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UHF Hourglass Loop
16. UHF Hourglass Loop  (30 Nov 2012)
UHF Hourglass Loop analyzed using 4nec2 after finding "best" dimensions using nikiml's Optimizations Scripts.
Based on UHF Hourglass Loop posted by oneolddude in www.digitalhome.ca forum.
However Optimization and Rescaling increased 470 MHz Gain by about 0.5 dB with Max Gain on 698 MHz.

Five versions are analyzed here.  ALL provide very wide Beamwidths (60-50 degrees even at High Freqs):

#############################################
a) AWG6 with NO Reflector Rods (Optimization search across ALL THREE Variables):
UHF Raw Gain = 4.7-6.0 dBi with Excellent SWR under 1.6, using AWG6.

#############################################
b) AWG10 Elements + 1/4" 12x Reflector Rods (Optimization search across ALL THREE Variables):



#############################################
c) AWG6 Elements + 1/4" 15x Reflector Rods (Search across ALL SIX Variables):
UHF Raw Gain = 9.6 to 10.4 to 10.3 dBi, F/B & F/R Minimum = 19.6 dB and  SWR (300-ohms) Under 1.8.

#############################################
d) AWG12 Elements + AWG12 15xReflector Rods:
UHF Raw Gain = 9.4 to 10.2 dBi, F/B & F/R Minimum = 17.1 dB and SWR (300-ohms) Under 1.8.

#############################################
e) Grid Mesh 24x19.5-in (per 300-ohm post):
UHF Raw Gain = 9.4-10.8 dBi with SWR under 2.4, using AWG6.
Front/Back and Front/Rear Ratios 15 dB or better.

#############################################
f) Grid Mesh 24x19.5-in (Re-Optimized using nikiml's Python scripts):
UHF Raw Gain = 9.5-10.6 dBi with SWR under 2.5, using AWG6.
Front/Back and Front/Rear Ratios 17 dB or better.

PS: For improved F/B and F/R Ratios, should try different Grid Mesh sizes.

EDIT (10Dec2012): Added 4nec2 analysis with Grid Mesh (per 300ohm post) and
Re-Optimized version, with somewhat better F/B and F/R Ratios.

EDIT (10Jul2014): Replaced 15xRR version with improved SWR version (with 0.2 drop in Gain).

EDIT (8Mar2015): Added 11RR version.
3909 Visits
81 Images
Linked Album
holl_ands
UHF H2 2-Bay Bowties + Various Refl Rods
17. UHF H2 2-Bay Bowties + Various Refl Rods  (4 Mar 2015)
UHF H2 (10.5x12.25) 2-Bay Bowtie with 11 Reflector Rods analyzed using 4nec2 after determining
dimensions using nikiml's Python Optimization Scripts.

UHF Raw Gain = 11.7 to 13.8 dBi, F/B & F/R Ratio Min. = 18.8 dB and SWR (300-ohms) Under 2.6.
Hi-VHF Raw Gain = 7.9 to 7.8 to 7.9 dBi, F/B & F/R Ratio = 9.8 to 15.6 dB and SWR (300-ohms) = 75 to 24.

OPTIMIZED DIMENSIONS:
BowLength = 10.5-in = Whisker Length,
BowSpacing = 12.25-in = Separation between Bowties,
TineSep = 6.0-in = Tine Separation Tip-to-Tip,
FeedSep = 2.5-in = Feedline Separation,
Element & Feedline Wire Size = AWG10,
Reflector Rod Wire Size = QICT (Quarter-Inch Copper Tubing) [Could be thinner],
RS = 5.0-in = Reflector Rod Separation behind Hourglass,
RR = 2.25-in = Reflector Rod-to-Rod Separation,
YRod = 17.0-in = Reflector Rod Half-Lengths.
218 Visits
21 Images
Linked Album
holl_ands
UHF Quad-Trapezoid-Loop+2xBars
18. UHF Quad-Trapezoid-Loop+2xBars  (11 Jul 2014)
UHF Quad-Trapezoid-Loop+2xBars
UHF Quad-Trapezoid-Loop + 2 Bar Elements analyzed using 4nec2.
Formed by adding outer parts of Chireix 2-Square Antenna to an Hourglass-Loop.
All dimensions determined using nikiml's Optimization Scripts:

Two versions analyzed: Quad-Trap+2xBars (NO Reflector) and Quad-Trap+2xBars (15 RR).

=================================================
a) Quad-Trapezoid-Loop+2xBars (NO Refl): AWG10 Elements.

UHF Raw Gain = 6.6 to 9.4 dBi, SWR (300-ohms) under 1.8 and Beamwidth = 80 to 50-degrees.

