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Antarctica on WSPR, attached.

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- 73 de Andy -

On Wed, Apr 3, 2024 at 08:17 PM, Da Amazin' man G0FTD wrote:

There's a German supply ship / monitor down there.
DP0POL and another one to look out for.

DP0POL and DP0GVN.
?
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- 73 de Andy -

On Wed, Apr 3, 2024 at 05:09 PM, Ron VE8RT wrote:

As to my knowledge there are no WSPR monitors in the interior of
Antarctica, the expedition may not see longer DX than this as they're
approaching the north geographic pole.

There's a German supply ship / monitor down there.
DP0POL and another one to look out for.
I often get spots from down there using 400mw on just about any band and wet noodle.
Even done on indoor loops / hamsticks.
?
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- 73 de Andy -

Corrected distance reasoning, the maximum WSPR distance should be half of the circumference with a maximum error of one grid square if both the sending and receiving stations were at the borders of the grid square nearest to each other. Does that sound correct. A bit OT no doubt.

As best I know there is no way for WSPR Spots to calculate long path,
then I suppose WSPR does not represent propagation distance but the
distance between the grid square of the sending and receiving
stations. Maximum WSPR spot distance then is one grid square less (if
the reference point used for the calculation is the centers of the two
grid squares) than half of the circumference along the widest axis,
likely near the equator.

In that case the record distance may be between a WSPR equipped
nautical vessel and any antipodal station along the equator.

As the earth has a "squished spherical shape" is it flat at the
poles :-) ?

Thanks Hans, enjoying the QCX+, and wondering about how many WSPR
stations of your design will contributing to the data collection during
the North American total solar eclipse.

Ron VE8RT

On Wed, 03 Apr 2024 10:03:54 -0700
"Daniel Walter via groups.io" <nm3a@...> wrote:

Actually, you can have about 24,000 miles propagation distance. Long path that's just outside of ground wave and too close for skip.
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73, Dan? NM3A

--
Ron VE8RT <ve8rt@...>

As best I know there is no way for WSPR Spots to calculate long path,
then I suppose WSPR does not represent propagation distance but the
distance between the grid square of the sending and receiving
stations. Maximum WSPR spot distance then is one grid square less (if
the reference point used for the calculation is the centers of the two
grid squares) than half of the circumference along the widest axis,
likely near the equator.

In that case the record distance may be between a WSPR equipped
nautical vessel and any antipodal station along the equator.

As the earth has a "squished spherical shape" is it flat at the
poles :-) ?

Thanks Hans, enjoying the QCX+, and wondering about how many WSPR
stations of your design will contributing to the data collection during
the North American total solar eclipse.

Ron VE8RT

On Wed, 03 Apr 2024 10:03:54 -0700
"Daniel Walter via groups.io" <nm3a@...> wrote:

Actually, you can have about 24,000 miles propagation distance. Long path that's just outside of ground wave and too close for skip.
--
73, Dan? NM3A

--
Ron VE8RT <ve8rt@...>

Thanks, Dan !?

Thanks, Ron. That raised circle along with the dimple had be over-thinking it.?

Hi Rob,
I agree fully, hoping that Hans will find a solution. This is a crazy nice small radio, I love it. Would be a pity if there would be no solution.

BR
Heinz, DK4EZ??

Actually, you can have about 24,000 miles propagation distance. Long path that's just outside of ground wave and too close for skip.?
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73, Dan? NM3A

The question as to whether this is a record is because greater
distances are possible and may have been achieved along the equator.

The success of this endeavour speaks to the quality of the design and
components in a QCX+, mobile whip antennae are not necessarily good
matches to a 50 Ohm transmitter, the GPS receiver (also from QRP Labs)
works at extreme latitudes, there have been no software crashes. When
the QCX+ is shut down (when they stop and sleep) upon powering up it
picks up again without operator involvement.

No part of the system is expensive purpose built ruggedized gear. It
worked beyond hopes and expectations. Holding a record would be a
bonus though :-)

Ron VE8RT

On Wed, 3 Apr 2024 12:19:06 -0400 (EDT)
"Mike Besemer - WM4B" <mwbesemer@...> wrote:

Yes... I don't believe there are any monitors in the interior of Antarctica either. There is one that I hit pretty regularly that is located on the Northern periphery, but that's the only one I'm aware of.

