uint32_t subalt = (1068 * maiden_ext) + (gps_getdata()->altitude / 20);

        ////////////////////////////////////////////

        // Encode extended maidenhead and altitude

        ////////////////////////////////////////////

        // Static set first char: balloon ID (invalid call)

        call[0] = '0';

        // Split into chunks of valmax 36, 26, 26, 26

        // Mask off following 3 26valmax fields

        uint32_t chunk = subalt / 26 / 26 / 26; 

        // Encode to callsign

        if(chunk < 10)

            call[1] = '0' + chunk;

        else

            call[1] = chunk - 10 + 'A';

        // Static set ID

        // Subtract off previous portion

        subalt -= (chunk * 26 * 26 * 26);

        // Mask off following 2 26bit values

        chunk = (subalt / 26 / 26);

        call[3] = 'A' + chunk;

        // Subtract off previous portion

        subalt -= (chunk * 26 * 26);

        // Mask off following 1 26bit values

        chunk = (subalt / 26);

        call[4] = 'A' + chunk;

        // Subtract off previous portion

        subalt -= (chunk * 26);

        // Remainder is the last call char

        call[5] = 'A' + subalt;

        engdata -= (chunk * 18 * 10 * 10 * 19);  

        // Mask of fields

        chunk = engdata / 10 / 10 / 19;  

        // Encode to grid locator

        loc[1] = 'A' + chunk;

        // Subtract off previous portion

        engdata -= (chunk * 10 * 10 * 19);  

        // Mask off fields

        chunk = engdata / 10 / 19;  

        // Encode

        loc[2] = '0' + chunk;

        // Subtract

        engdata -= (chunk * 10 * 19);  

        // Mask off

        chunk = engdata / 19;  

        // Encode

        // Subtract

        engdata -= (chunk * 19);  

        // Mask off

        chunk = engdata;  

        // Encode

        uint8_t powers[] = {0, 3, 7, 10, 13, 17, 20, 23, 27, 30, 33, 37, 40, 43, 47, 50, 53, 57, 60};

        dbm = powers[chunk];

    }

    else

    {

        call[0] = call_orig[0];

        call[1] = call_orig[1];

        call[2] = call_orig[2];

        call[3] = call_orig[3];

        call[4] = call_orig[4];

        call[5] = call_orig[5];

        call[6] = call_orig[6];

        dbm = DBM_ORIG;