On June 9, 2018 at 6:59 PM terry burge wrote:
Good point Wes. I will see if I can find a decent value of resistor.
My Rig Experts AA-170 was purchased because I did not trust the
readings my MFJ-259b was giving me while working on my hytower.
Pretty penny for these antenna analyzers. But I will bet if it won't
do the stub frequency checks it won't do the velocity factor and
more. Did work pretty good for checking SWR and feedpoint impedance
on antennas like the hytower. Really liked it until this.
Terry
KI7M
> > On June 9, 2018 at 5:11 PM Wes Stewart wrote:
Since he said the coax was 75-ohm, a 75-ohm termination would
be better.
On 6/9/2018 5:07 PM, Richard (Rick) Karlquist wrote:
> > As a sanity check, terminate the coax with a 50 ohm
resistor and verify
> > > that you have good coax. Flat line at 1:1 SWR, etc.
Rick N6RK
On 6/9/2018 4:57 PM, terry burge wrote:
> > > 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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