A 40M l/4 Vertical with Elevated Radials
|
|
|
- Audra Todd
- 7 years ago
- Views:
Transcription
1 A 40M l/4 Vertical with Elevated Radials Easy to construct and raise by one person Larry Banks, W1DYJ First licensed: 1962 (KN1VFX) W1DYJ since 1966 Amateur Extra 10 Matthews Way Harpswell ME 33 Blueberry Hill Road Woburn MA Presented to YCCC, December 2014
2 Contents Background Original 40M Dipole Why a Vertical? The Design 40M Results 15M Results Appendix Page 2
3 Contents Background Page 3
4 My Philosophy Station KISS Do It Myself Believe in Modeling Easier than Building Contesting SOLP Only Blame Myself $10K Rig QRO Towers & Stacks W1DYJ Experience & Wisdom Decent Rig & Antennas Page 4
5 Maine Location N Japan 335 N Oceana 270 House House Europe ~60 Africa 90 South America 170 Page 5
6 US from MA Elevation Statistics for New England 40M (From HFTA) Europe Africa 3-11 Japan 1-11 Oceana 1-6 S. America 4-20 Page 6
7 Contents Background Original 40M Dipole Page 7
8 Original 40M dipole Simple Fan Dipole for 80, 40, 20 Using a corner of the house as the center point Deck Europe ~60 Deck (The numbers on the wires are for use with EZNEC.) Page 8
9 O W1DYJ Original 40M dipole: Limitations: Azimuth J N A E Azimuth Gain 20 El 60 (Europe) dbi 90 (Africa) (S. America) (Oceana) (Japan) House House Elevation SA House EZNEC Plots do not take into consideration the effect of being so near the house. House House Azimuth Page 9
10 O W1DYJ Original 40M dipole: Limitations: Elevation J N A E Azimuth Gain 20 El 60 (Europe) dbi 90 (Africa) (S. America) (Oceana) (Japan) House House Elevation SA Azimuth House House Elevation 60 Azimuth dbi Freq MHz. SWR EZNEC MEASURED Coax feed: 35 of RG8x ~ MHz Page 10
11 Contents Background Original 40M Dipole Why a Vertical? Page 11
12 Why a Vertical? Towers? Higher Dipoles? Remembering the KISS principle and Do It Myself No Tall Trees No High Dipoles ¼λ Vertical An easy to build resonant antenna with a low elevation angle One person can build, erect, and test Half of the dipole All parts are transportable in/on my car Negatives No gain or F/B Omnidirectional Potentially noisy Radials? Where and How Many? The other half of the dipole Page 12
13 Radial Choice From the ARRL Antenna Book: Practical Suggestions For Vertical Ground Systems At least 16 radials should be used if at all possible. Experimental measurements and calculations show that with this number, the loss resistance decreases the antenna efficiency by 30% to 50% for a 0.25 wavelength vertical, depending on soil characteristics. In general, a large number of radials (even though some or all of them must be short) is preferable to a few long radials for a vertical antenna mounted on the ground. The conductor size is relatively unimportant as mentioned before: #12 to #22 copper wire is suitable. If you install only 16 radials they need not be very long lambda is sufficient. If you have the wire, the space and the patience to lay down 120 radials (optimal configuration), they should be 0.4 lambda long. This radial system will gain about 3 db over the 16-radial case. If you install 36 radials that are 0.15 lambda long, you will lose 1.5 db (¼ s-unit) compared to the optimal configuration. Page 13
14 Radial Choice From the ARRL Antenna Book: Practical Suggestions For Vertical Ground Systems At least 16 radials should be used if at all possible. Experimental measurements and calculations show that with this number, the loss resistance decreases the antenna efficiency by 30% to 50% for a 0.25 wavelength vertical, depending on soil characteristics. In general, a large number of radials (even though some or all of them must be short) is preferable to a few long radials for a vertical antenna mounted on the ground. The conductor size is relatively unimportant as mentioned before: #12 to #22 copper wire is suitable. a. If you install only 16 radials they need not be very long lambda is sufficient. b. If you have the wire, the space and the patience to lay down 120 radials (optimal configuration), they should be 0.4 lambda long. This radial system will gain about 3 db over the 16-radial case. c. If you install 36 radials that are 0.15 lambda long, you will lose 1.5 db compared to optimal configuration. From QST, March 2010, pp 30-33: An Experimental Look at Ground Systems for HF Verticals (and references) Rudy Severns, N6LF four elevated radials at a height of 48 inches are within 0.2 db of 64 radials lying on the ground. Page 14
