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Sending extended call signs or 6-character locators in WSPR requires two WSPR transmissions. At the receiving end it makes use of the 15-bit hash-code to match up the the two transmissions. There are several disadvantages. The requirement that two transmissions are received reduces the probability of successful decodes. Furthermore since the hash-code is only 15 bits there is quite a high probability of a clash with other WSPR users having the same hash code.?

In my opinion extended format WSPR should be avoided except in cases where you need the higher resolution of 6-character Maiden head grid subsquare for example, if you are tracking a mobile transmitter.?

If you want to differentiate between transmissions from two different locations, using the same callsign, there are other ways to do it than using the double-transmissions and its inherent disadvantages. If the locations are far enough apart to be in different grid squares you'll be able to differentiate them easily anyway. Another way is to transmit in different time slots e.g. one station starts at 2, 12.22 etc minutes past the hour and the other at 4, 14, 24, etc. Or you could configure them to have different indicated power levels - it is only a coarse approximation anyway and if your TXs are both putting out 3W say, it will not matter and nobody will care, if you set one of them to 33dBm and one to 37dBm.?

These are the workarounds I can think of.?

Hello Cristi