDTVi Antenna as a Reference
Another way of comparing gain of the antennas is to directly compare received signal levels to that of the HDTVi antenna....
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Forum: Antennas
29-Apr-2016, 4:12 PM
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Replies: 121
Views: 683,525
Received Signal Strength Data Analysis
(continued from previous post)
Part 3. Received Signal Strength Data Analysis, Five UHF Antennas
Attached are four Graphs depicting a summary of data analysis.
1. Average Relative Gain,...
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Forum: Antennas
29-Apr-2016, 4:11 PM
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Replies: 121
Views: 683,525
Images of 5 Antennas at Test site
(continued from previous post)
Part 2. Images of 5 Antennas at Test site
The following are images of the five antennas at the test site (antenna center height=25 feet).
Image below shows...
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Forum: Antennas
29-Apr-2016, 4:10 PM
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Replies: 121
Views: 683,525
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Forum: Antennas
30-Jan-2015, 9:00 PM
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Replies: 121
Views: 683,525
Compare Several Preamplifiers (cont.)
Referring to previous posts:
- Compare Several Preamplifiers OTA-DFW (http://forum.tvfool.com/showpost.php?p=48946&postcount=87)
- Compare Preamplifiers - Test Procedure & Configuration...
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Forum: Antennas
30-Jan-2015, 8:13 PM
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Replies: 121
Views: 683,525
Pete, thank you for your comments.
...
Pete, thank you for your comments.
Your signal situation does seem particularly tough.
Guess most people have a more difficult TVfool chart than this one in DFW.
This DFW location is...
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Forum: Antennas
25-Jan-2015, 4:04 PM
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Replies: 121
Views: 683,525
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Forum: Antennas
25-Jan-2015, 3:07 PM
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Replies: 121
Views: 683,525
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Forum: Antennas
24-Jan-2015, 2:14 PM
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Replies: 121
Views: 683,525
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: Antennas
20-Sep-2014, 3:14 PM
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Replies: 121
Views: 683,525
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: 683,525
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: 683,525
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: 683,525
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Forum: Antennas
13-Sep-2013, 1:10 PM
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Replies: 121
Views: 683,525
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: Antennas
7-Sep-2013, 12:54 PM
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Replies: 121
Views: 683,525
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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