15 Radial Choice From the ARRL Antenna Book: Practical Suggestions For Vertical Ground Systems At least 16 radials should be used if at all possible. Experimental measurements and calculations show that with this number, the loss resistance decreases the antenna efficiency by 30% to 50% for a 0.25 wavelength vertical, depending on soil characteristics. In general, a large number of radials (even though some or all of them must be short) is preferable to a few long radials for a vertical antenna mounted on the ground. The conductor size is relatively unimportant as mentioned before: #12 to #22 copper wire is suitable. a. If you install only 16 radials they need not be very long lambda is sufficient. b. If you have the wire, the space and the patience to lay down 120 radials (optimal configuration), they should be 0.4 lambda long. This radial system will gain about 3 db over the 16-radial case. From QST, March 2010, pp 30-33: An Experimental Look at Ground Systems for HF Verticals (and references) Rudy Severns, N6LF four elevated radials at a height of 48 inches are within 0.2 db of 64 radials lying on the ground. Assume four elevated radials high enough to be safe: ~10 ft c. If you install 36 radials that are 0.15 lambda long, you will lose 1.5 db compared to optimal configuration. Page 15
16 Contents Background Original 40M Dipole Why a Vertical? The Design Page 16
17 EZNEC Modeling ~ Lots of Models! Simple Wires: 2 8 V = R = 34, 34.5, 34.7 Simple Wires: V = R = 34.7 Radial H = Simple Wires: V = R = Ground = Sandy, Average, Very Good Simple Wires: V = R = Number of Radials = 2, 4, 8 Simple Wires: V = R = Number of Radials = 2, 4, 8 Al tubing 4 35 / 10 V = 34, 35.5, 35 Al / 10 With / Without Al mast Al / 10 Radials with & w/o insulation Slide included in appendix Page 17
18 The First Design 1/4 dia 6¾ 45 3/8 dia 6 ¾ 1/2 dia 4½ 5/8 dia 2½ 3/4 dia 2½ 7/8 dia 2½ 1 dia 2½ 1 1/8 dia 2½ 1 1/4 dia 2½ 1 3/8 dia 2½ Acrylic Rod 1 ¼ x Radial Wire #14 33½ 10 PVC 2 Sched40 Page 18
19 The First Design 35 vertical 1/4 6¾ 3/8 6 ¾ 28.5 Tree Hose clamp for active lead Radial Plate 1/2 4½ 5/8 2½ 3/4 2½ 7/8 2½ 1 2½ Acrylic rod Resin Support Block 3 2x4 (2) Guy struts attached with ¼ x 20 SS bolts to (2) 1/8 x 1 Al angle 6 long. Attached to mast with hose clamps ~10 Pivot secure Cap screw into tree Guy struts 1 1/8 2½ 1 1/4 2½ 1 3/8 2½ Acrylic Rod 1 ¼ x Radial Wire #14 THHN 10 Mast 2 sked 40 PVC ~2 5/16 dia 1 ¼ pipe 1 ¼ Floor Flange Paver base ~6 Tree (4) 6 spikes into ground for stability 10 PVC 2 Sched40 Page 19
20 The First Design 1/4 6¾ 3/8 6 ¾ Hose clamp for active lead vertical Radial Plate 1/2 4½ 5/8 2½ 3/4 2½ 7/8 2½ 1 2½ Acrylic rod Resin Support Block 3 2x4 (2) Guy struts attached with ¼ x 20 SS bolts to (2) 1/8 x 1 Al angle 6 long. Attached to mast with hose clamps Pivot ~10 secure Cap screw into tree Guy struts 1 1/8 2½ 1 1/4 2½ Mast 2 sked 40 PVC 1 ¼ close ~2 5/16 dia pipe ~6 Tree 1 3/8 2½ ¼ Floor Flange base Acrylic Rod 1 ¼ x 3 10 PVC 2 Sched40 Radial Wire #14 THHN (4) 6 spikes into ground for stability Page 20
21 The First Design Hose clamp for active lead vertical To Garage Guy struts Driven Element / Radial mounting detail Tree To Tree Acrylic rod Pivot Radial Plate Mast 2x4 Acrylic Resin Support Block 3 2x4 ~10 secure Cap screw into tree To Tree To Tree Element Block (2) Guy struts attached with ¼ x 20 SS bolts to (2) 1/8 x 1 Al angle 6 long. Attached to mast with hose clamps Guy struts 10 Mast 2 sked 40 PVC 1 ¼ close ~2 5/16 dia pipe 1 ¼ Floor Flange base ~6 (4) 6 spikes into ground for stability Tree Common Mode Choke Page 21
22 The First Design Too Flimsy! 1/4 6¾ 3/8 6 ¾ 1/2 4½ 5/8 2½ 3/4 2½ 7/8 2½ 1 2½ 1 1/8 2½ 1 1/4 2½ 1 3/8 2½ Page 22
23 EZNEC Modeling ~ More Models! Simple Wires: 2 8 V = R = 34, 34.5, 34.7 Simple Wires: V = R = 34.7 Radial H = Simple Wires: V = R = Gnd = Sandy, Avg, Very Good Simple Wires: V = R = Number of Radials = 2, 4, 8 Simple Wires: V = R = Number of Radials = 2, 4, 8 Al tubing, first design 4 35 / 10 V = 34, 35.5, 35 Al tubing, first / 10 With / Without Al mast Al tubing, first / 10 Radials with & w/o insulation New, Stronger Al tubing/ 4 10 R = 34, 33.5 V = 35, 34.5 (4 cases) New, Stronger Al tubing/ 4 10 / 33.5 V = 35 6, 35, 35 4 New, Stronger Al 35 4 / 4 10 / 33.5 Gnd = Sandy, Avg, Very Good Slide included in appendix Page 23
24 The Final Design 35 4 Cap: for 3/8 tubing 1/ / / / / / /8 6 Weep hole Page 24
25 The Final Design One Person Design / / / / / / /8 6 Page 25
26 Contents Background Original 40M Dipole Why a Vertical? The Design 40M Results Page 26
27 O W1DYJ EZNEC model 40M l/4 vertical SA J N A E Azimuth Gain 20 El Max dbi Min M MODEL (vs. reality): 35 4 graduated Al pole (no tree) 4 elevated 10 (not real ) Very Good (and consistent) ground Local structures not modeled 20 Elevation 60 Azimuth dbi Page 27
28 COMPARE ~ Old vs. New 40M 0 db = 4.8 dbi Europe 20 5 Elevation 60 Azimuth (Europe) Dipole Vertical Δ dbi db Page 28
29 COMPARE ~ Old vs. New O J N 20 40M 0 db = 4.8 dbi E 20 0 db = -0.1 dbi SA Azimuth Gain 20 Elevation Dipole Vertical Δ 60 (Europe) dbi (Africa) (S. America) (Oceana) (Japan) A Elevation 60 Azimuth (Europe) Dipole Vertical Δ dbi db db = -0.9dBi 0 db = -1.6 dbi 0 db = -4.2 dbi Page 29
30 db Difference W1DYJ COMPARE ~ 40M Reality Noise: Worse on 40M by ~1-1.5 S-units Compare: Vertical vs. Dipole (2.50) (7.50) (12.50) Distance 40M Log. (40M) See Appendix for data Coax feed: Δ = MHz. Dipole 35 of RG8x = 0.25 db Vertical 15 of RG8x of Bury-Flex = 0.5 swr 1.5:1 =.29 swr 1.5:1 =.55 db Page 30
