Hello,

Operating PSK with a Cushcraft R5 and an Icom 746 on 20 metres and as 
happens in the UK at this time of the year we have heavy rain which 
comes very quickly.

I am aware that in this kind of weather the SWR of the R5 rises very 
quickly so that when it reaches about 1:4 the RF power reduces.

What I had not realised was that as the SWR went up, so did the ALC
Looking first at the SWR/POWER meter I saw the SWR going up and the 
power going down, then looking at the 746 I saw that the ALC, which 
before the sudden rain was not evident, was now showing four markers 
on the 746 scale. 

Why does this happen ?


Mel G0GQK





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