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17

3)

 

o

  

Attach 4 eyebolts and nuts to the PVC pipes at the hole drilled 1 foot (30.5  cm )

below the top of the pole (Figure 8c).

4)

 

o

  

Install 4 3/8 in. bolts, washers, and nuts to the PVC endcaps to make the feet of

the poles (Figure 8d).

5)

 

o

  

Firmly push on the PVC endcaps to one end of each bottom section of the poles

(Figure 8e). [Note: Using glue to put on the endcaps is optional. The resistance alone

is probably enough to hold them in place].

6)

 

o

  

Attach each 5-foot (1.52 m) section (top and bottom pole) together with the PVC

coupler. Firmly press both poles into the coupler. [Note:  Glue is again optional as the

friction will hold the poles together. If you choose to glue the coupler in place ONLY

GLUE ONE SIDE. The two sections of each pole must be able to be taken apart].

7)

 

o

  

Attach each end of one dipole antenna (the end insulator) to the top of one PVC

pole through the hole drilled near the top. Attach using extra wire or rope and leave

about 1 foot between the insulator and the top of the pole.

Field Setup

Setting up the Antenna

1)

 

o

  

Lay out each dipole antenna flat on the ground with the ends of each dipole

facing in the EAST-WEST direction (Figure 9a). Separate each dipole by about 20

feet (6.3 m). When the antenna is completely setup, the dipole wires are

HORIZONTAL to the ground and the ends are pointing in an EAST-WEST direction.

IMPORTANT: for correct phasing of the antenna, make sure that each antenna is

oriented the same direction. That is, the side of the dipole that has the center

conductor soldered to it MUST be pointed toward the same direction (EAST, for

example).

2)

 

o

  

Using one  25 ft. (7.6 m) section of rope, loop it TWICE through an eyebolt

(Figure 8c). Tie loops into each end of the rope.

3)

 

o

  

One person holds up the pole straight while one or two others attach the rope

loops to the tent stakes and push them into the ground (Figure 9b). Push them in at an

angle where the top of the stake faces away from the pole. Once the pole is fairly

secure, push the foot of the pole (protruding bolt) into the ground if possible. This

will add stability.

Summary of Contents for RJ1.1

Page 1: ...JOVE RJ1 1 Antenna Kit Assembly Manual...

Page 2: ...VE RJ1 1 Antenna Kit Assembly Manual March 1999 Antenna Kit and Manual Developed for NASA Radio JOVE Project by Chuck Higgins Francisco Reyes Wes Greenman Jim Gass Thomas D Carr And the Radio JOVE Pro...

Page 3: ...2...

Page 4: ...3 Contents Theory of Operation 5 Site Requirements 5 Time Requirements 5 Dipole Array Schematic 6 Components 8 Tools 10 Parts List 10 Assembly 11 Field Setup 17...

Page 5: ...4...

Page 6: ...nimum requirements are a 25 x 35 ft flat area that has soil suitable for putting stakes into the ground Since the antenna system is sensitive to noise it is best not to set it up near any high tension...

Page 7: ...6...

Page 8: ...7...

Page 9: ...Since the Radio JOVE receiver is tuned to the frequency of 20 1 MHz M mega 106 the wavelength is 48 968 feet 14 925 meters A useful formula for calculating the half wavelength for an ideal dipole in f...

Page 10: ...s the connectors used for the Radio JOVE are called F type connectors and can be manually twisted onto the ends of the coax line These connectors are used to connect the cables to the power combiner a...

Page 11: ...m 14 Gauge Bare Copper Wire 7 stranded 1 70 ft 21 336 m RG59U Coaxial Cable Beldon 8241 4 PVC End Insulators cylinders 2 Plastic Center dogbone insulators 4 Twist on F connectors 1 Power combiner spl...

Page 12: ...2 sections of the coaxial cable to 2 16 2 ft 4 94 m Use the formula above for the ideal antenna wavelength and calculate 2 for the coaxial cable 2 coax 24 48 ft or 24 ft 5 in Multiply by the velocity...

Page 13: ...copper shielding wires underneath the outer cover 2 o Unweave the braided copper shielding using a small screwdriver or the tip of a pen or pencil Start at the end of the wire and carefully unbraid a...

Page 14: ...solder joints will not break 6 o Wrap the bare center conductor around the end of one of the copper wires attached to the center insulator Wrap the twisted shielding around the other copper wire attac...

Page 15: ...Figure 7a 3 o Carefully unbraid about half of the exposed shielding about 3 8 inch 1 cm and fold it back over the other half of the copper shielding and over the outer casing Figure 7b 4 o Remove the...

Page 16: ...t 3 05 m poles If the PVC is cut then four poles will be the top masts and four poles will be the bottoms 2 o Drill holes for the bolts and wires i Drill 1 4 in hole 2 inches 5 1 cm from the top of al...

Page 17: ...6 Figure 8a and 8b Drill the PVC piping and end cap Figure 8c and 8d Install the eyebolt and the 3 8 in bolt into the end cap Figure 8e Install the end cap foot onto the bottom section of the PVC pole...

Page 18: ...d leave about 1 foot between the insulator and the top of the pole Field Setup Setting up the Antenna 1 o Lay out each dipole antenna flat on the ground with the ends of each dipole facing in the EAST...

Page 19: ...gging Do not tighten the guy wires too tight because this will cause undue stress on the dipole antenna 5 o At a North South distance of 20 ft 7 6 m from the first dipole repeat steps 2 4 and set up t...

Page 20: ...19 Figure 9e and 9f Lori and Kia help set up the antenna Figure 9g and 9h JOVE receiver setup with computer...

Page 21: ...20 Figure 9i and 9j JOVE receiver connections and setup with tap recorder Figure 9k and 9l Kia checks the equipment at NASA s Goddard Space Flight Center...

Page 22: ...e power combiner on the twin side by screwing on each F connector to the threads of the combiner Figure 9f 2 o Connect the 1 coaxial cable long coax to the single side of the power combiner 3 o Connec...

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