KPA500 fault

[Len Chesler-2]

I am enjoying my new KPA500 coupled with my K3, and I have set up the K3 to transmit at approximately 25 watts in the  "operate" position on all bands except 30 meters. However, if the amplifier menu is set to default to "operate" mode upon KPA500 initialization,  I  experience an immediate overdrive fault on the amplifier which tells me that the amplifier is not immediately sensing the lower power output setting on the K3.    I have temporarily remedied this situation by setting the KPA500 menu to default to "stby" mode upon turn on, and then when I manually switch to "oper" mode, I do not experience the overdrive fault .  It would be more convenient  to have the amplifier default to the operational state, as designed.  I am curious if anyone else is experiencing this situation??


 

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[Richard Squire - HB9ANM]

Hi Len

My KPA500 is normally set to PWR ON = STBY, which is the factory default setting.
But after setting it  to OPER for a test,  I noticed the same thing.
I suspect this is a timing issue, just like leaving the K3 at low power on band change if BAND CHG is set to STBY.
The next FW release is supposed to solve the problem. Some hams (field testers?) seem to have FW 1.11 (which is not even Beta yet) but most still use 1.02.

Let's wait and see...

73
Richard - HB9ANM

Len Chesler-2 wrote

However, if the amplifier menu is set to default to "operate" mode upon KPA500 initialization,  I  experience an immediate overdrive fault on the amplifier which tells me that the amplifier is not immediately sensing the lower power output setting on the K3.

[John E. Reiser]

Hi Len,

I think KPA500 FW 4.11 will fix this and similar issues  You can request the
pre-beta by sending an e-mail to [hidden email].

73,  John, W2GW


----- Original Message -----
From: "Richard Squire - HB9ANM" <[hidden email]>
To: <[hidden email]>
Sent: Saturday, August 27, 2011 5:07 AM
Subject: Re: [Elecraft] KPA500 fault

> Hi Len
>
> My KPA500 is normally set to PWR ON = STBY, which is the factory default
> setting.
> But after setting it  to OPER for a test,  I noticed the same thing.
> I suspect this is a timing issue, just like leaving the K3 at low power on
> band change if BAND CHG is set to STBY.
> The next FW release is supposed to solve the problem. Some hams (field
> testers?) seem to have FW 1.11 (which is not even Beta yet) but most still
> use 1.02.
>
> Let's wait and see...
>
> 73
> Richard - HB9ANM
>
> Len Chesler-2 wrote:
>>
>> However, if the amplifier menu is set to default to "operate" mode upon
>> KPA500 initialization,  I  experience an immediate overdrive fault on the
>> amplifier which tells me that the amplifier is not immediately sensing
>> the
>> lower power output setting on the K3.
>>
>>
>
>
> -----
> Richard - HB9ANM
> --
> View this message in context:
> http://elecraft.365791.n2.nabble.com/KPA500-fault-tp6731485p6731711.html
> Sent from the Elecraft mailing list archive at Nabble.com.
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
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>
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> Please help support this email list: http://www.qsl.net/donate.html
>

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