Another thing you might do is disconnect the cable from the ladder line and run
a dummy load on it to make sure there are no breaks. You could then do the same
on the ladder line. When you're using the ladder line remember that you've a
50/300 or 50/450 ohm drop to deal with.
Tom
Tom Brennan KD5VIJ, CCC-A/SLP
web page http://titan.sfasu.edu/~g_brennantg/sonicpage.html