Hi all,
I will be in Macau XX9 on Dec 1 to 6.
Any local Hams in the area for a meeting + coffee break ?
Please contact me off list at akiton...@gmail.com
And also looking to get a information about the nice beach
for antennas for future 160m DX pedition..
Thanks!73, Aki
Wops, I do NOT bring Radio for this trip.Sorry!
73, Aki JA5DQH/KH7A/XX9XX
**
Hi all,
I will be in Macau XX9 on Dec 1 to 6.
Any local Hams in the area for a meeting + coffee break ?
Please contact me off list at akiton...@gmail.com
And
Topbanders,
I didn´t make many qso´s on topband in the cq-ww, but
the single wire beverage at DL0WH has proven efficiency. I was called by
a few na-stations and called a few myself. Obviousely, the K2AV inv-L
over an FCP and the bev combo worked fine. I mostly rxed with the bev.
Just minutes
Hi All,
This night 5T0SP will be active 160/cw, 80/ssb
News from Wlodek SP6EQZ, he will be on TB cw.
Andy
SP6AEG
___
Topband reflector - topband@contesting.com
They were clear as a bell last night on 80M CW, a very very good sign.
I would like to know what sort of low band transmit antennas that 5T0SP and/or
C5A are using. Whatever it is, wow it works to NA. I'm guessing that it looks
out onto ocean to their NW, but don't know geography that well!
Super signal on 80 CW last night from 5T0SP and was able to get them on
the first call...but disappointed that they logged me as K4FZ (according
to Club Log). I have lost so many new ones this way as they send my call
and log something else like K4VFZ or K4FZ. The call K4VFZ has not been
Topbanders,
ON4UN states in his book that the wires for a 2 wire reversible
beverage must be installed side by side, but also may be placed one
above the other with satisfactory results.
Did someone try this? How satisfactory is satisfactory?
Would you rather bite the bullet and install a bev
Yeah, I am mostly all dashes and my KA1J comes back to me as Ka1?J,
KA1?O, KA1O KA1TO. I've gotten AE1J AE1O but the #1 mung I
frequently get is KA1O.
With all the stupid a-holes repeatedly calling their own call when
the DX is trying to pull out a specific call that has no semblance to
ON4UN states in his book that the wires for a 2 wire reversible beverage
must be installed side by side, but also may be placed one above the other
with satisfactory results.
Did someone try this? How satisfactory is satisfactory?
There is no difference at all.
If the feed system is right,
The inverted L loads just fine to about 700 watts and then causes the Alpha
amp to fault out. I think I am getting a sudden change in antenna impedance.
The antenna is fed through a 5 KW rated choke balun. The feed line exits the
base between radials.
Remove the balun. It's not doing
So, how to measure the bev? Is this procedure correct:
The bev is ~8 feet above ground. The far end is open, not grounded, no
resistor.
The analyzer connects directly to the bev and the ground rod at the rx end
through its bnc-to-banana plug adaptor . Measure and note the impedances
for 160,
...or for a single band, instead of using ground rods, use a fair ground
radial network at the far side.
Len
SM7BIC
-Ursprungligt meddelande-
Från: Topband [mailto:topband-boun...@contesting.com] För Tom W8JI
Skickat: den 28 november 2012 16:58
Till: Martin; topband@contesting.com
Ämne:
The sloper loads fine all the way up to 1500 watts. The inverted L loads
just fine to about 700 watts and then causes the Alpha amp to fault out. I
think I am getting a sudden change in antenna impedance. The antenna is fed
through a 5 KW rated choke balun. The feed line exits the base between
The sloper loads fine all the way up to 1500 watts. The inverted L loads just
fine to about 700 watts and then causes the Alpha amp to fault out. I think I
am
getting a sudden change in antenna impedance. The antenna is fed through a 5 KW
rated choke balun. The feed line exits the base
Hi Ashton,
I had some arcing into a coral tree at the 20 ft level. The vertical part of
the inverted L was supported by a 40 ft bamboo pole that was nested close to
the coral tree. The wire was #14 with varnish that probably had long
departed. As the wind blew, the wire would come in
Ash,
You said, I've replaced every component in the system
except for the antenna wire.
Also, if the antenna wire is (or is partly) an insulated
variety, it is possible to have an open fault inside a good exterior
insulation.
Charles - N5UL
Hobbs, NM
Remove the balun. It's not doing anything for your and is a potential source
of loss and problems. Coaxial cable is unbalanced, as is a ground-fed
inverted L. No need for a balun.
Unfortunately, that is not a universally true statement.
MOST antennas are in a neither world of being neither
** Ive noticed no difference in any weather using field phone wire which
happens to be in wide use by many very competitive contesters and lowband
DXers. With 5 2 wire reversibles here and 750' of 1/2 feedline there is
no need for a preamp.
