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Author Topic: Lower out put on 40 meters sb-200  (Read 1240 times)
VE7SHM
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Posts: 52




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« on: April 20, 2013, 08:24:17 PM »

I have noticed my amp will make 700 watts on 80 meter and 650 on 20 but on 40 i only get 500 i am not overly concerned just curious ..And i am using 70 watts for drive   
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K8AXW
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Posts: 4002




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« Reply #1 on: April 20, 2013, 09:12:18 PM »

Have you checked the input SWR on 40m?  Maybe one or more of the caps in the input pi-net has shifted in value or even given it up.

Or it could simply need the slug adjusted to give you a better match to your exciter. (which will improve the input SWR)

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VE7SHM
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Posts: 52




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« Reply #2 on: April 21, 2013, 09:19:35 AM »

I am using a ic 718 in to a LDG IT-100 to my amp then my HK sa2060 tuner to ant ....typical swr on 40 is 1.5.1 at the radio with amp on all bands
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K8AXW
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« Reply #3 on: April 21, 2013, 06:04:24 PM »

Then the next question I have to ask is, what are your meter readings when you get this "low output" on 40m?

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VE7SHM
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Posts: 52




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« Reply #4 on: April 29, 2013, 03:59:45 PM »

All fixed got rid of my old watt meter and bought a good one LP-100A Digital Vector Wattmeter i get 600 watts with about 70 in ..........thanks
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