I don't agree,...
Any issue between the LP-100A and KPA1500 is extremely unlikely, and any
issue in the antenna system would reflect on both LP-100A and KPA-1500
swr indications.
I find the LP-100A consistent readings at all drive levels discounts the
antenna system thereafter as a cause.
On 16/6/20 10:48 am, Jack Brindle wrote:
That means that he needs to check the connectors, adapters and cable that run
from the KPA500 to the LPA-100 and potentially the LP-100A itself.
The directional coupler is the last component in the KPA500 chain. For
reflected power, it simply reports the conditions it sees from the antenna
connector out.
That means the connectors, adapters and cable that follow it. Especially look
at any adapters, they are notorious (especially right-angle adapters) for
failing at hight power.
This is a problem that many have seen, and is always an issue in the antenna
system. Jim’s advice is spot-on here.
73!
Jack, W6FB
On Jun 15, 2020, at 4:46 PM, Adrian <[email protected]> wrote:
Did you see this part in Ed's earlier post ;
"
An LP-100A on the output of the KPA1500 is also used and displays the correct low
SWR at all drive levels that I would expect to be seeing on the KPA1500
display."
This would also should any power breakdown, but it doesn't ?
Adrian Fewster
On 16/6/20 6:30 am, Jim Brown wrote:
On 6/15/2020 6:48 AM, Ed G wrote:
When setting the power output of my K3 to give varying amounts of drive to
the KPA1500, I am seeing SWR as displayed on the KPA1500 changing by a
significant amount depending on the drive level.
Look for something breaking down in your antenna system or between the power
amp and the antenna. High power has a way of finding weaknesses that low power
lives with.
73, Jim K9YC
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