I'm talking about:
1.) impedance change
2.)
Ok, everyone thanks for all the help.
I rebuilt the antenna from new wire, built a two insulator termination at the
end of the horizontal section where the high voltage is, I rehung the new
antenna so that it doesn't touch anything… and the problem persisted. I then
looked into Tom W8JI's
Tom:
MOST antennas are in a neither world of being neither perfectly
balanced nor perfectly unbalanced.
How about an inverted L longer than 1/4 wave but optimized with series
capacitor? Any closer to perfect unbalanced?
Bob VE7BS
___
Topband
There is no practical difference, unless the wires happen to be widely
spaced. (But Tom knew that. :-)
Some people want to build their Beverages with the wires a foot apart. In
that case, one wire over the other would not be ideal.
73, Mike
www.w0btu.com
On Wed, Nov 28, 2012 at 9:49 AM, Tom
On 11/27/2012 10:45 PM, Tim Duffy K3LR wrote:
There is significant coupling between 160 meter antennas that are separated by
as much as 500 feet
YES!
and this coupling could be problem for your set up.
But it can also be a good thing if you know what you have and how to
take advantage of
On 11/28/2012 10:14 AM, Ashton Lee wrote:
I rebuilt the antenna from new wire, built a two insulator termination at the
end of the horizontal section where the high voltage is,
One thing I observed here several years ago with a dipole with an end
touching tree branches is arcing to the
W8JI solved another problem and saved someone much time and frustration.
I'd like to thank Tom for the great help and knowledge he has imparted in
me and many, many others over the years.
In my expert opinion as an engineer he is one of just a very small number
of super engineers I know.
Dave
I second that! Being acquainted with Tom over the years and reading his
informative posts has wonderfully enriched my enjoyment of radio. :-)
73, Mike
www.w0btu.com
On Wed, Nov 28, 2012 at 1:56 PM, DAVID CUTHBERT telegraph...@gmail.comwrote:
W8JI solved another problem and saved someone much
The change in an overheating core has a swing to it and you can watch the
SWR change, in a continuous fashion, while you are transmitting, while arcs
exhibit sudden change.
What you call imbalance was on purpose, but true. The more the radiating
length of an antenna is shortened, the more severe
On 11/28/2012 1:14 PM, Ashton Lee wrote:
I don't know why the issue only showed up on a single antenna of the
many I have fed through that device. But it did.
Simply because the ratio of voltage varies along the feedline if the
SWR is anything other than a perfect 1:1. The feedline length and
That's true; I did assume a reasonably good ground plane, to the extent that
the unbalanced assumption would be accurate.
Still - it's a component that can be removed - at least temporarily - to see if
it is contributing to the problem.
Here's another thought: connect a dummy load out at
I think I might like to try some reversible beverages, but I would
like them to be made so I can easily roll up the wire on a spool
to do mowing, etc. I currently use 19 gauge aluminum electric fence wire
on 3 foot high plastic electric fence insulators with a spike
on the bottom. I space the
Tom:
MOST antennas are in a neither world of being neither perfectly
balanced nor perfectly unbalanced.
How about an inverted L longer than 1/4 wave but optimized with series
capacitor? Any closer to perfect unbalanced?
Bob VE7BS
Hi Bob,
Take the case of a 1/4 wave groundplane with four
- Original Message -
From: Tom W8JI w...@w8ji.com
To: topband@contesting.com
Sent: Wednesday, November 28, 2012 10:49 AM
Subject: Re: Topband: 2 wire beverage question
ON4UN states in his book that the wires for a 2 wire reversible beverage
must be installed side by side, but also
Nice job Mack. The W4AX is very simple and easy to use.
Just wanted to drop you a note of appreciation.
For me in Hawaii it's interesting to hear what's happening on 160m and 80M.
I can use your site to give me an idea of who's out there and to see if I
can pick them up from
Subject: Re: Topband: 2 wire beverage question
** Ive noticed no difference in any weather using field phone wire which
happens to be in wide use by many very competitive contesters and lowband
DXers. With 5 2 wire reversibles here and 750' of 1/2 feedline there is
no need for a preamp.
I am planning a new 160m transmit antenna to be erected in the next few weeks.
Before I install it however I want to get a good history (over a few weeks) of
spots from the reverse beacon network. My problem is that instead of going to
WWW.DXMAPS.COM I would like to get the spots from the
You can download the RBN raw data from:
http://www.reversebeacon.net/raw_data/
After uncompressing the CSV files, you can use a the find command at a DOS
prompt to collect your spots:
find WA3MEJ *.csv wa3mej.csv
After that, it's straightforward to import into Excel and analyze from there.
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