Bob,I second Frank's recommendation. Hi-Z systems newest combiner allows the
side measurement to be as small as 65 feet on a side and maintain good phasing.
I removed my two 450 foot beverages long ago.
I have a Hi-Z system, 80 feet on a side in my front yard and my 160 TX antenna
in the back
Two years ago just for laughs I made up a larger LOG RX antenna. It was 25 feet
on a side. Feed point impedance was high so a matching transformer was
necessary. Output about -30 db.
The pattern maxes out at an angle around 50 degrees but there is some useful
response at lower 160 meter type
There is an old saying "The enemy of good is perfect." You will be driven
crazy by chasing down every slight variance from the ideal. That being said, it
is important to check out the obvious areas where flaws can create big
problems. Indeed, the feedline coax, typically RG6 CATV line, is a
K9YC made an interesting comment in his post, saying that the feedline chokes
would be most effective if placed at the antenna end of the feedline.
W1FV's 9 circle YCCC array has them right at the controller.
The older K7TJR combiner utilized no feedline chokes. However, I believe that
Lee's new
Regarding the issue of voltage over coax to power the preamps used at the base
of short verticals, Lee, K7TJR, developed an alternative power feed system for
his new SMD preamps using a separate RG6 coax. Apparently, K3LR is using such
an approach to avoid sending voltage down the coax in his 8
Ed,
Have you considered the HiZ 75 ohm preamp? It is one of 4 recommended by John
W1FV and is very reasonably priced. It is designed to preserve a 75 ohm input
which will match the YCCC combiner very well.
73, Dennis W0JX
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I have had a Hi-Z four square up since early 2012. It is a very good system for
my needs. I have adequate land - although it was necessary to put it out in the
front yard to get it away from the TX antenna - for the 80 foot per side
layout. I see 18 to 24 db front to rear rejection depending
On 80 meters, my vertical uses four elevated radials, each are 48 feet in
length and about 11 feet high. They are tied together at the center and loaded
with a small Air Dux coil of approximately 3.4 uh. The other end of the coil is
tied to the coax shield. This antenna works better than the
A while back, I specifically asked K3LC whether there was a significant
difference electrically between tying radials to a buss in a 4 square or just
letting them overlap. To my surprise, Al said that the modeled antenna gain of
the overlapping radial system was slightly greater than that of
All:
I have been working on installing a tower detuning circuit on my 80 foot shunt
fed tower. Of course I found had that the MFJ 259B to be totally inadequate for
adjusting the detuning circuit because of nearby BC RF on 1520 Khz. Results did
improve with the insertion of a 1510 Khz trap built
One way to use the current radial field would be to erect a 30 foot piece of
freestanding aluminum tube right in the center of the radial field and connect
a wire to the top of the short vertical for the remaining length. The wire will
have to slant away from the radial field but a substantial
I suspect that Guy is on to the strong possibility for the relatively poor RX
conditions on 160 this past weekend. I use diversity receive with my K3. The
main RX is connected to a "Dual Flag" array (basically a simplified Waller/
expanded DHDL) and a HiZ 4 square on the sub receiver.
The HiZ
FCC regs say you should use the minimum power necessary to establish
communications. That might require more than 100 watts, perhaps even 1500
depending on conditions, type of TX antenna, etc.
Regarding bandwidth, it is not necessary to run your SSB filter wide open for
JT65. On my K3, I
Mike and Don,
I have been using an expanded version of a DHDL here since November 2011. I was
forced into going this way because the neighborhood around me has become very
noisy and the antenna seems to be less susceptible to noise than my other
antennas. I call it the Dual Flag array. I
Last year I posed a question to Al Christman whether it was really necessary to
solder radials together where they overlap in a phased array. His response to
this question was that he modeled an array where the radials were not
interconnected and that the array's gain was slightly greater than
I've been active on 160 since 1960 starting with a Heath AT-1 at 50 watts into
a 40 meter dipole with the feeders tied together. Cleveland from Chicago was
considered real DX! Starting in 1983, I began to chase real DX on 160 so I've
seen 33 DX seasons pass by so far.
My anecdotal experience
I was lucky to work VP8STI on 160 CW and 80 SSB last night. A Few observations:
There definitely was multi-path propagation on 160 and I think the signal was
arriving at a rather high angle. I can tell this by using my Hi-Z array which
has good directivity to for low angle signals and poor
The 9 el is just an extension of the basic 3 elements in line building block of
the W1FV design. I think that it is great that DXCC is selling the kits to
build these arrays. Personally I think the 9 element is overkill. Only three
elements are active at any time. There is also a 5 element
lid" with absolutely no tendencies
> toward
> oscillations...73, have a good
> season, de gary
>
> The picture
> is with shield removed which normally covers the 5
> FET's
>
> -Original
> Message-
> From: Topband [mailto:topband-boun...@contesting.com
The Waller Flag is a very good TB RX antenna. Most of the time it is installed
in the vertical plane as it was originally developed and is made rotatable. It
can be as low as 20 feet off the ground although some are put on taller towers.
N4IS has also developed a horizontal version, basically
Topbanders:
Within the last 3 to 4 months, I have been plagued with very strong QRN. I have
a two way beverage that party runs over my garage and next to the house but it
had always been an excellent performer in the past. However, in the reverse
direction the QRN was intense, well over S-9
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