Hello Evan, I just open my L75 and that switch has two capacitors on the switched side that go to a common terminal on the other side of the switch. That terminal is not used by the switch. It appears to be a common junction point. >From that point I have a braided ground strip from that common terminal going to the ground terminal attached to the chassis about ½ inch away.
On the switch output side I have a connection from the switch to the high side of the loading capacitor. The switch is just switching in one of two fixed value capacitors across the loading capacitor to get the antenna loading in range for best match. Ron / WB4HFN From: [email protected] [mailto:[email protected]] On Behalf Of K9sqg Sent: Friday, February 04, 2011 12:38 PM To: [email protected] Subject: [Drakelist] L-75 question Fellow enthusiasts, Have a question about S2C in the L-75 linear, it is the wafer switch controlled by the lever on the front panel for use on 160 and 80 meters. The two switchable load capacitors are located from some terminals with one end of each cap going to a "common" terminal on the switch, and then a lead from there to ground. However, that "common" terminal is not connected electrically to any part of the circuit. Was just curious as to why the ground side of each cap is connected to an unused terminal when in fact there is a ground lug very close to that switch that could be used for the ground termination. I'm going to be replacing those caps and plan on using the ground lug rather than that electrically isolated switch terminal. But then, am I missing something here? I'm sure Drake had a reason for doing what they did, but I can't figure out what it is. At one time I thought that maybe it would be a simplified manufacturing process to mount the caps to the switch before installation but then that didn't make sense since a wire/braid had to be run from that terminal to the ground lug anyway. Your thoughts? 73, Evan, K9SQG
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