|[AMRadio] Stock or modify? BC rig "value" -- Shorting Sticks|
acohen at texas.net
Thu Jun 1 16:05:03 EDT 2006
I've seen sticks that were anywhere from a bit over a foot to three
feet long. As far as material choice, even a good wooden broomstick
or dowel seems like a good bet, because the business end is well
BTW, I didn't mean to come on so strong in the original post. It's
just that I'm obviously a strong believer on this one point. The
other precautions about switches, meters and so forth are very
important, but none of them are fool proof. The shorting stick is
just a very important fail safe.
On Jun 1, 2006, at 3:37 PM, Rick Brashear wrote:
> Speaking of "shorting sticks", I saw one a while back on the e-
> place, but didn't seriously bid on it. Can one of you guys
> enlighten me as to the best material to use for the insulator and
> about how long to make it?
>> Not only is a shorting stick not a bad idea, not using one is a
>> terrible idea. As someone who has spent many hours working on
>> high power transmitters, I would NEVER touch anything inside a
>> transmitter without first touching it with a shorting stick.
>> When I do not have a proper shorting stick available, I connect a
>> grounded wire to a well insulated screw driver and use that as a
>> makeshift shorting stick. There is are no allowable exceptions
>> to the shorting stick rule, as far as I am concerned.
>> Never rely on meters, pilot lamps or switch positions to tell you
>> if HV is present. Switches can short and pilot lights can burn
>> out. I've seen at least one high power uplink amplifier where
>> the designers used the bleeder resistor as part of the meter
>> multiplier string. An open bleeder meant zero HV on the meter
>> but possibly a full charge on the filter caps. In that situation
>> a shorting stick could be the difference between life and death.
>> Never, ever, touch anything inside of a high power transmitter
>> without using a stick. Period!
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