When I read in the manual where it says "never exceed 40 watts" that
leads me to believe one should not do that. While the protection
circuit is fast and there is a 3 dB attenuator that switches in
automatically, from 100 watts down 3 dB is still over 40 watts. I think
I read here where someone hit the amp with 100 to 200 watts and now it
needs repair. In other words, "they let the smoke out of the box".
As to ALC, that is in my opinion and option and does not require the
company to supply a cable or diagram. After all, what connector type
for "other radio" is required? And in many cases, mine for one of my
radios, there is NO ALC input. Thus I must BE VERY CAREFUL when I
use that radio with my KPA500. As to using ALC, since your IC-7300
does have provision for external ALC, my suggestion is USE IT!. Page 17
in the manual "Using ALC" is quite clear about this. And for what it's
worth, with my K3S, I do have the ALC interfaced from the amp to the
radio. Just in case something goes amiss. With my radio that does not
have ALC input, I must be careful to set the power correctly and then
CHECK and RECHECK to see all is done correctly before transmitting.
My KPA500 is in line in all station configurations and operation. Two
transceivers, 160M - 6M. I find no need to physically or externally
switch it out of line.
73
Bob, K4TAX
On 2/28/2019 12:07 PM, Jim Lageson wrote:
I have never owned an amp before and recently put together a KPA500. All
seems to be working well, but I have a few questions. I am using with a
IC-7300.
How important is the ALC cable? I notice it is not included in the Basic
Cabling Diagram in the manual but is discussed later in the manual.
If I were accidently to run 100 watts into the KPA500 will the PWRIN HI
Hard Fault/STBY protect itself before any damage is done. Would ALC protect
me from that?
Is it standard procedure to keep the KPA500 in line when turned off and not
in use? I see you may run up to 200 through the KPA500 in STBY.
Is there any concerns or settings on radio when running full break in on CW?
Thanks
Jim-N0UR
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