Hi Nick,
All of my receiving antennas have been removed until October and the four
verticals in my 4-square vertical array have been disconnected. I can be
quickly QRV with the verticals when desired
73
Frank
W3LPL
On 2019-04-13 03:31, uy0zg wrote:
> Hi
>
>
> What happened ?
>
>
> One NV3
Hi Ray,
The classic source for Fresnel zones as they apply to HF site selection
is NBS Technical Note 139:
https://nvlpubs.nist.gov/nistpubs/Legacy/TN/nbstechnicalnote139.pdf
While Technical Note 139 applies primarily to horizontally polarized
antennas mounted above the ground, its gener
Hi Sinisa,
See the last paragraph in this email for a very specific answer to
Ray's original question...
Your comments about applying this 57 year old classic publication
are exactly correct.
First determine the desired elevation angle(s), t hen select the antenna
height that optimally
This article in Nature forecasts that we're approaching a grand solar
minimum -- similar to Maunder Minimum -- starting in 2020
and lasting for three solar cycles. I hope these scientists are wrong...
www.nature.com/articles/s41598-019-45584-3
An international panel of experts coordinated
Using currently available observational data, predictions and
prediction uncertainties have been calculated for Solar Cycle 25.
The results, based on both the sunspot number series and observed
magnetic fields, indicate that the upcoming Solar Maximum
(Solar Cycle 25) is expected to be sign
Hi Mark,
I suspect the current -- and hence the radiation -- from the bottom of
the vertical radiator is somewhat suppressed by proximity to gull wing
radials.
When I first installed a 160 vertical using two gull-wing resonant
radials eight feet high I had to increase height of the vertica
Rotten Damped Spark Stuff
http://p1k.arrl.org/pubs_archive/2989
- Original Message -
From: "W0MU Mike Fatchett"
To: topband@contesting.com
Sent: Wednesday, July 31, 2019 10:30:27 PM
Subject: Re: Topband: Summer Update & a Surprise
Same thing was said about SSB.
The sky is
Hi Bob
The "how to" article is right here:
http://p1k.arrl.org/pubs_archive/63144
73
Frank
W3LPL
- Original Message -
From: "Robert Brennan via Topband"
To: "Cecil"
Cc: "rich k7zv" , "Harald Rester"
, "Alan Swinger" ,
topband@contesting.com
Sent: Friday, August 2, 2019
Hi John,
Horizontal polarization isn't very effective on topband except for local
QSOs. It would be far better if you could install an inverted-L vertical
73
Frank
W3LPL
- Original Message -
From: "John Harper"
To: topband@contesting.com
Sent: Thursday, August 15, 2019 11:57:
These recordings are an impressive demonstration of the benefit of
one dB of signal strength improvement in a weak signal situation.
Click on the links on this website:
www.ab7e.com/weak_signal/mdd.html
73
Frank
W3LPL
- Original Message -
From: "David Gilbert"
To: elecr..
Hi Pete,
Unless you're planning more than 30 radials eventually, there's no reason
to install radials longer than the 50-60 feet you're already using.
This is one of several classic references on the topic. See
see Figure 3 and the 160 meter column in Table X:
https://ncjweb.com/bonus-co
Just purchase them, they're not expensive. For example:
www.antiquelampsupply.com/3-8-dia-brass-ball-tap-6-32f.html?gclid=EAIaIQobChMI_auMy7GI5QIVho7ICh2C4wEvEAQYAyABEgJFGPD_BwE
73
Frank
W3LPL
- Original Message -
From: "Jeff Blaine"
To: "topband"
Sent: Sunday, October 6, 20
Cecil,
Please think again.
Many topbanders use antennas and feedlines that extend beyond
a 500 meter diameter circle. Please don't disparage us.
73
Frank
W3LPL
- Original Message -
From: "Cecil"
To: "thorvaldur S T E F A N S S O N"
Cc: "Greg - ZL3IX" , "topband"
Sent: S
Beverage performance is optimum when installed over poorly
conductive soil. Harold Beverage's first "Wave Antenna"
(later named after him) was a BOG several miles long (used at 50 kHz)
laid on sandy Long Island, NY soil.
