Files by holl_ands (February 2, 2009)|
|Downloadable Files re On-The-Air Reception - by holl_ands|
Includes DTV Antenna Specs (and measured Performance), measured Balun Loss, measured RF Splitter Loss & RG-6 Cable Loss Specs.
Also includes ATSC/NTSC Tuner Specs and Preamp Specs, plus a DTV Signal Overload Calculator and a Third Order Intermod Calculator.
Smart Antenna Tests & Interior Photos (June 29, 2009)|
|DX Antennas DTA5000 and RCA ANT2000 Smart Antenna Tests and Interior Photos.|
On-Air test compares Smart Antennas to Hi-VHF Folded Dipole and Winegard YA-1713 10-Element Hi-VHF Yagi.
Omni & Quasi-Omni Directional Antennas (17 Dec 2011)|
|Omni-Directional Antennas analyzed using 4nec2, including a Hi-VHF Monopole Whip|
(see last album) and the following for FM Band:
FM WORST-to-Best Gain (dBi, all angles & freqs): HORIZONTAL VERTICAL TOTAL SWR (Impedance)
a) FM Vertical Folded Dipole (Vert. Pol.): minimal +1.7 to +2.6 +1.7 to +2.6 1-2.0 (300-ohms)
x) FM Biconical (Vert. Pol.): minimal +1.7 to +1.8 +1.7 to +1.8 2-3 (75-ohms)
b) FM Monopole Whip (Vert. Pol.): minimal +1.5 to +1.6 +1.5to +1.6 3-4.5 (75-ohms)
y) FM Discone (Vert. Pol.): minimal +1.4 to +1.4 +1.4 to +1.4 2-3 (75-ohms)
z) FM Flat-Swept SBGH (H-OMNI-PLUS): +4.5 to +7.5 minimal +4.5 to +7.5 2.3 (300-ohms)
s) FM TRIAD 4xRect-Loops (H-OMNI-PLUS) +3.3 to +4.1 minimal +3.3 to +4.1 3.0 (300-ohms)
c) FM Double-Hoop (Horiz. Pol.): -2.1 to +1.3 minimal -2.1 to +1.3 6-11 (300-ohms)
d) FM Goalkeeper Quad-Trapezoid (H-Pol) -99 to +3.1 minimal -99 to +3.1 2.7 (300-ohms)
t) FM TRIAD Array of Dipoles, H-OMNI +0.3 to +1.6 minimal +0.3 to +1.6 2.6 (300-ohms)
e) FM Turnstile (Horiz. Pol.): -33 to +1.4 minimal -13 to +1.4 1.5-3.0 (300-ohms)
f) FM Turnstile Rotated (Horiz. + Vert. Pol.): -33 to +0.1 -1.6 to +0.7 -1.6 to +2.3 3.5-1.5 (300-ohms)
g) FM Double-Hoop + Vertical-Dipole Outside: -12 to +1.0 -13 to +1.9 -1.9 to +2.1 1-5 (75-ohms)
h) FM Double-Hoop + Vertical-FD Outside: -3.9 to +1.2 -22 to -1.4 -2.3 to +1.8 6.4-6.8 (300-ohms)
i) FM Double-Hoop + Vertical-Dipole In Center: -5.9 to +0.9 -9.4 to +1.5 -1.2 to +2.4 2.6-6 (300-ohms)
j) FM Double-Hoop + Vertical-FD In Center: -5.2 to +0.8 -10 to +1.2 -1.8 to +2.3 2.2-7.2 (300-ohms)
k) FM Double-Hoop with Vertical Whip: -3.7 to +1.2 -53 to -4.6 -3.2 to +1.9 5.1-7.1 (300-ohms)
l) FM ESS-Curve (similar to Fracarro ANT1200A): -4.4 to -1.4 -34 to +0.1 -4.4 to +2.5 1.3-2.7 (300-ohms)
m) FM ESS-Curve (similar to Dipol A0222+A0223): -5.1 to -1.9 -36 to +0.4 -5.1 to +2.4 1.3-2.5 (300-ohms)
n) FM ZigZag (similar to Triax FM Zigma): -39 to -1.7 -1.5 to -0.7 -1.5 to +2.4 1.7-3.7 (300-ohms)
o) FM ZigZag (Cir. Pol. Forward & Back): -37 to -1.1 -2.5 to -0.4 -2.5 to +2.3 1.7-3.7 (300-ohms)
p) FM Folded Dipole Pair (Cir. Pol. Fwd & Back): -31 to +1.7 -6.7 to +1.1 -6.6 to +2.3 1.3-1.7 (300-ohms)
First group (a, x, b, y) are Omni ONLY for Vertical Polarization. Whip has a flatter Gain curve but higher SWR.
