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Traps |
Cushcraft Test |
HL1INF Test |
EI7BA Test |
Trap Coil |
Cap.calculation |
TV1 10m |
28.00 MHz 24.00 MHz |
26.28 MHz |
26.5 MHz |
0.789 uH |
40.9 pF |
TV2 15m |
21.20 MHz |
20.04 MHz |
20.05 MHz |
1.923 uH |
29.3 pF |
TV3 17m |
18.11 MHz |
17.16 MHz |
17.5 MHz |
2.806 uH |
27.5 pF |
TV4 20m |
14.47 MHz |
12.63 MHz |
12.85 MHz |
8.270 uH |
14.6 pF |
TV5 30m |
10.25 MHz |
9.705 MHz |
9.73 MHz |
5.819 uH |
41.4 pF |
MFJ-1625
Fishing Line No.80 : 1.44pi, No.50 : 1.20pi
Awhile back, I got to talking with someone in the club about this antenna. Unfortunately, I can't remember who it was, so I thought I would just make these instructions available to everyone. This is, after all, a very nice and easy antenna. I built a 2m version of this about a month after getting my Novice license, KB5QZP (but I had to wait until I upgraded to Technician Plus, KB5RRM before I could use it!). I followed the instructions exactly and I still use the antenna today. It has a beautiful 1:1.2 SWR up and down the voice portion of 2m and 440 bands. Enjoy!
One of the simplest antennas you can build is a quaterwave ground plane antenna. It is small in size and is inexpensive. The only part you will need to buy is an SO-239 panel mount connector. You can use an old wire hanger for the radiator and radials. You will need to use your soldering iron or gun to attach the Radiator to the center post of the SO=239. File any paint or coating from the radiator wire before soldering. Cut the radiator to the proper length before soldering it. If you can find a short copper tube to help secure the radiator to the SO-239, your antenna will stand up to high winds.
The radials may be soldered or attached with screws. Screws are the easier method if you take the time to overlap them as shown in the diagram. Cutting the radials may be done after the construction is complete.
The following charts are in decimal inches.
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If you are just starting out or have the desire to build an antenna here is a simple and fun project. This antenna is perfect for those hams living in the primary coverage area of the .075 repeater. The radials can be made of no. 12 copper wire. The vertical radial (A) should be soldered to the center connector of the SO239. The four base radials (B & C) and (D & E) can be soldered or bolted to the SO239 mounting holes using 4-40 hardware. The four base radials then should be bend downward to a 45 degree angle. The antenna can be mounted by clamping the PL259 to a mast or even passing the coax through a 3/4 ID PVC pipe and compression clamping the PL259. Either way let your creativity flow. If you plan on mounting it outside experience teaches to apply RTV or sealant around the center pin to keep water out of the coax. |
Make each radial a 1/4 wave of your desired frequency. Sometimes it helps to add a little extra |
빛의 속도(모든 종류의 전자기파의 속도)는 진공에서 정확히 초속 299,792,458 미터이다
Heat Shrink Tubing
BALUN(BALanced-to-UNbalanced)역할과종류
BALUN(BALanced-to-UNbalanced) |
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