Re: Topband: Handheld Impedance Analyzer

On Tue,3/29/2016 7:40 AM, Mike Waters wrote: Interesting! I had no idea that anything was available with that capability. And the AIM2180 is not even the best (or the cheapest) of the units that do it. The winner, by far, is the VNWA 3e. Less than $700 with shipping cables, case, and

Re: Topband: Handheld Impedance Analyzer

Interesting! I had no idea that anything was available with that capability. 73, Mike www.w0btu.com On Tue, Mar 29, 2016 at 8:49 AM, Guy Olinger K2AV wrote: > THIS is the way that you do it. The newer graphing boxes (most of them > since AIM4170) will allow you to

Re: Topband: Handheld Impedance Analyzer

THIS is the way that you do it. The newer graphing boxes (most of them since AIM4170) will allow you to pre-calibrate a transmission line, and then see all results as if you were really up there. Get an instrument (they are getting less and less expensive) that will graph R and X (both below and

Re: Topband: Handheld Impedance Analyzer

On Mon,3/28/2016 10:29 PM, Henk PA5KT wrote: You can calibrate it with your feedline connected so you do real antenna measurement. One point of clarification. If you make a measurement that accurately provides magnitude and phase, including the SIGN of the phase, then accurately determine

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

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: 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

k.bing...@gmail.com> To: topband@contesting.com Sent: Sunday, March 27, 2016 7:08:09 PM Subject: Topband: Handheld Impedance Analyzer Greetings All I am getting fed up with multiple trips between new antenna matching stations and the tx-source/VSWR and not converging on a good match in quick order ! Ple

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

Re: Topband: Handheld Impedance Analyzer

r I've ever owned. 73 Frank W3LPL - Original Message - From: "dick.bingham" <dick.bing...@gmail.com> To: topband@contesting.com Sent: Sunday, March 27, 2016 7:08:09 PM Subject: Topband: Handheld Impedance Analyzer Greetings All I am getting fed up with multiple trips betwee

Re: Topband: Handheld Impedance Analyzer

> To: topband@contesting.com > Sent: Sunday, March 27, 2016 7:08:09 PM > Subject: Topband: Handheld Impedance Analyzer > > Greetings All > > I am getting fed up with multiple trips between new antenna matching > stations and the > tx-source/VSWR and not converging on a goo

Re: Topband: Handheld Impedance Analyzer

Try SARK-110 http://www.sark110.com/home beats others mostly hands down. 73, Martin, OK1RR Dne 27.3.2016 v 21:08 dick.bingham napsal(a): Greetings All I am getting fed up with multiple trips between new antenna matching stations and the tx-source/VSWR and not converging on a good match in

Re: Topband: Handheld Impedance Analyzer

On 3/27/2016 12:08 PM, dick.bingham wrote: 73 Dick/w7wkr CN97uj Most or all of these devices are intolerant of strong AM BCB signals. If you have BCB stations within 10 or 15 miles, try to borrow one to see if it works for your situation before buying one. If you buy one, try to get

Re: Topband: Handheld Impedance Analyzer

Hi Dick, I have an AA-54 and its the best hand held antenna analyzer I've ever owned. 73 Frank W3LPL - Original Message - From: "dick.bingham" <dick.bing...@gmail.com> To: topband@contesting.com Sent: Sunday, March 27, 2016 7:08:09 PM Subject: Topband: Ha

Re: Topband: Handheld Impedance Analyzer

On Sun, Mar 27, 2016 at 2:40 PM, Jim Brown wrote: > I don't have time to write off-list replies to questions that have general > interest, so I'm responding on the list. Same here. :-) My "quick and dirty antenna analyzer is still a 10+ year old MFJ-259B. I > also

Re: Topband: Handheld Impedance Analyzer

On Sun,3/27/2016 12:08 PM, dick.bingham wrote: I certainly do not want to restart this topic but new stuff is becoming available and I don't want to settle for second best if 'best' is not 2X more costly! I don't have time to write off-list replies to questions that have general interest,

Topband: Handheld Impedance Analyzer

Greetings All I am getting fed up with multiple trips between new antenna matching stations and the tx-source/VSWR and not converging on a good match in quick order ! Please send me - OFF LINE - your recommendation for a handheld impedance measuring tool that covers 400KHz to at least