Mike
WM4B

On 04/03/2024 12:09 PM EDT Ron VE8RT <ve8rt@...> wrote:


Our local 200mW VE8CK beacon, but on a long wire antenna is also heard
at those distances. A challenge to record setting between the poles is
that the Earth is not a perfect sphere, the circumpherence along the
equator being greater than through the geographic poles. Also I
believe that the WSPR distances are calculated between the grid squares
and not actual positions and are not precise. the online calculator
gives 11,133 miles as the equivalent of 17,917 km.

As to my knowledge there are no WSPR monitors in the interior of
Antarctica, the expedition may not see longer DX than this as they're
approaching the north geographic pole.

Ron VE8RT

On Wed, 3 Apr 2024 11:42:54 -0400 (EDT)
"Mike Besemer - WM4B" <mwbesemer@...> wrote:

That's roughly 11,000 miles, or pretty close to the distance from my QTH to Western Australia. I routinely get reception reports from Oz/NZ running 100 mW into a random piece of wire laying in my attic which I'm very certain has negative gain.

Antipode distances are about 12,427 miles on a long circle path, so the record could not exceed that distance.

Now if you're taking miles/watt, that's another story.

Mike
WM4B

On 04/03/2024 11:17 AM EDT Ron VE8RT <ve8rt@...> wrote:


Are there records for longest WSPR DX, and if so are they online?

Yesterday a distance of 17,917 km was reported under spots, the TX is
a QCX+ on 40M using a Hamstick antenna.



Ron VE8RT VE8TEA FP5EK

--
Ron VE8RT <ve8rt@...>

--
Ron VE8RT <ve8rt@...>

Yes... I don't believe there are any monitors in the interior of Antarctica either. There is one that I hit pretty regularly that is located on the Northern periphery, but that's the only one I'm aware of.

Mike
WM4B

Our local 200mW VE8CK beacon, but on a long wire antenna is also heard
at those distances. A challenge to record setting between the poles is
that the Earth is not a perfect sphere, the circumpherence along the
equator being greater than through the geographic poles. Also I
believe that the WSPR distances are calculated between the grid squares
and not actual positions and are not precise. the online calculator
gives 11,133 miles as the equivalent of 17,917 km.

As to my knowledge there are no WSPR monitors in the interior of
Antarctica, the expedition may not see longer DX than this as they're
approaching the north geographic pole.

Ron VE8RT

On Wed, 3 Apr 2024 11:42:54 -0400 (EDT)
"Mike Besemer - WM4B" <mwbesemer@...> wrote:

That's roughly 11,000 miles, or pretty close to the distance from my QTH to Western Australia. I routinely get reception reports from Oz/NZ running 100 mW into a random piece of wire laying in my attic which I'm very certain has negative gain.

Antipode distances are about 12,427 miles on a long circle path, so the record could not exceed that distance.

Now if you're taking miles/watt, that's another story.

Mike
WM4B

On 04/03/2024 11:17 AM EDT Ron VE8RT <ve8rt@...> wrote:


Are there records for longest WSPR DX, and if so are they online?

Yesterday a distance of 17,917 km was reported under spots, the TX is
a QCX+ on 40M using a Hamstick antenna.



Ron VE8RT VE8TEA FP5EK

--
Ron VE8RT <ve8rt@...>

That's roughly 11,000 miles, or pretty close to the distance from my QTH to Western Australia. I routinely get reception reports from Oz/NZ running 100 mW into a random piece of wire laying in my attic which I'm very certain has negative gain.

Antipode distances are about 12,427 miles on a long circle path, so the record could not exceed that distance.

Now if you're taking miles/watt, that's another story.

Mike
WM4B

I doubt that any such imperfection is terribly important, but smoothing it out can't hurt.?

However, I believe the imperfection is most likely secondary to the failure of the BS170, rather than the other way around.?
--
73, Dan? NM3A

Perfect!
--
73, Dan? NM3A

Are there records for longest WSPR DX, and if so are they online?

Yesterday a distance of 17,917 km was reported under spots, the TX is
a QCX+ on 40M using a Hamstick antenna.



Ron VE8RT VE8TEA FP5EK

There is an I/Q out in the QMX. It is a much smaller band than a SDR but it eliminates a power hungry component. I do remember Hans talking about making a narrow band scope on the QMX screen as a reach goal. It would tell you if signals were near by.?
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Colin - K6JTH?

Thanks for your inputs, but I've found and fixed it.

Somehow I mis-made the T507.? I made a full turn on the 1 turn loops.? Put it right and the sensitivity is great.

Thanks Again!!!

Great radio - now for testing transmitter. :)

Tim W8TWF

Could not agree more! Great guy!