Hi Carl,
On Sat, Feb 26, 2011 at 9:23 AM, ZR z...@jeremy.mv.com wrote:
Since the Beverage is a non resonant piece of wire Im curious how close it
can be to those verticals?
A *good* array of short verticals is generally a better receive antenna than
any Beverage. However, the Beverage is
On Thu, Mar 17, 2011 at 11:55 AM, Fred Bennett n...@n2fj.com wrote:
Hi all.. Iam getting ready to put up a bunch of beverage antennas.. I was
told that I could use electric fence wire for them.. any suggestions on
this?
73,
Fred N2FJ
Hello Fred,
Absolutely you can! Earl, K6SE (SK) swore
WOW! This sure got my attention. I have a Tektronix 465B and two
bi-directional Beverages. The thought of using it as a TDR is exciting. Can
you provide any more details of what you've done (like sweep freq settings,
etc.)? TIA.
73 Mike
http://www.w0btu.com/Beverage_antennas.html
On Sun, May 15,
Hello Charlie,
I think you will find that longer Beverages on a hill, even with ups and
downs, will surprise you with their outstanding performance.
You say you tried some short Beverages. Can you put up some about one
wavelength? I have two 580' two-wire bi-directional antennas, and part of
So other than phasing two Beverages, has anyone found a reason why DX
Engineering does this?
73, Mike
http://www.w0btu.com/Beverage_antennas.html
On Tue, Aug 9, 2011 at 3:18 PM, K4RO Kirk Pickering k...@k4ro.net wrote:
On Tue, Aug 09, 2011 at 02:34:19PM -0500, Phil Clements wrote:
Sure
On Sat, Oct 8, 2011 at 3:40 PM, Jim Brown j...@audiosystemsgroup.com wrote:
... you should be using ONLY coax with a heavy copper braid shield for
transmitting on the HF and MF bands.
I know several Topbanders--and others--that are using inexpensive 75-ohm
aluminum shield CATV-style 'RG-6',
2011/10/10 John K9UWA j...@johnjeanantiqueradio.com
As per the VK1OD website chart RG-6 has less loss than anything else shown.
Matches RG-213 at 1.8 Mhz ... It seems to me that RG-6 is pretty good coax
for our purposes.
Indeed! There are millions of miles of aluminum shield CCS (copper-clad
On Mon, Oct 10, 2011 at 8:38 AM, ZR z...@jeremy.mv.com wrote:
Ive been using BN73-202 cores on 2 wire reversible Beverages in the
500-900' range. They work fine down to 150KHz with surprisingly good
directivity on the LF BC stations as well as NDB's ... performance is good
thru 30M.
Even 20
Hello Herb,
To me, this sounds like a termination problem. If the termination is missing
(or defective), there will be standing waves on the Beverage and at certain
frequencies it will act like a short at the end.
I know you said you swept the antenna on other frequencies, but I can't
think of
You can't beat Barry's 'front end saver' at http://n1eu.com for a
combination of simplicity and effectiveness.
Two back-to-back diode strings (four 1N914 diodes per string) and a series
22 ohm resistor. If the diodes should go into conduction due to excessive RF
on the RX antenna, the resistor
On Tue, Nov 8, 2011 at 2:56 PM, wa3...@comcast.net wrote:
I am getting ready to put up a beverage for top band. I have decided that
I want to put up a two wire system using window line because of the ease of
assembly. I am not sure if I will use it in the null steering mode or just
switch
There is a helpful thread discussing this very subject at
http://www.eham.net/ehamforum/smf/index.php/topic,78887.msg554442.html.
Are these towers your 160 transmitting antennas? You want to get the
Beverages as far away from the towers as possible, even if you have to
shorten the Beverages to do
Not to worry. Your Beverage will work fine, as long as you feed it, etc.
properly. They are not critical. It has well and often been said that
Beverages just want to work.
