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   Home   Help Search  
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Author Topic: Higher SWR on amp than tuner  (Read 4602 times)
K6AER
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Posts: 5723




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« Reply #15 on: July 31, 2017, 01:46:40 PM »


And anyone who pays $150,000.00 for a car needs their head examined.

On 18.136MHz phone after 2200UTC.

Kraus

I would guess you don't have a pilots license.
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WB8VLC
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Posts: 635




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« Reply #16 on: July 31, 2017, 08:39:06 PM »

It appears to be Common mode issue as others say,

 I have the same amp but with the k3s both brand new and I had the same problem, any of the popular common mode solutions should resolve the issue.

A good wide copper ground buss with everything tied together should resolve the problem but if you already have a similar grounding point buss and still have some frequent issues then wrap 3 or 4 turns of the coax connecting from the kpa500 output to the tuner around a large sized toroid core.

The above 2 methods also resolved frequent PC USB interference in my installation.

Forgot, the core used was a stack of two FT-240 cores around , 52MIX If my memory is correct.



« Last Edit: July 31, 2017, 08:53:52 PM by WB8VLC » Logged
N1KB
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Posts: 9


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« Reply #17 on: August 11, 2017, 05:37:43 PM »

My signal is getting out just fine.  I'm not having troubles.  I just want to learn.  Thank you all.
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N1KB
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« Reply #18 on: August 17, 2017, 05:55:08 PM »

Thank you WB8VLC!  Very useful post.  I will work on this.

Thanks,
N1KB
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N1KB
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« Reply #19 on: August 25, 2017, 05:58:45 PM »

I installed a Palomar CMNF-2 Common Mode Coax Noise Filter and SWR now "normal" on amp and transceiver.

Thank you.
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