Hi all,
Over at the Elecraft-KX io group, being QRP all the time we had this
discussion a while back and I wanted to repost a post I made with a
useful link, I think it is germane to this discussion:
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Good Evening,
Conditions were so so on both bands. Noise was down, QSB was
moderate, and signals were medium too. Forty meter was not as strong as
I had expected. Fire danger is high in Oregon, less so in California.
They had some rain last week. The smoke came back this morning when
Sunday 9pm ET (summer and winter) on 3775 kHz
Thanks to these checkins and relays:
WB9JNZ Eric IL (sorry didn't write down the rig, was it
the K3S or the K4?)
W5SV Dave K4D TX
WM6P SteveK4D GA
WD6CQO Marshall Kenwood TX (sorry couldn't copy the Kenwood
Ghost or Carolina Reaper chilies, yes! RF or poison oak...NO!
73,
Ed N3CMI
-Original Message-
From: elecraft-boun...@mailman.qth.net On
Behalf Of Hank via Elecraft
Sent: Sunday, September 25, 2022 7:13 PM
To: Wayne Burdick
Cc: elecraft@mailman.qth.net
Subject: Re: [Elecraft] Elecraft
Sometimes the burn feels good!
> On Sep 25, 2022, at 7:17 PM, Wayne Burdick wrote:
>
> No. But try on a little poison oak followed by a hot shower. OMG. That’s the
> nice burn.
>
>
> elecraft.com
>
>> On Sep 25, 2022, at 12:11 PM, Fred Jensen wrote:
>>
>> There is no such thing as
That's a pretty interesting set of tests. Thanks!
It would have been more interesting, though, if they had duplicated the
tests without the counterpoise, and without the length of coax from the
rig to the antenna. My point all along has been that for these short
loaded whips that the
No. But try on a little poison oak followed by a hot shower. OMG. That’s the
nice burn.
elecraft.com
> On Sep 25, 2022, at 12:11 PM, Fred Jensen wrote:
>
> There is no such thing as a "nice" RF burn.
>
> 73,
>
> Fred ["Skip"] K6DGW
> Sparks NV DM09dn
> Washoe County
>
> Steve L
Too much science for one Sunday. We could all just strap in, take a hike, and
get on the air.
elecraft.com
> On Sep 25, 2022, at 3:21 PM, Jim Brown wrote:
>
> On 9/25/2022 1:43 PM, Bill Mader wrote:
>> Putting the results in a spreadsheet quickly makes antenna configurations'
>>
On 9/25/2022 1:43 PM, Bill Mader wrote:
Putting the results in a spreadsheet quickly makes antenna configurations'
difference apparent. I have done something similar using the RBN, two
antennas, and two nearby frequencies on the same band. This method
effectively identified which antenna was
One could also consider, "HF Vertical Performance-Test Methods and Results"
by N0AX and K7LXC, 2000. Available from Champion Radio Products or DX
Engineering.
They set this up as a reasonably reproducible test method to allow at least
somewhat comparable results accepting the inevitable
Dave, if you’d like to see a reasonably controlled test of radiators, you might
want to take a look at the 2002 HF Pack Vertical Antenna Shootout Results. The
antennas range from full size to a resistor with a short whip.
https://www.qsl.net/hfpack/antennas/shootoutvertical2002.html#vertical
I intend to do that. I probably will also test the resistor with and
without a whip ... i.e., four combinations.
I don't expect a resistor to do as well as the AX1 because the AX1 is a
partly reactive load that doesn't absorb energy like a resistor would,
but we don't really know how lossy
If the signal in your AX1 test is significantly stronger with the
counterpoise it would be interesting to also compare using a resistor
vertical with counterpoise post as you previously posted.
John KK9A
David Gilbert ab7e wrote:
To be a proper comparison, the AX1 needs to be out it the clear
It has been 21 weeks since this post and to my knowledge there has been no
updates. I placed my order for a group 4 part 75 weeks ago and it has yet to
appear in my package box.
John KK9A
Eric Swartz WA6HHQ wrote:
Hi Everyone,
I apologize for not posting this update last week. It was quite
Dave is getting closer to a valid test. However, testing on two different
days (rig and antenna inventory) is not quite useful for obvious reasons,
mostly propagation conditions.
A better method is to use a "standard" dipole and two WSPR transmitters;
one on the dipole and another on the two
Personally, I only care about a pure comparison test in as controlled
circumstances as possible. Any practical test like you describe will
have so many variables that it won't be useful for anything other than
as an anecdote. "Ground" is going to be wildly different depending upon
Hi Dave,
I think that's a proper comparison in a physics sense, but I don't think it
fully represents how the AX1 is deployed in practice.
I would run both an ideal scenario -- the one you described -- amd a
practical scenario -- something like a KX3 + internal batteries on a picnic
table, AX1
It would be interesting to see the results of a fully double blind
scientifically reproducible test done with traceable engineering quality
test equipment on a closed pedestrian mobile track.
NU6T
On Sun, Sep 25, 2022, 12:19 PM David Gilbert wrote:
>
> To be a proper comparison, the AX1 needs
To be a proper comparison, the AX1 needs to be out it the clear away
from anything else, preferable at a height that allows the counterpoise
to be hanging straight down with the end maybe a foot or two off the
ground. Measurements should be with the AX1 at the same height above
the ground
There is no such thing as a "nice" RF burn.
73,
Fred ["Skip"] K6DGW
Sparks NV DM09dn
Washoe County
Steve L wrote on 9/24/2022 6:36 PM:
Caution when using this location: Make sure your counterpoise is insulated and
there’s no way to contact bare metal at this point with your hand when using
Thanks Wayne for the encouragement. Since I’ve become involved in our local
club-Portland Amateur Radio Club, or PARC , we’ve encouraged members to get out
of the home shack and try outdoor operating. As is true with many urban
dwellers we all fight noise and space issues,and no better way to
Every conductor attached to the radio’s case (ground) will become part of the
counterpoise. Including your body, and any other objects that are conductive
that capacitively or resistively couple to the ground.
This is one of the many reasons why an ATU is needed to compensate for
electrically
You might try running the same test with-- say 12 turns of cable on a
Mix31 FT240 core, on every cable leaving the transmitter.
73, and thanks,
Dave (NK7Z)
https://www.nk7z.net
ARRL Volunteer Examiner
ARRL Technical Specialist, RFI
ARRL Asst. Director, NW Division, Technical Resources
On
How long is the power cable? Is it possible it's using that as a
counterpoise?
On Sun, Sep 25, 2022, 10:07 Ron Gruner wrote:
> I've just run two tests of my WSPR/AX-1 set-up with and without a
> counterpoise. Each test ran 24 hours over the last couple of days. Here are
> the results:
>
>
I've just run two tests of my WSPR/AX-1 set-up with and without a
counterpoise. Each test ran 24 hours over the last couple of days. Here are
the results:
COUNTERPOISE?
YES NO
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