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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 Somerville
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 received.
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.