=================================================
b) Quad-Trapezoid-Loop+2xBars + 11 Reflector Rods: AWG10 Elements and 1/4-in O.D. Reflector Rods.



=================================================
c) Quad-Trapezoid-Loop+2xBars + 15 Reflector Rods: AWG10 Elements and 1/4-in O.D. Reflector Rods.

UHF Raw Gain = 11.4 to 12.6 to 11.1 dBi, F/B & F/R Ratio Min = 18.1 dB and SWR (300-ohms) under 2.5.
Note 60-50 degree Beamwidth and EXTREMELY DEEP 64+ dB Notch directly to Rear.
5178 Visits
51 Images
Linked Album
holl_ands
UHF "Figure-8" Twin-Loops + 11RR - OPT
19. UHF "Figure-8" Twin-Loops + 11RR - OPT  (6 Mar 2015)
UHF "Figure-8" Twin-Loops + 11 Reflector Rods analyzed using 4nec2 after determining
dimensions using nikiml's Python Optimization Scripts.

UHF Raw Gain = 9.7 to 10.9 dBi, F/B & F/R Ratio Min. = 18.1 dB and SWR (300-ohms) Under 2.2.
221 Visits
21 Images
Linked Album
holl_ands
20. UHF H2 2-Bay Bowties - Var. Refl.  (6 Mar 2015)
UHF H2 2-Bay Bowtie with 11 Reflector Rods analyzed using 4nec2 after determining dimensions using nikiml's Python Optimization Scripts.
8 Visits
0 Images
Linked Album
holl_ands
UHF 2-Bay SOLID Triangles - Var RR's
21. UHF 2-Bay SOLID Triangles - Var RR's  (4 Mar 2015)
UHF 2-Bay SOLID Triangles (and Other Shapes) with Various Reflector Rods analyzed using 4nec2
after determining dimensions using nikiml's Python Optimization Scripts.

Several versions were analyzed: SOLID Triangles, SOLID FAT Triangles and SOLID Hexagon with
Optimized (PENNANT) Shape.

a) SOLID Triangles:


b) SOLID FAT Triangles:


c) SOLID Hexagon with Optimized (PENNANT) Shape:
285 Visits
69 Images
Linked Album
holl_ands
ANH Senate Princess Leia
22. ANH Senate Princess Leia  (March 16, 2007)
This is my Princess Leia Version 4.  My first 3 were sold because I was not totally happy with the end result (size, fabric choices, etc).

Jet Set Poly from Joann.com - $2.79/yd at 10 Yards
Leather for Belt - $15 (enough for 4 belts though)
Aluminum Sheeting for belt plates - free
Buttons for belt plates - $0.50 each at 7 buttons
Snaps for Belt - appx $0.50 each at 4 snaps
Total Cost -$50 approximately

Jet Set Poly from Joann.com
http://www.joann.com/catalog.jhtml?CATID=96027&PRODID=122901&source=search

Leia Belt Tutorial from Jedi-Academy
http://www.jedi-academy.com/leia_anh_belt.html


My poor attempt at how I made this dress
I made the dress without any commercial patterns since it's easy enough.

I laid out 9 yards of fabric double folded on itself (4 layers) and then folded it in half from neck to floor hem (so that the right and left sides would be mirrored).  

I then drew out the shape of the dress and sleeve.  I pinned all the layers together so there wouldn't be any shifting when I was cutting, and then cut it out.  

I then opened it all up, pinned the two really long layers together (NOT at the neck though - you need this open to turn the dress right-side out), and sewed all the edges.  

The dress was then turned right-side out through the neck opening, and the seams were ironed flat.

I then laid out the dress folding it along the top of the sleeves (so there wouldn't be any seams on the top of the dress) so the sides and floor hem matched up.  I then pinned it in place leaving the slits on the sides open and sewed it together.

The collar was easy, it was made as long as my neck is around (12.5"), and about 7" high, fodl the collar in half length-wise and sew the ends (short sides) shut.  Turn this right-side out and iron flat.

The 'hood' was made about 16" wide and 36" long.  I did a rolled hem along the long edges before sewing it to the dress.  
I then gathered the short ends to about 4" in length and sewed them in place along the edges (to keep the gathers from moving while sewing it to the dress).

I stay-stitched the edge of the neckline on the dress and then layered the dress, hood, and collar in place.  These were pinned and then sewn.

For the gathers in the front of the dress I used a smocking stitch to keep them in place.  These are hidden under the belt while the dress is worn.

