[Elecraft] KPA500 STBY to OPER

[Rick WA6NHC]

Close but no.

With the amp in standby, the power out up to 100 W is determined by the 
power setting (knob) on the K3.

With the amp in operate, the (reduced drive) power is determined by the 
power setting on the K3; best if the 'Set by band' feature is used (the 
amount of drive for the desired output varies according to the band in use).

You use the _same_ knob for operate/standby, it remembers.  It can't be 
simpler.

Rick NHC


On 9/2/2019 7:45 AM, Bob McGraw K4TAX wrote:
> Andy et al:
>
> With the station configured as shown in the KAT500 manual, page 5 
> Figure 1, when operating a digital mode or any mode for that matter, 
> and the amp is in STBY the K3S is delivering the power as set by the 
> PWR control.    Normally 100 watts.   When the KPA500 is then switched 
> to OPER the PWR on the K3S is set to the value as defined in the PWR 
> SET menu.    Typically 20 watts drives the KPA500 to 400 to 500 watts 
> output.   Thus there are 2 sets of per band power settings, one for 
> barefoot operation and one for use with the amp.
>
> As to how well it works, I'd say 100% as I have observed no 
> mis-operation or fault indication in the 2 years of using the station 
> on a daily basis.
>
> 73
>
> Bob, K4TAX
>
> On 9/2/2019 8:58 AM, Andy Durbin wrote:
>> "With my K3S, when I switch the KPA500 to Operate, the transceiver is 
>> automatically reduced to the correct power to drive the amp."
>>
>> Bob,
>>
>> I'm curious to know how well that feature works.  Let's say your 
>> KPA500 is STBY, your K3 is set to 100 W out, and you are transmitting 
>> in a digital mode.  What happens when you switch the KPA500 to OPER?
>>
>> If you don't know the answer please don't it!
>>
>> My  controller ensures that the KAT500 key line is inhibited when the 
>> KPA500 is in STBY.  When the KPA500 goes to OPER I set appropriate 
>> exciter power, and only when correct power has been verified do I 
>> enable the key line.  If I'm transmitting at 100W with KPA500 in STBY 
>> then selecting OPER gives a brief power reduction before establishing 
>> high power output.
>>
>> 73,
>> Andy k3wyc
>
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