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ssh from linux to windows - backtick output ended with '\r'

When setting a variable with the output of a command, the content of variable is not correct when passed through ssh command, but works fine within a ssh session.
Looks like remote interactive session with ssh enter Cygwin (uname -s = CYGWIN_NT-5.1), but remote command with ssh does not (uname -s = Windows_NT)

And ideas would be appreciated!

My tests, executing same command line to highlight problem

The following remote ssh command fail ($a ends with '\r'):
ssh frgbuild@win32-xp-ps 'echo "`uname -a`" ; set -x ; a=`uname -r` ; b=`uname -rs` ; echo "a=$a=EOA=" ; echo "b=$b=EOB=" ; set +x'
Windows_NT WIN32-XP-PS 5 01 586
++ uname -r
+ a=$'5\r'
++ uname -rs
=EOB=dows_NT 5
' b='Windows_NT 5
+ echo $'a=5\r=EOA='
=EOB=' 'b=Windows_NT 5
+ set +x

The following interactive ssh session is working:
ssh frgbuild@win32-xp-ps
$ echo "`uname -a`" ; set -x ; a=`uname -r` ; b=`uname -rs` ; echo "a=$a=EOA=" ; echo "b=$b=EOB=" ; set +x
CYGWIN_NT-5.1 Win32-XP-PS 1.7.4(0.225/5/3) 2010-04-07 11:02 i686 Cygwin
++ uname -r
+ a='1.7.4(0.225/5/3)'
++ uname -rs
+ b='CYGWIN_NT-5.1 1.7.4(0.225/5/3)'
+ echo 'a=1.7.4(0.225/5/3)=EOA='
+ echo 'b=CYGWIN_NT-5.1 1.7.4(0.225/5/3)=EOB='
b=CYGWIN_NT-5.1 1.7.4(0.225/5/3)=EOB=
+ set +x


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