IMHO adapting amplifier to work with KAT500 is not the right way of doing it
because KAT500 is supposed to work with many different amps of 600 watt
class.
Yes, PTT is generated by the radio and then passed to KAT500. KAT500 should
generate it's own PTT signal for PA based on it's own KAT500 status and
incoming PTT signal from the radio. If incoming PTT is present and antenna
is matched then KAT500 generates PTT for the amp. This will create
additional delay equal to switching time of KAT500 relays (minimum) plus
some time required to analyze frequency and bring KAT500 to matching state.
That is the price to pay for use of the automatic tuner.
This will exclude PA faults and relays hot switching in KAT500.
But then this feature can be user selectable. If you do not need it just do
not use it.
The question remains, is it possible to do it all in the firmware or
hardware mods will be required.
73, Igor UA9CDC
----- Original Message -----
From: "ke9uw" <c-haw...@illinois.edu>
To: <elecraft@mailman.qth.net>
Sent: Saturday, December 08, 2012 6:18 PM
Subject: Re: [Elecraft] [KAT500] Help with KeyLine Interrupt on
KPA500(Video)
The PTT is generated by the transceiver. The KAT500 passes it thru to the
amp
unless the KAT is tuning a high SWR. The problem is that the amp goes into
fault before the KAT can OPEN the key line. Firmware in the KAT with some
delay is not the answer...it's already too slow for the amp. If there is
any
programmable delay in the KAT, then a firmware change might be to speed
that
up if possible. But I doubt that it is possible since it's a relay opening
in the KAT which requires some milliseconds.
I'm guessing the only Elecraft solution is to delay the amp's response to
the high SWR so it doesn't "Fault" giving the KAT time to open the key
line.
So the change in firmware we are waiting on is for the KPA amp.
Help me if I'm missing something here.
-----
Chuck, KE9UW
--
View this message in context:
http://elecraft.365791.n2.nabble.com/KAT500-Help-with-KeyLine-Interrupt-on-KPA500-Video-tp7566844p7566890.html
Sent from the Elecraft mailing list archive at Nabble.com.
______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft@mailman.qth.net
This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft@mailman.qth.net
This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
