I don't know what is wrong here but I keep getting in this situation where my
typing starts running back over my writing. I will try again to reply.
Joel,
I have tried all that the manual says without success. All I see is the
horizontal solid and dashed lines of R and X. No indication of a resonance
point anywhere from 1880 KHz up to 10,500 KHz. Go figure? At least my mfj-259b
is working old as it may be. Rig Experts is going to get a nasty note I think.
Disappointing, huh?
Terry
KI7M
> On June 9, 2018 at 2:54 PM Joel Harrison wrote:
>
>
> Hi Terry,
>
> I replaced the 1/4 lines on my 80 meter 4 square this past fall and used
> my AA-170 to set the length with no problem.
>
> Just select "all" for the mode and set the freq you're aiming for and then
> trim the line until X equals zero with the far end open. Should work fine.
> I always calculate the length x VF then add a few feet to start.
>
> 73 Joel W5ZN
>
> > > Hi guys and gals,
> >
> >
> > I have got DX Engineering 75 ohm foam coax to make the
> > stubs/feeders for
> > my Comtek 80 meter 4-Square and am finding some difficulty. Neither
> > my
> > MFJ-259B nor my Rig Experts AA-170 seem to indicate a 1/2 WL at
> > 7500 KHz
> > or a 1/4 WL at 3750 KHz? Or any frequency up or down from there.
> > Seems to
> > me the last time I did this a few years ago I didn't have a problem
> > getting a 1/2 WL dip indicating a resonance location. But now I
> > just don't
> > get any indication of a resonance.
> >
> >
> > DX Engineering said they had got some 75 ohm foam coax that instead
> > of
> > 0.84 VF was more like 0.80 down to 0.76 VF. But checking all the
> > way down
> > to 6000 KHz on 40 meters or 2500 KHz on 80 meters fails.
> >
> >
> > My test is to use either antenna analyzer with a PL-259 installed
> > at one
> > end and an open or a short at the other. I started with 57'7" of
> > coax.
> > Tried both with the coax in a roll and strung out. What am I doing
> > wrong?
> >
> >
> > Terry
> >
> > KI7M
> >
> > 😞
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> >
> > >
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