One of the HFTA arrival angle charts shows the very low angles EU - PNW
on 80m. These are calculated values.
One way to measure arrival angles is to real time compare S/N on a
vertical vs a dipole. From good modeling, the specific antennas can be
"calibrated" gain vs elevation and the comparison of elevation gains
approximates the arrival angle. I've not done it, I'm sure it isn't easy.
Another article I read (9/14 Radcom) stated (80m)
“Very good” propagation – 7 SoCal stations averaged 5 degrees
“Poor” propagation - 10 east coast stations were 43 +/- 10 degrees
Verified by my 40ft high 80m dipole near Boston vs a 2L 100ft elements
80m beam at 157ft that does less well from Redmond.
To measure 160m arrival angles, it might take the full size dipole W8JI
had up at 300ft vs his verticals. His comments about relative
performance are interesting. w8ji.com (don't have the exact link)
I made a local club presentation about various 80m antennas & broadband
dipoles from PNW to EU. If anybody wants a copy, email me off list.
Grant KZ1W
On 9/25/2022 11:42, Artek Manuals wrote:
Grant
Having lived in both Spokane and Boston area I can validate you
observation in a general way and I am now in Florida where the game
still played differently again than either
I am REALLY INTRIGUED by you comment "Arrival angles for 80 peak at less
than 10 degrees" . How did you measure that? Actually "measuring" vs
hypothesizing has always confounded me when it comes to measuring ACTUAL
arrival angles
Dave
NR1DX
On 9/25/2022 10:25 AM, Grant Saviers wrote:
My perspective as originally a "1" in Boston and now residing near
Seattle, is the nickname "suffering sevens" is well applied to my
friends here in the Pacific Northwest.
Simply, for the PNW, distance isn't that meaningful - it's path that
matters (and latitude). What was easy in Boston at 42N is very hard
in Seattle at 48N re EU on both 80 and 160. The path is mostly over
land or ice and usually thru or around the edge of the aurora zone.
Arrival angles for 80 peak at less than 10*. OTOH, JA's- yawn. Almost
exactly the same 4790 miles either way, Seattle to Tokyo or London.
So when you hear a "suffering seven" in EU, reach out. We also get a
chuckle when "the band is open" messages get posted from EU and what
we hear is only noise.
I did get TB DXCC, all from PNW since 2018, so am not complaining.
Just want some more ;) .
Grant KZ1W
On 9/25/2022 00:12, Steve Ireland wrote:
G’day all
Some food for thought.
Like Roger G3YRO and others who were teenage UK radio amateurs in the
1960s/1970s I grew up radio-wise on 160m. In those days, the holy
grail was to work across the Atlantic from UK/Europe.
Nowadays, living in Western Australia, it seems quite funny to think
that working from Europe to into the east coast of North America is
something that is still considered as real DX working on topband, as
the distance is not relatively long and there is no shortage of
stations (in theory!) at either end.
Back in the late 1960s/early 1970s, UK stations (and others in
Europe) could only legally use 10W DC input, so working this distance
was really difficult and thus ‘serious DX’. However, as the 1970s
progressed, there were TL-922 linear amplifiers in use at various
G-DXers (but of course, ahem, never on 160m).
Some years after this, 400W output became both legal and commonplace
below 1832KHz in the UK.
Anyhow, my point is that the distance from Europe/the UK to east
coast USA is relatively short – from the UK’s Newcastle Upon Tyne
(where Roger lives) to New York is about 3,330 miles (about 5,360
km) as the crow flies.
This is a very similar distance from Perth, Western Australia to
Auckland, New Zealand – but no serious Southern Hemisphere topband
DXer would consider a contact between VK6 and ZL1 as a DX contact. 😉
On the other hand, Perth to Newcastle Upon Tyne is 9,056 miles
(14,574 km) while New York to Perth is 11,613 miles (18,690km). That
to me is DX. But Australia (Perth in particular) is a long way away
from anywhere else.
All a question of perspective, history and where you live I guess. 😉
Vy 73
Steve, VK6VZ/G3ZZD/VY2LF
Sent from Mail for Windows 10
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