Hi Mike
The problem with needing to see a CQ is that the dxpedition may rarely
transmit a CQ (some folks were reporting this yesterday). Then, stations
were working them by just calling. Majority were on the correct period,
most were above 1000Hz. From what I could see here about 90% of hounds were
calling correctly. Whether they could hear the dxpedition is another
matter.
Earlier this afternoon there was a run of CQ from them (or someone
pretending to be them) about 10dB stronger than they are here most of the
time (-18 to -20). During this spell there seemed to be no QSOs.
Charlie
_____
From: Black Michael via wsjt-devel [mailto:wsjt-devel@lists.sourceforge.net]
Sent: 30 June 2018 15:15
To: 'WSJT software development'
Cc: Black Michael
Subject: Re: [wsjt-devel] Observation on Expedition Mode
I have some observations too.
#1 Tons of ops calling KH7Z when they can't see them. I assume this only
causes problems as it's quite possible KH7Z with their honker antennas and
can see them but not the other way round. So KH7Z will put them in the
queue and try to process them taking up the limited slots they are using
right now (2 from what I've seen). IMHO the solution to this is pretty
simple....when you turn on Hound or switch bands you should be PREVENTED
FROM TRANSMITTING UNTIL YOU GET CQ FRO THE DX STATION. So, you would be
required to double-click on a CQ to allow transmitting. I noticed the the
Baker team gave a lukewarm endorsement of FT8 on their news update quite
likely due to this problem.
#2 We need to turn on spotting for the DX station so that PSKReporter and
Hamspots can work and also so JTAlert can produce alerts when the DX station
is received. Don't need to spot the hounds of course. Trying to figure out
what band is good for local ops would be much improved with automatic
spotting for us and for the DX team who could then see where their signal is
going as more teams use internet on site via satellite links.
de Mike W9MDB
On Saturday, June 30, 2018, 8:13:39 AM CDT, Grant Willis <vk...@bigpond.com>
wrote:
Joe,
An observation if I may about expedition mode. I see with KH1/KH7Z that the
number of Fox TX channels varies - I presume as they place more stations in
the queue. As expected, the power per channel drops the more channels
running so that the amplifiers can keep up. However, this has an unintended
consequence perhaps of potentially breaking QSOs. A few times now I have
started calling KH1/KH7Z on 20m when I am receiving them around -09 (but
with pretty low S-meter signal strength). Usually this is with 1-2 channels
running on their downlink. If they go to 3 channels I can still receive but
it falls to say -15. If they bring up channel 4 and 5 I loose them. There
just isn't the link budget left to receive them when the power is split
between more than 3 channels in this example.
Now the issue is, if they answer me by adding the 4th channel - I wont hear
them under those conditions. If I am part way through a QSO I can loose the
RR73 for the same reason if they answer someone else on the 4th channel-
simply because the link runs out of steam.
Now if I couldn't hear them in the first place I wouldn't have tried
calling. In this case however, they can disappear under load effectively and
I loose them mid QSO.
For future consideration perhaps is to have the setting of number of
channels vs the number of active channels maintain a constant PER CHANNEL TX
power rather than the variable situation we have now. Ie I enable my fox
station to run say 4 channels, but only reply on 1 channel, then the output
power should be the equivalent of the power that would be in that channel if
all 4 were in fact on air but aren't. At least that way I have a constant
link budget I am working with on my comms channel with the fox station
rather than one that can have them drastically cut power mid QSO without
reference to the conditions on the path I am working them via.
If what I am describing is not how it is supposed to work already then there
is another factor at work somewhere in the chain to be explored. I would be
happy to discuss this further and use the KH1/KH7Z expedition to observe and
learn more about how the multi-channel nature of the mode works.
Regards,
Grant VK5GR
----------------------------------------------------------------------------
--
Check out the vibrant tech community on one of the world's most
engaging tech sites, Slashdot.org!
http://sdm.link/slashdot_______________________________________________
wsjt-devel mailing list
wsjt-devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/wsjt-devel
---
This email has been checked for viruses by Avast antivirus software.
https://www.avast.com/antivirus
------------------------------------------------------------------------------
Check out the vibrant tech community on one of the world's most
engaging tech sites, Slashdot.org! http://sdm.link/slashdot
_______________________________________________
wsjt-devel mailing list
wsjt-devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/wsjt-devel
