[Elecraft] K3, KPA500, KAT500 interactiions

[Dick Dievendorff]

When you start transmitting, the KAT500 detects high SWR and interrupts the
amplifier key line as a prelude to tuning. However that takes a little time.
In the time that it takes the KAT500 to break the amp key line, the KPA500
may observe high SWR briefly.  It engages its attenuator and flickers the
Fault LED (but this is not a fault that requires reset).  If the high SWR
persists, the KPA500 will fault.  But the KAT500 should break the amplifier
key line promptly, before the KPA500 faults, if it is allowed to do so.

I suspect you may not have configured the KAT500 to break the amplifier key
line when transmitting.  In the KAT500 Utility, Configuration Tab, Edit
Configuration, Amplifier Key Interrupt Power, click the button that says
"optimize for KPA500".

Some amplifiers, particularly those with frame relays, cannot tolerate
having the amplifier key line hotswitched with RF present.  So the KAT500
has to wait for a pause in transmission before it can interrupt the amp key
line.  

73 de Dick, K6KR


-----Original Message-----
From: elecraft-bounces at mailman.qth.net
[mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Bill Wiehe
Sent: Saturday, March 16, 2013 7:31 PM
To: elecraft at mailman.qth.net
Subject: [Elecraft] K3, KPA500, KAT500 interactiions

I must be having a senior moment so bear with me. If the KPA500 is "not
keyed" (K6KR) and/or it is "inhibited" (AC7AC) while the KAT500 is tuning,
why am I getting a "fault" that requires a manual reset?
BTW I am using the cabling as described in figure 1 on page 4 in the
KAT500 owners manual with the correct DB15 cables and, in the interest of
full disclosure, I do use the KPAK3AUX Y cable at the K3 ACC port.
Bill - W0BBI
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