My NE-SW 580' Beverage crosses a ravine wider than yours, not to mention
running up and down a hill. Believe me, it hears
I haven't been following this thread real close, but I folded the two 10'
high elevated 1/4λ radials on my own 3/8λ inverted-L --per Guy's suggestion
to me a two or three years ago-- as follows:
Radial # 1: North about half-way (a little less than 1/8λ), then east 10',
then south the rest of the
On Thu, Nov 17, 2011 at 1:11 AM, Tom McAlee t...@klient.com wrote:
1. Why the need to keep it 300' from the inverted L? ... My E/W
Beverage, which runs within 100' of my 160m TX vertical ... It is worth
noting that this antenna merely passes by one or more TX verticals within
100'; the
On Tue, Nov 29, 2011 at 9:51 PM, Peter Voelpel df...@t-online.de wrote:
Be careful with cheap tv cable. Some are just steel wire with a very thin
copper layer ... on 160m you might run into too high losses.
Very true. But the 1000' rolls of Commscope RG-6 I bought cheaply off of
eBay had a
On Tue, Nov 29, 2011 at 11:12 PM, Joe Subich, W4TV li...@subich.com wrote:
What is more, it has the same low loss and similar power handling
capabilities as RG-213/U. http://vk1od.net/transmissionline/RG6/
While that may be true for loss at the lower HF range, it is not the case
in the
On Wed, Dec 7, 2011 at 2:54 PM, sebdesnCC sebd...@comcast.net wrote:
I dug out my EZNEC version3.03, ... I was on the site in the last few
weeks and it was operational,but, now for the last few days I can't bring
it up,Has he closed the company
down??? ...
Bud W0HG
I just brought up
On Thu, Dec 8, 2011 at 7:21 PM, W0UCE w0...@nc.rr.com wrote:
* The ONLY means of achieving the required degree of Isolation is to
use the Isolation Transformer as specified by K2AV
I was thinking of sliding a whole bunch of ferrite beads over the coax
feedline right at the end. But I'll
Herb,
The MFJ-1025/1026 is a great unit, but as Tom Rauch notes on
http://www.w8ji.com/mfj-1025_1026.htm, it does not cover the full 360
degree phase range as it ought to. He explains how to fix that at the
bottom of that page.
I added a relay controlled by a front panel toggle switch to my
Hi Herb,
I wouldn't worry about an S-unit of noise increase, especially on 160.
That's bound to happen with any active device like the MFJ-1025; and with
the normal BG noise level on 160, I don't think it'll keep you from hearing
anything.
73, Mike
www.w0btu.com
On Thu, Jan 5, 2012 at 4:20 PM,
I know that some people swear by vents. But I personally have had terrible
results venting my Beverage antenna control enclosures. The enclosed relay
has froze up more than once from condensation, caused by humid air getting
inside and freezing (usually in the dark and in the dead of winter). But
This is impressive. Another gentleman on the Gentleman's Band. :-)
If everyone was as courteous as this, the bands would be much better
than they are.
Anyway, you may not have room for a long Beverage or large phased
receiving array, but maybe some of us here can figure out a way of
helping you
I certainly remember how exciting my first DX on 160 was. I was so excited
that my new antennas were working that I ran upstairs whooping and
hollering to my wife something about breaking the pileup on the first call.
For the next two years or so, I worked nothing but 160 CW. :-)
73, Mike
There are a couple of K9AY models (done by others, not me) at
http://www.w0btu.com/files/antenna/EZNEC/ . Help yourself. :-)
___
UR RST IS ... ... ..9 QSB QSB - hw? BK
On Fri, Feb 17, 2012 at 10:14 AM, Tree t...@kkn.net wrote:
- I am personally excited about the new 630 meter band.
So am I ! :-)
I think it would be good to continue to allow discussions about it here,
even though this list is really meant for 160 meters.
How hard can it be to homebrew a CW
Try http://amfone.net. Lots of good, knowledgeable people there, and some
are on 160.
___
UR RST IS ... ... ..9 QSB QSB - hw? BK
On Tue, Feb 21, 2012 at 7:58 PM, ZR z...@jeremy.mv.com wrote:
I recently talked to Ken Gordon, W7EKB, who owns 600...@w7ekb.com, the
600M experimental group forum about opening it up to hams
Do you have a link to the forum, Carl? It doesn't appear to be on w7ekb.com.
