Re: [Elecraft] K3 (not S) Antenna tuner strangeness

Brian, There should have been an increase in SWR between L1 and L2 on 28MHz, but the results on 50MHz indicate that it may be OK. I think the increase in SWR between C1 and C2 is normal, but why does the SWR drop when C3 is selected? That to me indicates a problem with C3 - and possibly C4

Re: [Elecraft] K3 (not S) Antenna tuner strangeness

Thanks Don, Very instructive. All relays click. Tabulated below are the L/C test results. The only anomaly appears to be with C2. It seems to act as a 100 pf rather than the 22 pf it is supposed to be. SWR's 50 ohm dummy load attached to antenna port of K3

Re: [Elecraft] K3 (not S) Antenna tuner strangeness

Brian, You might try going into the KAT3 menu and go through the L1-L8 and C1-C8 settings to hear the relays click with each selection. If all the relays are working, you should be able to do a check on the health of the inductors and capacitors using a method similar to that shown for the

Re: [Elecraft] K3 (not S) Antenna tuner strangeness

Hi Brian, Just a thought, but given the KAT3 uses discrete components for C and L, what you are seeing may be as close as you can get. If you have calculated the tuner parameters from the Z you are seeing at the antenna going into the tuner, compare those with the discrete combinations

Re: [Elecraft] K3 (not S) Antenna tuner strangeness

There is something wrong with the unmatched SWR values you measured/posted. If your load is actually 23.5 +j0 then the beginning SWR is ~2.1:1, not the 1.6 you list. That's not to say that the tuner shouldn't do something with it but it does point to something amiss. Likewise the values you

Re: [Elecraft] K3 (not S) Antenna tuner strangeness

Of brian Sent: Monday, July 25, 2016 6:30 AM To: elecraft@mailman.qth.net Subject: Re: [Elecraft] K3 (not S) Antenna tuner strangeness Hi Don, Further insight needed. John and I have looked into the 80M tuner strangeness problem further. We both have qualitatively seen the same thing

Re: [Elecraft] K3 (not S) Antenna tuner strangeness

Hi Don, Further insight needed. John and I have looked into the 80M tuner strangeness problem further. We both have qualitatively seen the same thing. It is related to trying to tune Z's that are on the order of 25-30 ohms on 160M/80M. John already addressed the grounding issue in his K3.

Re: [Elecraft] K3 (not S) Antenna tuner strangeness

John, Yes, the "earthing" connection to the SO-239 jacks is important. That connection is provided by the mechanical connection to the standoff between the right side panel and the KAT3. The assembly manual instructions will provide adequate connection - first insert the side panel screw

Re: [Elecraft] K3 (not S) Antenna tuner strangeness

Guys, I've run into something on 80M trying to use the internal antenna tuner. It fails to tune to a low SWR. Brian K3KOI had a similar problem but never quite got to the bottom of it because partly intermittent, possibly multiple faults. In the end to fix it:- a) I rewound one of the swr

Re: [Elecraft] K3 (not S) Antenna tuner strangeness

Try a “slightly different tap position” and see what happens. Your words, not mine. …bill nr4c > On Jul 22, 2016, at 12:19 PM, brian wrote: > > Guys, > > I've run into something on 80M trying to use the internal antenna tuner. > It fails to tune to a low SWR. > > My

[Elecraft] K3 (not S) Antenna tuner strangeness

Guys, I've run into something on 80M trying to use the internal antenna tuner. It fails to tune to a low SWR. My recollection is that the tuner worked fine on the same antenna before. "Worked before" may have been with a slightly different tap position. Antenna is an MFJ 1/8 Wave vertical