>
>> I think that what he is saying is that he is shocked to see that on
>> stand-by only the keying relay is disabled and the HT is NOT switched off.
>> I would think that in stand-by a good amp should be just loafing with the
>> HT removed (or at least reduced), etc.
>>
>> 73, Carl VE9OV
>
>OK, I didn't really follow his line of thinking.
>
>It came off as "what a silly mistake" and my reaction is thinking a
>standby switch makes the PA safe sure is!
>
> What he was basing his statement on was the fact that military
>equipment disable HV when on standby.
>
>Even considering that, I can't imagine why anyone would depend
>on a standby switch to make an amplifier safe!
>
Bad logic unit?
>But here are the two main reasons that isn't done:
>
>1.) The AL80B, as with many other amplifiers, shares a common
>filament and plate transformer. There is no way to remove HV with
>the standby switch.
>
>2.) Hams frequently turn the standby switch off and on while still
>operating, to reduce power or bypass the amplifier. Commercial
>stations generally do not place PA's in-line and out-of-line while
>using the station.
>
>Common sense dictates NEVER removing the cover and
>connecting the PA to the mains.
>
>Common sense dictates NEVER working on any PA where you
>depend on a front panel switch for your personal safety.
>
>Sometimes we get sloppy and need to be reminded of that!
>
>
One of the first hams to install a low VHF Q parasitic suppressor
retrofit kit was electrocuted because he did not pull the electric mains
plug. As I recall, his call sign was W5DH. He was in his 80s.
- Rich..., 805.386.3734, www.vcnet.com/measures.
end
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