In order to achieve good directivity (especially front-to-side ratio)
i
Hi Dave,
In order to get benefits from diversity your 8-circle needs to be very
far away from your Beverages. If they are separated less than 500 feet
the fading will be nearly perfectly correlated and there will be no
diversity effect.
I get excellent diversity performance with my Beverag
Topband was fairly quiet tonight with the usual dozen or so European stations.
I decided to try FT8 for the first time on Topband. I've used it for several
years on 6 meters mostly during the Transatlantic sporadic-E season but
never on Topband.
Much to my surprise after just one CQ, I put
According to E21EIC, hams in Thailand now have the full 1800-2000 KHz
assignment.
Look for HS0ZAR before and their multi-multi operation in the CQWW CW DX
contest.
73
Frank
W3LPL
_
Searchable Archives: http://www.contesting.com/_topband - Topband Reflector
Hi Tony,
George's advice is good. A few additional points:
- you should also install a 100-150 uH choke across the coaxial
connector going to your radio, it will protect your radio from the
DC voltage if the capacitor shorts out.
- its very, very important that all of your connectors be
Hi Pete,
If your K9AY is near your transmitting antenna, it may be re-radiating
signals into the K9AY loops. You may need to use a relay to detune
the transmitting antenna while receiving, typically my lifting the connection
to between the coax and the antenna
73
Frank
W3LPL
- Ori
The forecast consensus: Cycle 25 will peak in July 2025 (+/- 8 months),
with a smoothed sunspot number of 115.
Cycle 25 is forecast to be average in intensity and similar to Cycle 24.
The panel concurred that solar minimum will occur in April 2020 (+/- 6 months).
If their solar minimum pre
I gave a presentation on the history of transoceanic radio communications
to the Frankford Radio Club a few days ago.
www.youtube.com/watch?v=pLN0MMxCvlc
My presentation covers radio technology development from the Maxwell's
mathematical description of electromagnetic waves in 1860-186
We've had 92 percent spotless days since May 19th.
The last time this happened was more than 100 years ago
when there were 93% spotless days from Feb 28 to Oct 24, 1913
books.google.com/books?id=SWdCAQAAIAAJ&pg=PA68&lpg=PA68&dq=daily+sunspot+number+1912&source=bl&ots=p-7Rhel4dI&sig=ACfU3U
Hi Mike,
Years ago my 4-square transmitting array used "gull-wing" elevated
radials sloping 45 degrees from the feedpoint at ground level to about
ten feet high.
When I replaced the radials with sixty 120-foot radials laid on the ground
I had to shorten the verticals by about five feet to
Nice job Alan! Many hams are now using those inexpensive filters so
they can share their Beverages among three bands without switching.
And -- as you noted -- the 160 meter filter does a good job significantly
reducing the signal level of AM broadcast stations below 1600 kHz.
73
Frank
W3L
Hi Csaba,
My experience is that an extensive radial system on the ground performs
significantly better than a few elevated radials. I suspect its difficult to
obtain nearly equal currents among a small number of elevated radials.
There is nothing wrong with gull wing elevated radials, but i
Hi Dave,
I remember K5IU's article well. I have no doubt such a system can be
made to work well.
However, I have no plans to replace my 30,000 feet of radials with
elevated radials...
Thanks
73
Frank
W3LPL
- Original Message -
From: "Artek Manuals"
To: topband@contestin
Mike,
I think the performance of a 4-square array may relate to the reason
why switching to 30,000 feet of radials made a dramatic improvement.
The currents in the elevated radial currents might be badly mismatched
by proximity to currents in nearby radials. I never tried to measure
them.
Climate scientist David Archibald speculates that Solar Cycle 24/25
minimum could be as late as March 2021 and that Cycle 25 maximum
might not occur until 2027.
wattsupwiththat.com/2019/12/22/solar-update-december-2019
73
Frank
W3LPL
_
Searchable Archives: http://www.con
Hi Roger,
My experience is consistent with almost all topband operators:
"160 needs vertical polarization for consistent long DX."