Vertical Folded Dipole has excellent SWR with only a small Gain variance across all angles and frequencies.
Second group (z, s-t, c-e) are Omni ONLY for Horizontal Polarization.
Flat-Swept SBGH has Highest Performance. Double-Hoop has flat Gain curve but high SWR.
Goalkeeper and Turnstile Azimuthal Patterns are Bi-Directional "Quasi-Omni", however Turnstile's Azimuthal
Pattern is along a Diagonal, with deep nulls along the opposite Diagonal.
Third group (f-j) respond to both Vertical and Horizontal Polarization, however there is moderate Gain Loss
on some angles and frequencies. All exhibit high SWR.
Fourth group (k-m) respond to both Vertical and Horizontal Polarization, however there is severe Vertical Gain
Loss on some angles and frequencies. ESS-Curve (similar to Fracarro ANT1200A) is slightly better than Dipol.
Fifth group (n-p) respond to both Vertical and Horizontal Polarization, however there is severe Horizontal Gain
Loss on some angles and frequencies. FM ZigZag (similar to Triax FM Zigma) is slightly better.
For Circular Polarization Forward & Rear, Folded Dipole Pair is best choice.
Bowties, Dipoles, Batwings & Rhombics (March 8, 2010)|
|Bowties, Dipoles, Batwings & Rhombics (Oh My!!!) analyzed using 4nec2.|
"VEE" shaped Rabbit Ears are analyzed in the Circular Polarization Folder.
EDIT (17 Dec 2011): Monopoles moved to NEW Omni-Directional Antenna Folder.
Slot Antennas (Aug 29, 2015)|
|Slot Antennas Antennas Analyzed using 4nec2.||3 Albums|
Loop Antennas incl Folded Dipole (July 15, 2009)|
|Folded Dipoles, Tri-Folded Dipoles, Square Loops (incl. HenTenna), Circular Loops, Figure-8, Hourglass, Quad-Trapezoid,|
Shorted-Bowtie-Loops (SBL), Bowtie-In-Loops (BIL) and Dreamcatcher, et. al. analyzed using 4nec2
Multi-Bay Hourglass-Loops (19 Nov 2014)|
|Multi-Bay Hourglass-Loops and Quad-Trapezoid Antennas analyzed using 4nec2.||3 Albums|
Multi-Bay Bowtie Antennas (August 17, 2009)|
|2-Bay, 3-Bay, 4-Bay, 6-Bay and 8-Bay Bowtie Antennas (with and without Reflector) analyzed using 4nec2.||24 Albums|
Multi-Bay Dipole Antennas (4 Jun2012)|
|Multi-Bay Dipole Antennas analyzed using 4nec2.|
4-Bay and 8-Bay Dipole Antennas (with and without Reflector) analyzed using 4nec2.
Colinear Dipole Arrays (3 Mar 2012)|
|Colinear Dipole Arrays analyzed using 4nec2, including antique Finco 400 types.||2 Albums|
Bi-Quad Antennas (19 Aug 2011)|
|Bi-Quad Antennas, including Double Bi-Quad and Bi-Quad Yagis analyzed using 4nec2.|
Note that the outer tips of a Bi-Quad connect to each other.
Chireix antennas are similar, but with a GAP at the tips.
Also note that the Feedpoint Gap is between the two Zig-Zag Elements,
running Horizontal for Horizontally Polarized Antennas as shown here.
Hence the Overall Antenna is taller than it is wide, unlike an Enclosed Bowtie.
Multi-Diamond Antennas (30 Apr 2013)|
|Multiple Diamond Analyzed using 4nec2. Similar to Bi-Quad, except with additional Diamond shaped sections.||4 Albums|
Chireix, StealthHawk & V-Hawk Zig-Zags (August 17, 2009)|
|Chireix Zig-Zag Antenna as well as StealthHawk & V-Hawk derivatives analyzed using 4nec2. |
Chireix Antenna is a pair of Zig-Zag shaped wires parallel to each other, which are only interconnected via a 4:1 Balun.
