This probably has a limited audience but I do know that there are some readers on this list interested in fabrication of high impedance common mode chokes for their stations. I built and measured 18
How high is the SWR on your feed line Roger? If I was using a feed line that had 3:1 or higher I expect I would want to use something other than RG58, RG59 or RG8X. Davis BuryFlex certainly will do t
What version are you using Larry. I do not have a problem here downloading it with a Mac or with a PC. The file size is 4.4 MB so that might be a problem for some people. Also, if you are using a ver
Hi Ron: as you have described. I have the AIM 4170C from W5BIG, but it is not a VNA. I think the VNA instrument is an AIM 2180 and the AIM 4170 is an antenna Analyzer. I tried using the AIM 4170 to m
RonL A follow up to my earlier response with respect to measuring the chokes using an AMI 4170. This afternoon I measured two chokes with the AIM 4170 and ploted the results on the two cores, 4 turns
RG400U works very well for in the shack jumpers. [As long as you are only running the legal limit power]. Double silver shielding, Teflon dielectric, etc. Easiest to use crimp connectors rather than
This is an interesting thread which has gotten difficult to follow. Let me see if I understand it correctly. 1. When you transmit at high power either with a continuous carrier [ RTTY] or with a high
For those who can get a copy of QEX to read, check out the very extensive writeup on radials in the recent edition. Much better to read through that several times than to try to understand things by
Once again, experiment trumps theory! There is a lot of room in the ham world for polite skeptics who take the time to run experiments, make measurements and then share the results. Tod, K0TO _______
Dave is quite correct in what he wrote. There are poor theories and poor experiments and lots of folks who are confused by both. My comments were intended to follow on after the email by Jim, VE7RF,
Jim: I read with some interest the following section from one of your emails on this subject. I read that you are saying it is possible to have 1:1 SWR on the feed line and simultaneously have signif
Whoops. Net impedance at the 'feed point'? ? Of the antenna, of the feed line at the station? I am not sure I understand the use of the term "net impedance' Steve. Mentally I am picturing two impedan
I had just posted a comment when I received you email Ian. I think you have summed things up pretty effectively. The discussion has proceeded without the benefit of a set of equations that would have
Ward Silver, N0AX, said: -- "Also, it would greatly facilitate the discussion were we to be able to include drawings - I noticed several misunderstandings that would not have occured if the text was
Hi Wilson. I little bit of timing error on this end. I sent out the email and was 'called off the job by SWMBO and forgot to create the TowerTalk directory at http://www.k0to.us/HAM/File_Share/TowerT
Craig: What measurement equipment and set up did you use to determine the Z of the chokes that you built? Do you have any pictures of the measurement setup? Do you have any graphs or data beyond the
Steve, Jim, Ian: The exchanges have been interesting and useful. Now, it would be great if we had some equations [and diagrams] that laid out how it fits together. Once that is done people can be ref
Dave: One my most memorable Professors in undergraduate school taught us early on that, "ALWAYS AND NEVER ARE TWO WORDS YOU MUST ALWAYS NEVER USE ! " A generally applicable rule. I like your other ru
Are you thinking of Rickettsia or Rocky Mountain Fever? _______________________________________________ _______________________________________________ TowerTalk mailing list TowerTalk@contesting.com
I went back and read the original e-mail. It said 130 mph maximum gust. I am pretty sure that meeting the most recent spec for the area in Idaho that I placed the the tower the maximum wind gust spec