J-Pole Antennas for 2 Meters
By: Dr. Carl O. Jelinek N6VNG
This paper describes two types of 2 meter J-Pole antennas, one made of copper pipe and a roll-up J-pole made of TV twin lead. The figures give the details of the dimensions, components and construction.
I hope you enjoy these as much as I have. The Roll-Up J-Pole has been in my case on many trips for the company. Its great to contact the local hams from the Motel room to find out what is going on. One night I found a great swap meet in Huntsville AL.
Table 1. Scaling for other frequencies.
| J-Pole Scaling |
JPOLESCL.xls |
|||
| Dr. Carl O. Jelinek | ||||
| 2/28/96 20:26 | ||||
| Roll-up J-Pole | ||||
| Frequency {MHz} |
147 |
223 |
440 |
28.4 |
| Total Length {in.} |
59.125 |
38.975 |
19.753 |
306.034 |
| To Notch {in.} |
16.875 |
11.124 |
5.638 |
87.346 |
| Stub {in.} |
1.5 |
0.989 |
0.501 |
7.764 |
| Copper J-Pole | ||||
| Frequency {MHz} |
146 |
223 |
440 |
28.2 |
| Total Length {in.} |
60.625 |
39.692 |
20.116 |
313.874 |
| To Notch {in.} |
20.25 |
13.258 |
6.719 |
104.84 |
| Stub {in.} |
3 |
1.964 |
0.995 |
15.532 |
| Spacing {in.} |
3 |
1.964 |
0.995 |
15.532 |
73 de Carl N6VNG.
To get this aritcle and Excel spreadsheet download the following zip file jpole_calculations