Re: KPA1500 Operation on 6 Meters

Posted by Elecraft mailing list on Jun 16, 2020; 12:48am
URL: http://elecraft.85.s1.nabble.com/KPA1500-Operation-on-6-Meters-tp7662211p7662262.html

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 <[hidden email]> 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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