31 db Difference W1DYJ COMPARE ~ 40M Reality Compare: Vertical vs. Dipole (2.50) (7.50) (12.50) Degrees 40M See Appendix for data Page 31
32 db Difference W1DYJ COMPARE ~ 40M Reality Compare: Vertical vs. Dipole Europe SA Oceana Japan (2.50) (7.50) House (12.50) Degrees 40M NA See Appendix for data Page 32
33 SWR W1DYJ SWR Graph 40M Vertical - SWR Frequency EZNEC Rig Antenna Rig Page 33
34 Contents Background Original 40M Dipole Why a Vertical? The Design 40M Results 15M Results Page 34
35 Original Fan 15M J N Top N O E E SA A Side 15M SA A 20 SWR EZNEC Elevation 60 Azimuth MEASURED dbi Coax feed: 35 of RG8x ~ MHz // ~ MHz El Gain 60 Az dbi Page 35
36 EZNEC model 40M l/4 vertical O E J N Azimuth Gain 20 El Max dbi dbi Min El 40 4 elevated 10 Very Good ground SA Page 36 Elevation 60 Azimuth dbi Elevation Max Azimuth dbi
37 COMPARE ~ Old vs. New 15M 0 db = 7.2 dbi 20 Elevation 60 Azimuth (Europe) Dipole Vertical Δ dbi db Page 37
38 COMPARE ~ Old vs. New O J N 20 15M 0 db = 7.2 dbi E 20 0 db = 7.3 dbi SA Azimuth Gain 20 Elevation Dipole Vertical Δ 60 (Europe) 1.5 dbi (Africa) (S. America) (Oceana) (Japan) A Elevation 60 Azimuth (Europe) Dipole Vertical Δ dbi db db = 5.9 dbi 0 db = 3.3 dbi 0 db = -1.8 dbi Page 38
39 db Difference W1DYJ COMPARE ~ 15M Reality Noise Worse on 40M by ~1-1.5 S-units Better on 15M by ~ S-unit Compare: Vertical vs. Dipole (2.50) (7.50) (12.50) Distance 40M 15M Log. (40M) Log. (15M) See Appendix for data Coax feed: Δ = MHz. Dipole 35 of RG8x = 0.47 db Vertical 15 of RG8x of Bury-Flex = 0.88 swr 5:1 = 1.1 swr 2:1 = 1.1 db Page 39
40 db Difference W1DYJ COMPARE ~ 15M Reality Compare: Vertical vs. Dipole (2.50) (7.50) (12.50) Distance 40M 15M Log. (40M) Log. (15M) See Appendix for data Page 40
41 db Difference W1DYJ COMPARE ~ Reality Compare: Vertical vs. Dipole Europe SA Oceana Japan (2.50) (7.50) House (12.50) Degrees NA 40M 15M See Appendix for data Page 41
42 SWR SWR W1DYJ SWR Graphs M Vertical - Final M Vertical - Final Frequency EZNEC Rig Antenna Rig Frequency EZNEC Rig Antenna Rig Page 42
43 SWR Graphs 40M Vertical SWR (EZNEC) Ham Bands Autic SWR Measured MFJ891 AAZ S W R Freq MHz Page 43
44 Appendix Measured comparison data Plot Plan of Vertical EZNEC Models Results - WPX Scores Page 44
45 Appendix ~ Measured Comparison Data Example Actually took about 50+ data points Date UTC Freq Station Location peak S-meter * 15M 40M Station Location Dipole Vertical Delta db (@ 5/) db (@ 5/) Distance Degrees 28-Apr w2rox OH (10.00) " " 7224 noise " ka1se CT (5.00) " " " w1prk CT (2.50) " k2kri MA (5.00) " " " wa1ayy MA (10.00) " x3wpl Algeria " " noise (2.50) " FL " x4rj Algeria " n2mun NY (5.00) Apr w1aw/2 NJ (5.00) " m1den England May w1aw/0 NE " n4jt NY (5.00) " ha4xh Hungary " rn3dnm Moscow " noise (7.50) " om3tvm Slovakia " yv4kw Venezuela May wa5lou IN " noise " kd4jm FL " ou5u Denmark * peak S-meter: TS590 reading with AGC slow=8 one S-unit = 5dB above s9 => adjusted to represent db i.e. s9+10db = s11 / s9+20db = s13 Page 45
46 Appendix ~ Plot Plan of Vertical Page 46
47 Appendix ~ EZNEC Modeling Simple Wires: 2 8 V = R = 34, 34.5, 34.7 Simple Wires: V = R = 34.7 Radial H = Simple Wires: V = R = Gnd = Sandy, Avg, Very Good Simple Wires: V = R = Number of Radials = 2, 4, 8 Simple Wires: V = R = Number of Radials = 2, 4, 8 Al tubing, first design 4 35 / 10 V = 34, 35.5, 35 Al tubing, first / 10 With / Without Al mast Al tubing, first / 10 Radials with & w/o insulation New, Stronger Al tubing/ 4 10 R = 34, 33.5 V = 35, 34.5 (4 cases) New, Stronger Al tubing/ 4 10 / 33.5 V = 35 6, 35, 35 4 New, Stronger Al 35 4 / 4 10 / 33.5 Gnd = Sandy, Avg, Very Good Slide included in appendix Page 47
48 Simple Wires: V = R = Number of Radials = 2, 4, 8 N h R=V SWR min 40 (50 Ω) 2:1 GAIN max GAIN min SWR min 15 (75 Ω) 2:1 GAIN max GAIN min Little 15M 21.3 Z=97.56-j Ω 21.3 Z=83.76+j Ω Z=85.88+j0.2432Ω 4r ,+24.6,10 0,=34.7, ,+24.6,10 N=2 W7 W5 center -34.7,0,10 W1 x,y,z W ,0,10 0,0,10 W8 W4 W6 W9-24.6,-24.6,10 0,-34.7, ,-24.6,10 N F SWR min ± F SWR 2:1 4r N=2 N=4 N=8 N= F Page 48
49 Al pole, thin Al Steel mast Connected / not connected W13 1/4 6½ ,0,45.5 Mast SWR min 40 (50 Ω) 2:1 GAIN max GAIN min SWR min 15 (50 Ω) 2:1 GAIN max GAIN min W12 3/8 6½ 29 0,0,39 no yes 7.09 Z= j Z= j < W11 1/2 4½ ,0,32.5 w/o mast w/o mast w/o mast W10 5/8 5½ 18 0,0,28 W9 3/4 2½ ,0,22.5 W8 7/8 2½ 10 0,0,20 Note: in order to show the effect of a metal mast for mounting, a ground type of Real/MININEC must be used W7 1 2½ 7.5 0,0,17.5 with mast with mast with mast W6 1 1/8 2½ 5 0,0, ,0,12.5 W5 1 1/4 2½ W3 0,+35,10 W1 W2-35,0,10 W4 X,Y,Z= +35,0,10 0,0,10 0,-35,10 2 Mounting mast: (.3,.3, 0) (.3,.3,11) Page 49
50 New, Stronger Al 35 4 / 4 10 / 33.5 Ground = Sandy, Average, Very Good Ground Type: Real / High Accuracy: Very Good: pastoral, rich, central US ( S/m, 20 Diel Const) Average: pastoral, heavy clay (0.005, 13) Sandy, dry (0.002, 10) SWR min 40 (50 Ω) 2:1 GAIN max 5 SWR min 15 (50 Ω) 2:1 GAIN max Z=61.21-j1.13Ω 7.02 Z=57.52+j1.499Ω 7.02 Z=55.39-j1.165Ω < dBi / dbi < dBi / dbi < dBi / dbi Z=140.7-j5.101Ω Z=135.7-j5.908Ω Z=134.1-j5.648Ω >2: dbi >2: dbi >2: dbi 40M Average Ground Sandy: 25 Average: 20 Very Good: 20 15M Average Ground Sandy: 40 Average: 40 Very Good: 40 Page 50
51 Results March CQ WPX SSB Contest SOLP 40M Unassisted Overlay SOLP 40M Tribander/ Wires YEAR Location Score Antenna US NA WORLD 2012 Harpswell nd 3 rd 41 st 2013 Woburn st 3 rd 36 th 2014 Harpswell Vertical 4 th 6 th 17 th 2012 Harpswell st 2 nd 5 th 2013 Woburn st 2 nd 10 th 2014 Harpswell Vertical 1 st 2 nd 4 th Page 51
52 Results March CQ WPX SSB Contest SOLP 40M Unassisted Overlay SOLP 40M Tribander/ Wires YEAR Location Score Antenna US NA WORLD 2012 Harpswell nd of 13 3 rd of st of Woburn st of 12 3 rd of th of Harpswell Vertical 4 th of 11 6 th of th of Harpswell st of 3 2 nd of 4 5 th of Woburn st of 4 2 nd of 6 10 th of Harpswell Vertical 1 st of 2 2 nd of 4 4 th of 11 Page 52
53 Thanks Thanks to the following Tower Talkians for suggestions: K1TTT KZ1W N2WN K3ND KK4CPS WA4JQS N6RK K9YC XE2K/AD6D Page 53
Modeling an 80/40/20M Fan Dipole for DX
Modeling an 80/40/20M Fan Dipole for DX New Station New Antennas! Installation and SWR Response Where is the DX? How do these Dipoles Play? (EZNEC) What about Terrain? HFTA and Terrain The effect on these
Basic Wire Antennas. Part II: Loops and Verticals
Basic Wire Antennas Part II: Loops and Verticals A loop antenna is composed of a single loop of wire, greater than a half wavelength long. The loop does not have to be any particular shape. RF power can
Installation Instructions Hustler 6-BTV Trap Vertical
Installation Instructions Hustler 6-BTV Trap Vertical ASSEMBLY 1. Check the package contents against the parts list on page 2. 2. WARNING. Installation of this product near power lines is dangerous. For
ISS Minimalist Antenna
ISS Minimalist Antenna The purpose of this project was to develop an antenna suggestion that would allow for a simple to duplicate, affordable antenna solution for reasonable access to signals transmitted
Portable HF Antennas. Presented to the Stamford Amateur Radio Association. by Jon Perelstein. Copyright 2010 Jon Perelstein 1
Portable HF Antennas Presented to the Stamford Amateur Radio Association by Jon Perelstein Copyright 2010 Jon Perelstein 1 For purposes of this presentation, a portable HF antenna is An antenna that doesn't
Invisible DX Antenna for the Low Bands
Invisible DX Antenna for the Low Bands By Heinz-Josef Pick, DK5WL Summary This paper describes a multi-band DX antenna for the 160m-40m amateur radio bands with low visibility but great performance for
Inverted L vs. Vertical T antennas At the search of the best Tx antenna for a low-latitude location
vs. Vertical T antennas At the search of the best Tx antenna for a lowlatitude location By Pierluigi Luis Mansutti IV3PRK After having learnt which are the effects of the Earth s magnetic field on 160
Working 160M From a Small Lot (and Larger Ones Too)
Working 160M From a Small Lot (and Larger Ones Too) Jim Brown K9YC k9yc@arrl.net http://audiosystemsgroup/com/publish.htm What Happens on 160M? Contests, mostly during winter, mostly CW, one SSB Rag-chewing,
The spiderbeam was developed as a DXpeditioner's dream antenna. It is a full size lightweight tribander yagi made of fiberglass and wire.
The spiderbeam was developed as a DXpeditioner's dream antenna. It is a full size lightweight tribander yagi made of fiberglass and wire. The whole antenna weight is only kg (lbs), making it ideally suited
INSTALLATION INSTRUCTIONS HUSTLER 4-BTV, 5-BTV TRAP VERTICAL WARNING INSTALLATION OF THIS PRODUCT NEAR POWER LINES IS DANGEROUS
INSTALLATION INSTRUCTIONS HUSTLER 4-BTV, 5-BTV TRAP VERTICAL WARNING INSTALLATION OF THIS PRODUCT NEAR POWER LINES IS DANGEROUS FOR YOUR SAFETY, FOLLOW THE INSTALLATION DIRECTIONS GENERAL DESCRIPTION:
My Loop Antenna. Stephen E. Sussman-Fort, Ph.D. AB2EW. stevesf@optonline.net
Stephen E. Sussman-Fort, Ph.D. AB2EW stevesf@optonline.net Outline Brief History Characteristics of Small Loop Antennas for HF My Loop for 40m 15m Receive/Transmit Properties of Elect.-Small Loops Loop
40m-10m DELTA LOOP ANTENNA - GU3WHN
This simple broad band antenna is easy to build, has gain similar to that of a dipole and is tolerant of nearby objects. It can be erected in almost any configuration provided the wires are well separated
Small HF Antennas - - -- - - - -- - - ! The Small Space and Big Antenna Dilemma! Constraints
Small HF Antennas! The Small Space and Big Antenna Dilemma! Constraints " Covenants " Restricted lot size " City Bylaws " Boards of Variance " Strata Rules " Neighbor complaints of unsightly structures
Antennas 101 The Basics. Ward Silver NØAX
Antennas 101 The Basics Ward Silver NØAX The Basics - 1 Antennas radiate (or receive) because electrons are accelerated (or are caused to accelerate) in the antenna s elements Radio or electromagnetic
Designing Log Periodic Antennas
Designing Log Periodic Antennas By Glen Dash, Ampyx LLC, GlenDash at alum.mit.edu Copyright 2000, 2005 Ampyx LLC Lightweight and precise, the log periodic has become a favorite among EMC engineers. In
ZS6BKW vs G5RV. Antenna Patterns/SWR at 40 ft Center height, 27 ft end height ~148 Degree Included Angle
ZS6BKW vs G5RV Antenna Patterns/SWR at 40 ft Center height, 27 ft end height ~148 Degree Included Angle Compiled By: Larry James LeBlanc 2010 For the AARA Ham Radio Club Note: All graphs computed using
EH-20 20m antenna. By VE3RGW
EH-20 20m antenna By VE3RGW Equivalent circuit of EH-20 (prototype 2A) antenna system. Upper cylinder Lower cylinder Ground Counter pose Phasing coil Impedance transformer and tune circuit Tune coil Feed
JP Tribander Owner Manual
JP Tribander Owner Manual JP-Tribander Technical overview JP-Tribander is effective tribander beam for 20m, 15m and 10meters with full size elements without traps. Antenna is designed using latest computer
Another Way to View Propagation Predictions for DXing and Contesting
Another Way to View Propagation Predictions for DXing and Contesting By R. Dean Straw, N6BV Senior Assistant Technical Editor, ARRL April 22, 2006 International DX Convention Visalia, CA I will talk about
Weekend Antennas No. 1 A Bobtail Curtain for 2m
Weekend Antennas No. 1 A Bobtail Curtain for 2m Welcome to the first installment of my new column, which I hope will become a regular feature in Radio ZS. Each installment will present a practical and
VE3MLB Phased Double V Antenna for 75/80 Meter Band
Jan. 17, 2008 VE3MLB Phased Double V Antenna for 75/80 Meter Band This is a story of a double inverted V antenna that I built in January 2008. I already had a full 80 meter Delta loop suspended from my
Just a Dipole. Gary Wescom N0GW July 16, 2007
Just a Dipole Gary Wescom N0GW July 16, 2007 Often we will hear people describing their antennas as just a dipole. After all, a coax cable fed, half wavelength dipole is one of the simplest antennas to
40 Meter Mini-MOXON Beam Antenna. Designed, built, and presented by: Al Koblinski W7XA
40 Meter Mini-MOXON Beam Antenna Designed, built, and presented by: Al Koblinski W7XA Design goals Some forward gain Good directivity (high F/B and F/S ratios) Relatively small size Good Bandwidth (min.
Broadband Terminated Vee Beam Wire Antenna
Broadband Terminated Vee Beam Wire Antenna TEN-TEC Model 3402 and 3403 1.8-54 or 3.5-54 MHz. THROW AWAY YOUR ANTENNA TUNER! Models 3402 and 3403 are broadband terminated vee beam wire antennas. These broadband
Newcomers and Elmers Net: More Wire Antennas 02.14.16 Robert AK3Q
Newcomers and Elmers Net: More Wire Antennas 02.14.16 Robert AK3Q Antenna Construction Supplies Antenna Construction Tools (Harbor Freight can be a good place to go) Wire Cutters; Pliers (regular and needle
M2 Antenna Systems, Inc. Model No: KT34M2
M2 Antenna Systems, Inc. Model No: KT34M2 10m f, MHz G, dbi F/B, db 28.0 7.3 18 28.2 7.3 23 28.4 7.4 25 28.6 7.5 24 29.2 7.6 20 15m f, MHz G, dbi F/B, db 21.0 6.9 19 21.1 6.9 22 21.2 7.0 24 21.3 7.0 24
Efficient 2 meter Disguise Antenna Made From a TV Satellite Dish
Efficient 2 meter Disguise Antenna Made From a TV Satellite Dish This horizontal slot antenna, cut into the reflector of a TV dish, is both the master of disguise and high in performance. By John Portune
SAFETY NOTICE WARNING! POWER LINES CAN KILL YOU
PG1 SAFETY NOTICE WARNING! POWER LINES CAN KILL YOU DO NOT ERECT THIS ANTENNA NEAR ANY OVERHEAD WIRES, UNDER ANY CIRCUMSTANCES. READ AND FOLLOW THESE INSTRUCTIONS CAREFULLY 1) Do not erect this antenna
End Fed Antenna. Operating Manual. version 1.1
Cross Country Wireless (2009) Ltd, 7 Thirlmere Grove, BOLTON, BL4 0QB, UK Email chrism@crosscountrywireless.net Web page http://www.crosscountrywireless.net Telephone +44 (0) 1204 410626 Mobile GSM 900
Regional Emergency Communications. John Walters W8CX Alpena RACES
Regional Emergency Communications John Walters W8CX Alpena RACES Regional Communications Needs 400 mile radius No skip zone; no dead spots No interference with or from broadcasters Reliable day/night coverage
Cheap Antennas for the AMSAT LEO's Kent Britain -- WA5VJB
Cheap Antennas for the AMSAT LEO's Kent Britain -- WA5VJB Cheap LEO Antenna Drew, KO4MA, using the Cheap LEO antenna during a Dayton AMSAT LEO Demonstration Hand held dual band antennas are popular for
CUSHCRAFT R5 (10/12/15/17/20 m) POWER PRACTICAL TESTS INSULATOR
onhr5engres Page 1 of 6 Cushcraft R5 ½ λ Vertical Maintenance and Repair CUSHCRAFT R5 (10/12/15/17/20 m) Cushcraft have made many vertical antennas; R4, R5, R6, R6000, R7, R7000, R8 etc. All are ½ wave
Here are the details with pictures of the items for sale as listed below. Please Scroll Down.
