Try putting a 50 ohm dummy load in line and see if the K3 and your ext.
meters read the same swr. This will take reactance and inbalance out of the
> ----- Original Message -----
>
> From: "Steve Ellington" <
[hidden email]>
>
>
>>It appears that your coax does not exactly match the impedance of your
>>dipole (It rarely does)....
> -------------------------------------
>
> Thank you Steve for your comments. I fully accept about a probable
> mismatch
> between dipole and coax (and of course the performance of the antenna
> remains to be seen), also that there are many factors affecting SWR and
> that
> sampling at different points along the coax will produce different results
> if there is reactance in the load. In this case the antenna feeder was
> connected to the LP100A about 2.5 inches down the line from the ANT 1
> socket. To my mind that seems a short length to account for an SWR
> difference at 7 Mhz as big as 1.2:1 (K3) vs 2.0:1 (LP100A and MFJ 259B).
> We
> all need to know what sort of load the rig or the amplifier is looking
> into
> and a discrepancy like that is unsettling.
>
> All three measuring devices see no reactance and 1.0:1 at 7.145 MHz. What
> seems to happen is that as one moves up or down in frequency from that
> point
> (and the load gains reactance) the K3 indication remains significantly
> lower than than other two. I doubt if 2.5 inches of coax would account for
> the difference and the MFJ259B, which agrees with the LP100A,
> connects to the antenna feeder at exactly the same point as the K3's
> ANT 1 socket so there is not even that extra 2.5 inches.
>
> It leads me to think that maybe my K3 is not measuring SWR as well as it
> should either due to a fault in my particular one or to the way it is set
> up
> to work.
>
> 73 to all
>
> Geoff
> G3UCK
>
>
>
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