73, Mike
www.w0btu.com
Thanks. That must be it. http://www.500kc.com/Maillists.htm
On Tue, Feb 21, 2012 at 9:59 PM, Tod Olson t...@k0to.us wrote:
http://www.500kc.com/
___
UR RST IS ... ... ..9 QSB QSB - hw? BK
Is this a new Beverage antenna, and can you tell us more about it? How are
you feeding and grounding it?
How steep is the mountain? I've heard of some Beverages running up and/or
down some pretty steep slopes that still work fine.
73, Mike
www.w0btu.com/Beverage_antennas.html
On Mon, Feb 27,
On Wed, Feb 22, 2012 at 4:16 PM, Pete Smith N4ZR n...@contesting.comwrote:
... I ran across an inexpensive 8-way relay board on E-bay for less than
$20. It is controlled by a 300-MHz radio remote, ...
I just bought one of these. The only instructions are on the eBay page, and
they are
How does the signal level from a BOG compare to the signal level from an
elevated Beverage? I'm sure the output from a BOG is less. But how much
less? Enough to require a remote preamp? I've always wondered.
I --and many others-- have found a remote preamp on an *elevated* Beverage
to be totally
If your summer storm static pretty much goes to almost nothing on your
Beverages, you certainly have better Beverages than I do!
I have heard it said that the summer static on a BOG can be less than on an
elevated Beverage. Any thoughts?
73, Mike
http://www.w0btu.com/Beverage_antennas.html
On
On Mon, Mar 19, 2012 at 1:23 PM, Milt -- N5IA n...@zia-connection.comwrote:
4. There is NO substitute for acreage.
True. But I've heard that a 150' Slinky Beverage can do nearly as well as a
580' Beverage. If I didn't have 10 acres, I would either try a Slinky or a
BOG.
73, Mike
On Mon, Mar 19, 2012 at 3:55 PM, Jim F. j_fit...@yahoo.com wrote:
QRPers generally do not need Beverages as much as other stations do. Think
about that one for awhile.
People using Beverages actually would need much more than the legal limit
to work everyone they hear. Think about that for
On Wed, Mar 21, 2012 at 10:57 AM, dnem...@aol.com wrote:
My brother W2NFK just purchased a G5RV MAX ... Anyone have any ideas for
a RF choke
I made a common mode choke for a G5RV-style antenna by stacking four 2.4
OD #31 mix toroids and winding 5 turns of RG-6 through it. It goes on the
Thanks for the wisdom, Rich. :-)
However, I've always wondered about the following statement. My question
is, on what amateur bands is this common? And on what amateur bands is this
possible?
On Sat, May 5, 2012 at 7:07 AM, Richard Fry r...@adams.net wrote:
Those fields from very low elevation
I'm pretty sure this surface wave at ~0 degrees elevation is useful on (and
below) the AM broadcast band (especially the lower portion) and 160 meters.
But what about at 3.5, 5, 7, 10, 14, 18, 21, 24, and 28 MHz? That's what
I've been trying to figure out: exactly how useful is this radiation at
And this seems like a good place and time to ask another question.
I get the experience that the usefulness of NVIS radiation peaks around 80
meters. It's not useful on the AM broadcast band, and it's not useful on 20
meters. How accurate is my assumption?
73, Mike
www.w0btu.com
I've never operated mobile, but it sounds like you're saying the daytime
local range on 160 and 10 is comparable.
But Rich is also talking about the radiation at zero degrees bouncing off
the ionosphere and returning to the earth at some distant point. That's
what I'm wondering about. Local is
Let me expand on what I said previously.
I always thought that ground wave propagation decreased with frequency. For
example, don't AM broadcast stations in the lower end of the AM broadcast
band have greater coverage than at the high end, all things being equal? I
have always thought that, and I
I don't think the length is the reason that you're not hearing any signals
or noise in the reverse direction. How well does it work on 40 in the
forward direction?
I don't know all the details of what you have there (and what you've
tried). But the first thing that came to mind is that the
Is this the Beverage above the fence that you mean, Greg?
http://www.g3xrj.com/RxArray_files/2wire_bev/2wire_bev.htm
That was a good article.
