Forum: Antennas
6-Sep-2013, 2:14 PM
|
|
Replies: 121
Views: 1,170,893
Multipath: STB-Converter Performance
The reception of WHAS-11 using the stack of long-Yagis (http://forum.tvfool.com/showpost.php?p=37723&postcount=53) was evaluated through the end of 2010 and into 2011.
Most of the time the signal...
|
|
Forum: Antennas
30-Aug-2013, 4:31 PM
|
|
Replies: 121
Views: 1,170,893
Stacked Antennas: Multipath & Diversity Gain?
Continuing with a previous topic: Multipath: Antenna Stack & Diversity Gain? (http://forum.tvfool.com/showpost.php?p=37734&postcount=58)
The following is a thought experiment.
Consider...
|
|
Forum: Antennas
24-Aug-2013, 2:59 PM
|
|
Replies: 121
Views: 1,170,893
|
|
Forum: Antennas
23-Aug-2013, 8:40 PM
|
|
Replies: 121
Views: 1,170,893
|
|
Forum: Antennas
23-Aug-2013, 8:32 PM
|
|
Replies: 121
Views: 1,170,893
|
|
Forum: Antennas
17-Aug-2013, 3:07 PM
|
|
Replies: 121
Views: 1,170,893
Multipath: Antenna Stack & Diversity Gain?
Following up on a partial response (http://forum.tvfool.com/showpost.php?p=37726&postcount=55) to Pete’s thought provoking question as to whether space diversity gain could be a mechanism for...
|
|
Forum: Antennas
17-Aug-2013, 12:27 AM
|
|
Replies: 121
Views: 1,170,893
Yes, I'm not sure either.
The...
Yes, I'm not sure either.
The well-known Channel Master rotator and clones essentially use the synchronous motor in the control as a timer. So, it could be in newer units that a timing...
|
|
Forum: Antennas
16-Aug-2013, 8:07 PM
|
|
Replies: 121
Views: 1,170,893
Yes, the drop amplifiers use more current. The...
Yes, the drop amplifiers use more current. The regulators are more conservatively designed. And, all things being equal (which they seldom are), high dynamic range amplifiers consume more power.
...
|
|
Forum: Antennas
16-Aug-2013, 3:48 PM
|
|
Replies: 121
Views: 1,170,893
Two Long Yagis on Main Tower
The signals from a single long-Yagi (http://forum.tvfool.com/showpost.php?p=37565&postcount=51) were observed for a few days. Then, in October 2010, a second long-Yagi was installed on the main...
|
|
Forum: Antennas
10-Aug-2013, 6:48 PM
|
|
Replies: 6
Views: 118,221
It is not a complete re-layout, looks like a...
It is not a complete re-layout, looks like a minimum re-layout.
Probably etch was changed only where necessary, i.e. to replace components that may not be available or may be to costly.
An...
|
|
Forum: Antennas
10-Aug-2013, 4:27 PM
|
|
Replies: 6
Views: 118,221
Compare Original CM-777x to TVPRAMP1R
Hi Pete.
Thank you for your efforts.
Your efforts to characterize and describe components are undoubtedly helpful to many others.
Thank you for your images.
They looked familiar.
|
|
Forum: Antennas
9-Aug-2013, 3:08 PM
|
|
Replies: 121
Views: 1,170,893
Single Long Yagi on Main Tower
In October 2010, a single long-Yagi (http://forum.tvfool.com/showpost.php?p=37156&postcount=41) was installed at the top of the main tower mast along with an RC-9267 preamplifier. A Blonder Tongue...
|
|
Forum: Antennas
4-Aug-2013, 12:23 AM
|
|
Replies: 121
Views: 1,170,893
|
|
Forum: Antennas
3-Aug-2013, 1:22 PM
|
|
Replies: 121
Views: 1,170,893
Long-Yagi Gain Assessment
Previously shown were computer simulations of antennas (http://forum.tvfool.com/showpost.php?p=37314&postcount=45); Winegard YA-1713 and homebrew long Yagi. For the channels of interest (Channel 8...
|
|
Forum: Antennas
28-Jul-2013, 1:35 PM
|
|
Replies: 121
Views: 1,170,893
|
|
Forum: Antennas
27-Jul-2013, 11:53 PM
|
|
Replies: 121
Views: 1,170,893
4NEC2 Analysis: YA-1713 & Homebrew Long Yagi
Analysis with 4NEC2 software (http://www.qsl.net/4nec2/) can often help provide insight into antenna modifications and resulting performance.
A computer simulation of an antenna is an...
|
|
Forum: Antennas
22-Jul-2013, 6:13 PM
|
|
Replies: 121
Views: 1,170,893
Research Communications Preamp and Balun
Earlier, it had become apparent that sufficient gain (predicted 7dB above pair of YA-1713) to enable reception of WHAS-11 would be difficult to achieve.
To make most use of the available gain, a...
|
|
Forum: Antennas
19-Jul-2013, 1:23 AM
|
|
Replies: 121
Views: 1,170,893
Thanks Pete.
Glad you find the story...
Thanks Pete.
Glad you find the story interesting.
For the most part, kept handwritten logs, Excel files, and photos. Takes a bit of time to go back and put a 'hopefully' coherent story...
|
|
Forum: Antennas
18-Jul-2013, 5:49 PM
|
|
Replies: 121
Views: 1,170,893
Long Yagi for VHF (Ch 8-11)
Time: Summer/Fall 2010
Location: KY
Yagis (channel-cut for 10, Wade 10y10s) were used as raw material and a starting point in the design. Channel 10 was selected because it seemed a good...
|
|
Forum: Antennas
11-Jul-2013, 7:03 PM
|
|
Replies: 121
Views: 1,170,893
Half Wave Coaxial Baluns for VHF
Recalling the VHF antenna project objective:
To receive WHAS-11 and WBNA-8 located in Louisville KY.
TVfool report (both stations listed as 2-Edge):
Noise Margin Distance (miles)
...
|
|
Forum: Antennas
10-Jul-2013, 2:53 PM
|
|
Replies: 121
Views: 1,170,893
|
|
Forum: Antennas
5-Jul-2013, 1:48 PM
|
|
Replies: 121
Views: 1,170,893
Yes.
The signal strength of the combined...
Yes.
The signal strength of the combined stack was observed on a signal level meter while the lower antenna was moved up and down by approximately +/- 18 inches.
Interesting about Winegard...
|
|
Forum: Antennas
4-Jul-2013, 6:43 PM
|
|
Replies: 121
Views: 1,170,893
Sorry, don't have any photos that I know of. ...
Sorry, don't have any photos that I know of. Presently, I am not at the main tower site to take any photos.
Mostly use recycled antenna manufacturer clamps (the ones that come with antennas).
...
|
|
Forum: Antennas
4-Jul-2013, 6:18 PM
|
|
Replies: 121
Views: 1,170,893
The YA-1713 were mounted 43 inches apart.
...
The YA-1713 were mounted 43 inches apart.
This particular stack spacing provided highest signal strength for Channel 13, it will probably different for other channels. Best spacing will be...
|
|
Forum: Antennas
3-Jul-2013, 9:36 PM
|
|
Replies: 121
Views: 1,170,893
Test Transmitter - Crystal Oscillator
Returning to VHF antenna tests (http://forum.tvfool.com/showpost.php?p=36728&postcount=23), recall that an objective was to receive WBNA-8 and WHAS-11 from Louisville KY at distances of 70 and 101...
|
