Iíve been trying to remember for you Marconi! I canít, so I had to go digging for my notes! The info I was going to give you from my memory would have been totally wrong, so Iím glad I found them & did not go the memory route, haha.
Iíll be honest; I am
probably in the wrong section here since I use the antenna on the CB
Ok, you made me search (dig through a mess) for my notes as I could not remember where I started! I found my notebook (took me a while), but my tuning info is a bit vague & not really completed, but Iíll try to describe my results before I gave up writing anymore down. The SWR was not as bad as I made it out to sound, but it still was not very good when I started. I think I got frustrated more then anything because it took so long taking the antenna down to make a small adjustment then put it back up, I was out there for a good part of the day by my self fooling with it, I think it was getting dark so I just wanted to get it finished quickly.
My original V58 manual which I am
looking at right now states for 27.0 Mhz the overall length is 240Ē & that is where I started. That way there was no guessing on the measurements for the center of the band since I had trouble tuning it in the past guessing for the center of the band & I wanted a good starting point. 27.0 Mhz is pretty much CB
channel-4 (5Khz under four) so I knew my SWR should be acceptable on channel-1 if everything was set as the manual suggests.
On a side note, I just checked a newer manual at the link below & for the V5/8 it shows for 27.0 Mhz the overall length is 248Ē, I wonder why its 8Ē different in mine? Which is it really? Or did they make changes to there antenna, or just the manual again? Maybe there measurements were off? http://www.macoantennas.net/assembly...072810_Web.pdf
On to my notes:
I know I measured from the VERY bottom of the antenna to the VERY top tip of the antenna for my overall length measurement as I always have, even though I was unsure of that step.
I noted my start at 240Ē for 27.0 Mhz. (keep in mind my antenna was very close to metal gutters, trees, etc. so tuning could have been affected from reactance to those objects.)
Checking SWR on CB
channel-1 (where it should have been good) shows it was about a 3.0:1
Checked on channel-40 shows it was a 1.6:1
Next I lowered the vertical element 1/4" & the SWR went up as expected so I went back, for some reason I did not note the SWR readings other then it went up so I knew I had to raise the antenna length. Which was expected to get it better on channel-1.
Next I went back to 240Ē & from there raised the antenna length 1/4", checked SWR on channel-1 & 40 but it was about the same as when I started, maybe went down a hair, but not really noticeable if anything, & maybe my imagination if I did see a difference!
I raised the antenna length another 1/4Ē two more times
& it was about the same, maybe came down a hair, but again, not really noticeable if anything.
Since I was not seeing any results I raised the antenna length by 1Ē, I checked the SWR on channel-1 & it came down to about a 2.2:1
On channel-40 it was about a 1.1:1
Getting better so I raised the antenna length by another 1Ē, checked the SWR on channel-1 & it was still around a 2.2:1
On channel-40 seemed to come down a little & was almost flat & seemed under a 1.1:1
Again, raised the length by another 1Ē, SWR on channel-1 came down to a 2.0:1
Channel-40 still a 1.1:1 or less
Decided to raise the antenna length another 1Ē, SWR on channel-1 came down to about 1.7:1
Channel-40 went up to a 1.2:1
Thatís where my notes stop, I think I may have made another few fine adjustments then left it alone, but I donít remember what the final SWR was. My main frequency is channel 33; I was good there so I canít see tuning much more. I just wanted to get channel 1 as good as I could as I like to be able to go to any of the 40 channels with a decent SWR. So in the end it was probably acceptable through channels 1-40. But I think t was still a little high on channel-1 by the time I was done (over a 1.5 on channel 1).
So I had to go up 4.75Ē inches (probably a little more that I did not note down, so maybe 5Ē or slightly more) to get the SWR acceptable. So overall final height around 244.75Ē to maybe 245Ē or so. But some of this tuning could be from reactance of nearby objects. Seems closer to the newer V5/8 manual? All the changes to the manual really make me wonder, unless the newer antenna is a newer design or something. Now if I would have measured from the bottom of the hole of the C13P clamp instead, then it would have been a little closer to 240Ē, somewhere around 243.25Ē or so.
Well, not the greatest info on my tuning & certainly not complete, but at least I found the notes!
Since my end result was about where I wanted it, I donít think I adjusted the tap point on the ring; I have before, but not sure during this particular setup.