[Elecraft] KPA-1500 questions and low pass filters

[Peter W2IRT]

Hi all,
Just got my 1500 connected last night and so far so good. I do have two
questions, however. First, is it possible to toggle standby and operate from the
K3s, instead of using either the remote software or physically pressing the
button on the amp? And second, I was under the impression that there was a way
to have separate transmitter powers depending on whether the amp is inline or
not. I normally like to run the full 100W from the K3s, but when I kick the amp
in, I have to drop TX power to ~25 Watts.

Another issue I have involves the feed path. I am using a remote antenna switch
mounted at the tower. At the moment I have all my HF antennas connected through
there, using the Antenna 1 port on the amp (previously on the K3s). Antenna 2 is
for 6m only. I would like to route the 6m antenna from this switchbox as well,
but the problem is the HF output is running through a low-pass filter. Are there
low-pass filters that don't cut off until ~54 MHz?

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Regards,
Peter Dougherty