[Elecraft] new KPA 500 question

[Vic K2VCO]

This will depend on the input relay or other switching circuit used in the Commander. Some 
QSK circuits use a small reed relay in the input and a vacuum relay for the output. In 
that case it's possible that 500-600w from the KPA500 will be too much for it. Others use 
a pair of vacuum relays, which would not be a problem. It may also use a single large 
open-frame relay, which would also be OK (although not QSK). Or it might have a PIN diode 
switch, in which case it would depend on the details of the circuit.

I think the best thing for you to do is to call Command Technologies and ask them about 
your particular model and serial number.

On 12/18/2012 9:44 AM, Bruce McLaughlin wrote:
> I finally succumbed to temptation and ordered a KPA 500 which will arrive
> tomorrow.  This may be a question that can't be answered on this reflector
> but I thought I would try.  I have an HF 2500 Commander, the Palstar
> version, which I have been using with the k3 and other radios.  I am not
> sure about how I will integrate the KPA 500 into the station.  I have been
> switching between three different radios and the Commander amplifier using a
> coax switch to switch the output of the various radios to the input of the
> Commander.  I have been thinking about pulling the output of the k3, running
> it through the KPA 500 and then running the output of the KPA 500 to the
> coax switch.  With that arrangement the switching would be exactly the same
> as before.
>
> However, I am a little concerned about running 500 Watts into the input Of
> the Commander even when that amplifier is turned off.  I am wondering
> whether that might damage the input circuits Of the Commander.  Does anyone
> have any suggestions.  I should mention That the Commander works just fine
> with all of the radios but I wanted to complete the K line and experience
> integrated, completely automatic operation.  The lower power from the KPA
> 500 should not make any significant difference for most contacts.  I would
> appreciate any thoughts on the subject.
>
> Bruce-W8FU
>
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-- 
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco/