Presentation is loading. Please wait.

Presentation is loading. Please wait.

Purposes of the Amateur Radio Service (a) Recognition and enhancement of the value of the amateur service to the public as a voluntary noncommercial communication.

Similar presentations


Presentation on theme: "Purposes of the Amateur Radio Service (a) Recognition and enhancement of the value of the amateur service to the public as a voluntary noncommercial communication."— Presentation transcript:

1 Purposes of the Amateur Radio Service (a) Recognition and enhancement of the value of the amateur service to the public as a voluntary noncommercial communication service, particularly with respect to providing emergency communications. (a) Recognition and enhancement of the value of the amateur service to the public as a voluntary noncommercial communication service, particularly with respect to providing emergency communications. (b) Continuation and extension of the amateur's proven ability to contribute to the advancement of the radio art. (b) Continuation and extension of the amateur's proven ability to contribute to the advancement of the radio art. (c) Encouragement and improvement of the amateur service through rules which provide for advancing skills in both the communications and technical phases of the art. (c) Encouragement and improvement of the amateur service through rules which provide for advancing skills in both the communications and technical phases of the art. (d) Expansion of the existing reservoir within the amateur radio service of trained operators, technicians, and electronics experts. (d) Expansion of the existing reservoir within the amateur radio service of trained operators, technicians, and electronics experts. (e) Continuation and extension of the amateur's unique ability to enhance international goodwill. (e) Continuation and extension of the amateur's unique ability to enhance international goodwill.

2 Who is this W5WZ? Licensed in 1997 at age 26 (tnx W5LA) Competitive desire to operate instilled (tnx KM5YL, W5LA) Contesting spark ignited at FD 1998 (tnx W5EW) Technical abilities challenged & stretched (thanks K5RUS, K5ER) The recent shack at W5WZ

3 My station has evolved just a bit… KD5CAS station circa April 1998 (and only a single ladder-line fed dipole antenna & antenna tuner)

4 And just for fun… This is KF5GDK, ten years before earning his license. This is KF5GDK, ten years before earning his license. He was calling DQ, DQ! He was calling DQ, DQ!

5 Beverage Antenna for Dummies by W5WZ (also a dummy)

6 Disclaimer: There are smarter guys than me, read their stuff The ARRL Antenna Book The ARRL Antenna Book Lots of antenna infoLots of antenna info Chapter on Long- Wire and Traveling Wave AntennasChapter on Long- Wire and Traveling Wave Antennas

7 Disclaimer: There are smarter guys than me, read their stuff Low-Band DXing by ON4UN Low-Band DXing by ON4UN Complete chapter on Beverage receive antenna Complete chapter on Beverage receive antenna

8 Antenna Gain & Directivity Yagis are directive, i.e. there is less gain in all but forward directions Yagis are directive, i.e. there is less gain in all but forward directions Dipoles are also directive – broadside in 2 directions Dipoles are also directive – broadside in 2 directions Inverted-Vees are also directive - although omni-directional Inverted-Vees are also directive - although omni-directional

9 The Challenge Multi-element Yagi transmit and receive antenna are readily available for 10, 15, 20, & 40 meters Multi-element Yagi transmit and receive antenna are readily available for 10, 15, 20, & 40 meters Tower height and structural requirements for larger directional antennas (40 & especially 80 & 160) gets complex and expensive Tower height and structural requirements for larger directional antennas (40 & especially 80 & 160) gets complex and expensive We all want to work more stations on every band, including 160, 80, & 40 We all want to work more stations on every band, including 160, 80, & 40

10 Common Situation Ham station with wire antenna (usually dipoles) on 160, 80, and sometimes 40 Ham station with wire antenna (usually dipoles) on 160, 80, and sometimes 40 Constraints limit having 160m 3-element at 320 ft & 80m 4-element at 240 ft Constraints limit having 160m 3-element at 320 ft & 80m 4-element at 240 ft $$$$$$ YL of the houseYL of the house Neighbors, landlords, size of lot, etc.Neighbors, landlords, size of lot, etc. Fear of extreme heightsFear of extreme heights You still want to work lots of stations on these bands You still want to work lots of stations on these bands

11 Overcoming the Challenge within the Constraints If you cant increase transmit and receive gain, then increase receive directivity If you cant increase transmit and receive gain, then increase receive directivity Beverage antenna are ideal solution Beverage antenna are ideal solution Cheap to buildCheap to build Simple to erect; one person can do it!Simple to erect; one person can do it! Can be temporary: string the wire for a single contest or the winter seasonCan be temporary: string the wire for a single contest or the winter season The dB gained are in Signal-to-Noise ratio, in a particular direction The dB gained are in Signal-to-Noise ratio, in a particular direction

12 Meet the Beverage A travelling wave antenna made of a length of wire a small height above earth A travelling wave antenna made of a length of wire a small height above earth Terminated for unidirectional receptionTerminated for unidirectional reception Un-terminated for bi-directional reception.Un-terminated for bi-directional reception.

13 Practical Considerations Beverage antenna Beverage antenna Have excellent directivityHave excellent directivity Gain usually never exceeds -3dBiGain usually never exceeds -3dBi Generally, longer Beverages have lower elevation angles and narrower beam widthsGenerally, longer Beverages have lower elevation angles and narrower beam widths Resulting Benefit: Much higher Signal-to- Noise ratio in the desired direction Resulting Benefit: Much higher Signal-to- Noise ratio in the desired direction

14 In the Real World Imagine a W1 working Europe on a vertical antenna with thunderstorms in W4-land Imagine a W1 working Europe on a vertical antenna with thunderstorms in W4-land Instead of S7 signal with S9+10dB noise on the vertical, perhaps S5 signal with only S3 noise and interference on the Beverage Instead of S7 signal with S9+10dB noise on the vertical, perhaps S5 signal with only S3 noise and interference on the Beverage

15 What Do I Need to Build It? Length of wire Length of wire Supports and insulators Supports and insulators 2 ground rods and clamps 2 ground rods and clamps Termination resistors (Ohmite , 470 ohm, 2 watt, flame-proof non-inductive, $1.03 from Allied Electronics) Termination resistors (Ohmite , 470 ohm, 2 watt, flame-proof non-inductive, $1.03 from Allied Electronics) Feed-Point transformer (9:1) Feed-Point transformer (9:1) Store boughtStore bought HomebrewHomebrew Feed line to your receiver Feed line to your receiver

16 Most of the Hardware F-connectors & install tool F-connectors & install tool Transformers Transformers Ground rod clamps Ground rod clamps Resistors Resistors Antenna switch Antenna switch

17 How Much Wire? Computed for 2-meter high over good ground 160 meters80 meters40 meters (0.5 l)141154(0.5 l)148157(1.0 l) (1.0 l)279302(1.0 l)220236(1.5 l) (1.5 l)413446(1.5 l)285302(2.0 l) (2.0 l)554587(2.0 l)443459(3.0 l) (2.5 l)695728(2.5 l) (3.0 l)

18 Supports & Ground Rods Remember to insulate the wire from the support Remember to insulate the wire from the support TreesTrees T-postsT-posts Bamboo sticks, 4x4s, etcBamboo sticks, 4x4s, etc Standard copper-clad ground rods and bronze clamps Standard copper-clad ground rods and bronze clamps

19 Feed-Point Transformer Amidon FT cost $2.25 each Amidon FT cost $2.25 each AWG# 26 spool cost $4.50 AWG# 26 spool cost $4.50 Needs a simple 8- turn trifilar winding for ON4UN design Needs a simple 8- turn trifilar winding for ON4UN design

20 Another Feed Point Transformer W8JI design – see W8JI.com W8JI design – see W8JI.com BN cost $0.50 each BN cost $0.50 each I find the design by W8JI much easier to wind and implement I find the design by W8JI much easier to wind and implement 2-turn primary 5-turn secondary for 75 ohm feed line (6-turns for 50 ohm) Test by placing 470 ohms across secondary, sweep SWR from 1.5 to 10 MHz – should be flat around 1.2 – 1.4:1