Here are the details with pictures of the items for sale as listed below. Please Scroll Down. Further Items are also available - for further list please phone or e-mail Phone Ivan 073 528 4950 or 021 439
ANTENNER och TILLBEHÖR
ANTENNER och TILLBEHÖR Antenner Fästen Monteringstillbehör Kablar Kontakter SPARK / DB / 6 ANTENNA TYPE VHF fiberglass antenna incl. 5 mtr RG-58 and 1 pc PL-259 connector FREQUENCY 156-162 MHz IMPEDANCE
Cisco Aironet 2.4-GHz MIMO Wall-Mounted Omnidirectional Antenna (AIR-ANT2440NV-R)
Cisco Aironet 2.4-GHz MIMO Wall-Mounted Omnidirectional Antenna (AIR-ANT2440NV-R) This document outlines the specifications for the Cisco Aironet 2.4-GHz MIMO Wall-Mounted Omnidirectional Antenna (AIR-ANT2440NV-R)
Understanding SWR by Example
Understanding SWR by Example Take the mystery and mystique out of standing wave ratio. Darrin Walraven, K5DVW It sometimes seems that one of the most mysterious creatures in the world of Amateur Radio
Technician Licensing Class
Technician Licensing Class Antennas Presented by Amateur Radio Technician Class Element 2 Course Presentation ELEMENT 2 SUB-ELEMENTS (Groupings) About Ham Radio Call Signs Control Mind the Rules Tech Frequencies
A portable 2-element VHF yagi
K3MT presents... A portable 2-element VHF yagi May, 1997 Here's a simple Saturday project: build a portable VHF yagi antenna for 2 meters. All you need is two rabbit ear antennas from Radio Shack, two
2 Meter Half-Wave J-Pole Antenna From 450 Ohm Ladder Line
2 Meter Half-Wave J-Pole Antenna From 450 Ohm Ladder Line Photos: Copyright 2007 David Jordan WA3GIN. All rights reserved. This is a good rainy day antenna project for those of you who would like to home
Selecting Receiving Antennas for Radio Tracking
Selecting Receiving Antennas for Radio Tracking Larry B Kuechle, Advanced Telemetry Systems, Inc. Isanti, Minnesota 55040 lkuechle@atstrack.com The receiving antenna is an integral part of any radio location
VEC-896 Vertical Antenna
VEC-896 Vertical Antenna INTRODUCTION The basic 40 meter quarter wave vertical antenna is 33' tall and requires a reasonably good ground or counterpoise system to function properly. The usual way to eliminate
NVIS ANTENNA THEORY AND DESIGN
NVIS ANTENNA THEORY AND DESIGN Introduction A properly designed Near Vertical Incident Skywave (NVIS) antenna will have a directivity pattern that will maximize transmission and reception at high angles
The VHF / UHF «Eggbeater» Antenna ~ Revisited ~
The VHF / UHF «Eggbeater» Antenna ~ Revisited ~ ON6WG / F5VIF A new simple way to build the Eggbeater Antenna Introduction Previous designs described in «VHF / UHF «Eggbeater» Antenna ~ Part 1» and «VHF
HF OPERATORS SMALL HF ANTENNAS - - - - - - - - - - - Rev 1. John White VA7JW
HF OPERATORS SMALL HF ANTENNAS Rev 1 by John White VA7JW NSARC HF Operators 1 Antenna Problems Big or Small always problems. Affects all - Single family, apartments, condo s, high rises, etc The Small
TEST REPORT INVESTIGATION OF THE FAR-FIELD RADIATION GAIN PATTERN OF THE 20-METER BACKPACKER EH ANTENNA. 23 March 2003
TEST REPORT INVESTIGATION OF THE FAR-FIELD RADIATION GAIN PATTERN OF THE 20-METER BACKPACKER EH ANTENNA 23 March 2003 Introduction Significant claims have been made by the inventor and producers of a novel
UHF DIPOLE ANTENNA AS-2810C/SRC
TECHNICAL MANUAL OPERATION AND INSTALLATION INSTRUCTIONS UHF DIPOLE ANTENNA AS-2810C/SRC Valcom Limited 175 Southgate Drive, P.O.Box 603, Guelph, Ontario, Canada N1H 6L3 Tel: 519-824-3220 Fax: 519-824-3411
Understanding Range for RF Devices
Understanding Range for RF Devices October 2012 White Paper Understanding how environmental factors can affect range is one of the key aspects to deploying a radio frequency (RF) solution. This paper will
Small Dishes for Portable 1296 EME by Allen Katz, K2UYH
Small Dishes for Portable 1296 EME by Allen Katz, K2UYH Abstract: There is growing interest in 1296 EME dxpeditions. This paper discusses two light weight stress dish designs that have sufficient gain
5. ANTENNA TYPES. Figure 5. The vertical dipole and its electromagnetic equivalent, the vertical monopole
Antennas can be classified in several ways. One way is the frequency band of operation. Others include physical structure and electrical/electromagnetic design. The antennas commonly used for LMR both
Antenna Basic Concepts
ANTENNA An antenna is a device to transmit and/or receive electromagnetic waves. Electromagnetic waves are often referred to as radio waves. Most antennas are resonant devices, which operate efficiently
The K9AY Terminated Loop A Compact, Directional Receiving Antenna
The K9AY Terminated Loop A Compact, Directional Receiving Antenna Wish you had enough room for an effective low-band receiving antenna? You do! This four-direction system fits in a 30-foot circle! By Gary
Antenna Trainer EAN. www.edibon.com. Technical Teaching Equipment INTRODUCTION
Antenna Trainer EAN Technical Teaching Equipment Products Products range Units 3.-Communications INTRODUCTION Antennas are the main element of aerial communications. They are the transition between a transmission
ANTENNA PARTS CATALOG
ANTENNA PARTS CATALOG Maco Antennas 302 S. East St. Mt. Carroll, IL 61053 www.macoantennas.net 815-244-3500 www.antennapartsoutlet.com SCREWS / BOLTS PART SIZE LENGTH DESCRIPTION PRICE S21 10-24 1/2" Machine
A Parasitic Lindenblad Antenna for 70cm
A Parasitic Lindenblad Antenna for 70cm Anthony Monteiro, AA2TX AA2TX@amsat.org 1 Copyright 2006 the Amateur Radio Satellite Corporation Printed in the United States of America All Rights Reserved Contents
Avaya WLAN 9100 External Antennas for use with the WAO-9122 Access Point
Avaya WLAN 9100 External Antennas for use with the WAO-9122 Access Point Overview To optimize the overall performance of a WLAN in an outdoor deployment it is important to understand how to maximize coverage
HF Mobile gettin serious
HF Mobile gettin serious I had some big noise problems on my HF rig using my new monoband centre loaded mobile whips. I read K0BG s excellent website dedicated to mobile issues and decided it was finally
Loop Skywire Mysteries Explained?
