[Elecraft] KPA-500 HUM

[Eric Swartz - WA6HHQ, Elecraft]

One clarification to my last post.

It is important that users power off the KPA500 using the front panel 
power switch before killing power with the rear panel switch.

If you only use the rear panel power switch for main power then any 
changed parameters (including last band) will not be saved at power off.

73, Eric  WA6HHQ

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www.elecraft.com


On 8/3/2011 8:55 AM, Eric Swartz - WA6HHQ, Elecraft wrote:
> When the back panel switch is on, the low voltage power supply for the
> front panel is still on, allowing the microprocessor to read the front
> panel 'power' switch and talk over RS-232. A low level of power supply
> hum from this small transformer is totally normal in this case. Of
> course, turnig off the rear switch on the KPA500 shuts down everyhting.
> Its perfectly OK to use the rear switch as the main on/off power control.
>
> The KPA500 front panel power switch is a 'soft' switch that controls the
> HV supply relay etc. This allows remote control over RS-232 to power
> up/down the amp etc.
>
> 73, Eric   WA6HHQ