I've had 160 horizontal dipoles at 100 feet and 200 feet high and
I've never experienced a situation where their performance
approached the consistent excellen
Roger has 27 topband QSOs in my log since February 1993,
well done!
Its interesting how our transmitting antenna experiences are exactly
opposite on both 160 and 80 meters. I've had little success with
160 meter horizontal dipoles 100 to 200 feet high compared to
my 4-square vertical array w
How were conditions at W3LPL in Maryland last weekend?
Mark KD4D operated here last weekend using his call.
Conditions were good Friday night but with troublesome QRN from
nearby heavy rain storms. Fantastic on Saturday night with no
significant QRN.
110 ten-pointers were worked from 23
Hi Mike,
While I can't comment about Mark's specific experiences in this
contest, our usual rule of thumb is that you can never have too many
antennas.
We've found that the 8-circle isn't the best receiving antenna while
running because its sidelobe levels are so low that you often hear
n
Hi Dave,
From the Ohio/Penn DX Bulletin No. 1450 dated Feb 3 2020:
TT, CHAD (160m)
Nicolas, F8FQX (ex-TJ3SN, TN5SN, 5T5SN, TY2CA), who has
been in N'Djamena since December and plans to be there for the next 3-4
years, will be on various HF bands and 6 meters signing TT8SN. This
past wee
Hi Jim,
See www.qrz.com/db/TT8SN
73
Frank
W3LPL
- Original Message -
From: "Jim Brown"
To: topband@contesting.com
Sent: Thursday, February 6, 2020 6:02:11 AM
Subject: Re: Topband: TT8SN QRV CW
On 2/2/2020 5:02 AM, daraym...@iowatelecom.net wrote:
> TT8SN has been QRV on 16
Many of these old transmitting mica capacitors have reliability issues.
Their foil-mica technology is very obsolete and their molded enclosures
often leak moisture and contaminants. On the good side, unlike many
other capacitor designs they're capable of the handling high currents
and high volt
Send me a list of your transmitting capacitor needs needs.
Ten bucks each shipped to your door.
73
Frank
W3LPL
- Original Message -
From: "FZ Bruce"
To: "topband@contesting.com"
Sent: Saturday, February 8, 2020 8:09:10 PM
Subject: Topband: transmit antenna capacitors
Surpl
Hi Roger,
I heard you CQing early this morning (of course you were already in
the log). You had en excellent signal right up there with the best European
signals.
I hope you try again tonight
73
Frank
W3LPL
- Original Message -
From: "Wes"
To: topband@contesting.com
Sent:
Hi Roger,
Topband propagation to Europe was about as good as it gets this weekend,
except Sunday night when it was significantly depressed. I compared
your signal to the three other UK stations who were calling CQ at the
end of the contest The strongest were GM5X and GW5R, both
consistently
Hi Dave,
There were several speed demons who were shooting themselves in the
foot with endless high speed CQs. Why would anyone send hundreds
-- even thousands -- of unanswered high speed CQs on topband when
slowing their speed to 26-30 WPM (or even lower) will only improve
their topband res
Hi Pete,
Symmetrical T-verticals offer a performance improvement over
inverted-L verticals but with a major downside if you operate on the
higher bands. If the flat top of the T-vertical is near resonance on any
HF band is will significantly degrade the performance of any Yagi
antenna within
Hi Ed,
The affect of the T-vertical on a nearby HF Yagi is easily modeled in
EZNEC or your favorite antenna modelling program. You'll be surprised
by the results if the horizontal top is +/- 15% of resonance on 40 or 20
meters, for example. HF Yagi performance degradation occurs within ten
Hi Ed,
A T-top at right angles to a Yagi will have little affect, but anything
close to broadside is very bad within 500 feet or less on 40 meters.
Fortunately a 60 foot top is just short enough to have minimal affect.
70 feet would be much worse.
Any top longer than 40 feet should have l
There is a many, many Russians on 160 meter FT8...
- Original Message -
From: "W7RH"
To: topband@contesting.com
Sent: Thursday, February 20, 2020 3:01:41 PM
Subject: Topband: 160m activity and propagation
Greeting all,
This season has been interesting not because of highlights bu
Hi Ed,
Your conclusions based on your modelling are completely consistent
with my practical experience and modelling.