73, Mike
www.w0btu.com
On Wed, May 23, 2012 at 3:05 AM, Greg - ZL3IX zl...@inet.net.nz wrote:
I have not tried to run two Bevs like that, but I have
Sounds like fishing net beacons, Joe.
http://www.genesisradio.com.au/VK2DX/fishnet.html
http://www.w8ji.com/ndb%20beacon%20fish%20buoy%20net%20beacons.htm
73, Mike
www.w0btu.com
On Mon, Jun 11, 2012 at 3:58 AM, joe gali...@comcast.net wrote:
I've been copying strange 4 character cw messages
on? Your 140' BOG or your inverted-L?
73, Mike
www.w0btu.com
On Mon, Jun 11, 2012 at 10:22 AM, joe gali...@comcast.net wrote:
Yep, indeed it is! Now to figure out where they are coming from? Hi
Hi. Thanks Mike.
On Mon, 2012-06-11 at 08:38 -0500, Mike Waters wrote:
Sounds like fishing net
Here's the page that I regularly look at to determine whether I want to go
listen on 160 or 80:
http://www.intellicast.com/Storm/Severe/Lightning.aspx
And if I want to know if a specific DX location has lightning (could
someone there hear me?), I look at
That site looks interesting, but all the little colored hollow squares
scattered all over the map confused me. I thought they were lightning
strikes, but from what I can tell, they are simply the locations of
different types of sensors. I wish there was a way to disable their display
and show only
All I hear is distant lightning QRN. But good things come to all who
patiently wait for sunset and the ensuing darkness. :-)
73, Mike
www.w0btu.com
On Sat, Jun 16, 2012 at 11:39 AM, Bill Cromwell wrcromw...@gmail.comwrote:
So far all I am receiving is noise.
Well, I plan on trying to enjoy the contest a little, even though all I can
do today is listen. :-)
73, Mike
www.w0btu.com
On Sat, Jun 16, 2012 at 3:42 PM, Bill Cromwell wrcromw...@gmail.com wrote:
... The votes are in. Wait until dark. ... I will give QRP a try but I
expect to crank in all
Beverage receiving antennas.
73, Mike
www.w0btu.com
On Sat, Jun 16, 2012 at 5:29 PM, Bill Cromwell wrcromw...@gmail.com wrote:
On Sat, 2012-06-16 at 16:09 -0500, Mike Waters wrote:
Well, I plan on trying to enjoy the contest a little, even though all I
can do today is listen. :-)
Listening
I agree with Jim. Beverages don't have to be ideal to work very well
indeed, thank you. It's the matching transformers (and maybe their grounds)
that are a more important thing to worry about.
You need not worry that trees and bushes will attenuate the signal at HF.
Lots of people have installed
Speaking of flooded coax...
I noticed something recently about at least one of my spools of flooded
quad-aluminum-shield RG-6. Since the flooding compound is only in the
outer shield (the braid right under the outer jacket), it seems possible
that under certain circumstances, water could still
Hi Tom,
I'm not saying it's a good idea, or that anyone should. :-)
I'm just asking, What might happen if water got in there, wicked along the
inner braid, causing corrosion?
My gut feeling is that since the outer braid is protected from corrosion,
the answer would be 'nothing that would really
All the RG-6 CATV stuff I have is quad shield. From the outside to the
inside:
1. Outer jacket
2. Flooded alum. braid
3. Alum. foil
4. Unflooded alum. braid (is there such a word? :-)
5. Alum. foil bonded to dielectric
73, Mike
www.w0btu.com
On Fri, Jun 22, 2012 at 1:46 AM, Guy Olinger K2AV
Does there always need to be electrical continuity between the various
shields along the length of coax? I don't think so.
According to
https://awapps.commscope.com/catalog/broadband/product_details.aspx?id=46911,
both the inner and outer foil in the stuff we use are
Aluminum/Polymer/Aluminum.
They don't sell direct, Rune. Here's their distributor list:
http://www.fair-rite.com/newfair/support.htm
The BN-73-202 binocular cores for Beverage transformers can be purchased
from https://www.amidoncorp.com/items/64 for about $0.50 each. They work
great.
