Drive KPA500 with either K3s or KX3 keying question

[Elecraft mailing list]

Prior to receiving my KAT500 I have routinely connected my K3S to the KPA500 via the AUX cable and the KX3 keying output to the PA KEY jack via an RCA to RCA cable at the same time.  The RF input from the K3S or the KX3 goes through a two position coax switch.  Having both connected at the same time has not seemed to cause any identifiable problem in going back and forth between the two driving transceivers.

The question is may I make the same connections through the KAT500, the K3S connected through the KAT500 via AUX cables and the KX3 connected to the KAT500 via the PTT RLY connections.  It appears that the internal inhibit relay opens both lines when an interrupt is necessary and that other than that the two connections are in parallel.

Very 73 - Mike - K9JRI






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[Bob McGraw - K4TAX]

In running my KPA500 on FT-8 mode at about 400 watts output, what is the
recommended setting for Fan CTL?    I usually keep it in NORmal but have
tried other settings.  I watch the TEMP and see that it gets above
65ºC.   The fan speed increments up and down as the temperature changes
accordingly.  All appears norms.    But, do you find setting the Fan CTL
to some value is more efficient in regard to cooling?

Thanks in advance for your inputs.

73
Bob, K4TAX

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[Jim Brown-10]

On 7/3/2018 6:24 AM, Bob McGraw K4TAX wrote:
> In running my KPA500 on FT-8 mode at about 400 watts output, what is
> the recommended setting for Fan CTL?    I usually keep it in NORmal
> but have tried other settings.

Nearly all of my FT8 operation is on 6M, where the KPA500 is least
efficient, and where my antenna looks like about 1.5:1 in the shack. I'm
running meteor scatter and weak signal work, which means I'm
transmitting on almost every cycle. To keep TEMP relatively low, I set
the fan to either max speed or one step down. Into a different antenna
on FD, the same amp ran significantly cooler. Using an LP100A power
meter, I get at least 500W out on 6M, sometimes as much as 550W.

73, Jim K9YC


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