Re: Topband: Handheld Impedance Analyzer

Hi, I use a miniVNA pro with bluetooth Bluevna software to my Android smartphone or tablet. You can calibrate it with your feedline connected so you do real antenna measurement. 73 Henk PA5KT Op 3/27/2016 om 21:08 schreef dick.bingham: Greetings All I am getting fed up with multiple

Re: Topband: Handheld Impedance Analyzer

"Richard (Rick) Karlquist" wrote: > I don't believe the above assertion. > Can anyone give a specific example of an antenna having > an SWR at the resonant frequency, (where X=0), that is higher than > the SWR at frequencies slightly above or below the resonant

Topband: VK0EK

Just worked them on TB They're Tx 1818.5 Heard me on 181685 23:38Z Good luck! 73, Gary KA1J _ Topband Reflector Archives - http://www.contesting.com/_topband

Re: Topband: Handheld Impedance Analyzer

On 3/28/2016 9:14 AM, Jim Brown wrote: On Mon,3/28/2016 4:37 AM, KE1F Lou wrote: Is the lowest SWR is the resonant frequency? Resonant frequency is when Xl=Xc. When Xl=Xc is not necessarily the lowest SWR. Exactly right. If, for example, the antenna's feedpoint impedance at resonance is

Re: Topband: Antenna Impedance Measurements

I couldn't find a price for the AA-170. Can you share it, as well as the place of purchase? Thanks, Mike www.w0btu.com On Mon, Mar 28, 2016 at 4:55 PM, Dick Bingham wrote: > Many thanks to those who sent recommendations for portable antenna > impedance measurement

Topband: Antenna Impedance Measurements

Many thanks to those who sent recommendations for portable antenna impedance measurement tools. I will purchase the AA-170 and smile all the way to the bank. . . 73 Dick/w7wkr CN97uj _ Topband Reflector Archives - http://www.contesting.com/_topband

Re: Topband: Handheld Impedance Analyzer

I recently purchased an MFJ 225 two port handheld mini VNA for $269. http://www.mfjenterprises.com/Product.php?productid=MFJ-225 I do not own more expensive gear to test its calibration against, but so far it appears accurate both for measuring Xl and Xc, SWR and also doing frequency sweeps for

Re: Topband: Handheld Impedance Analyzer

On Mon,3/28/2016 4:37 AM, KE1F Lou wrote: Is the lowest SWR is the resonant frequency? Resonant frequency is when Xl=Xc. When Xl=Xc is not necessarily the lowest SWR. Exactly right. If, for example, the antenna's feedpoint impedance at resonance is different from the feedline impedance, or

Re: Topband: Handheld Impedance Analyzer

Is the lowest SWR is the resonant frequency? Resonant frequency is when Xl=Xc. When Xl=Xc is not necessarily the lowest SWR. 73 Lou KE1F On 3/27/2016 8:30 PM, Robert Harmon wrote: Maybe a dumb question but how can you tell the resonant freq with the AA-54. I have one and can do the graph

Re: Topband: Handheld Impedance Analyzer

Grant has a good list of possibilities in his post. Some newer ones I haven't tried yet. SWR is an extremely limited measurement to analyze antennas. I have had many correspondences with hams led off on a wild goose chase by SWR measurements. With their MFJ 259's etc, I have them create graphs of