ALL
I have tested RBN / skimmer raw data and Excel with preprocessing with CSVed to
confirm station performance after many major CW contests I have been in.
In order to see how a station covers a certain target area, I typically take
one hour timeslots, one country or in the case us US, one
Hello Mike
You forget that on this side of the pond, the majority of us live on pocket
handkerchief sized plots. :-)
The representative of a major building company in the UK was on TV yesterday
saying that 1000 sq ft was plenty big enough for a three bedroomed house.
I imagine that would be the
Iceland: three people per square km
- Original Message -
From: Tracey Gardner lt;tracey.gard...@talktalk.netgt;
To: topband@contesting.com
Sent: Wed, 20 Aug 2014 02:30:49 -0400 (EDT)
Subject: Topband: Skimmer calibration
Hello Mike
You forget that on this side of the pond
Iceland: three people per square km. :)
- Original Message -
From: Tracey Gardner lt;tracey.gard...@talktalk.netgt;
To: topband@contesting.com
Sent: Wed, 20 Aug 2014 02:30:49 -0400 (EDT)
Subject: Topband: Skimmer calibration
Hello Mike
You forget that on this side of the pond
- Original Message -
From: Tom W8JI w...@w8ji.com
To: topband topband@contesting.com
Sent: Tuesday, August 19, 2014 10:08 PM
Subject: Re: Topband: Skimmer calibration
BC antennas have the elaborate radial system in order to get that
groundwave while the typical on ground ham
I said:
That just isn't factual at all. Radials under the vertical antenna have
virtually no effect on wave angle unless they are sparse and grossly
unbalanced, allowing them to radiate like a low horizontal antenna.
Radials change the efficiency, not the pattern, unless the radials
radiate
I said:
That just isn't factual at all. Radials under the vertical antenna have
virtually no effect on wave angle unless they are sparse and grossly
unbalanced, allowing them to radiate like a low horizontal antenna.
Radials change the efficiency, not the pattern, unless the radials
On Tue,8/19/2014 7:08 PM, Tom W8JI wrote:
Radials under the vertical antenna have virtually no effect on wave
angle unless they are sparse and grossly unbalanced, allowing them to
radiate like a low horizontal antenna.
Radials change the efficiency, not the pattern, unless the radials
- Original Message -
From: Jim Brown j...@audiosystemsgroup.com
To: topband@contesting.com
Sent: Wednesday, August 20, 2014 12:48 PM
Subject: Re: Topband: Skimmer calibration
On Tue,8/19/2014 7:08 PM, Tom W8JI wrote:
Radials under the vertical antenna have virtually no effect
precision
measurements.
73
Juan EA5RS
-Mensaje original-
De: Topband [mailto:topband-boun...@contesting.com] En nombre de Tom W8JI
Enviado el: lunes, 18 de agosto de 2014 20:26
Para: topband@contesting.com
Asunto: Re: Topband: Skimmer calibration
Since no one likely knows the gain
When I last investigated, all the skimmers and Web SDRs that were outside
of North America all had terrible receive antennas for copying DX signals
on 160. (And who knows how many of them are in quiet locations?)
When I say terrible, I mean small magnetic loops, very short whips, low
dipoles, a
: Topband: Skimmer calibration
When I last investigated, all the skimmers and Web SDRs that were outside
of North America all had terrible receive antennas for copying DX signals
on 160. (And who knows how many of them are in quiet locations?)
When I say terrible, I mean small magnetic loops, very
the gw8izr skimmer seems pretty good to me...dr1a also...both, better than
average, IMHO
a belgian one also ( can't remember the call..) couple in JA also..
73, w5xz, dan
On Tuesday, August 19, 2014 4:33 AM, Mike Waters mikew...@gmail.com wrote:
When I last investigated, all the
I quickly noticed that some skimmers seem to have more effective antenna
systems than others.
More than S/N, I look at kinda the breadth and depth of where I'm spotted.
On 160M, GW8IZR and DL1A are where I'm first spotted. If I'm getting
spotted more broadly or deeply than that, then I know
Do we really care that skimmers aren't hooked up to antennas with
pattern and gain? One of the things in using VOACAP is knowing the
pattern of the RX antenna as well as TX. Omni pattern at RX removes RX
antenna bias. Why shouldn't we specifically use omni on RX, so that
any enhancement is from
Depends what are you expecting from Skimmer-RX-ANT setup.
If you want skimmer to find DX before the pack and looking for low angle
signals, then setup better use antenna with proper low angle vertical
pattern. Also getting true report when evaluating beach antennas with
low vertical angle,
Do we really care that skimmers aren't hooked up to antennas with
pattern and gain? One of the things in using VOACAP is knowing the
pattern of the RX antenna as well as TX. Omni pattern at RX removes RX
antenna bias. Why shouldn't we specifically use omni on RX, so that
any enhancement is from
Do we really care that skimmers aren't hooked up to antennas with
pattern and gain? One of the things in using VOACAP is knowing the
pattern of the RX antenna as well as TX. Omni pattern at RX removes RX
antenna bias. Why shouldn't we specifically use omni on RX, so that
any enhancement is
BC antennas have the elaborate radial system in order to get that
groundwave while the typical on ground ham vertical loses a lot of the
0-10 degree (or more) radiation. Go to the beach to get it back.or go
with elevated radials.
That just isn't factual at all. Radials under the
I am not a Skimmer expert, and am just asking. Question: Are all the
Skimmers individually(and collectively) calibrated in concert? Can one rely
on them for comparing scientific data and conclusion to prove or ascertain a
point?Val
Val,
A live comparison of S/N ratio or relative level
There's a lot of scatter in the dB measurements from skimmers. If I see
dozens of spots graphed on the reversebeacon spots comparison tool then I
can believe systemic differences like 3-5dB. But I could never draw that
conclusion over a single pair of spots.
Any given skimmer will spot a given
It's also worth mentioning that you can evade the Skimmer's wait 10
minutes before re-spotting limitation simply by QSYing 500 Hz or
sobefore re-sending - that way you can get a lot of data points in a
relatively short period. So long as you use TEST as your keyword rather
than CQ, and stay
On Mon,8/18/2014 4:53 AM, Tom W8JI wrote:
A live comparison of S/N ratio or relative level over time is with
very few exceptions an excellent comparative test. It is much more
accurate than S meters or absolute levels without a comparison
reference. As such, the RBN is a great tool for
Sent: Monday, August 18, 2014 12:47 PM
Subject: Re: Topband: Skimmer calibration
On Mon,8/18/2014 4:53 AM, Tom W8JI wrote:
A live comparison of S/N ratio or relative level over time is with very
few exceptions an excellent comparative test. It is much more accurate
than S meters or absolute
Hi Guys,
Thank goodness the QRP-types amongst us all don't seem to be so fixated
obsessed with such intricate minute details...
If they were, most would probably never even get on the air with their
peanut-powered rigs...and why would they? There'd most likely be assaulted by
dozens of
We were talking about validating or debunking people's RX experience
at the shore in various relationships to the edge of salt water. And
the anecdota included just about any signal around, on whatever path
and whatever TX takeoff angle, not just the signals of a few specific
TX stations.
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