The most likely degradation is a T-top between 60 and 75 feet long
degrading the front-to-back ratio, pattern and gain of a 40 meter
Yagi when its main beam points into a T
Hi Paul,
If you model -- or build -- a 40 meter Yagi with a nearby T-top vertical
with a 60-75 foot top, you'll discover that when the 40 meter Yagi is
turned so that its elements are parallel -- or near parallel -- to a nearby
T-top the impact on the performance of the 40 meter Yagi is sever
Hi Paul,
A little modelling will answer the question more completely and
accurately than I can answer it in writing.
I was referring to the case where a 40 meter Yagi is on one tower and
a T-vertical with a top length of 60-75 feet is suspended between the
tower and a fairly nearby second
There's no shortage of 2N5109s on eBay for about one dollar each
www.ebay.com/sch/i.html?_from=R40&_nkw=2n5109&_sacat=0&_sop=15
73
Frank
W3LPL
- Original Message -
From: "VE6WZ_Steve"
To: "Richard (Rick) Karlquist"
Cc: "Topband"
Sent: Sunday, March 1, 2020 11:56:39 PM
Subj
One advantage of using Ebay is their excellent refund policies if
you get cheated. I've used it many times and never suffered a loss.
But you have only two weeks to file a claim.
73
Frank
W3LPL
- Original Message -
From: "Richard (Rick) Karlquist"
To: donov...@starpower.net, "To
My experience with LDF4-50 and LDF4-75 is exact;y the same as Peter's.
Its always best to use an antenna analyzer or TDR to cut all of the
cables to the same length. Its very, very easy to do.
- Original Message -
From: dj...@t-online.de
To: cl...@gm3poi.com, topband@contesting.com
"Sooner or later everything old is new again" (Stephen King)
February 1922 QST page 30
The 1BCG antenna used for the transatlantic tests was a T cage
over a radial counterpoise. The antenna is hung between two pipe
masts 230 feet apart, and 108 and 75 feet high, respectively.
The two hori
Hi Rick,
A noise receiving antenna close to a noise source is used in conjunction
with a higher performance receiving antenna such as a Beverage or an
array of short verticals and a passive or active noise canceller.
A small loop antenna provides a mechanically steerable null off of bot
W2MF also mysteriously disappeared...
- Original Message -
From: "uy0zg"
To: "Topband"
Sent: Thursday, March 19, 2020 4:44:14 PM
Subject: Topband: Miracles again ...
OK1RD disappeared from first place :
http://www.arrl.org/system/dxcc/view/DXCC-160M-20200319-USLetter.pdf
He v
Excellent skin depth reference here:
www.antennasbyn6lf.com/files/ground_skin_depth_and_wavelength.pdf
Ground characteristics are much more significant for vertical polarization
than for horizontal polarization.
73
Frank
W3LPL
- Original Message -
From: "Richard (Rick) Karlqu
N2MF also vanished from the 160 meter DXCC listings...
- Original Message -
From: "Ken Claerbout"
To: Topband@contesting.com
Sent: Monday, March 23, 2020 9:43:45 PM
Subject: Re: Topband: DXCC Committe
I don't wish to drag this debate out any longer than necessary, but
some credit
oops...
It was W2MF who vanished from 160 meter DXCC
A few weeks ago he was #296
Apologies to Brian N2MF #255
73
Frank
W3LPL
- Original Message -
From: donov...@starpower.net
To: Topband@contesting.com
Sent: Tuesday, March 24, 2020 4:08:11 AM
Subject: Re: Topband: DXCC Com
Hi Bob,
Bonding (not grounding...) coax to the bottom of a tower helps to
divert lightning currents from the coax shield to the ground system
at the base of the tower
Bonding coax to the top of the tower helps to equalize the voltage
between the coax and the tower face. This helps to avoid
RG-17 has the same problem, but the Type LC connector (a giant F connector)
solved the migration problem the same way the F connector does.