The other place I get Fair-Rite cores
Where's a better place to get those cores, Carl?
Last time I bought 100 of them from Amidon, the cost was about $0.60 each
when we factored in shipping.
Mouser does not stock them.
73, Mike
www.w0btu.com
On Sun, Jul 1, 2012 at 10:28 AM, ZR z...@jeremy.mv.com wrote:
The real Fair-Rite part #
Speaking of ferrite RX loops...
I picked up the July 2012 issue of Popular Communications from the local
grocery store's magazine rack, just to see what the unusual antenna on the
front cover was all about. It's called a ferrite sleeve loop, and is made
from a bunch of ferrite rods arranged into
Don't knock those deflection yoke cores! :-)
I've used a lot of those for RFI suppression over the years, especially the
last place I worked. They started calling me a wizard there after a
simple trifilar winding of #10 THHN around one of those ferrite cores
allowed their CNC machine tool
I don't know about you, but we have data that is far too important not to
make multiple backup copies ourselves. Think about whether you are willing
to take a of risk losing it all because the cloud had a glitch or closed
their doors.
A large cloud service corporation has made news headlines more
NO relay --or any other Beverage component-- will take a direct hit. :-)
There are some criteria we need to look for in a Beverage relay, but the
voltage rating is not necessarily one of them. It's important to provide
some relay protection against lightning-induced surges from nearby strikes.
Very good, Tom.
I still wonder what the answer is to my earlier question (in late June)
about a flooded quad-shield coax with a corroded inner shield.
I suspect with a bonded foil inner shield, not much would change.
73, Mike
www.w0btu.com
___
UR RST
I'm in full agreement with this, unless we consider our shack computer part
of our gear. :-)
I could not avoid a severe RFI problem on 75/80 meters without winding my
CAT5 network cable around some large #31 ferrite cores. Without that choke,
I can hear my TX signal in my computer speakers, which
That is crazy! It sounds like they're using something like MIG welding
wire. I thought I'd heard everything.
Another potential issue I see with wire like that is that the RF is bound
to penetrate that ultra-thin copper layer into the magnetic steel. (Boys
and girls, can you say eddy current
Thank you Jim, and all the others who have responded on- and off-list to my
question. :-)
73, Mike
www.w0btu.com
On Sun, Jul 22, 2012 at 12:01 PM, wa3...@comcast.net wrote:
C Rural wire is available from your local telephone company. ...
___
UR RST
We can place our conductors vertically if we have a narrow spacing (say,
~1), but how about using wide-spaced line (~12)? It doesn't take much
imbalance to affect the F/B ratio.
I think that Harold Beverage also came up with one bi-directional design
that completely dispensed with a reflection
I think the characteristics of so-called WD-1 surplus phone line varies.
FWIW, the two short samples of WD-1 that I have here are as follows:
115 ohms impedance, calculated from the following: .033 diameter
(averaged), .0685 spacing. The dielectric constant of the insulation
(polyethylene) is
Gary, was your 140 ohm WD-1A made from .0393 (1mm) diameter wires, spaced
.118 center-to-center? My math says that should be a little over 140 ohms.
But the stuff I was talking about was a different diameter and spacing
(.033 diameter and .0685 center-to-center spacing.) The same math says it's
This off-topic discussion about ticks (I've never worked T1CK on 160m ;-)
is certainly an eye-opener. Since I've moved to Missouri, I've certainly
had my share of tick bites, many of them from being out in the 'antenna
pasture'.
Around July 2008, something happened to me that my doctor never
Wayne,
What is more important than a little weak noise is common-mode signal. Why
don't you also test to see how well you can hear any AM broadcast stations
with the coax terminated?
Please also tell us more about your Beverage, especially how you are
feeding it (transformer, etc.)
FWIW, I
Wayne is using a DX Engineering bi-directional system. Unless DXE changed
to ununs without telling anyone, he has little to worry about there. ;-)
73, Mike
www.w0btu.com
On Tue, Jul 24, 2012 at 1:19 PM, Tom W8JI w...@w8ji.com wrote:
Most common issues, other than defective connectors or shield
I don't think carbon balls are suitable for lightning protection. Think of
the voltage drop that would appear across each ball during a direct hit. I
think they would vaporize.
