Home |
Search |
Today's Posts |
#1
|
|||
|
|||
Coaxial Antenna question
I'm trying to build a decent performing 2M coaxial skirted antenna and have a question about its design for maximum efficiency. I based the "hub" on an SO-239 connector. I soldered my RG8X cable center conductor to the solder pin center conductor and brought the shield braid out in two places. I cut a 19" piece of half inch copper pipe, cut 4 half inch slots on one end, fanned the slotted end out slightly to fit nicely against the SO-239, and slid this pipe over my coax and up to the SO-239. I brought the two braid lengths previously prepared out through two of the rather fat slots, soldered the pipe to the SO-239 and the braids were soldered to the pipe where they came protruded out the slots. I soldered an 18 1/2" brass welding rod to a PL-259 center conductor and screwed that the the SO-239 for my radiator. The copper pipe assy and coax slide nicely down into a length of 3/4" PVC . This makes a very nice break-down package for transportation and portable work. Back to my question: I am measuring about 125 watts forward and 4-5 watts reflected at my desired frequency ( 146.000 ). While this may be acceptable to some, I would like to get the match down to 1:1 SWR. Are there any design deficiencies in my proto-type? Can anyone suggest something I might try to improve the match? Is there a "rule of thumb" regarding the construction of such antennas?... length of coaxial skirt vs. antenna element? I appreciate any feedback on this. Thanks. I suppose I could provide a picture if anyone requires it.... Ed K7AAT |
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Forum | |||
16 el coaxial colinear (2.4ghz) question | Antenna | |||
antenna coaxial switch | Homebrew | |||
Coaxial Cable Question | Scanner | |||
Coaxial sleeve antenna? | Antenna | |||
FS: Coaxial skirted VHF antenna | Swap |