[Elecraft] Extra Protection For KPA500?

[David Box]

Well there is one exception to the idiot-proofing and that occurrs if 
you use macros that have the PCxxx command in them for setting power.  
Under certain conditions if a PCxxx command is used in a macro it can 
overide the CONFIG:PWR SET Per bAnd setting.  I have removed all PCxxx 
commands from my macros until I understand this completely and have 
tested each macro.

I got the following from Elecraft Support and have been testing each 
macro to determine if the PCxxx command creates a problem. Nothing 
replaces the Mark1 eyeball to verify,

de Dave K5MWR

Power Set/Per Band is activated at the time of a band change. If your 
macro runs after the band change, the macro dominates--and vice versa. 
(The last one rules, in other words). Similarly, if the amplifier 
changes from STBY to OPER after the macro runs, the power will change to 
the stored OPER power level.

Note that it is likely that if your macro sets a power level, that level 
will become the new default power for either the K3's STBY or OPER 
transmit level, depending upon which mode the K3/amplifier is at the 
time the macro runs. To use even more words (hi), if the amp is in OPER 
on 20m and you run a macro setting TX power to 75W, that will be the 
stored power level--whether you transmit or not. The next time the K3 is 
on 20m and the amplifier is switched to OPER mode, the K3 will return to 
that last-used AMP = OPER mode power level of 75 W. (And the amp will 
throw an overdrive fault when you transmit).



On 3/8/2020 16:06, k2te at juno.com wrote:
> Having followed this thread, I can heartily endorse Elecraft's method of
> idiot-proofing K3 power control when used with the KPA500.  I have tuned
> each band for maximum output (except 200W on 30 meters per regulations).
> When the amp is in standby and I key the K3, I see the output level on
> the amp's display.  When switching to operate, I get the prescribed
> amplifier output.  A momentary touch of the K3 PWR knob shows the drive
> level (17 - 25 watts, band-dependent).  Technology has finally found a
> way to minimize blown amps during the wee hours of a contest!
>
> 73 de Ed
>
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