At http://www.rossengineeringcorp.com/hv_spark_gap.htm lightning is not one
of the applications mentioned for their
://www.rossengineeringcorp.com/toroids_spheres_coronary_nuts.htm
Ross recommends carbon for lightning.
On Jul 27, 2012 9:33 AM, Mike Waters mikew...@gmail.com wrote:
I don't think carbon balls are suitable for lightning protection. Think
of
the voltage drop that would appear across each ball during
Once I bought my little Mapp gas/oxygen torch, I stopped using a propane
torch because I HATE the way the flame changes when you tilt it. For
soft-soldering in a remote location, we can adjust it so that it has a tiny
flame; and when hard (silver) soldering is more appropriate, we just open
the
On Sat, Aug 11, 2012 at 9:10 AM, Herb Schoenbohm he...@vitelcom.net wrote:
When drilling in stone to prevent overheating of the drill bit and tip
consider using water as a coolant.
You have to be careful doing that. Some types of carbide will instantly
crack from the thermal shock of cooling
Maybe you can hear better than I can, but it sounds like a fluke. I have
two VERY broadband 580' bidirectional Beverages, and I have never seen any
AM BCB spurs at 5 kHz points. I've only seen them at 10 kHz intervals.
What's worse here on the low end of 160 is those darned CW fish net
beacons.
That's exactly what I was thinking.
This is the preamp I use on my RX antennas:
http://www.w0btu.com/W0BTU-broadband-preamps.html . It's been in service
for many years and works great. Even with a 100 kHz to 30 MHZ bandwidth,
and with no input attenuation, it rarely overloads and produces spurs.
I've found that black Thomas Betts Ty-Raps are UV resistant, at least in
the Ohio sun. I think the TB p/n was TY-525-M.
73, Mike
www.w0btu.com
___
UR RST IS ... ... ..9 QSB QSB - hw? BK
Did you mean black TB Ty-Raps from Home Depot?
On Fri, Aug 17, 2012 at 1:13 PM, Tom W8JI w...@w8ji.com wrote:
I know the Home Depot ones are not. They start to break after a couple
years. :-)
I've found that black Thomas Betts Ty-Raps are UV resistant, at least
in the Ohio sun. I think
Ok, let's not make this black and white, then. :-)
It goes without saying that both halves of the antenna (radials and the
vertical) must be present in order for the bottom-fed vertical monopole to
radiate. But I maintain that any far-field radiation from the radials is
way down from the
Thanks, Tom.
I should have stated that in the absence of radials, the coax will radiate
instead due to the common mode current on the outside of the shield. That's
a given.
Let's forget that I said a small number of symmetrical radials, and assume
a large number. You said With four radials
On Mon, Oct 1, 2012 at 9:35 AM, Tom W8JI w...@w8ji.com wrote:
I am strong enough to cause problems for many of them when they are in my
general area
Nearly every time I have ever called CQ on top of a fishing beacon on 160
--except the very weakest ones-- it disappeared. I assumed they
1, 2012 at 7:30 PM, Eddy Swynar deswy...@xplornet.ca wrote:
On 2012-10-01, at 8:17 PM, Mike Waters wrote:
Nearly every time I have ever called CQ on top of a fishing beacon on 160
--except the very weakest ones-- it disappeared. I assumed they changed
frequency.
I don't think
On Mon, Oct 1, 2012 at 7:38 PM, Merv Schweigert k...@flex.com wrote:
They do not change freq out here in KH6, if they did how in the world
would the boat know where to look for the beacon and DF it to find the
net??
I don't remember how they work. There was quite a discussion about this
The most effective way to get rid of one is to operate on, or very close
to, the beacon frequency. It takes some period of time, but if the owner
can't hear the beacon reliably he will program a new frequency. Several
nights of heavy activity near a beacon often results in a channel switch.
...
IF they are operating there illegally, it would not be malicious
interference. It would be like intentionally calling CQ on top of a CBer
on 10m.
But you make some good points.
73, Mike
www.w0btu.com
On Tue, Oct 2, 2012 at 12:21 PM, mstang...@comcast.net wrote:
... How do you know that the
Tom is absolutely correct.
