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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

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

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@...>

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

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@...>

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

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@...>

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.
--
73, Dan? NM3A

--
Ron VE8RT <ve8rt@...>

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.
?
--
- 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.
?
--
- 73 de Andy -

Antarctica on WSPR, attached.

--
- 73 de Andy -

UK to New Zealand is the longest possible path to land from here. ? Repeat it most days on ?a QCX+5W

Bravo!
--
Chris / W2BPL

Thanks Chris,

I think I'm exceptionally outgoing at times. Not one to miss an
opportunity like this, to get propagation data from the far north, I
got a hold of their crew and asked about at least having a WSPR beacon
along. The Expedition crew got all the way to the hangar in
Yellowknife without anyone asking them if they'd be carrying amateur
radio of any sort along, duh!!! There is an amateur, hadn't been
active in decades, on board, but not even his amateur friends suggested
it. The QCX+ (not the QDX I just reported as having failed) I finished
building when they showed up. The QDX, and a pre-tuned hamstick, plus
the hardware and pages from the operating manual were put on our
freight flight to Cambridge Bay, NU, where their crew did the final
installation. The antenna was removed to get the vehicles indoors at
an unmanned station, Isechen Station, and not replaced until a few days
ago.

This leg of the expedition should end at Iceland, I'm asking them to
look into having a full HF station onboard before they start the drive
to the south pole.

Maybe I could suggest starting a campaign by radio amateurs to reach
out to the Expedition through their contact info on their webpage
to ask them to have more
amateur radio activity. Such a once in a lifetime IOTA activations has
been missed in the last few weeks :-(

Ron VE8RT

On Thu, 04 Apr 2024 07:11:26 -0700
"Chris / W2BPL" <kwaj.speedo@...> wrote:

Bravo!
--
Chris / W2BPL

--
Ron VE8RT <ve8rt@...>