Well I have a new one? I have recently noticed a discrepancy between the
SWR measured by my Orion (internal tuner disabled) and by my LDG DWM-4
wattmeter. I've checked the LDG meter with my Bird and all seems okay. So
I've tried to isolate the problem.
The problem disappears when I take the Hercules II out of the circuit. My
problem occurs on 20 metres with the rig showing an SWR of about 2.5 : 1 and
the external meter about 1.4 : 1. When I remove the Herc input and output
coaxes from the amp and connect them together with an Amphenol barrel
connector both meters read an SWR of about 1.4 : 1? With power, control and
keying loop cables removed the problem still exists.
Of course all of this is happening with the Herc off and the only components
I can see in the circuit are the input relay - K1 and the vacuum relay.
Both are unenergized and normally closed with a DC resistance of less than
0.5 ohms. I have checked 80 metres, 17 metres and 15 metres and the problem
does not occur there. It seems confined to 20?
Thoughts appreciated. Thanks.
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