I believe this eHam thread discusses the pertinent rules and regulations
pertaining to us jamming of an illegal station on the ham bands:
http://www.eham.net/ehamforum/smf/index.php/topic,84382.0.html
I don't make a practice of doing it, but I have seen CBers and
This is a great idea.
Apparently, this problem is going to get MUCH worse than it has ever been.
This needs to be addressed ASAP so that we minimize the effect that this
has on our enjoyment of 160.
If I had a list of fishnet beacon manufacturers and distributors, followed
by some relevant
I can't transmit on 160 right now, but I finally got my 2-wire Beverages
repaired today and we're sure looking forward to listening!
At least I think I got them fixed. (One was destroyed by a small tornado,
the other was damaged by horses).
Does anyone else notice that most signals tonight are
Somewhere, G3TXQ stated that the values he calculated at
http://www.karinya.net/g3txq/chokes/ were subject to stray capacitance. It
doesn't take much to throw the values in his charts there way off.
That's another reason to not recommend chokes like that as a general
solution. Even for a single
Tom,
Did you --or anyone else you are aware of-- ever A-B test a ~120' tower
against a ~300' tower on 160?
73, Mike
www.w0btu.com
On Wed, Oct 24, 2012 at 2:09 PM, Tom W8JI w...@w8ji.com wrote:
That's why I A-B test things for several months before deciding anything.
... I installed a 300
We know the radius of the earth and have a good idea of the takeoff angle
from a given monopole height. The unknown variable (to me, anyway) is the
approximate height of the reflecting layer in the ionosphere that affects
160m. I'm guessing that's not a constant by any means.
If we knew those,
Maybe I just abused/misused the term takeoff angle myself. :-)
73, Mike
www.w0btu.com
On Wed, Oct 24, 2012 at 7:13 PM, Tom W8JI w...@w8ji.com wrote:
What is your (or anybody's) definition/understanding of the term takeoff
angle?
Take off angle is the thing the fellow who wrote EZNEC wished
How strong of a signal can that enormous Yagi radiate into the USA on 160?
I have never heard them.
73, Mike
www.w0btu.com
On Wed, Oct 24, 2012 at 7:23 PM, k...@frontier.com k...@frontier.comwrote:
Radio Arcala - I have always believed that a horizontal antenna on 160m at
very high latitudes
Oops, I meant 910 kHz, not 920.
On Fri, Nov 2, 2012 at 8:40 PM, Mike Waters mikew...@gmail.com wrote:
Does anyone else have the constant carrier on 1820.0 at night? I've heard
it for weeks, and it's interfered with several DX stations that I was
trying to copy.
And I see I'm not the only
I understand that. I have heard weak spurs on multiples of 10 kHz that come
and go on the low end of 160 ever since I put up Beverage antennas here.
But the one on 1820 is the strongest I have ever heard, and it's there
often.
And several times in the last few weeks, weak DX stations have chosen
That is excellent advice! 160 is a band for vertically-polarized antennas
(such as an inverted-L or shunt-fed tower with radials lying on the ground.)
http://www.w0btu.com/160_meters.html
73, Mike
http://www.w0btu.com/Beverage_antennas.html
On Fri, Nov 9, 2012 at 1:41 PM, donov...@starpower.net
Have you ever thought of using a 2-wire bi-directional Beverage? They are
not complex at all. It only takes one more wire, two more simple
transformers, and one more run of coax. A remote relay and four extra parts
even lets you use just one run of coax for both directions.
If you run a single
84' + 104' ... I take it that's an inverted-L with a total length of 188'?
That's interesting, Guy.
I've been playing with different lengths of wire in EZNEC+ 5, for a 160
Inverted-L here with a 55' high vertical section, and would appreciate some
advice here. I'm leaning towards making mine
RG58/59 it is easier and potentially cheaper than open wire
feedline. Three transformers and no relays. (page 7-88 5th edition and
earlier editions as well)
Is there some reason that a pair of open wires are significantly better?
Grant KZ1W
On 11/9/2012 4:24 PM, Mike Waters wrote:
Have
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