[Elecraft] * on KPA-500

[Ron D'Eau Claire]

There are times when you absolutely do not want the amp to amplify even
though RF is applied. One, for example, is when using an external ATU like
the KAT500. You don't want the amplifier putting out full power when it does
a tune operation to reduce the SWR. That would damage both the tuner and the
amp. So the tuner opens that key line, inhibiting the amp, while until the
tuning operation is completed. 

Most amps provide a key line to inhibit it for just that reason. Of course,
you could manually put the amp in "standby" at such times, but the demand
today is for almost "one button" operation that protects the equipment
almost no matter what the operator does, Hi! 

73 Ron AC7AC

P.S. Bet you got inundated with off-list replies. That is the pain of
replying and not copying the list - it generates a huge amount of
non-essential traffic because no one can see that the question was already
answered. And, of course, if someone accidentally provides the *wrong*
answer, no one knows it. The list is an excellent peer review. 



-----Original Message-----
From: elecraft-bounces at mailman.qth.net
[mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Ken Nicely
Sent: Saturday, March 16, 2013 9:07 AM
To: elecraft
Subject: Re: [Elecraft] * on KPA-500

Thanks for all the replies.

I am testing using the KX3 with the amp and tuner to see if it would work
without a key line.  It seemed to me that the amp should be able to rf sense
the key down state.  But I noticed that after  the tuner tuned the signal
was attenuated and the amp had the *.  Of course the signal was
attenuated because the amp was in transmit.   I just had never notice the *
in transmit before.

Ken  KE3C

On Sat, Mar 16, 2013 at 11:53 AM, Geoffrey Downs <gdowns68 at gmail.com> wrote:

> Page 9 of the manual, the paragraph numbered 2.
>
> 73
>
> Geoff
> G3UCK
>
> -----Original Message----- From: Ken Nicely Sent: Saturday, March 16, 
> 2013
> 3:12 PM To: elecraft Subject: [Elecraft] * on KPA-500 What does the * 
> on the left side of the KPA-500 mean?  I have been looking for this in 
> the manual and can not find any mention of it.
>
> Ken KE3C
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