EDIT: Version 4 of the dress.  The top and bottom sections have a waist seam because my arms are too long to use the fabric selvage edge to edge.
There is elastic sewn to the waist to give instant gathers, this is all hidden at the natural waist by the belt.  This version fits so much better than the old one.  The sleeves are finally long enough and the hem is at the perfect length after blousing the waist over the belt a little.

The belt was made using the Obi-Wan's Jedi Academy tutorial (see link above).
5927 Visits
42 Images
Linked Album
benaequee
The Orchard
23. The Orchard  (Take the camera for a walk ...)
Hi,
My name is Heinz and I moved in here mid January. I am a photographer and took my camera for a walk around 'The Orchard' complex shooting a few pictures here and there, porches, doors, exterior of windows, plantings, and various decorations offered to the observant eye.

When you click on a photo a larger version opens up, or you can select the slide show and it lets you wander through the complex one picture at a time.

I invite you to take the walk with me through the pictures I shot on February 25, 2015 shown here. If I captured something of yours, or merely something you like, you are free to download it. If you need a high resolution digital copy or prints leave a message here or contact me through the E-mail address below.

If you would like to improve your skills of taking photos, or photo editing let me know at:

HeinzPhoto@aol.com

we can work something out privately or through the Activities Director if sufficient interest justifies it.
161 Visits
213 Images
Linked Album
heinz57
24. H+U 2-Bay + Rect. Loop (RLH2) - NO Refl  (12Feb 2015)
Hi-VHF + UHF 2-Bay Bowtie (RLH2) with Co-Planar Rectangular Hi-VHF Resonator Loop (No Reflector) analyzed using 4nec2
after ALL Dimensions determined using nikiml's Python Optimization Scripts.

The Resonator Loop greatly improved Hi-VHF SWR and hence Net Gain.
0 Visits
0 Images
Linked Album
holl_ands
25. UHF H2 2-Bay Bowtie Screen Reflector  (9 Feb 2015)
UHF H2 2-Bay Bowtie with Screen Grid Reflector Analyzed using 4nec2.
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0 Images
Linked Album
holl_ands
UHF H2 2-Bay Bowtie - No Reflector
26. UHF H2 2-Bay Bowtie - No Reflector  (8 Feb 2015)
UHF H2 2-Bay Bowtie with No Reflector, OPTIMIZED for New UHF Band using nikiml's
Python Optimization Scripts.

UHF Raw Gain = 7.3 to 10.3 dBi with SWR (300-ohms) under 3.0 (Good).
Hi-VHF Raw Gain = 2.4 to 2.8 dBi with SWR (300-ohms) = 12.4 to 6.7 is Excessive.

Note the significant improvement of H2 compared to either M2 versions.

Dimensions:
ZBowII= 12.0 = Distance between the Centers of the two Bowties,
BowLen= 11.0 = Bowtie Whisker Half-Length,
TineSep= 8.0 = Bowtie Tine Separation,
FedSep= 1.25 = Separation (in inches) between two FEEDLINE wires.
224 Visits
20 Images
Linked Album
holl_ands
27. HiVHF+UHF 2-Bay WallTenna Enhancements  (2 Feb 2015)
Hi-VHF and UHF 2-Bay Bowtie (7.2x8.0-in) with No Reflector analyzed using 4nec2.
Dimensions came from Actual Measurements by on the WallTenna.

Three versions were analyzed: 1) As Built, 2) Add Whisker Extensions to improve UHF performance
and 3) Add Co-Planar Rectangular Loop Resonator to improve Hi-VHF Performance.

1) WallTenna As Built:



2) Add Whisker Extensions to improve UHF performance:



3) Add Co-Planar Rectangular Loop Resonator to improve Hi-VHF Performance.
0 Visits
0 Images
Linked Album
holl_ands
UHF M4 (9.5x9.0) 4-Bay+FLAT Grid at 16"
28. UHF M4 (9.5x9.0) 4-Bay+FLAT Grid at 16"  (27 Oct 2013)
UHF M4 (9.5"x9.0") with Flat Screen Grid Reflector analyzed using 4nec2.
Dimensions for Bowties are for mclapp's M4 using AWG8 per his website drawings.
There was no attempt was made here (yet) to jointly optimize Bowtie & Reflector dimensions.

Better for HiVHF: 40-in x 40-in Screen Grid (1"x2") Reflector located 16-in behind 4-Bay Bowties,
but higher SWR on lowest UHF Channels and Gain on higher UHF channels moves to +/- 25-deg,
resulting in reduced Forward Gain.
[An improved design should be investigated, reducing these UHF degradations.]

