D
Dave
- Jan 1, 1970
- 0
I am trying to protect my HF RF amplifier from static coming down the feed
line, and would like to bounce some ideas off a few actual EE's. I
currently have a neon bulb going from the center conductor of my coax to
ground, but this is far from satisfactory. It does nothing for charges
under the rated 125V. One person suggested putting a couple of back-to-back
diodes in parrallel with the neon bulb, and I had the idea of putting a 100K
multi-watt resistor in series with these diodes.
This would (I believe) protect the input to the amplifier by taking anything
over .6V to ground, and slowing the dissipation of a large pulse to protect
the diodes somewhat and possibly even cause the neon bulb to light up (an
indication of a less-than-ideal environment in which to operate a radio.)
Does this sound like an effective means of protecting said equipment from
incidental static charges following the coax in through my window? I have
already had a .22uF 50V polyethylene capacitor linking the coax to my tuning
capacitor blown by static, and replaced it with a .1uF 630V capacitor. This
"fuse" has so far remained intact, but I would like to augment it some and
further protect the project I spent so much time putting together and
troubleshooting. Anyone with any ideas is welcome to comment, cuss or
discuss. I am not an EE, and am open to any and all feedback.
Thanks,
Dave
line, and would like to bounce some ideas off a few actual EE's. I
currently have a neon bulb going from the center conductor of my coax to
ground, but this is far from satisfactory. It does nothing for charges
under the rated 125V. One person suggested putting a couple of back-to-back
diodes in parrallel with the neon bulb, and I had the idea of putting a 100K
multi-watt resistor in series with these diodes.
This would (I believe) protect the input to the amplifier by taking anything
over .6V to ground, and slowing the dissipation of a large pulse to protect
the diodes somewhat and possibly even cause the neon bulb to light up (an
indication of a less-than-ideal environment in which to operate a radio.)
Does this sound like an effective means of protecting said equipment from
incidental static charges following the coax in through my window? I have
already had a .22uF 50V polyethylene capacitor linking the coax to my tuning
capacitor blown by static, and replaced it with a .1uF 630V capacitor. This
"fuse" has so far remained intact, but I would like to augment it some and
further protect the project I spent so much time putting together and
troubleshooting. Anyone with any ideas is welcome to comment, cuss or
discuss. I am not an EE, and am open to any and all feedback.
Thanks,
Dave