Introduction: Many antenna books dismiss the horizontal loop or loop skywire as a non performer. However user s of the loop will tell you that it does work; why? I used 80 & 40m loops in the past with
EZ-48-3AB-125-35 Weather Station Mounting Tripod and Mast
EZ-48-3AB-125-35 Weather Station Mounting Tripod and Mast EZ-125-35M 35 Mast Extension (Optional) EZ-125-SK Stake Kit (Optional) EZ-46-3 Tar Pad Kit (Optional) EZ-GWA Guy Wire Kit (Optional) Ambient Weather
HUMAN EXPOSURE TO EMR: ASSESSMENT OF AMATEUR RADIO STATIONS FOR COMPLIANCE WITH ACA REQUIREMENTS
HUMAN EXPOSURE TO EMR: ASSESSMENT OF AMATEUR RADIO STATIONS FOR COMPLIANCE WITH ACA REQUIREMENTS May 2005 Version 2.0 PO Box 78 BELCONNEN ACT 2616 Telephone (02) 6219 5555 Facsimile (02) 6219 5353 www.aca.gov.au
HMS Hairpin Matching Systems
HMS Hairpin Matching Systems DXE-HMS-1P, DXE-HMS-2P, DXE-HMS-4P DXE-HMS-INS-Rev 1b For Use with 1-1/2 Inch through 3 Inch Booms Shown with optional boom, elements and Element Bracket with hardware DX Engineering
'' EGGBEATER '' ANTENNA VHF/UHF ~ PART 2
'' EGGBEATER '' ANTENNA VHF/UHF ~ PART 2 ON6WG / F5VIF Summary Note : In Part 1, Fig 1 shows a maximum gain of 6.45 dbi. Several design attempts were made using slightly different configurations ( i.e.
"EGGBEATER"ANTENNA VHF/UHF ~ PART 1
"EGGBEATER"ANTENNA VHF/UHF ~ PART 1 ON6WG / F5VIF For the enthusiastic listeners or the licensed amateur station wishing to experiment with satellite transmissions without investing a large sum of money
PLEASE - Read this entire booklet and study the diagrams before building a Quad, it can save you unwarranted frustrations!
VHF/UHF Quad Antenna The information in this article has come from many amateur sources, the most notable was from WA6TEY (sk 1985) Ray Frost, who was a pioneer of VHF Quad designs and one of the best
HAM RADIO VHF/UHF MOBILE INSTALLATION
do s - and a few don ts HAM RADIO VHF/UHF MOBILE INSTALLATION by Mike Baker, W8CM Three categories: 1. DC power 2. Antenna 3. Radio INSTALLING THE DC POWER IS LOTS OF FUN INSTALLING THE DC POWER IS LOTS
LOW GAIN BASE STATION ANTENNA AV1312-1A
SPECIALS : AV1312-1A LOW GAIN BASE STATION ANTENNA AV1312-1A AV1312-1A 118 144 MHz 26 MHz 50 Ω DC grounded 1,5 max/depending on mounting 2 dbi E-plane 3 db beamwidth 70 H-plane 3 db beamwidth 200 /depending
Mesikukantie 16, 01300 Vantaa, Tel. +358 (0)9 5494 2600 Rautatehtaankatu 4, 20200 Turku Tel. +358 (0)20 835 3400
VHF ANTENNAS CELmar0-1 Stainless Steel whip incl. mast bracket 0/3 156-162.5 59 CELmar0-10 CELmar0-11 packed in tube 0/3 156-162.5 90 CELmar0-11 Stainless Steel whip incl. mast bracket and 20m cable +
Cellular Wireless Antennas
Cellular Wireless Antennas A Technical Brief GarrettCom Inc., November 2010 Overview The Cellular Wireless Antenna Technical brief is provided to assist with the design and deployment of the DX940 Cellular
These Installation Instructions are valid for antennas in the following version:
Installation Instructions 4 ft CompactLine Antennas (with E-Mount 250 km/h) SB, SBX NMT 560-05(e) These Installation Instructions are valid for antennas in the following version: Reflector Ø 1.2 m (4 ft)
FM Radio Transmitter & Receiver Modules
FM Radio Transmitter & Receiver Modules T5 / R5 Features MINIATURE SIL PACKAGE FULLY SHIELDED DATA RATES UP TO 128KBITS/S RANGE UPTO 300 METRES SINGLE SUPPLY VOLTAGE INDUSTRY PIN COMPATIBLE QFMT5-434 TEMP
An RF Step Attenuator
An RF Step Attenuator When you can find a good, commercially made RF attenuator, expect to pay the price. Here s where doing it yourself can provide you with what you need inexpensively. By Denton Bramwell,
RECOMMENDATION ITU-R M.1091. (Question ITU-R 88/8)
Rec. ITU-R M.1091 1 RECOMMENDATION ITU-R M.1091 REFERENCE OFF-AXIS RADIATION PATTERNS FOR MOBILE EARTH STATION ANTENNAS OPERATING IN THE LAND MOBILE-SATELLITE SERVICE IN THE FREQUENCY RANGE 1 TO 3 GHz
HF/VHF/UHF Go-Box and Antenna System for Transportable Amateur Radio Operation
HF/VHF/UHF Go-Box and Antenna System for Transportable Amateur Radio Operation Jerry D. Kendrick, PhD DrJerryDK@att.net NG6R, LA County DCS T-03 February 2015 http://www.qsl.net/lmtdcs/2015-02-07_go-box
Removable Aluminium posts
Post Solent Sail Shades Ltd 120 Billington Gardens Hedge End Southampton SO30 2RT Tel/Fax: 01489 788243 www.solentsailshades.co.uk Email: info@solentsailshades.co.uk Removable Aluminium posts Single Pole
Shielding Effectiveness Test Method. Harbour s LL, SB, and SS Coaxial Cables. Designs for Improved Shielding Effectiveness
Shielding Effectiveness Test Method Harbour s LL, SB, and SS Coaxial Cables Designs for Improved Shielding Effectiveness Harbour Industries 4744 Shelburne Road Shelburne Vermont 05482 USA 802-985-3311
Which is Better--The Quarter Wave Sloper or the Inverted-V Dipole? A paper by Alpha Delta Communications, Inc.
Which is Better--The Quarter Wave Sloper or the Inverted-V Dipole? A paper by Alpha Delta Communications, Inc. Introduction A question that seems to be asked nearly everyday is, which is best, the quarter
Coaxial Cable Feeder Influence on Yagi Antenna Dragoslav Dobričić, YU1AW dragan@antennex.com
Coaxial Cable Feeder Influence on Yagi Antenna Dragoslav Dobričić, YU1AW dragan@antennex.com Introduction o far, in several previous articles [1, 2, 3], we investigated how boom radius and its S distance
A Practical NVIS Antenna for Emergency or Temporary Communications Rev. 2
A Practical NVIS Antenna for Emergency or Temporary Communications Rev. 2 DX Engineering 2012 P.O. Box 1491 Akron, OH 44309-1491 Phone: (800) 777-0703 Tech Support and International: (330) 572-3200 Fax:
Antenna Glossary Before we talk about specific antennas, there are a few common terms that must be defined and explained:
Antenna Basics Introduction Antennas are a very important component of communication systems. By definition, an antenna is a device used to transform an RF signal, traveling on a conductor, into an electromagnetic
ANTENNA SYSTEMS. 1.8m Offset TxRx Antenna INSTALLATION & ASSEMBLY INSTRUCTIONS
ANTENNA SYSTEMS 1.8m Offset TxRx Antenna INSTALLATION & ASSEMBLY INSTRUCTIONS LIMITED TWELVE (12) MONTH WARRANTY This PATRIOT ANTENNA equipment is warranted to be free from defects in material and workmanship
Paul Wade, W1GHZ. 161 Center Rd Shirley, MA 01464 w1ghz@arrl.net. Figure 1 WR-75 waveguide to coax transition for 10 GHz. 1 Notes appear on page 16.
