Don et al,
On occasion the signal that the amp goes into Operate mode is not passed
along (or received, I don't know which), which means that the K3 will
operate at higher than required drive level, for a moment only because
the KPA500 will fault VERY quickly protecting everything.
However, I am unable to come up with a viable pair of suspenders, so I
simply try to be more aware when the amp goes hot.
The reverse can be true too; the K3 thinks the amp is still in operate
(but it isn't) and transmits at lower than expected output.
Yes, I've dis/reconnected the cables, made sure they're snugged in; it's
not repeatable, it's random. I do use the two cables (6') which is the
max allowed between the K3 and KPA, which may also be part of the
cause. (Moving it all into a new shack over the next few days, that
cable length will no longer be required.)
Rick NK7I
On 3/5/2020 2:38 PM, Don Wilhelm wrote:
Curiosity is getting the best of me --
If the built-in protection works well, why do you need more protection?
If the belt works OK, then why add suspenders as well?
If you are operating a K3 or K3S, there is a per band power level that
can be used. It will automatically use the settings for the amplifier
when the KPA500 is set to operate. That can be considered your 2nd
level of protection and it guards against "fumble fingers"
73,
Don W3FPR
On 3/5/2020 2:35 PM, Tony wrote:
All:
I'd like to avoid the inevitable situation where one mistakenly
transmits too much power into an amplifier. I have a KPA500 and the
protection circuit works well, but I was wondering what can be done
to add an extra layer of protection?
Tony
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