ZR wrote:
15 and 60M and run comparisons for awhile. In areas where countries are
tightly packed a dipole may be a good choice.
Carl
KM1H
I had full size 160M dipoles (not inverted vees) up at 9 meters and
18 meters for about six months and did a lot of A/B'ing of them.
On receive, there was
Hi Rick
I had full size 160M dipoles (not inverted vees) up at 9 meters and
18 meters for about six months and did a lot of A/B'ing of them.
On receive, there was never any difference in audible S/N ratio.
This result is 100% sure to happen. Any time you have more than one resonant
antenna,
Hi it's an interesting discussion about the dipoles. I want to put up an
inverted vee dipole for 160. I can put the apex at 15,30,45 or 60m and have
90 degree apex angle. The ground is very good and I am right on the
magnetic equator.
I'm sure what works here is different for you, but I
N4IS wrote:
Hi Rick
I had full size 160M dipoles (not inverted vees) up at 9 meters and
18 meters for about six months and did a lot of A/B'ing of them.
On receive, there was never any difference in audible S/N ratio.
This result is 100% sure to happen. Any time you have more than one
RDF is the key point to improve signal noise, not gain. Vertical or low
dipole has very or none directivity, so low RDF or directivity does not
improve signal noise.
In general, this is the case, but it is not always true. Consider that you
can have an antenna with a high RDF number, but at
RDF is the key point to improve signal noise, not gain. Vertical or low
dipole has very or none directivity, so low RDF or directivity does not
improve signal noise.
In general, this is the case, but it is not always true.
Since I started using RDF, let me explain what it really is.
RDF is
I put up a 160m dipole but now need to tune it. SWR at low end of band is abt 3
and at top end abt 5. From what I have read this means I need to shorten it. My
question is how much should I take off? A foot off each end?? Any good links to
sites that may explain this in some detail so I can
Paul,
Here is a handy on line calculator to help you determine the approx wire length.
You can play with putting in different freqs and see how much the wire length
changes.
I believe with frequency changes of 10KHZ the wire length changes by about one
foot.
So if it is resonant at 1.800 and
I would rather guess you should short it by at least 4-6 foot per side.
Easiest way is to check for the resonant frequency and short accordingly.
73
Peter, DJ7WW
-Original Message-
From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of paul
ecker
Sent: Mittwoch, 31. Oktober
Jim
high RDF number with significant lobes off the back that are only 10 dB down
from the main signal
There is no high RDF with lobes 10 db down, or one or another, not both at
the same time.
Regards
JCarlos
N4IS
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Topband reflector -
Hi thanks for all the replies I have decided to put the dipole up at the 45m
level. One more question - I will run the feed line up inside the tower so is
a choke still needed at the feed point? Thanks and hope to be QRV on 160 for
the WW CW.
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