Ron D'Eau Claire wrote:
One BIG factor is whether you are using a balun in the system. I've yet to
find a balun that isn't unpredictable and frequently lossy when used in a
feedline with high reactance, that is any balanced feedline with an SWR much
above 1:1, no matter the type.
For just that
Very interesting test and another use for the XG1!
Remember, the fat ladder line may be not canceling the currents, ie is not
as balanced as the more narrow line. Or maybe, the window narrow line is
just the better match to the tuner or it is the routing and the surrounding
influences.
-Stuart
That is a good point, as you do not want the AGC to activate giving a wrong
reading on the comparisons.
If it were possible to disable AGC, you would be able to be sure it is out
of affecting measurements. Also, you should use a step attenuator to make
sure no other circuits are overloaded for
An external 4:1 balun is typically less lossy than the built in 4:1 baluns.
Better still, use the W5YR idea, a bead ferrite choke on the coax output,
then connect there with a coax to binding post adapter for balanced line,
and you eliminate questions about your balun.
An alternate is to use a
Stuart K5KVH wrote:
An external 4:1 balun is typically less lossy than the built in 4:1 baluns.
Better still, use the W5YR idea, a bead ferrite choke on the coax output,
then connect there with a coax to binding post adapter for balanced line,
and you eliminate questions about your balun.
For shirt verticals with a low impedance I use a step-up balun, but
again it seems to work better when the X is not the problem, but tehe
R. WB6ZQZ makes a kit.
On Thu, 21 Apr 2005 12:53 pm, Ron D'Eau Claire wrote:
But, if the 4:1 balun is looking into an antenna or feed line with a
high
SWR
W5YR, (sk) used the beads for transition to his balanced line adapter to the
coax connection on his tuner. That is the beauty of the cable choke and
Beads, they are operating on the OUTSIDE of the coax section, and thus the
transformation ratio is taken care of inside the tuner, but RF is blocked
I tested the idea tonight, and got some surprising results. I attached
the XG1 to a 12 foot dipole, which I taped to the center of my 52 ft.
loop (16 X 10 ft.) opposite the feedpoint. I used insulated wire, so
there was not an electrical connection from the XG1 to the antenna, just
wanted the
I have been using my K2 for antenna measurements but the approach I have
taken is to measure the AGC voltage and calibrate it against known
sources in 10 db increments.The chip used for AGC has a linear
region, or I should say linear with respect the db scale, and becomes
non linear on
Vic, KG4HTT wrote:
I tested the idea tonight, and got some surprising results. I attached the
XG1 to a 12 foot dipole, which I taped to the center of my 52 ft. loop (16 X
10 ft.) opposite the feedpoint... I cranked the RF on my K2 all the way up,
but left the audio at 9 o'clock to keep the signal
[EMAIL PROTECTED] wrote:
I tested the idea tonight, and got some surprising results. I attached
the XG1 to a 12 foot dipole, which I taped to the center of my 52 ft.
loop (16 X 10 ft.) opposite the feedpoint.
I'm not sure why you got the result that you did, but it's possible that the
Right now I'm using an end fire array antenna that I also can use as a 52
ft. circumference loop. Given the very high SWR on the feedline,
especially when running the loop on 40M and 80M, I recently swapped out
the 18 feet of 450 ohm window ladder line between my tuner and the
loop, and replaced
Vic wrote:
Right now I'm using an end fire array antenna that I also can use as a 52
ft. circumference loop. Given the very high SWR on the feedline, especially
when running the loop on 40M and 80M, I recently swapped out the 18 feet of
450 ohm window ladder line between my tuner and the loop,
Can the XG1 transmit into a 50 ohm resistor with short stiff wire leads to
couple, near the loop?
-Stuart
K5KVH
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