73
Frank
W3LPL
- Original Message -
From: "Richard (Rick) Karlquist"
To: "Lee STRAHAN" , topband@contesting.com
Sent: Wednesday, April 8, 2
Hi Ed,
What is the frequency of your local BCB transmitter?
This is the best brickwall filter -- capable of handling 200 watts --
that money can buy. Its provides at least 40 dB of attenuation below
1700 kHz. Several PVRC members located within a few thousand
feet of a 50 KW 1500 kHz BCB
Ed,
If your receive loop has a preamp at its feed point, its very likely
that the preamp is being overloaded by the nearby BCB station.
If that's the case, a filter after the preamp will not help.
73
Frank
W3LPL
- Original Message -
From: "Edward"
To: donov...@starpower.net
It is with great sadness that I write this message.
It has come to my attention that Marty Johnson W3YOZ has become a silent key as
of 4-14-2020
I will post more information as it becomes available.
Kevin P. Lear W3XOX
Blair Co. ARES EC / ACS Officer
w3...@hotmail.com
814-934-250
Early this month SWPC published their official updated prediction of
Solar Cycle 25 in a new user-interactive graph format. Their updated
prediction is based on the results of NOAA's Solar Cycle 25 Prediction
Panel.
www.swpc.noaa.gov/products/solar-cycle-progression
SWPC f orecasts
Hi Steve,
Geomagnetic latitude isn't likely to be an issue in VK6, the geomagnetic
equator in your part of the world is about ten degrees north of the
geographic equator, it runs through the Phillipines and Viet Nam.
Your geomagnetic latitude is about the same as New York city.
But very po
Chicken wire laid on the ground makes an excellent RF ground
for Beverages and other antennas requiring a good RF ground.
73
Frank
W3LPL
- Original Message -
From: "Nick Hall-Patch"
To: "Chris Moulding" , topband@contesting.com
Sent: Tuesday, May 5, 2020 6:40:47 PM
Subject: Re:
VE6WZ has some good ideas for a Beverage in dense woods here
www.youtube.com/watch?v=ueHgrszoq6A
73
Frank
W3LPL
- Original Message -
From: "Fred Moeves"
To: topband@contesting.com
Sent: Saturday, May 9, 2020 10:49:36 PM
Subject: Re: Topband: 2 wire reversible Beverage- KF4ITA
Hi Ron,
A more reliable approach is a tuner in your shack. The extra coax
cable loss from elevated VSWR is insignificant on topband.
How high up the band do you want to go and at what maximum VSWR?
A resonant Rohn 25 160M vertical will be about 124 feet tall for
resonance around 1820
Thanks for your kind comments Ron, much appreciated.
Hope to meet you in Dayton in 2021
73
Frank
W3LPL
- Original Message -
From: "Ron WV4P"
To: "Tree"
Cc: "Frank Donovan" , "160"
Sent: Friday, May 15, 2020 4:10:36 PM
Subject: Re: Topband: 160m Vertical
Wow,
Incredible
Hi Fred,
Google: 160 meter receiving loop antennas
You'll get lots of good ideas for antennas you can build in
just a few hours with simple parts.
An 8 foot diameter loop will provide the best sensitivity,
but a smaller 4 foot loop will provide deeper nulls
You'll need a good preamp a
Hi Mark,
I've built countless dozens of Beverages and its absolutely true
that "Beverages just want to work."
About the only situation where they do not work is over highly
conductive soil such as salt marshes and ocean front locations
with salt water saturated sub-soils.
Signals rece
Hi John,
250 feet isn't a short Beverage on 80 meters, it should perform
superbly. In my -- now long ago -- professional life we built and
operated phased arrays of up to 64 Beverages all the way up to
30 MHz, feeding SDRs, and they worked superbly.
73
Frank
W3LPL
- Original Mes
Hi Greg,
Four to six feet is not too high for a Beverage on 160 through 40 meters
Beverage sensitivity improves gradually with increased height and th
rear lobe and sidelobes increase (directivity degrades) gradually with
increased height.
The only Beverages I ever installed lower than sev
I'm hoping that Mark will share his VSWR measurements with us,
otherwise he's asking for help but keeping us in the dark...