Gray-Hoverman Antennas (January 30, 2009)|
|Original Hoverman variations, incl Antennacraft G-1483 and Radio-Shack 15-1627,|
SBGH (Single Bay Gray-Hoverman) and DBGH (Double Bay Gray-Hoverman)
analyzed for Hi-VHF and UHF performance using 4nec2.
I have avoided replicating G-H results found elsewhere. Much more info can be found here:
http://clients.teksavvy.com/~nickm/index.html [nikiml's Optimized Grey-Hoverman & Stealthawk]
http://www.digitalhome.ca/forum/showthread.php?t=121956 [Hi-VHF & UHF Grey-Hoverman]
Some DIY websites:
http://www.digitalhome.ca/forum/showthread.php?t=95898 [300-ohm's DIY G-H thread]
http://mysite.verizon.net/res11d41p/id2.html [UHF SBGH-6 + Hi-VHF NARODS]
https://sites.google.com/site/maycreates/ota-setup/my-sbgh [Mayhem Creation's DIY G-H]
http://www.diytvantennas.com [Chris Dahl's DIY G-H]
http://www.instructables.com/id/Gray-Hoverman-TV-Antenna-Final-Assembly/?ALLSTEPS [unclesam's DIY G-H]
http://community.9wsyr.com/blogs/plugged_in_the_dtv_switch/archive/2008/05/27/3046816.aspx [DBGH by JHEngineering for WSYR]
http://www.casano.com/projects/hoverman/index.html [Wm F Dudley Jr's DIY Stacked DBGH]
http://www.youtube.com/watch?v=YaYDtOqpTOI [Even kidz can do it.....]
http://techorator.blogspot.com/2013/04/homemade-20-super-antenna-out-of-paper.html [nikiml's Hi-VHF/UHF GH0 using Foil Tape on Cardboard]
Yagi Antennas (June 19, 2009)|
|Hi-VHF 3, 4, 5, 6, 7, 8, 9, 10, 12, 13, 16, 18, 20 and 22-Element Yagi Antennas performance analyzed using 4nec2.|
UHF 2, 3, 5, 6, 7, 8, 12, 13, 15, 16, 18, 23-Element and 91XG (23-Element + Corner Reflector) Yagi Antennas
performance analyzed using 4nec2.
Nearly ANY Antenna Design can be Rescaled to dimensions appropriate for another Band (incl. Wi-Fi).
To Rescale a New UHF Band Antenna (if peak on CH51) to center of 2.400-2.485 GHz Wi-Fi Band,
shrink ALL Dimensions (incl. wire size) by the Rescale Factor = 698/2442.5 = 0.2858. Invert
ratio to enlarge a design for a lower frequency Band. Reoptimize, if necessary, esp. if change
to a "standard" sized element diameter.
BOOM CORRECTIONS: Most NEC Yagi models intentionally leave out the Metallic Boom
since it requires many more segments that greatly slow down the simulation
[and from what I've attempted, provide indeterminate results..maybe I need NEC4 Engine].
To compensate for the missing Boom, 4nec2 optimized dimensions for Element Length
must be INCREASED by the amount of the BOOM CORRECTON when cutting actual Metal.
Note that the amount of Boom Correction varies, depending on whether Insulated
or Bonded to the Boom and derated (reduced) for being on TOP and if Isolated ABOVE or
BELOW the Boom, which explains why there is usually NO BC for Active Elements.
Boom Corrections are NOT needed if using a non-metallic boom (e.g. wood or fiberglass).
UHF 13-El FD-Yagi (2RR) webpage contains Spread Sheet Boom Correction Calculation
Examples, based on a variety of references sources (note disagreements).
For a 1-in Boom (Circular or Square), the extra Passive Element Half-Length is 0.25-in or LESS,
and for a 1/2-in Boom, the Boom Correction is only 0.1-in or LESS. Element Size did not matter.
