Tom, I'm emphasizing what Jim mentioned earlier. If the antenna resonant point moved by adding the choke, then that means the feedline was participating to some extent as "part of the antenna." My b
No problem on the ferrites cracking here in KS. 73/jeff/ac0c alpha-charlie-zero-charlie www.ac0c.com On 1/13/2026 12:13 AM, Jim Brown wrote: On 1/12/2026 9:16 PM, Tom Hellem wrote: Im going to try ba
I would not hesitate to put up a vertical dipole. In fact my 30m beam is so directional I'm thinking of putting up one here just to cut down on rotor wear & tear. Assuming you have the height, It's
I don't see the functional difference to have the feedline inside or out. Either way will work fine. Having the coax inside is more "clean" for sure. But I had assumed the gentleman had an existin
It looks like the Y21 method is a bit better, especially with increasing frequency, but the S21 is a decent proxy as is mentioned on the web page article already. And a real indictment of S11... Wo
Brian, would you consider the N2PK VNA in the "fancy" category rearding your calibration comment? Tks 73/jeff/ac0c alpha-charlie-zero-charlie www.ac0c.com "It looks like the Y21 method is a bit bette
Tom, you are absolutely correct. The very very very cool part of a VNA-type device is the ability to move the "calibration point" to the end of a length of coax (using the OSL). This frees you from
I have an AA-55 as well as the 230 Mhz version and I prefer the AA-55. It's bigger and is rugged as hell. I would much recommend that to a guy wanting something he could use for most applications o