[Elecraft] KAT500 vs KAT3

[Ignacy]

Due to issues with Expert 2k-fa, I compared many SWR devices. SWR metering in
K3 is not very accurate although it is good enough. Without KAT3 turned on,
SWR in K3 may indicate 1.0 while LP100 shows 1.5, and vice versa. When if K3
indicates 1.0 it may be from 1.0 to 1.7. Additional problems are cause by
bad cables and uncompensated switches. The most accurate measurements IMHO
are with antenna analyzers. 

So perhaps there is no problem.

One way of indirectly measuring whether the match is OK is to check the
power at the antenna (at 100W) with either KAT3 or KAT500 while monitoring
the supply current. Similar output power and supply currents mean no
worries. At high real mismatch the current may higher or lower, with real
high not too good. 

Ignacy, NO9E



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