11m Dipole contruction issues
Posted: Tue Aug 12, 2014 11:27 pm
Hey guys,
I am currently making a 1/2 wave dipole for 27MHz CB and I am having a few issues. I cannot get the antenna SWR down to an acceptable level. I am aiming for a frequency of 27.355 (CH35). (300/27.355)/4 = 2.74m (Length of each side of antenna). I am using RG58U for the antenna itself and will be using rg8 for the feed line to the top of the roof. I did, however, use RG58U as the feed line when testing in the office. I also built my own centre connector, with one side connected to the feedline shield and the other side to the centre conductor.
I cut the required length, soldered it all up, I laid the antenna on the office floor, hooked it up to the radio, but when I test the SWR it is sky high. Near the top end of the scale. I then started nibbling bits of coax off each end to tune the antenna but the SWR was not improving.
I am new to building antennas. Can someone tell me what I am doing wrong???
I am currently making a 1/2 wave dipole for 27MHz CB and I am having a few issues. I cannot get the antenna SWR down to an acceptable level. I am aiming for a frequency of 27.355 (CH35). (300/27.355)/4 = 2.74m (Length of each side of antenna). I am using RG58U for the antenna itself and will be using rg8 for the feed line to the top of the roof. I did, however, use RG58U as the feed line when testing in the office. I also built my own centre connector, with one side connected to the feedline shield and the other side to the centre conductor.
I cut the required length, soldered it all up, I laid the antenna on the office floor, hooked it up to the radio, but when I test the SWR it is sky high. Near the top end of the scale. I then started nibbling bits of coax off each end to tune the antenna but the SWR was not improving.
I am new to building antennas. Can someone tell me what I am doing wrong???