21 Feed Point Feed line connectors Feed line connectors Weather proof enclosure Weather proof enclosure

22 Connect to your Receiver Coax feed line Coax feed line 75 or 50 ohm75 or 50 ohm Modify your transformer to accommodate Modify your transformer to accommodate Protect your receiver while transmitting, especially if QRO with both transmit and receive antenna in close proximity Protect your receiver while transmitting, especially if QRO with both transmit and receive antenna in close proximity Front-end saver, CQ magazine, Feb 1997, pages Front-end saver, CQ magazine, Feb 1997, pages

23 Termination Point 5-ft ground rod and clamp 5-ft ground rod and clamp Insulator Insulator Wire-nut method to replace resistor without soldering out in the woods Wire-nut method to replace resistor without soldering out in the woods

24 Feb Initial Result at W5WZ Single-wire 285-ft beverage at 45 degrees, average height about 4.5 feet Single-wire 285-ft beverage at 45 degrees, average height about 4.5 feet Just before local sunset, first evening on 80m CW, transmitting 100 watts on dipole at 75-ft, I worked Just before local sunset, first evening on 80m CW, transmitting 100 watts on dipole at 75-ft, I worked Z31 - MacedoniaZ31 - Macedonia LZ - BulgariaLZ - Bulgaria YO – RomaniaYO – Romania In the previous 12 years of hamming, outside of NA I had only confirmed Canary Islands, Cyprus, Morocco, and Suriname on 80 meters

25 Expanding the Beverage System Add length to the Europe beverage Add length to the Europe beverage Build additional antenna for specific directions – ham population centers Build additional antenna for specific directions – ham population centers Create/install switching scheme Create/install switching scheme Provide receive antenna signal to both radios simultaneously Provide receive antenna signal to both radios simultaneously

26 Benefit of Adding Length for 80 meters A picture is worth 1,000 words A picture is worth 1,000 words

27 Benefit of Adding Length for 160 meters Length REALLY matters on 160m! Length REALLY matters on 160m!

28 Benefit of Additional Directions Ever try to rotate a 500 foot long antenna? Ever try to rotate a 500 foot long antenna? Pull up posts, move termination point, reinstall posts and termination point.Pull up posts, move termination point, reinstall posts and termination point. Use a standard multi-position antenna switch to select different beverage and thus heading. Use a standard multi-position antenna switch to select different beverage and thus heading.

29 Aerial Overview 580 ft beverage at 45 degrees (Europe) 480 ft beverage at 90 degrees (Africa) 800 ft beverage at 270 degrees (VK/ZL) 480 ft beverage at 315 degrees (Japan)

30 Provide Signal to Both Receivers The Magic Tee The Magic Tee The advantage of the "magic tee" is that the two output ports are isolated from each other and the theoretical loss is only 3 dB. The advantage of the "magic tee" is that the two output ports are isolated from each other and the theoretical loss is only 3 dB.

31 How to Build the Magic Tee For 50 ohm coax, change the resistor to 25 ohms For 50 ohm coax, change the resistor to 25 ohms Be SURE to use the right mix of ferrite in the binocular core. Be SURE to use the right mix of ferrite in the binocular core. 73 mix is SUPERIOR73 mix is SUPERIOR Five bucks for 10 binocular toroids Five bucks for 10 binocular toroids Use a 7 turn primary, and a 10 turn center-tapped secondary. Use a 7 turn primary, and a 10 turn center-tapped secondary. The sigs will be 180 degrees out of phaseThe sigs will be 180 degrees out of phase OR, you can buy the $50 DX Engineering box... OR, you can buy the $50 DX Engineering box...

32 Questions?


Download ppt "Purposes of the Amateur Radio Service (a) Recognition and enhancement of the value of the amateur service to the public as a voluntary noncommercial communication."

Similar presentations


Ads by Google