73
Frank
W3LPL
- Original Message -
From: "Mike Waters"
To: topband@contesting.com
Sent: Wednesday, July 1, 2020 5:43:23 PM
Subject: Re: Topband: Some exp
Hi Mark,
Its not correct to refer to a 250 foot Beverage operating on either 80
or 40 meters as a "short Beverage." That length is ideal for 40 meters
and excellent for 80 meters. Only on 160 meters should it be considered
a short Beverage with a very broad main lobes off the ends.
73
Fra
Hi Mike,
Think again :)
1610 is by far the most popular Travellers Information Station (TIS)
frequency, followed by 530 kHz, then by many frequencies above
1610 kHz
There are twelve TIS stations in Missouri, only five on 530 kHz
www.fcc.gov/media/radio/travelers-information-stations-s
Hi Hank,
You can search for licensed TIS stations by state and frequency here,
but just because they're licensed doesn't mean they're on the air...
www.fcc.gov/media/radio/travelers-information-stations-search
Callsign: WXK790 Licensee: PHOENIX, CITY OF
Radio Service: Public Safety Pool,
Daily variability of HF propagation is caused in large part by solar energetic
particle radiation carried by the solar wind, especially during the four years
closest to solar minimum when x-ray and proton radiation from solar flares are
less frequent and less intense.
The three-hourly Pl
As s olar cycle 25 is slowly gains strength, there are now two new cycle 25
sunspots on the visible disk, regions 2767 and 2768. Region 2768 rotated over
the northeast limb onto the visible disk early on Wednesday July 29th. This is
a very small, single unipolar sunspot with no penumbra, r
Hi Ron,
- Original Message -
From: "Tim Duffy"
To: "Ron WV4P" , "160"
Sent: Tuesday, August 18, 2020 6:32:11 PM
Subject: Re: Topband: Rohn 25 Vertical questions.
Hi Ron,
A simple installation should be adequate if you're not planning in-band
receiving capability while you'r
Hi Ron,
700-1200 foot spacing should provide good in-band receiving capability.
SDR receivers won't work for in-band receive, you must use a traditional
transceiver such as the K3, K4HD, FTdx5000, IC-7800 etc.
Micro-arcing is caused by transmitted RF jumping a spark gap.
Any metal-to-metal
Hi Dick,
If you're lucky enough to be able to install a receiving antenna about
1000 feet from your transmitting antenna, a separate high dynamic
range receiver or transceiver will be able to hear weak signals when
the main transceiver is calling CQ or working QSOs. In band receive
allows SO
Hi Rick,
A "magnetic" loop will provide at least a 20 dB null, that's good. But
it doesn't provide the weak signal receiving capability of a high
performance receiving antenna. Very small magnetic loops provide a
25 dB null but at the expense of much worse weak signal performance.
Like so ma
Hi Jim,
Congratulations on your ARRL Technical Service Award
Well done and well deserved!
www.arrl.org/news/arrl-technical-service-award-conferred
73
Frank
W3LPL
_
Searchable Archives: http://www.contesting.com/_topband - Topband Reflector
Many years ago I was involved -- peripherally -- with very large phased arrays
of Beverage antennas installed over very poorly conducting soil (almost
solid rock) in which ground rods were completely impractical and
ineffective. The design of these arrays predated the availability of
general pu
Hi Rick,
I'm not aware that any details of this phased array Beverage design
were ever published. M ost likely it was documented only in internal
government engineering reports.
These very large phased Beverage arrays continue to operate with
excellent results up to 30 MHz, some of its unu
Hi Bill,
The antenna feed point is where common mode signals on the outside
of coaxial cable shield most easily and severely degrade antenna
directivity. This a critical antenna performance issue for very low
signal level compact receiving antennas such as small loops and
short high impedanc
Hi Mark,
It can be very challenging to reduce common mode adequately to preserve
the directivity of low signal level antennas such as the YCCC 9 circle.
My preferred approach is to bury all cables interconnecting the amplifiers
at the base of each vertical and the phasing combiner/controller,
Leif Svalgaard of the W.W. Hansen Experimental Physics Laboratory at
Stanford University -- a highly regarded solar physicist -- predicts
solar cycle 25 SSN of 128 +/- 10.