Hi-VHF YA-1713 10-El Log-Yagi webpage contains Boom Correction Calculator Spread Sheet
example that can be used for other antennas. Includes References and explanations:
Bi-Directional Yagis (4 Jul 2016)|
|BI-DIRECTIONAL YAGIS analyzed using 4nec2.||1 Albums|
Log-Yagi & Dual-Driven Antennas (25Jan2011)|
|Log-Yagi and Dual-Driven Antennas analyzed using 4nec2:|
a) FM Band, Antennacraft FM-6, 6-Element Log-Yagi.
b) Wade-Delhi C-101-5 10-element Ch3-5 Log-Yagi, 148-inch Boom.
c) Winegard YA-1713, 10-element Hi-VHF Log-Yagi, 98-inch Boom.
d) Antennacraft Y10-7-13, 10-element Hi-VHF Dual-Driven Yagi, 120-inch Boom.
e) Antennacraft Y10-2-6, 10-element Ch2-6 [+ 7-13] Log-Yagi, 147-inch Boom.
LPDA + ZigZagLPA Antennas (December 23, 2008)|
|LPDA (Log Periodic Dipole Array) and Zig-Zag LPA (Log Periodic Array) Antenna performance analyzed using 4nec2.||7 Albums|
Parabolic Antennas (17 Nov 2012)|
|Parabolic Antennas analyzed using 4nec2 (excluding Circular Polarized).||8 Albums|
Quasi-Parabolic Antennas (21 Mar 2013)|
|UHF Quasi-Periodic (KISS) with Flat Panels approximating a Parabolic Reflector + Various Feed Antennas analyzed using 4nec2.||3 Albums|
Circular Polarized incl. Rabbit-Ears (9 Feb 2001)|
|Circular Polarized Antennas analyzed using 4nec2.|
Circularly Polarized signals are broadcast with a 90-deg phase shift between the Horizontal and Vertical
Polarization components. When Right Hand Circular Polarized signals are transmitted, a RHCP Antenna SHOULD
suppress LHCP (multipath) signals, since rotation changes upon reflection from buildings, bridges & terrain:
Some stations chose to transmit Elliptically Polarized signals, with reduced power in either Horizontal
or (more likely) Vertical component....probably to save money, esp. reducing monthly power bill:
a) Simple Rabbit Ears in "VEE" shape.
b) Goalkeeper Quad-Trapezoid+Spurs
c) Crossed Dipoles.
d) Offset Crossed Dipoles
e) Crossed Yagis
f) Offset Crossed Yagis
g) Helical (Axial-Mode).
h) Circularly Polarized 5-Blade Fan.
FM Cycloid Dipole is also Circular Polarized, providing good suppression of LHCP, but the SWR is very Excessive:
Curtain Quad Antennas (August 5, 2009)|
|Curtain Quad Antenna Arrays analyzed using 4nec2.||5 Albums|
Stacked Antennas (March 4, 2010)|
|Stacked Antennas analyzed using 4nec2 to determine:|
1. Minimum tolerable separation for some "typical" vertically stacked UHF and Hi-VHF antennas.
2. Optimum stacking distance for matched antennas: http://www.grantronics.com.au/docs/StkYagis.pdf
Also see Cebik's article (FREE registration required): http://www.cebik.com/content/a10/yagi/stacksup.html
Not For TV - Too Narrowband (July 26, 2009)|
|Misc Antennas analyzed using 4nec2 that are NOT suitable for TV bands.|
Includes Yet Another UTube Defect, Bruce Arrays, Sturba Curtains and Joe Carr's Six-Shooter Array.
Amateur Radio Antennas (October 8, 2015)|
|A few noteworthy Amateur Radio Antennas analyzed as they came up in Forum conversations.....||4 Albums|
CES2009 (9-10 Jan2009)|
|Highlights of Consumer Electronics Show 2009 in Las Vegas.||16084 Visits|
2007 Jul 12 to Aug 3 - BC, WA and OR (Jul 23 to Aug 3, 2007)|
|Spruce Goose. Victoria, Squamish/Whistler and Vancouver, BC. Glass Art Museum at Tacoma, WA.|
Mt Olympia, Mt Rainier, Mt Saint Helens, Mt Hood, Crater Lake, Mt Shasta
Click on Thumbnails to see 1024x768 Images. Double-Click on Images to see HI-REZ.
As usual, Click on "X" to Exit Windows.
Partial Solar Eclipse from San Diego, CA (20 Mar 2012)|
|Partial Solar Eclipse from Sycamore Canyon Reserve Park, San Diego, CA (just south of Scripps-Poway Parkway on SR67).|
Next Event: Transit of Venus across the face of the sun.