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ASSEMBLY

coil/capacitor assembly 30 meter (P).

19. Place a #10 washer, lock washer and hex nut on both upper clamps of

coil/capacitor assembly 30 meter (P).

20. Pass the lower single clamp of coil/capacitor assembly 30 meter (P) over the

insulator end of coil support tube 30 meter (O) and slide the coil downward

along the tube until the upper edge of the upper clamp is flush with the end of

the insulator.  Align the upper clamp with the coil support tube 30 meter L

bracket (O1) and tighten the hex nut.

21. Stretch the coil until the bottom of the bottom clamp on the coil/capacitor

assembly 30 meter (P) is even with the mark on coil support tube 30 meter (O)

and tighten the wing nut.

22. Slide the remaining clamp from the above assembly over tube (E) and position

it so the coil support tube L bracket (O1) is even with fourth turn, counting

from the top of the 40 meter coil on the coil assembly 80/40 meter (C) and

tighten the hex nut.

23. Hook the coil support tube 30 meter L bracket (O1) around the fourth turn of

the 40 meter coil on coil assembly 80/40 meter (C).  Secure with a # 8 x 3/4"

screw, lock washer and hex nut.

24. Attach strip 17 meter (X) to the bolt that fastens the coil to the plastic

insulator between the coil and the upper clamp of the Coil Assembly 17 Meter

A-17-12 (W).  Use the attached flat washer, lock washer and hex nut.

25. Attach the strip 12 meter (Z) to the coil assembly 12 meter A-17-12 (Y) in the

same way.

26. Loosen the #10 hex nut on the bottom clamp and the wing nut on the upper

clamp of coil assembly 17 meter A-17-12 (W) and slide the assembly over the

upper end of tube (E) with the insulator end up.

27. Slide the unit down until the lower clamp of the coil assembly 17 meter A-17-

12 (W) rests on the upper clamp of the coil/capacitor assembly 30 meter (O).

28. Tighten the hex nut and stretch the coil so that the distance between the

upper edge of the lower clamp and the lower edge of the upper clamp is 10

1/2 in (26.7 cm).

29. Install the coil assembly 12 meter A-17-12 (Y) in the same way, so the lower

edge of the lower clamp is about 2 in (5.1 cm) above the upper clamp of the

coil assembly 17 meter A-17-12 (W).  This distance is not critical.

Summary of Contents for HF9V

Page 1: ...GROUND IT IS ALSO RECOMMENDED THAT ALL STATION EQUIPMENT BE DISCONNECTED FROM THE POWER MAINS BEFORE CONNECTING THE FEEDLINE TO THE ANTENNA PLEASE CONSULT THE A R R L HANDBOOK OR OTHER REFERENCE MANU...

Page 2: ...he end of the tube Pass a 8 x 1 1 2 screw through both parts and secure with a lock washer and hex nut 4 From the center of the insulator measure downward to a point that is 13 in 33 cm along tube B a...

Page 3: ...t 40 meter D2 and install on the smaller 67 pF capacitor as above 12 Install the above assembly onto the 10 screw protruding from the tab of the center clamp on the coil assembly 80 40 meter C Align c...

Page 4: ...et O1 around the fourth turn of the 40 meter coil on coil assembly 80 40 meter C Secure with a 8 x 3 4 screw lock washer and hex nut 24 Attach strip 17 meter X to the bolt that fastens the coil to the...

Page 5: ...so the top edge is 33 1 4 in 84 5 cm from the upper end of the tube 38 Pass the free end of the stranded wire from wire clamp 0 625 6 M w wire T through the small hole in wire clamp 0 750 6 M w insula...

Page 6: ...he uncapped end of tube J into the slotted end of tube I until only 25 in 63 5 cm extends and secure with compression clamp small adjustable NOTE In the following steps the antenna will be assembled a...

Page 7: ...and may be as much as 100 kHz at the high end of the band depending on the efficiency of the ground system used greater bandwidth being associated with lossy ground systems It should be remembered th...

Page 8: ...e and lowest VSWR NOTE To minimize interference to other stations and to avoid erroneous reading use only enough power to produce full scale deflection of the meter in the forward or r f out position...

Page 9: ...re clamp 0 875 15 M w insulator K A change of 2 in 5 1 cm will shift the VSWR curve approximately 300 kHz 6 Check VSWR on 10 meters To raise the resonant frequency loosen the small hose clamp over the...

Page 10: ...equency in all installations In the preceding steps it has been assumed that the antenna has been installed in a more or less clear spot away from other vertical conductors such as TV antenna feedline...

Page 11: ...nnas an electrical 1 4 8 section of 75 ohm coax is used as a geometric mean transformer to match the 100 odd S of feedpoint impedance on that band to a 50 S main transmission line of any convenient le...

Page 12: ...ylene rope may be used but because some grades tend to deteriorate fairly rapidly periodic inspection should be made A single set of guys placed just above the 30 meter circuit will contribute greatly...

Page 13: ...ter L Bracket P 00249SZV Coil Capacitor Assembly 30 Meter Q 00137SZV Coil Q Base Matching R 290 08 Coax 75 Ohm Matching S 00228GZV Connector PL 258 T 00331RZV Wire Clamp 5 8 6 M W Wire U 00332RZV Wire...

Page 14: ...14 Feedline Detail PICTORIAL...

Page 15: ...G AND WEAKEN THE INSTALLATION If U bolts must be used place a larger diameter metal such as the MPS Mounting Post Sleeve over tube w insulator A Similar precautions should be observed when using TV st...

Page 16: ...cken wire may be used as a substitute for radial wires and or a ground connection the mesh or screen acting as one plate of a capacitor to provide coupling to the earth beneath the antenna It should b...

Page 17: ...verticals for reasonable efficiency If the ground loss of resistance of 15 ohms from the preceding example could be reduced to zero ohms it is easy to show that the efficiency of our one eighth wavele...

Page 18: ...that band It s important to note that cutting each conductor of rotator cable to a specific frequency will not work unless you separate it angling each conductor away for most of its length because t...

Page 19: ...a supporting metal structure for antenna currents that might otherwise flow on the structure and thus turn the vertical antenna system into a vertical long wire with unwanted high angle radiation OTHE...

Page 20: ...but it is generally considered that the best possible location for a mobile antenna is in the middle of the roof of the vehicle i e at the center of the vehicle s ground plane and at a point where the...

Page 21: ...building Steel TV mast sections are readily available in lengths of ten feet and the mounting posts of Butternut HF verticals will slide into those which have an outside diameter of 1 1 4 inches and...

Page 22: ...tion 6 in or less Symptom High SWR on one band when antenna is roof mounted Radials are in place but antenna will just not tune Look for Radials of wrong length or running close to metal rain gutters...

Page 23: ...ged or damaged Build up of salt or pollution deposits on insulators and capacitors Radial system corroded or rotted away Owner must do routine maintenance at intervals according to local conditions Sy...

Page 24: ...ure of an antenna to wind or weather c from improper assembly installation or use of an antenna or d from failure periodically to inspect and maintain an antenna and its installation The Customer is r...

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