According to Svalgaard:
"This prediction is near the average (123±21) of the 6 (now 7) precursor
methods that seem
Hi Lee,
Your testing will be inconclusive unless you inject water into your
connectors, or you could just move to Maryland where we get at least
45 inches of annual rainfall and it gets into everything thats not well
waterproofed
73
Frank
W3LPL
- Original Message -
From: "Lee
Recently I presented "The History of Trans-Atlantic Radio Communications"
to the Redwood Empire DX Association. Among other things, my
presentation discusses the 1921 trans-atlantic test which was closely
related to the early development of Top Band.
The REDXA video of my presentation i
Hi Kenny,
A single 580 foot Beverage is an excellent 160, 80 and 40 meter antenna.
I still have three of them (NE. S. W) even though I also have 8-circle
arrays for 160, 80 and 40 meters.
I've never used a pair of staggered Beverages with 350 foot broadside
spacing, these are ideas based
Hi Dave,
270 foot spacing is a good choice only if you're trying to eliminate
QRN from local RFI sources not propagating via the ionosphere.
Otherwise 350 foot spacing is optimum for suppressing QRM/QRN
arriving via the ionosphere
73
Frank
W3LPL
- Original Message -
F
Hi Bob,
While bonding the radials is desirable, its not essential. But you
must NOT cross the radials over each other.
The radials of a multi-element vertical array are usually bonded to
a common wire bisecting the verticals where they would otherwise
cross over each other. See this figure
Hi Carl,
If the insulation breaks down they will arc, potentially causing a fire
73
Frank
W3LPL
On 11/6/2020 4:27 PM, Richard (Rick) Karlquist wrote:
>
>
> On 11/6/2020 1:10 PM, Carl Clawson wrote:
>> Frank,
>>
>> “Must” is a strong word. What goes wrong if you cross them?
>>
>>
Hello Henk,
Most of the kinetic energy released from solar wind into the Earth's
magnetosphere and then its ionosphere is in contained in the velocity
of the solar wind. Much less energy is in the extreme high temperature
of the solar wind's magnetized charged particles and in its embedded
i
Always beware of any communication that begins "with all due respect"
- Original Message -
From: "Wes"
To: topband@contesting.com
Sent: Saturday, November 7, 2020 4:49:23 AM
Subject: Re: Topband: OT - Bonding Radials at Intersections
With all due respect, I must ask, how many megaw
Hi Bill,
Both the solar flux index and the sunspot number are proxy measures
of ionizing extreme ultraviolet radiation, the 10 nm wavelength of
UV radiation that ionizes the E and F layers of the ionosphere.
Solar flux index on the 90s mostly affects the higher frequency
bands, improving 1
Hi Arthur,
Persistent high speed solar wind speed contains significantly more
kinetic energy than transient high density solar wind.
High density solar wind is a transient event of solar wind origin often
occurring during the rising phase of the solar cycle as fast coronal
mass ejections
Hi Jeff,
Micro arcing can be excited by just a few volts of RF. While micro arcing
probably is n't a fire risk, micro arcing radiates low level phase noise
on transmitted signals. This is can cause a serious interference
problem to nearby receivers such as neighboring hams or co-located
rece
Hi Andy,
Your new end-fire array sounds excellent!
How are your two elements constructed?
What is the end-fire phase delay between your two elements?
Are the end fire elements actually 125 meters apart?
1/4 wavelength end-fire spacing would be 41 meters.
Spacings as small as 20 meters
Want to help FEMA help those in need? Here's an on-call job with the FEMA
Reservist program as an HF Operator:
www.usajobs.gov/GetJob/ViewDetails/585313700
73
Frank
W3LPL
_
Searchable Archives: http://www.contesting.com/_topband - Topband Reflector
Of course Lee is absolutely correct.
Many 160 DXers who have had difficulty with receiving antennas
have given up too easily during the troubleshooting process.
73
Frank
W3LPL
- Original Message -
From: "Lee STRAHAN"
To: topband@contesting.com
Sent: Tuesday, December 1, 2020
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