UHF Raw Gain = 13.7 to 14.5 to 9.8 dBi, F/B & F/R Ratio Min = 10.9 dB and SWR (300-ohms)
up to 4.5 on Ch14 and under 2.7 on Ch17 and above.
Hi-VHF Raw Gain = 8.0 to 7.7 dBi, F/B & F/R Ratio = 13-15 dB and SWR (300-ohms) under 3.2.

ERRATA (27Oct2013): Corrected labels and narrative (charts remain the same).
Separation between Reflector and Bowties for the two alternatives is actually 16-in (vice 17-in).
When defining nec file names, I overlooked -1 inch offset in the Bowties.
1240 Visits
21 Images
Linked Album
holl_ands
HiVHF+UHF 2-Bay+Loop - NO Reflector
29. HiVHF+UHF 2-Bay+Loop - NO Reflector  (27 Jan 2015)
Hi-VHF + UHF 2-Bay Bowtie plus Hi-VHF Rectangular Loop Resonator analyzed using 4nec2.

Two versions were analyzed: a) mclapp M2 (9.5x9.0) sized 2-Bay plus Rectangular Loop and b) Re-Optimized 2-Bay plus Rectangular Loop.

a) mclapp M2 (9.5x9.0) sized 2-Bay plus Rectangular Loop, where Loop is in the same plane and always OUTSIDE the 2-Bay.

b) Re-Optimized 2-Bay plus Rectangular Loop, with 0.5-in Offset between them to avoid overlapping wire collisions.
228 Visits
39 Images
Linked Album
holl_ands
Horiz-Stack 2xFF4 + DoubleAng Refl - RFC
30. Horiz-Stack 2xFF4 + DoubleAng Refl - RFC  (3 Jun 2014)
UHF+Hi-VHF HFF8, a Horizontal Stack of 2 ea Free-Form 4-Bays (FF4) with Double Angle Reflectors
(each 48" H x 36" W using 2x2-in Grid) were analyzed using 4nec2, presuming they are driven separately.
FF4 dimensions are sameas found for the Optimized version with
a Variable Double Angle Reflector.

Here the usual Horizontal Stacking approach is used, with Equal Length Coax to a (ZERO LOSS) RF Combiner.

Initially, 4nec2 Parameter Sweep plotted Raw Gain versus Horizontal Stacking Distance.
Since SWR plots were always excellent across the UHF Band, they are not shown here.

Performance was slightly "Better" at THREE notable Stacking Distances:
34.821-inches (NO GAP, Continuous Reflector), 35-inches (Metal-to-Metal about 1/4-inch)
and 51-inches, which are analyzed below.
There were notable Stacking Distances further out, but none were particularly "Better".

Although the differences are only a few tenths of a dB, Stack Distance = 51-inches was just
a bit "Better", esp. Hi-VHF, than at 35-inches.  The wider Separation may also be slightly
"Better" at combating Multipath Fading due to the reduction in Statistical Correlation
between the two Antenna signals.  The "NO GAP between Reflector" alternative was slightly worse.

===========================================
a) Horizontal Stacking Distance (4-Bay Center-to-Center) = 34.821 inches (NO GAP between Reflectors).

UHF Raw Gain = 17.2 to 19.7 dBi, F/B & F/R Ratio Minimum = 16.4 dB & SWR (300-ohms) under 2.1.
Hi-VHF Raw Gain = 10.4 to 9.9 to 10.3 dBi, F/R & F/B Ratio Min = 16.4 dB, although SWR (300-ohms)
under 20 dB is EXCESSIVE, which may or may NOT be an issue in any particular situation.

===========================================
b) Horizontal Stacking Distance (4-Bay Center-to-Center) = 35-inches (0.18-in GAP between Reflectors).

UHF Raw Gain = 17.3 to 20.1 dBi, F/B & F/R Ratio Minimum = 15.8 dB & SWR (300-ohms) under 2.1.
Hi-VHF Raw Gain = 10.5 to 11.7 to 11.9 dBi, F/R Ratio = 11.6 to 14.9 dB, although SWR (300-ohms)
= 24 to 15 dB is EXCESSIVE, which may or may NOT be an issue in any particular situation.

===========================================
c) Horizontal Stacking Distance (4-Bay Center-to-Center) = 51-inches (16.18-in GAP between Reflectors).

UHF Raw Gain = 17.6 to 20.3 dBi, F/B & F/R Ratio Minimum = 14.2 dB and SWR (300-ohms) under 2.1.
Hi-VHF Raw Gain = 13.5 to 11.4 dBi, F/R Ratio = 9 to 19 dB, although SWR (300-ohms) = 29 to 22 dB
is EXCESSIVE, which may or may NOT be an issue in any particular situation.
425 Visits
69 Images
Linked Album
holl_ands
 
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