Hi all:
I have an SB-220 I have been using successfully on 17M for a few months now.
On the 15M bandswitch position I got a better match than on 20M and it's been
working well. I limited the output to 500W or less to give it a break here.
Yesterday it didn't want to load anymore- it "sputters" pretty loudly and the
meters jump around when the output reaches a couple of hundred watts. I wasn't
able to see into the enclosure to look for arcs, and I didn't hear any arcing
type noises but figured that must be the case and gave up. I'm using a
doublet fed with 450 ohm ladder line and tuner and the SWR was very good. It
still loads normally on 40M and 20M and gives full output. I'll try using a
dummy load today and verify that it is load independent. I'll also inspect the
coupling cap for arcing. Anything that I should suspect?
Any ideas why it would quit without any changes to the system?
Thanks- ' 73
Tim
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