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On 07/04/2021 14:15, Bill Somerville
you have it correct. Dual messages
are also used for compound callsigns, in that case the "Prefer
Type 1 Messages" is not relevant.
On 07/04/2021 13:40, Julian wrote:
Does that mean that if you tick the type 1 box, it will only
send a callsign/4 digit locator and power, whether or not you
enter a 6 digit locator in the settings box?
Presumably, if it only sends 4 digit locators, the distance
will be to the centre of the IO80 square?
Is the "preferred type 1" actually a mandatory instruction to
use type 1 then, or are there circumstances where it can still
On 06/04/2021 21:01, Bill
06/04/2021 20:16, Julian wrote:
Can someone please explain the significance of the callsigns
being in <angle brackets>, the Locator getting
truncated when the callsign is not in angle brackets, and
the distance alternating, (58km is the correct one) on every
alternate period on wsjt and FST4W 120/300?
I can't see any explanation in the manual...
if a user enters a 6 character gridlocator into WSJT-X then
the 50-bit WSPR payload cannot covey that extra information,
instead the single message WSPR format is switched to a dual
message format where the callsign, 4 character gridsquare, and
transmitter power are sent in the first, and a hash code
representing the callsign, the 6 character gridlocator, and
the power are sent in the second. So long as you have received
the first message at some point, the hash code in the second
message will be translated back to a callsign. The angle
brackets tell you that the call was not in the message
If you have entered a 6 character gridslocator into WSJT-X but
do not want to send the two message protocol then you can
check the "Prefer Type 1 messages" option, as you have done.