多段デジピートに関連して、実験をしてみました。
詳細については、次の JA0CAW_blog のコメントを参照して下さい。
[URL]

JA0CAW>APRS,RS0ISS-4*,TETSU [01/06/08 10:16:45] <UI>:CQ CQ JA0CAW
JE9PEL>APRS,RS0ISS-4*,WAKKY [01/06/08 10:18:07] <UI R>:test
JE9PEL>APRS,RS0ISS-4*,WAKKY [01/06/08 10:18:28] <UI R>:GM JA0CAW
JA0CAW>APRS,RS0ISS-4*,TETSU [01/06/08 10:18:58] <UI>::JE9PEL   :GM ur599
JA0CAW>APRS,RS0ISS-4*,TETSU [01/06/08 10:19:07] <UI>:
=3755.25N/13907.29E-Niigata Japan JA0CAW {UISS51}
JA0CAW>APRS,RS0ISS-4*,TETSU [01/06/08 10:19:34] <UI>::JE9PEL   :WX vry fine 
JH1BCL>APRS,RS0ISS-4* [01/06/08 10:19:42] <UI R>:JA0CAW JE9PEL UR 599 TU
JE9PEL>APRS,RS0ISS-4*,WAKKY [01/06/08 10:19:55] <UI R>:digi test OK!
JA0CAW>APRS,RS0ISS-4*,TETSU [01/06/08 10:20:03] <UI>::JH1BCL-1 :GM ur599
JE9PEL>APRS,RS0ISS-4*,WAKKY [01/06/08 10:20:38] <UI R>:here fine today also!
JA0CAW>APRS,RS0ISS-4*,TETSU [01/06/08 10:21:02] <UI>::JE9PEL   :OK 73 GL
JH1BCL>APRS,RS0ISS-4* [01/06/08 10:21:18] <UI R>:JA0CAW TNX 73
JA0CAW>APRS,RS0ISS-4*,TETSU [01/06/08 10:21:51] <UI>::JH1BCL-1 :73 GL