Rectangular Waveguide to Coax Transition Design Learn how to find the optimum dimensions for a waveguide to coax transition using an empirical approach that relies on a set of impedance measurements and
The J-pole, and now the new X-pole Antenna
The J-pole, and now the new X-pole Antenna By Edward J. Shortridge W4JOQ Introduction I f you are using a vertical J-pole antenna, or you intend to build one, this presentation may make you change your
Correlation between OATS, Fully Anechoic Room and GTEM Radiated Emissions
Correlation between OATS, Fully Anechoic Room and GTEM Radiated Emissions Stephen Clay Introduction: Just a few words about myself. My name is Steve Clay and I work for Nokia Mobile Phones, and it is my
VHF / UHF Direct Connect Beams
2 Meter Antennas for directional, semi-directional, and omni-directional propagation. The web site below contains plans for building a simple directional yagi for 2 meters and other frequencies. http://www.qsl.net/w4sat/antlegn.htm
EMC STANDARDS STANDARDS AND STANDARD MAKING BODIES. International. International Electrotechnical Commission (IEC) http://www.iec.
EMC STANDARDS The EMC standards that a particular electronic product must meet depend on the product application (commercial or military) and the country in which the product is to be used. These EMC regulatory
BALUNS PART I. Andy Griffith W4ULD
BALUNS PART I Andy Griffith W4ULD Recently I was thumbing through my files on baluns and realized that over the years I had collected a wealth of information that could be of use to fellow Hams. So, I
1. Then f has a relative maximum at x = c if f(c) f(x) for all values of x in some
Section 3.1: First Derivative Test Definition. Let f be a function with domain D. 1. Then f has a relative maximum at x = c if f(c) f(x) for all values of x in some open interval containing c. The number
2007 MFJ ENTERPRISES, INC.
80/40/20 Meter Rotatable Dipole Model MFJ-1785 INSTRUCTION MANUAL CAUTION: Read All Instructions Before Operating Equipment MFJ ENTERPRISES, INC. 300 Industrial Park Road Starkville, MS 39759 USA Tel:
Pipe Cutting and Beveling Clamshells
Pipe Cutting and Beveling Clamshells Who We Are One Company, Total Support, Complete Solutions For more than a century, Hydratight has provided world-class bolted joint solutions and continues to set international
3-Component Measuring System
Force 3-omponent Measuring System for utting Force Measurement During Turning Modular system for measurement of cutting forces when turning outside and inside diameters on turret lathes. Machine adapters
EE302 Lesson 14: Antennas
EE302 Lesson 14: Antennas Loaded antennas /4 antennas are desirable because their impedance is purely resistive. At low frequencies, full /4 antennas are sometime impractical (especially in mobile applications).
1 Numerical Electromagnetics Code (NEC)
Wire Antenna Modelling with NEC-2 1 Numerical Electromagnetics Code (NEC) The software Numerical Electromagnetics Code (NEC-2) has been developed in the 1970s in the Lawrence Livermore Laboratory in Livermore,
Assembly Instructions for the InteliTrack 3000 Rail Tracking System
Assembly Instructions for the InteliTrack 3000 Rail Tracking System InteliTrack is a trademark of Sedona Solar Technology. Sedona Solar Technology 16 April 2013 1 1. Before you begin WARNING Safety equipment
ROOF DRAINS TABLE OF CONTENTS
Pictorial Index Product Recommendations Roof Drain Selection Factors Sizing Placement Material & Characteristics Pipe Connection Commonly Specified Options Typical Installations TABLE OF CONTENTS ROOF
Owners Manual For The PackTenna Mini
Owners Manual For The PackTenna Mini By Nick Garner N3WG and George Zafiropoulos KJ6VU Quickstart With The 9:1 Random Wire Version You can identify this version because it has a yellow shrink wrap on the
Cheap Yagi Antennas for VHF/UHF
Cheap Yagi Antennas for VHF/UHF by Kent Britain, WA5VJB edited by John Maca, AB5SS [Editors notes: The antennas described in this article were built as the result of several discussions between Kent and
Datasheet. airmax 2x2 PtP Bridge Dish Antenna. Models: RD-2G24, RD-3G26, RD-5G30, RD-5G30-LW, RD-5G34. Powerful Performance for Long-Range Links
airmax 2x2 PtP Bridge Dish Antenna Models: RD-2G24, RD-3G26, RD-5G30, RD-5G30-LW, RD-5G34 Powerful Performance for Long-Range Links Robust Design and Construction for Outdoor Use Seamless Integration with
2m and 70cm Portable Beam for ARES
The Amateur Radio Emergency Services (ARES) is a group of licensed amateurs who volunteer their time and equipment for communications activity in support of public service agencies. ARES trains with the
Model S9v43. 43 Multiband Vertical Antenna Installation Guide
Model S9v43 43 Multiband Vertical Antenna Installation Guide. WARNING: INSTALLATION OF THIS PRODUCT NEAR POWERLINES IS DANGEROUS. FOR YOUR SAFETY, FOLLOW THE INSTALLATION DIRECTIONS. INTRODUCTION Thank
Analysis of the G3LTF Dual Band Feed for 23cm and 13cm Paul Wade W1GHZ 2004 w1ghz@arrl.net
Analysis of the G3LTF Dual Band Feed for 23cm and 13cm Paul Wade W1GHZ 2004 w1ghz@arrl.net In the March 2004 edition of the RSGB Microwave Newsletter, G3LTF described 1 a dual band feed for the 23 cm and
Silicon Pyranometer Smart Sensor (Part # S-LIB-M003)
(Part # S-LIB-M003) The smart sensor is designed to work with the HOBO Weather Station logger. The smart sensor has a plug-in modular connector that allows it to be added easily to a HOBO Weather Station.