Hi Eric
Thanks for the email.
It's not a problem..... really. In fact
I'm now seriously thinking of buying a 2nd kpa500 amp for SO2R!
Cheers
Ken..G0ORH
Sent from my iPhone
On 3 Aug 2011, at 16:55, "Eric Swartz - WA6HHQ, Elecraft" <[email protected]>
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
>
> ---
> www.elecraft.com
>
>
> On 8/3/2011 1:09 AM, Ken Chandler wrote:
>> Hi
>> I took part in IOTA contest at the weekend in the unassisted category, CW,
>> high power.
>> The KPA-500 was used for the first full 24hrs contest here with M3i
>> call-sign and I did give it a darn good work-out end result performance was
>> just fab.
>> No hang-ups, instant power, band change, big pile-ups lots of QSO's LOTS of
>> fun.
>> It just loofed along, the fan came on occasionally but was not loud, my PC's
>> fan is louder than the amp.
>> HOWEVER
>> after the contest, pc switched off, k3 on, amp still on in standby mode,
>> Their is a HUM from the amp and was fairly noticeable.
>> Turning off the rear switch cured it!!!
>> Perhaps one for the engineers to look at, as I'm sure they will, and are
>> already on the case!!!!
>>
>> Ken..G0ORH / M3i KPA-500 sn 212
>>
>> Sent from my iPhone
>>
>>
>>
>>
>>
>> On 3 Aug 2011, at 07:08, Klaus Koppendorfer<[email protected]> wrote:
>>
>>> discussion is drifting away to amplified speakers but there is realy a
>>> problem with
>>> HUM comming from KPA500
>>>
>>> 1) HUM during transmit
>>> 2) HUM somes sometimes when the KPA500 is off, but on line and backswitch on
>>>
>>>
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