Hey gentlemen,today I campared my new LOG, it is 30m in the square,signals
from NA were weak here , but a good day to
test this simple new RX antenna.I switched between my 2x180m end-fire beverage,
the LOG loop on ground,7m short HIZ vertical and TX T-antenna.here are two
clips, W1AW beacon
Thanks for all the replies on and off the reflector. My antenna, now a 90'
top loaded vertical with 60 x 100' radials, was not transmitting well.
While trying to fix it, I changed from an inverted L to the top loaded
configuration, and I stripped off the hairpin coil (1/4" copper tubing) and
the
I'll second Rick's approach, although I've not incorporated it yet. I built a
parallel wire transformer per Sevick Fig 6-11. It measures just fine. Until
it's installed I'm using an inverted-L with a shortened top wire which makes the
feed capacitive. A shunt inductor forms an L-network and
Perhaps a "hair pin" match? I used a hair pin coil at the base of a vertical
that was 35 ohms.
73, Mike WA5POK
On Monday, January 17, 2022, 01:36:12 PM EST, Tim Duffy
wrote:
I match my 26 ohm feed point with a simple L network. One series coil then a
shunt capacitor. Steps up to
My sloper is fed at the 72 foot point on an 86 foot tower where the coax
is grounded to the tower leg and with about 12 feet of mast above the
tower .. This wasn't enough on 160 and I added a 130 foot counterpoise
wire which is connected to the tower leg where the coax is attached and
goes
I match my 26 ohm feed point with a simple L network. One series coil then a
shunt capacitor. Steps up to 50 ohms perfectly.
73
Tim K3LR
-Original Message-
From: Topband [mailto:topband-bounces+k3lr=k3lr@contesting.com] On
Behalf Of Richard (Rick) Karlquist
Sent: Monday, January 17,
Maybe this will help:
I use a 1:2.25 Unun (3 to 2 turns ratio). It will match 22.2 ohms
to 50 ohms. It is wound on a single 2.4 inch diameter core of 77
material. A pair of RG-58 coax cables are wound around it in
tandem. I put on as many turns as would fit ... about 10 turns.
The shields of
Hi Pete,
1/4 wave electrical length.
89 feet for two RG-11 solid dielectric coaxes in parallel.
73
Frank
W3LPL
From: "Pete N4ZR N4ZR"
To: "donovanf"
Sent: Monday, January 17, 2022 5:12:48 PM
Subject: Re: Topband: 1:2 UNUN
lengths? 1/4 wave?
73, Pete N4ZR
Check out the new
1/4 wavelength of 75 / 2 = 37.5 Ohms
Will take your 28 ohms very close to 50.
On Mon, Jan 17, 2022 at 8:47 AM Kenny Silverman
wrote:
> Thanks Frank. Are these 1/4 wl lines? And are T-connectors OK?
>
> Regards , Kenny K2KW
>
> > On Jan 17, 2022, at 11:29 AM, Frank W3LPL
> wrote:
> >
> > Hi
Kenny -
Yes, 1/4 wavelength electrical length. 89 feet of RG-11 (not the
foam dielectric version used for CATV)
UHF T connectors are fine, if you need any I'll give them to you.
73
Frank
W3LPL
- Original Message -
From: "Kenneth Silverman"
To: "donovanf"
Cc: "topband"
Sent:
Hi Kenny,
A very workable alternative is to use two lengths of 75 ohm coax
in parallel. RG-11 is the best choice, but two lengths of RG-6
will also work. No need to coil it up, simply use it as part
of your transmission line from your antenna base to your station.
73
Frank
W3LPL
- Original
Thanks Frank. Are these 1/4 wl lines? And are T-connectors OK?
Regards , Kenny K2KW
> On Jan 17, 2022, at 11:29 AM, Frank W3LPL wrote:
>
> Hi Kenny,
>
> A very workable alternative is to use two lengths of 75 ohm coax
> in parallel. RG-11 is the best choice, but two lengths of RG-6
> will
I've posted about my software on TowerTalk, but I completely forgot
about Topband. 160m ops may find these Windows programs useful.
I've written a program that calculates ground permittivity,
conductivity, and skin depth using impedance data from a soil probe and
vector network analyzer, such
Kenny,
I used three large torroid cores, 12AWG silver/teflon wire, and 10
turns/14 turns to match 25 ohms to 50 ohms. There is a picture of the
transformer in my Phasing Switch Box at:
https://www.n6ws.com/projects/
To give you some perspective of size, it is in a 8" x 8" box.
73, Bill
Does anyone have a drawing on how to wind a 1500w 1:2 UNUN? And what type of
core is needed?
This is for my 160m vertical which is about 28 ohms.
Regards , Kenny K2KW
_
Searchable Archives: http://www.contesting.com/_topband - Topband Reflector
Hey
Due to protracted problems, I was only able to arrive at my station on
January 15th.
Installed a new beverage in the USA, Australia and a switch on four
receiving antennas
( The switch is made by UW7LL ).
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